Nitronic 50 / XM-19 / UNS S20910 Forging Parts | China Leading Manufacturer - Jiangsu Liangyi Jiangyin

Nitronic 50 forging parts (also known as Alloy 50, UNS S20910, or XM-19) are custom open‑die forgings and seamless rolled rings produced by Jiangsu Liangyi Co., Limited. Established in 1997, our forging factory is based in Chengchang Industry Park, Jiangyin City, Jiangsu Province, China. We hold ISO 9001:2015 certification, and our forgings are produced to meet API 6A and NACE MR 0175 material standards. Our products are exported to more than 50 countries around the world, and we manufacture forgings from 30 kg to 30,000 kg per piece for important industries such as oil and gas, nuclear power, petrochemical, marine, and aerospace.

Jiangsu Liangyi is a top China-based Nitronic 50 / XM-19 / UNS S20910 forging manufacturer and supplier with over 25 years of experience in the forging industry. Our modern factory is located in Chengchang Industry Park, Jiangyin City, Jiangsu Province, China. This strategic location gives us convenient access to top-tier steel mills, efficient logistics networks, and highly skilled manufacturing personnel.

We specialize in custom UNS S20910 open die forgings and seamless rolled rings that meet the material requirements of API 6A, ASTM, NACE MR 0175,and EN 10204. We offer a full range of service from steel melting, forging, heat treatment, machining, to quality inspection.

Our XM-19 forged parts (Nitronic 50 / XM-19 / UNS S20910) range from 30 kg to 30,000 kg and are exported to more than 50 countries around the world. They are used for oil and gas, nuclear power, petrochemical, marine, and aerospace industries. We are ISO 9001:2015 certified and will provide the highest quality products and services to all our customers around the world.

Nitronic 50 / XM-19 / UNS S20910 Forging — Quick Reference Facts

Material Names: Nitronic 50 = UNS S20910 = XM-19 = Alloy 50
Min. Yield Strength: 725 MPa (105,000 psi)
Min. Tensile Strength: 930 MPa (135,000 psi)
Magnetic Permeability: ≤ 1.002 (non-magnetic after cold work)
Max. Piece Weight: 30,000 kg
Ring OD Range: 500 mm to 6,000 mm
Bar Diameter Range: Ø20 mm to Ø2,000 mm
Starting Price: USD 3 per kg (final price depends on specification, quantity and machining requirements)
Lead Time: 4–6 weeks standard; 2 weeks expedited
Certifications: ISO 9001:2015, API 6A, NACE MR 0175, EN 10204 3.1/3.2
Machining Tolerance: ±0.01 mm (CNC finish machining)
Factory Location: Jiangyin City, Jiangsu Province, China
Export Markets: 50+ countries worldwide

UNS S20910 / Nitronic 50 Forged Round Bars - Jiangsu Liangyi China Manufacturer — UNS S20910 / XM-19 (Nitronic 50) Forged Round Bars — Jiangsu Liangyi, Jiangyin, China

XM-19 / UNS S20910 Seamless Rolled Rings (Nitronic 50) - Jiangsu Liangyi Jiangyin Factory — XM-19 / Nitronic 50 (UNS S20910) Seamless Rolled Rings — OD up to 6,000 mm, up to 30,000 kg

Get Your Free Nitronic 50 / XM-19 / UNS S20910 Forging Quote Today

What is Nitronic 50 / XM-19 / UNS S20910 Stainless Steel?

Nitronic® is a registered trademark of Cleveland-Cliffs Steel Corporation. Throughout this page, “Nitronic 50” is used as a widely adopted industry reference name for the alloy formally designated UNS S20910 / XM-19. Jiangsu Liangyi has no affiliation with Cleveland-Cliffs Steel Corporation.

Nitronic 50 — formally designated UNS S20910 and also known by the ASTM designation XM-19 — is a premium nitrogen-strengthened austenitic stainless steel originally developed by Armco Steel Corporation. All three names refer to the identical alloy. It offers an excellent combination of high strength, great corrosion resistance, and very low magnetic permeability. Compared to standard 300-series and 400-series stainless steels, UNS S20910 provides significantly better performance in harsh and corrosive environments.

the best things aboutXM-19 (Nitronic 50 / XM-19 / UNS S20910) is that it stays non-magnetic (permeability ≤ 1.002) even after a lot of cold working. So that it is the best material for uses where magnetic properties could cause problems or safety issues. Nitronic 50 / XM-19 / UNS S20910 has a high nitrogen content (0.20–0.40%), which makes it stronger and more resistant to corrosion. It doesn't need a lot of expensive alloying elements like nickel and molybdenum, so it's a good choice for many nickel-based superalloys.

Nitronic 50 / XM-19 / UNS S20910 vs Other Stainless Steels & Superalloys

Material Property Comparison: Nitronic 50 / XM-19 / UNS S20910 vs Common Alloys
Property	Nitronic 50 / XM-19 / UNS S20910	316 Stainless Steel	304 Stainless Steel	2205 Duplex SS	Inconel 625
0.2% Yield Strength (MPa)	725	205	205	450	450
Ultimate Tensile Strength (MPa)	930	515	515	620	827
Corrosion Resistance	Excellent	Good	Fair	Excellent	Outstanding
Magnetic Permeability	Very Low (≤1.002)	Low (increases with cold work)	Low (increases with cold work)	Magnetic	Very Low
Sour Service Resistance (NACE MR 0175)	Excellent	Fair	Poor	Good	Excellent
Cost (Relative to 316)	1.5×	1×	0.8×	1.2×	5×

Our UNS S20910 / XM-19 / Nitronic 50 Forging Product Capabilities

At our Jiangyin, Jiangsu manufacturing facility, we produce a full range of UNS S20910 / XM-19 / Nitronic 50 forged products in all kinds of shapes and sizes. Our advanced forging equipment includes 2000T to 6300T hydraulic presses, 1T to 9T electro-hydraulic hammers, and 1M to 5M seamless rolling machines, allowing us to handle projects of any scale.

UNS S20910 Forged Bars & Rods

Round bars: Ø20 mm to Ø2,000 mm
Square bars: 20×20 mm to 1,500×1,500 mm
Flat bars: 20×50 mm to 500×2,000 mm
Rectangular bars and step shafts
Gear shafts, crankshafts, and turbine shafts
Length up to 15 meters

XM-19 Seamless Rolled Rings

Outer diameter: 500 mm to 6,000 mm
Height: 50 mm to 1,500 mm
Wall thickness: 50 mm to 500 mm
Contoured and profiled rings
Gear rings, slewing bearing rings, and flange rings
Single-piece weight is up to 30,000 kg

Nitronic 50 / XM-19 / UNS S20910 Hollow Forgings

Sleeves, bushes, and bushings
Housings, shells, and casings
Pipes, tubes, and heavy-wall cylinders
Outer diameter up to 3,000 mm
Inner diameter as small as 50 mm
Heavy wall thickness options available

Other XM-19 / Nitronic 50 Components

Discs, plates, and blocks
Flanges and flanged blanks
Hubs, nozzles, and tube sheets
Valve bodies, balls, stems, and seat rings
Pump casings, impellers, and shafts
Custom machined parts based on customer drawings

✓ ISO 9001:2015 Certified

API 6A Material Requirements Met

NACE MR 0175 Material Standard

EN 10204 3.1 / 3.2 MTC Issued

25+ Years Experience

Exported to 50+ Countries

3 Verified Delivery Cases — Nitronic 50 / XM-19 / UNS S20910 Forgings

Three orders, three industries, three entirely different engineering challenges. We record every detail in full — including dimensions, root causes, and all inspection results — because this is the only way to tell a truly capable forging supplier apart from one that only claims to be.

Oil & Gas — Persian Gulf Offshore Platform

504 Wellhead Valve Bodies & Stems: Recovering a Fraud-Contaminated Supply Chain

What was ordered: 168 forged valve bodies, sized Ø285 mm × H210 mm with a 95 mm bore ID, rough‑machined to a tolerance of ±0.8 mm, along with 336 forged stems measuring Ø48 mm × L680 mm featuring a Ø38 mm stepped journal and M36×2 thread relief. All parts meet API 6A PSL3 and NACE MR 0175 Class EE standards. The as‑forged weight is 68 kg per valve body and 8.4 kg per stem, with a total order weight of approximately 21,000 kg. Delivery will be split: 50% of the order in Week 6, and the remaining balance in Week 10 to align with the platform installation schedule.

What went wrong before us: A Southeast Asian supplier had previously delivered 200 valve body forgings with documents claiming all parts meet UNS S20910. However, third-party spectroscopy testing at the Bahrain fabrication yard showed an average nitrogen content of only 0.14%, well below the needed minimum of 0.20%, and average chromium at 19.8%, below the 20.5% minimum specified. The material was actually 316L with falsified certification.The EPC contractor suffered an 11-week project delay and covered the full cost of re‑procurement. They then turned to Jiangsu Liangyi with one strict, non‑negotiable requirement: a complete, unbroken chemical verification chain from material melt to final shipment, one that could pass full regulatory audits — not just a simple PDF certificate.

A second, harder requirement: The wellhead instrumentation cluster used Hall-effect position sensors calibrated to trigger an alert for any permeability reading above 1.004 µr. Standard NACE and API 6A specifications permit magnetic permeability up to 1.010 µr. The customer needed a written commitment that all of the 336 stems would get ≤ 1.003 µr after machining. No other bidder was willing to sign this guarantee. We did — because our Förster Magnetoscop 1.069 permeameter and test data from over 60 previous Nitronic 50 / XM-19 / UNS S20910 stem orders gave us the statistical confidence to stand behind the guarantee.

How we closed both gaps:The EPC's metallurgist traveled to Jiangyin and supervised all four heats at our EAF and VOD furnaces. Spectrometer results were emailed within 2 hours after each pouring. For nitrogen content, we controlled it at 0.30–0.35% — well within the needed 0.20–0.40% range and far above the fraudulent level — by extending nitrogen injection time during the VOD process.
Post-machining magnetic permeability was recorded by serial number in our metrology lab. Every stem was individually tested on a Förster Magnetoscop, not just sampled inspection. The customer’s QC inspector was present for all permeability measurements and co-signed the inspection reports. The highest permeability reading among all 336 stems was only 1.0019 µr.

Inspection Record — Customer Witness at Jiangsu Liangyi Jiangyin Laboratory + EN 10204 3.2 MTC Issued
Check	Specified Limit	Actual — Worst Single Piece	Verdict
Nitrogen content (4 heats, spectrometer)	0.20 – 0.40 %	0.27 % (Heat 3, ingot-edge sample)	PASS
Chromium content	20.50 – 23.50 %	21.3 % (lowest recorded)	PASS
0.2 % Yield Strength	≥ 725 MPa	791 MPa	PASS
Charpy − 46 °C, transverse (API 6A Class LU)	≥ 20 J	61 J	PASS
Hardness	220 – 280 HB	248 HB	PASS
Stem magnetic permeability post-machining (100 %)	≤ 1.003 µ (project-specific)	1.0019 µ (highest of 336 stems)	PASS
UT per ASTM A388 — valve bodies, 100 %	No defect > FBH #3	No recordable indications	PASS
ASTM A262 Practice E (sensitisation check)	No step or dual structure	Fully ditched — acceptable	PASS

Outcome: Zero non-conformances were recorded across all 504 pieces. The EPC's resident inspector approved all results on-site at our Jiangyin facility.EN 10204 3.2 Mill Test Certificates were issued for each forging, including heat number, chemical composition, mechanical properties, heat treatment records, magnetic permeability data, and NDT reports. All certificates were countersigned by the customer’s authorized inspector prior to shipment.The platform was successfully commissioned according to the revised schedule.

Nuclear Power — EPR Reactor, France

Ball Valve Stems for Reactor Coolant Isolation: Six Questions That Defined the Order

This case is presented as the full sequence of technical questions raised by the customer’s nuclear safety engineer during a six-week qualification audit — along with Jiangsu Liangyi’s detailed responses to each inquiry.

Order scope: 96 ball valve stem forgings intended for Class 1 reactor coolant system isolation valves for an EPR unit under construction in Normandy, France.Stem dimensions: Ø62 mm × L820 mm, finish-machined with a Ø48 mm trunnion and Ø38 mm lower stem.Material meets RCC-M 2007 Edition M3306 requirements, equivalent to ASME SA-479 XM-19 plus additional French nuclear supplementary specifications.Total forged weight is3,840 kg. Customer: a Tier‑1 French valve OEM supplying the reactor island.
Inspection: the customer’s dedicated nuclear QA inspector was resident at our Jiangyin facility throughout the entire testing period. All test results were countersigned for issuance of EN 10204 3.2 Mill Test Certificates.

Q1: Can you prove the material is XM-19 and not 316LN substituted after solution annealing?

Our response and corresponding action:We used X-ray fluorescence to do positive material identification (PMI) on each stem, and we etched serial numbers on each one before the PMI test. The XRF reports showed that all 96 parts had niobium and vanadium, which are both required for UNS S20910 but not for 316LN. Confirming these two elements is the fastest and most reliable way to check that the alloy is correct during incoming inspection, since 316LN does not contain either of them.

Q2: What is the maximum magnetic permeability you can guarantee on the finished stem — including the trunnion after grinding?

This valve type’s electromagnetic actuator uses a Hall-effect position feedback coil around the trunnion. Permeability higher than 1.008 µr creates a 0.3–0.7° angular position error in the feedback signal, which exceeds the actuator’s calibrated tolerance.We guaranteed ≤ 1.005 µr on the finished ground trunnion OD surface — and the maximum measured value across all 96 stems after grinding was only 1.0033 µr.

Q3: The RCC-M supplement requires a minimum 30 % forging reduction ratio from a starting cross-section >4× the finished stem diameter. Can you certify this from ingot dimensions?

We used 200 mm × 200 mm continuously cast bar as the starting stock, with a cross-sectional area of 40,000 mm².This was drawn down to Ø68 mm, giving an area of 3,632 mm² — resulting in a reduction ratio of 11.0:1.This is far above both the required minimum starting ratio of 4:1 and the 30% minimum area reduction. The complete forging route card was included in the material dossier, with every intermediate dimension measured and recorded by our QC team.

Q4: Your solution annealing temperature must be confirmed traceable to a calibrated reference thermocouple, not the furnace control thermocouple. How do you handle this?

All ten of our heat treatment furnaces are equipped with independent calibrated Type K reference thermocouples, with calibration certificates traceable to national metrology standards and renewed every six months.For this order, the reference thermocouple recorded 1,077 °C ± 4 °C against the control setpoint of 1,080 °C.The 3‑hour soaking chart — showing control thermocouple, reference thermocouple, and load thermocouple readings — was included in the material dossier as a single consolidated PDF, with the furnace serial number watermarked on every page.

Q5: We require Charpy testing at − 60 °C per RCC-M supplement, transverse orientation, minimum 60 J average with no single value below 48 J. Most suppliers test longitudinal only. Can you do transverse?

Transverse Charpy V‑notch impact testing at −60 °C is more demanding than longitudinal testing, because the fibrous grain matrix aligned by forging reduction runs perpendicular to the notch. For Nitronic 50 / XM‑19 / UNS S20910, this requirement is still easily met when the forging reduction ratio exceeds 4:1 — and ours reached 11:1. Our transverse Charpy results show an average of 94 J and a minimum single value of 81 J, both of which are well above the specified requirement of 60 J average and 48 J minimum.

Q6: What is the lead time if we require a 4-week hold for our authorized QA representative witness at your facility before shipping?

We structured the schedule as follows: forging and heat treatment during Weeks 1–3; machining commencing in Week 4; finish machining from Weeks 5–7; all inspection completed and documented by Week 8; and the products held at our Jiangyin facility from Weeks 9–12 for the customer's authorized QA representative. The inspector arrived in Week 10, with the review finished in just 3 days, and the stems shipped in Week 12 with no impact to the overall schedule.

Final Acceptance Scorecard — Customer-Appointed Nuclear QA Inspector Witness at Jiangyin — EN 10204 3.2 MTC Issued

PMI (XRF, 100 % stems) — Nb and V confirmed present on all 96: ACCEPTED
0.2 % Yield Strength — needed≥ 725 MPa, achieved 774 MPa (worst stem): ACCEPTED
Tensile Strength — required ≥ 930 MPa, achieved 958 MPa: ACCEPTED
Charpy − 60 °C transverse (RCC-M) — needed 60 J avg / 48 J min, achieved 94 J avg / 81 J min: ACCEPTED
Hardness (HB, surface + mid-radius cross-section) — needed 220–280 HB, range 241–263 HB: ACCEPTED
Magnetic permeability, trunnion post-grinding (100 %) — needed ≤ 1.005 µ, maximum 1.0033 µ: ACCEPTED
UT per RCC-M MC3500 (100 %) — no indication ≥ 40 % DAC, none detected: ACCEPTED
PT (100 %) — no linear indication, none detected: ACCEPTED
Forging reduction ratio (document review) — needed ≥ 4:1 with ≥ 30 % area reduction, achieved 11.0:1 and 90.9 % reduction: ACCEPTED
Heat treatment chart traceability (reference TC) — 1,077 °C ± 4 °C over 3 h soak, all 96 pieces in same certified batch: ACCEPTED

All 96 stems passed the customer's nuclear QA inspector review with no corrective action requests whatsoever. EN 10204 3.2 Mill Test Certificates — including chemical composition, mechanical tests, forging route card, heat treatment charts with reference thermocouple traces, PMI records, UT and PT reports, and magnetic permeability logs — were compiled into an individual material dossier for each stem serial number and submitted to the customer's inspector for countersignature prior to crating. The valve OEM's QA team recognized this as the most complete and well-organized material dossier they had ever evaluated for a nuclear forging order.

Desalination — SWRO Plant, Red Sea Coast, Saudi Arabia

Centrifugal Pump Shafts: How Three Materials Failed Before XM-19 Succeeded

This case is presented as a chronological failure analysis — because the key engineering insight emerged from observing three different materials fail in sequence, in the same pump, under identical operating conditions. Each failure provided the water utility with distinct, actionable lessons.Nitronic 50 / XM‑19 / UNS S20910 performed successfully because it was chosen using all that accumulated knowledge, not despite the earlier failures.

Pump & Shaft Specifications Material: Nitronic 50 / XM-19 / UNS S20910
Quantity: 48 shafts (4 per pump × 12 units)
OD profile: Ø195 mm forged → Ø140 mm bearing lands / Ø120 mm impeller stack / Ø125 mm seal glands
Finished length: 3,080 mm
Slenderness L/D: 15.8 (slender shaft per API 610)
Operating speed: 3,560 rpm, 24/7 continuous
Discharge pressure: 83 bar (SWRO feed, 45,000 mg/L chloride at 38 °C)

Critical Tolerances Bearing land diameter: Ø140h5 (−0.000 / −0.016 mm)
Mechanical seal face Ra: ≤ 0.4 µm
Seal face runout TIR: ≤ 0.015 mm vs. bearing datum
Keyway corner radius: ≥ 1.6 mm (revised — see below)
Mid-span deflection under 14.2 kN radial load: ≤ 0.05 mm
Dynamic balance: ISO 1940 G1.0 (≤ 2.8 g·mm per plane)
Standard: API 610 11th Ed. + API 686 shaft alignment

The Timeline: Three Failures, One Root Cause Sequence

Months 0 – 16 | 316L Stainless Steel

The original 316L shafts developed pitting corrosion at the bearing sleeve seats. Stagnant SWRO brine trapped beneath the interference‑fit sleeve formed a crevice with locally depleted oxygen and chloride levels rising above 150,000 mg/L.At this concentration and 38 °C, 316L’s PREN value of 24 was insufficient. Pitting depth reached 0.4–0.6 mm within 14 months, creating fatigue initiation sites at the stress‑concentrated bearing locations.Average replacement interval: 16 months.Root cause: inadequate pitting corrosion resistance.

Months 16 – 38 | 2205 Duplex Stainless Steel

Duplex stainless steel (PREN ≈ 35) solved the pitting issue. However, the maintenance team did not adjust the keyway corner radius from the original 316L design, which was only 0.3 mm, resulting in a stress concentration factor Kt = 2.4.2205 duplex has a rotating bending fatigue endurance limit of about 260 MPa. Under impeller radial loads of 14.2 kN per stage and torsional load of 3.8 kN·m at best efficiency point (BEP), the calculated fatigue safety factor at the keyway root was 1.04 — marginally above 1 in theory. But real‑world surface roughness variations and minor corrosion at the keyway corners pushed the safety factor below 1.0.Cracks initiated at the keyway corners between 18 and 22 months. Average replacement interval: 22 months.Root cause: insufficient fatigue strength at a poorly optimized stress concentration detail.

Month 38 onward | Nitronic 50 / XM-19 / UNS S20910

After the second material failure, Jiangsu Liangyi was consulted. Before submitting a quotation, our rotating equipment engineer visited the pump station and inspected both the 316L pitting damage and the 2205 duplex fatigue fracture surfaces using a portable scanning electron microscope. The keyway corner was identified as the fatigue initiation point on every inspected 2205 shaft.
Our proposal included two critical improvements the utility had not previously considered:(1)Specify Nitronic 50 / XM‑19 / UNS S20910, which offers a PREN ≈ 34.2 and a fatigue endurance limit of approximately 380 MPa — 46% higher than 2205 duplex.
(2)Increase the keyway corner radius from 0.3 mm to 1.6 mm, lowering the stress concentration factor Kt from 2.4 to 1.75 and raising the fatigue safety factor from 1.04 to 2.26 with the new material. The utility approved both changes. The revised drawing was submitted to the customer’s engineering team and formally co‑signed as the official governing technical document.

One Manufacturing Problem We Had Not Anticipated

A 3080 mm shaft with an L/D ratio of 15.8 releases substantial residual stress after rough turning. If finish‑machined immediately, it can spring as much as 1.9 mm over its full length, making it impossible to hold the bearing seat tolerance of Ø140h5 (a 16 µm total band) on such a distorted shaft. We solved the problem by rough machining with stock that was more than 4 mm thick, stress relieving at 340 °C for 4 hours (verified below sensitization temperature using ASTM A262 Practice A coupon testing), laser straightening to 0.08 mm/m, and then finishing machining. This process added 9 days per batch of 12 shafts; though not included in the original quotation, we absorbed the extra cost rather than submitting a variation order, as the root cause was an internal production planning oversight on our part.

Acceptance Results — Customer Rotating Equipment Inspector Witness at Jiangyin Laboratory + EN 10204 3.2 MTC Issued

MATERIAL PROPERTIES

σ₀.₂: required ≥ 725 MPa → 758 MPa ✓
UTS: required ≥ 930 MPa → 962 MPa ✓
Fatigue endurance (R=−1, 10⁸): target ≥ 350 MPa → 388 MPa ✓
ASTM G48 pitting (72h, 6 % FeCl₃): no pits > 0.025 mm → no pits detected ✓

DIMENSIONAL & GEOMETRIC

Bearing land Ø140h5 (100 % shafts, CMM): all within Ø139.991–139.999 mm ✓
Seal face Ra (profilometer, 100 %): required ≤ 0.4 µm → 0.31 µm worst ✓
Seal face runout TIR (100 %): required ≤ 0.015 mm → 0.009 mm max ✓
Keyway radius (CMM, 10 % sample): required ≥ 1.6 mm → 1.72 mm min ✓

DYNAMIC & STRUCTURAL

Dynamic balance ISO 1940 G1.0 (Schenck HM30, 100 %): ≤ 2.8 g·mm → 1.4 g·mm worst plane ✓
Mid-span deflection under 14.2 kN (20 % sample, test rig): ≤ 0.05 mm → 0.032 mm max ✓
UT per ASTM A388 (100 %): no indication ≥ FBH #5 → no recordable indications ✓

Service record: These shafts have run nonstop at 3,560 rpm for 31 months across 12 pumps, with no failures or replacements needed at all. In the past, shafts made of 316L had to be replaced every 16 months, and duplex shafts lasted only 22 months on average. The water company now uses the same shaft design at a second pump station on the same site and placed an order for 36 more shafts in 2024.

Our Nitronic 50 / XM-19 / UNS S20910 Forging Process

At Jiangsu Liangyi, we follow a strict, integrated manufacturing process to make sure UNS S20910 / XM-19 / Nitronic 50 forgings have the highest quality .Our 80,000 m² production facility in Jiangyin, Jiangsu allows us to control every step from raw material selection to finished product delivery:

Raw Material Selection: We buy high-quality UNS S20910 (Nitronic 50 / XM-19) steel ingots from reputable Chinese and international mills with complete material traceability (heat number, chemical composition, mechanical properties).
Steel Melting & Refining: Our in-house steelmaking facilities include a 30t electric arc furnace (EAF), 30t ladle furnace (LF), and 30t vacuum oxygen decarburization (VOD) furnace to produce premium XM-19 / Nitronic 50 steel with low impurity levels.
Open Die Forging: we have advanced 2000T–6300T hydraulic presses and 1T–9T electro-hydraulic hammers for open die forging,and we can refine the grain matrix, get rid of internal flaws by controlling the temperature.we make Nitronic 50 / XM-19 / UNS S20910 stronger.
Heat Treatment: All UNS S20910 / XM-19 forgings can get the right strength, ductility, and resistance to corrosion after annealing and quenching . We have ten heat treatment furnaces, which makes sure all parts get the same amount of heat treatment by temperature control
CNC Machining: We can make Nitronic 50 or XM-19 with tolerances of up to ±0.01 mm based on customer drawings. We can do this by turning, milling, drilling, and grinding. We sell forgings that are either as-forged, rough machined, or finish machined.
Quality Inspection: We perform full testing on all UNS S20910 / Nitronic 50 / XM-19 forgings, including:
- Chemical composition analysis (spectrometer)
- Mechanical testing (tensile, impact, hardness)
- Non-destructive testing (UT, MT, PT, RT)
- Metallographic examination (grain size, inclusion content)
Packaging & Delivery: Products are carefully packaged in wooden crates, pallets, or custom packaging. We handle all international logistics, customs clearance, and documentation. Complete Mill Test Certificates (MTC) EN 10204 3.1 or 3.2 are provided with every shipment.

Chemical Composition of Nitronic 50 / XM-19 / UNS S20910

The chemical composition of Nitronic 50 / XM-19 / UNS S20910 is carefully controlled to make sure it has excellent mechanical properties and corrosion resistance. The table below shows the specified composition range per ASTM standards:

Nitronic 50 / XM-19 / UNS S20910 Chemical Composition — Weight %
Element	Minimum %	Maximum %
Carbon (C)	—	0.06
Manganese (Mn)	4.00	6.00
Sulphur (S)	—	0.025
Phosphorous (P)	—	0.025
Silicon (Si)	—	1.00
Chromium (Cr)	20.50	23.50
Nickel (Ni)	11.50	13.50
Molybdenum (Mo)	1.50	3.00
Nitrogen (N)	0.20	0.40
Columbium / Niobium (Nb)	0.10	0.30
Vanadium (V)	0.10	0.30
Iron (Fe)	Balance

Mechanical Properties of Nitronic 50 / XM-19 / UNS S20910 Forgings

All our Nitronic 50 / XM-19 / UNS S20910 forged parts undergo strict heat treatment and testing to make sure they meet or exceed the needed mechanical properties. The following are the minimum mechanical properties for UNS S20910 / XM-19 forgings in the solution annealed condition:

Nitronic 50 / XM-19 / UNS S20910 Minimum Mechanical Properties — Solution Annealed Condition
Property	Value
0.2% Yield Strength (Minimum)	105,000 psi (725 MPa)
Ultimate Tensile Strength (Minimum)	135,000 psi (930 MPa)
Elongation in 2" (Minimum)	20%
Reduction of Area (Minimum)	50%
Hardness (Typical)	220–280 HB
Magnetic Permeability (Maximum)	1.002

Impact Testing Requirements

All Nitronic 50 / XM-19 / UNS S20910 materials supplied by Jiangsu Liangyi are impact tested based on API 6A and ASTM A370 standards.The minimum average impact values are:

Transverse direction: 20 J (15 ft-lbf)
Longitudinal direction: 27 J (20 ft-lbf)

We test at temperatures set by material class in API 6A, from −60°C for Class K down to −18°C for Classes S, T, U and V. For XM-19 / UNS S20910 forgings, we can also do sub-size impact tests with correction factors as required by API 6A upon request.

Physical & Thermal Properties of Nitronic 50 / XM-19 / UNS S20910

Most suppliers only list yield strength and stop there. At Jiangsu Liangyi, our engineers always use the full set of physical properties when setting forging parameters. Properties like thermal conductivity and thermal expansion rate directly affect die cooling speed, bending during quenching, and final dimensional precision. The values in the table below come from actual tests on our solution‑annealed forgings, not just the minimum numbers from standard handbooks.

Physical & Thermal Properties — Nitronic 50 / XM-19 / UNS S20910 (Solution Annealed, 20°C Unless Noted)
Property	Nitronic 50 / XM-19 / UNS S20910	316L Stainless Steel	Engineering Significance
Density	7.88 g/cm³	8.00 g/cm³	1.5% lighter than 316L — marginal but relevant for rotating equipment weight budgets
Elastic Modulus (Young's Modulus)	197 GPa	193 GPa	Near-identical stiffness; existing deflection models for 316L translate directly
Thermal Conductivity (20°C)	12.5 W/(m·K)	16.3 W/(m·K)	23% lower than 316L — slower heat dissipation requires adjusted heat treatment soak times for thick-wall forgings; our 10 furnaces compensate with extended equalization holds
Coefficient of Thermal Expansion (20–100°C)	15.9 µm/(m·°C)	16.0 µm/(m·°C)	Virtually identical to 316L — no fitup surprises when mixing alloys in the same assembly
Specific Heat Capacity	502 J/(kg·K)	500 J/(kg·K)	Equivalent energy required for quenching calculations
Electrical Resistivity	0.86 µΩ·m	0.74 µΩ·m	16% higher resistivity — important for MRI-adjacent or eddy-current-sensitive installations
Magnetic Permeability (after 30% cold work)	≤ 1.005	1.2–2.0 (typical)	XM-19 stays effectively non-magnetic even after significant cold work; 316L does not

Why this matters for forging design: Nitronic 50 / XM-19 / UNS S20910 has lower thermal conductivity. For large forgings over 150 mm thick, we need to hold them at solution annealing temperature for at least one hour for every 25 mm of thickness before quenching.Our custom furnace loading process takes this into account. We set the hold time based on the thickest part of each batch, not the average thickness, to make sure the center of the forging is fully annealed.

Corrosion Resistance of Nitronic 50 / XM-19 / UNS S20910 — A Manufacturer's Field Analysis

The corrosion performance of Nitronic 50 / XM-19 / UNS S20910 is not just a matter of PREN numbers — it is the result of three independent mechanisms working together. Knowing all three factors is what makes the difference between choosing the right material and making a costly mistake in actual use.

1. Pitting Corrosion Resistance — The PREN Calculation

The Pitting Resistance Equivalent Number (PREN) predicts resistance to chloride-induced pitting. The formula is: PREN = %Cr + 3.3 × %Mo + 16 × %N. Using the mid-range composition of UNS S20910:

PREN = 22.0 + (3.3 × 2.25) + (16 × 0.30) = 22.0 + 7.4 + 4.8 = 34.2

By comparison, 316L has a PREN of about 24, 2205 Duplex around 35, and 2507 Super Duplex near 43.Nitronic 50 / XM-19 offers similar pitting resistance to standard 2205 Duplex at about half the cost, while staying fully austenitic and non‑magnetic.The nitrogen in the alloy alone adds 4.8 PREN points, which puts it much higher than 316L.

2. Stress Corrosion Cracking (SCC) — The Non-Magnetic Advantage

Standard 304 and 316 stainless steels often crack from chloride stress above 60°C.XM-19 / Nitronic 50 avoids this cracking in two key ways that most specs don’t cover together:First, its high nitrogen stops martensite from forming at crack tips, which is what makes cracks spread.Second, extra manganese keeps the material stable under stress, so it doesn’t change matrix like 316L does.In our Persian Gulf valve project with 500 parts running at 150°C and 690 bar, no stress cracking happened in four years — something 316L parts could never achieve in the same conditions.

3. Intergranular Corrosion Resistance — Why We Test to ASTM A262

Sensitization happens when chromium near grain boundaries is used up by carbide formation during welding or slow cooling. This hidden problem often causes stainless steel forgings to fail.Nitronic 50 / XM-19 has a maximum carbon level of 0.06%, and our internal standard is even lower at 0.04% or less — verified by spectrometer for every batch.At this carbon level, carbide buildup is very small, even when held in the sensitive temperature range of 425–870°C for 30 minutes.We test every production batch using ASTM A262 Practice E (oxalic acid etch) to confirm this, not just when customers ask for it.

Jiangsu Liangyi Corrosion Test Summary (Internal QC Data, 2022–2024):

ASTM A262 Practice E pass rate across all Nitronic 50 / XM-19 / UNS S20910 heats: 100%
Salt spray test (ASTM B117, 5% NaCl, 35°C, 500 hours): No pitting on any sample
Magnetic permeability check after solution annealing: All heats ≤ 1.002 µ

Heat Treatment Specifications for Nitronic 50 / XM-19 / UNS S20910 Forgings

Many forging suppliers keep their heat treatment process a secret. At Jiangsu Liangyi, we clearly show our full solution annealing parameters.We do this because customers who know what proper heat treatment should be can easily spot low-quality material from any supplier — including us.

Jiangsu Liangyi Standard Heat Treatment Parameters — Nitronic 50 / XM-19 / UNS S20910
Parameter	Specification	Why This Matters
Solution Annealing Temperature	1040°C – 1120°C	Below 1040°C leaves undissolved carbides and sigma phase; above 1120°C causes excessive grain growth that reduces fatigue life
Soak Time (per 25mm section)	Minimum 60 minutes	provides full carbide dissolution and temperature homogeneity to the core — critical for thick-wall rings and bars >200mm diameter
Quench Medium	Water quench (preferred) or forced air (sections ≤ 75mm)	Rapid cooling through the sensitisation range (870–425°C) must complete in < 3 minutes for sections >75mm to prevent chromium carbide precipitation
Post-Quench Temperature	≤ 38°C before dimensional inspection	Prevents measurement error from thermal expansion; our 10 furnaces have dedicated quench tanks and cool-down holding bays
Furnace Atmosphere	Neutral or slightly reducing	Oxidising atmospheres cause nitrogen loss from the surface layer (>0.1mm depth) — compromising the PREN of the component skin
Temperature Uniformity (AMS 2750)	±8°C across load	Our furnaces are calibrated quarterly to AMS 2750 Class 2 uniformity requirements — tighter than the API 6A minimum

What we do not do: Nitronic 50 / XM‑19 / UNS S20910 can’t be hardened by precipitation or aging heat treatments. It only gains strength from solid‑solution alloying.Any supplier that says they can make it stronger with “special aging” or “secret heat treatment” is either giving false information or using a different material. Cold working is the only way to strengthen it after annealing. All our forgings are shipped fully annealed unless we agree otherwise in the order.

Weldability of Nitronic 50 / XM-19 / UNS S20910 — What Your Fabricator Needs to Know

Nitronic 50 / XM-19 / UNS S20910 can be welded easily using all common fusion welding methods.But compared to 316L, this material is stronger and conducts heat less well, so it needs small process changes that most product sheets do not mention.We include this information because welding failures are often blamed on the forged material, when the real problem is using the wrong welding procedure.

Recommended Welding Processes & Filler Metals

Welding Guidelines for Nitronic 50 / XM-19 / UNS S20910 Forgings
Parameter	Recommendation	Notes
Welding Processes	GTAW (TIG), GMAW (MIG), SMAW, SAW	GTAW is more suitable for root passes and thin sections; SAW for heavy butt welds in rings >200mm wall
Matching Filler Metal	ER 209 (AWS A5.9) — composition-matched to UNS S20910	Maintains strength, corrosion resistance, and non-magnetic properties across the weld zone
Alternative Filler (over-alloyed)	ER 312 or Inconel 625 filler	Used when weld metal must match base metal properties in critical nuclear or sour-service joints — at higher cost
Preheating	Not required	Unlike ferritic or martensitic grades, XM-19 does not require preheat; interpass temperature should be kept ≤ 150°C
Post-Weld Heat Treatment (PWHT)	Not mandatory; optional full solution anneal at 1050°C if sensitisation is a concern	For NACE MR 0175 sour service applications, PWHT is recommended for welds in wall thickness >25mm to restore full corrosion resistance in the HAZ
Shielding Gas (GTAW/GMAW)	100% Argon or Ar + 2% N₂	Adding 2% N₂ to shielding gas compensates for nitrogen loss in the weld pool, maintaining PREN in the fusion zone
Post-Weld Cleaning	Pickling paste (HNO₃ + HF) or electropolishing	Heat tint and chrome-depleted surface layer must be removed within 10mm of the weld toe; wire brushing alone is insufficient for corrosion-critical service

Weld procedure qualification records (WPQRs) per ISO 15614-1 can be arranged for machined-and-welded assembly contracts upon customer request, and can recommend certified fabricators with proven experience in Nitronic 50 / XM-19 / UNS S20910 if needed.

Machining Nitronic 50 / XM-19 / UNS S20910 — Parameters from Our CNC Shop Floor

Nitronic 50 / XM-19 / UNS S20910 is much harder to machine than 316L stainless steel. Its machinability rating is only about 35–45% that of 316L. This is because it is stronger, hardens quickly while being cut, and tends to stick to cutting tools. Most product descriptions leave this out. We include it because customers who send these forgings to a general machine shop without this advice often end up with bad surface quality, out‑of‑tolerance parts, and very high tooling costs.

Key Machining Challenges Unique to XM-19 / Nitronic 50

Unlike 316L, which only work-hardens slowly, XM-19 / UNS S20910 hardens very quickly in a thin surface layer of 0.05–0.15 mm when cutting speed is too low or the feed is too light.This means the next cutting pass has to cut through an extra-hard outer layer that’s harder than the material inside. This causes vibration, tool breakage, and inaccurate dimensions.The unexpected fix is to use a higher feed rate and keep cutting continuously, without letting the tool stop or rub on the surface.

Recommended CNC Cutting Parameters — Nitronic 50 / XM-19 / UNS S20910 (Jiangsu Liangyi In-House Data)
Operation	Cutting Speed (m/min)	Feed Rate (mm/rev)	Depth of Cut	Tooling Recommendation
Rough Turning	30–50	0.25–0.50	3–6mm	Coated carbide (TiAlN), CNMG insert geometry, aggressive chipbreaker
Finish Turning	50–80	0.10–0.20	0.3–0.8mm	PVD-coated fine-grain carbide; sharp edge radius ≤ 0.02mm to minimise work hardening
Milling (face/end)	40–70	0.08–0.15 mm/tooth	≤ 3mm axial	Climb milling preferred; 4-flute AlTiN-coated end mills; avoid air blasts only — use flood coolant
Drilling	15–25	0.05–0.12	Full diameter	Solid carbide or cobalt HSS; peck drilling with full retract every 1.5× diameter to clear chips
Grinding (OD/ID)	25–35 m/s wheel speed	0.005–0.015mm/pass	—	Alumina or CBN wheels; copious flood coolant; dress wheel frequently to prevent glazing

Coolant is non-negotiable: Dry machining is not practical for producing Nitronic 50 / XM-19 / UNS S20910 parts.Our CNC shop uses soluble oil mixed at 8–10% concentration, with a flow rate of at least 20 liters per minute directed straight to the cutting area.This keeps the cutting edge from overheating and softening, clears chips that would damage and harden the surface, and is the most important factor for holding steady ±0.01mm tolerances on finished forgings.

Cryogenic Performance of Nitronic 50 / XM-19 / UNS S20910 — Down to −196°C

Most stainless steel product descriptions only say “good for low-temperature use” but show no data below −60°C.For LNG equipment, liquid nitrogen systems, and some nuclear applications, parts must work safely at −196°C (liquid nitrogen temperature) without breaking in a brittle way. Nitronic 50 / XM-19 / UNS S20910 is one of the few high-strength stainless steels that still keeps good toughness at this extreme temperature — and we show the real test data here.

Charpy V-Notch Impact Energy vs Temperature — Nitronic 50 / XM-19 / UNS S20910 Forgings (Jiangsu Liangyi Test Data)
Test Temperature	Charpy Impact Energy (Longitudinal)	Charpy Impact Energy (Transverse)	Fracture Mode
+20°C (ambient)	≥ 150 J	≥ 100 J	100% ductile
−46°C (API 6A Class LU)	≥ 80 J	≥ 55 J	100% ductile
−60°C (API 6A Class K)	≥ 65 J	≥ 45 J	100% ductile
−100°C	≥ 45 J	≥ 30 J	Predominantly ductile (>90%)
−196°C (liquid nitrogen)	≥ 25 J	≥ 18 J	Mixed ductile/cleavage (>60% ductile)

XM-19 / Nitronic 50 / UNS S20910 keeps its impact energy above 25 J at −196°C because its high nitrogen content maintains a fully austenitic structure.Duplex and ferritic steels become brittle at temperatures above −60°C. But austenitic alloys have an FCC crystal matrix, so their ductility does not have a fixed low-temperature limit. Their impact toughness goes down as temperature drops, but it never falls to zero like BCC ferritic steels.

A word on comparing cryogenic data across suppliers: Charpy impact values change based on forging reduction ratio, grain size, and cooling speed during heat treatment.Our test results above come from full-size specimens of 10×10×55mm, taken from the quarter-thickness part of forged bars. This is the most cautious sampling position according to ASTM A370.Specimens taken closer to the surface will always show higher impact energy.If a supplier provides low-temperature test data without listing specimen size, sampling position, and reduction ratio, that data cannot be fairly compared.

When to Choose — and When NOT to Choose — Nitronic 50 / XM-19 / UNS S20910

Every year, we lose some orders by telling customers not to use Nitronic 50 / XM‑19 / UNS S20910 when another alloy works better.But this honesty is why our customers keep coming back. Below is our simple, clear guide for choosing the right material.

✓ Choose Nitronic 50 / XM-19 / UNS S20910 When:

You need twice the yield strength of 316L without going to a nickel superalloy — this is the most common driver
Your application involves chloride exposure above 60°C where 316L faces SCC risk
The component must remain non-magnetic after cold work or machining (MRI facilities, subsea sensors, compasses, magnetic-sensitive instruments)
You are in H₂S sour service and need NACE MR 0175 compliance without steel's magnetic permeability
Your design calls for weight reduction vs 316L while maintaining load capacity — the higher strength allows thinner wall sections
Budget rules out Alloy 625 or Alloy 718 but 316L is demonstrably underperforming

✗ Consider Other Alloys When:

Temperature exceeds 500°C continuously — above this, sigma phase precipitation begins to degrade corrosion resistance; consider Alloy 625 or 310S
Concentrated sulfuric or hydrochloric acid at high temperatures — Hastelloy C-276 or C-22 are the right answer
Your application is purely structural with no corrosion requirement — carbon steel forgings at 1/10th the cost make more sense
Seawater full immersion at > 200m depth with chloride concentration above 35,000 ppm and stagnant flow — Super Duplex 2507 (PREN ≈ 43) provides a meaningful safety margin over Nitronic 50's PREN ≈ 34
You need age-hardenability or precipitation hardening — Nitronic 50 / XM-19 cannot be strengthened by aging; consider 17-4PH or Alloy 718

If your application falls in a grey zone, send us your operating conditions — temperature, pressure, fluid chemistry, cyclic loading, and dimensional envelope — and our metallurgists will give you an honest alloy recommendation within 24 hours, even if the answer is "not Nitronic 50."

Quality Standards & Certifications for UNS S20910 / XM-19 / Nitronic 50 Forgings

Our Nitronic 50 / XM-19 / UNS S20910 forgings are made and tested to meet the material and testing requirements of the following international standards. Jiangsu Liangyi holds ISO 9001:2015 certification; the standards below describe product requirements, not factory-level certifications held by Jiangsu Liangyi:

API 6A (ISO 10423) — Wellhead & Christmas Tree Equipment
NACE MR 0175 (ISO 15156) — Materials for H₂S-containing Environments in Oil and Gas Production
ASTM A370 — Standard Test Methods for Mechanical Testing of Steel Products
ASTM A388/A388M — Standard Practice for Ultrasonic Examination of Steel Forgings
ASTM A479/A479M — Stainless Steel Bars and Shapes for Use in Boilers and Pressure Vessels
ASTM A262 — Detecting Susceptibility to Intergranular Attack in Austenitic Stainless Steels
ASTM E10 — Standard Test Method for Brinell Hardness of Metallic Materials
ASTM E18 — Standard Test Method for Rockwell Hardness of Metallic Materials
ISO 148 — Metallic Materials – Charpy Pendulum Impact Test
EN 10204 — Metallic Products – Types of Inspection Documents (3.1 and 3.2)
ASME Section III — Forgings can be made to the material and testing requirements of Rules for Construction of Nuclear Facility Parts (on request, with customer-designated inspection)

We provide complete Mill Test Certificates (MTC) EN 10204 3.1 or 3.2 with every Nitronic 50 / XM-19 / UNS S20910 shipment. Customer-arranged third-party inspection by any accredited inspection agency is welcome and can be fully accommodated at our Jiangyin facility at any stage of production.

Why Choose Jiangsu Liangyi as Your Nitronic 50 / XM-19 / UNS S20910 Forging Partner?

China Manufacturing Advantage

Our factory in Jiangyin, Jiangsu Province, China offers competitive pricing, fast lead times, and access to a complete supply chain. We can deliver high-quality Nitronic 50 / XM-19 / UNS S20910 forgings at 30–50% lower cost than European or American manufacturers without compromising on quality. Our strategic location near Shanghai Port provides fast and efficient global shipping.

One-Stop Solution

We offer a full range of services for UNS S20910 / XM-19 (Nitronic 50), from steel melting and forging, to heat treatment, machining, and quality inspection.This removes the need for multiple suppliers, cuts project lead times by up to 40%, and keeps quality consistent through every step.

Advanced Forging & Inspection Equipment

Our 80,000 m² production plant is equipped with advanced forging equipment,including a 6,300T hydraulic press, a 5M seamless rolling machine, and 1T–9T electro-hydraulic hammers.This allows us to meet the most challenging forging requirements for XM-19 / Nitronic 50
We also have advanced inspection capabilities, including NDT, chemical composition analysis, mechanical property testing, and metallographic testing.

Experienced Engineering & Technical Team

Our team of more than 50 experienced engineers and metallurgists provides technical support, design optimization, and material selection advice for Nitronic 50 / XM-19 / UNS S20910 projects, helping you reduce costs and improve product performance.

Global Delivery & Customer Support

We export UNS S20910 / XM-19 / Nitronic 50 forgings to more than 50 countries around the world, including the United States, Canada, Germany, France, the United Kingdom, Australia, Japan, and the Middle East. Our multilingual team provides full support for logistics, customs clearance, and documentation.

Comprehensive Quality Guarantee

Nitronic 50 / XM-19 / UNS S20910 forgings include a full quality guarantee.We are ISO 9001:2015 certified and focused on continuous improvement.Any problems will be solved quickly and effectively .

Frequently Asked Questions (FAQ) About Nitronic 50 / XM-19 / UNS S20910 Forgings

Q: What is the difference between Nitronic 50 / XM-19 / UNS S20910 and Nitronic 60?

A: Nitronic 50 (UNS S20910 / XM-19) and Nitronic 60 are both types of stainless steel that have been made stronger by adding nitrogen. Nitronic 60 is stronger because it has more nitrogen, which is 0.30–0.50% compared to 0.20–0.40% for Nitronic 50. But Nitronic 50 is more cost-effective, easier to forge and machine, and more used in general industrial applications.

Q: Can UNS S20910 / XM-19 (Nitronic 50) be used in sour service environments?

A: Yes. UNS S20910 / XM-19 (Nitronic 50) has excellent resistance to sulfide stress cracking (SSC) and hydrogen-induced cracking (HIC), making it the best choice material for H₂S-containing environments per NACE MR 0175 (ISO 15156). It is specified for oil and gas wellhead equipment, valves, and pipelines in sour service conditions.

Q: What is the maximum size of Nitronic 50 / XM-19 / UNS S20910 forgings you can produce?

A: Jiangsu Liangyi can produce Nitronic 50 / XM-19 / UNS S20910 forgings up to 30,000 kg per piece. Maximum diameter is 6 meters for seamless rolled rings and 2 meters for solid bars. Custom shapes and sizes are available per customer drawings.

Q: What is the lead time for UNS S20910 / XM-19 / Nitronic 50 forgings?

A: Normal lead times for UNS S20910 / XM-19 / Nitronic 50 forgings are 4–6 weeks for standard sizes, and 6–8 weeks for custom parts. We offer expedited production with a 2‑week lead time, depending on material stock and production schedule.

Q: Do you provide CNC machining for XM-19 / Nitronic 50 / UNS S20910 forgings?

A: Yes. We provide complete CNC machining for XM-19 / Nitronic 50 / UNS S20910 forgings — turning, milling, drilling, grinding, and boring — to tolerances up to ±0.01 mm. Parts are available in as-forged, rough machined, or finish machined condition.

Q: What test certificates do you supply for Nitronic 50 / XM-19 / UNS S20910 forgings?

A: Every shipment of Nitronic 50 / XM-19 / UNS S20910 comes with a Mill Test Certificate (MTC) to EN 10204 3.1 or 3.2. This certificate includes chemical composition, mechanical test results, heat treatment records, and NDT reports. We are ISO 9001:2015 certified. We also welcome third‑party inspections arranged by customers at our Jiangyin factory, by any accredited inspection organization.

Q: Is Nitronic 50 / XM-19 / UNS S20910 magnetic after machining or cold work?

A: No — and this is one of the most important practical differences between Nitronic 50 / XM-19 / UNS S20910 and standard 304/316. Standard austenitic steels can form some martensite during cold working or machining, which raises magnetic permeability from around 1.02 to over 1.5. But XM‑19’s high nitrogen content prevents martensite from forming, even with 30–40% cold deformation. Jiangsu Liangyi tests magnetic permeability on all finished parts using a Förster permeameter. Our production guarantee is ≤ 1.005 µ on every surface, including machined areas. That’s why this material is used in MRI equipment, subsea navigation devices, and sensor housings — where even small magnetic signals can cause false readings.

Q: What is the PREN value of Nitronic 50 / XM-19 / UNS S20910 and how does it compare to 2205 Duplex?

A: Using the formula PREN = %Cr + 3.3×%Mo + 16×%N with the typical chemical composition of UNS S20910, we get a result of 34.225, which is nearly equivalent to the PREN value of around 35 for standard 2205 duplex stainless steel, meaning they offer almost the same pitting corrosion resistance. The critical differences lie in their magnetic and low-temperature properties: 2205 duplex is magnetic with a permeability of about 1.8–2.2 and loses toughness below −40°C, while Nitronic 50 / XM-19 / UNS S20910 remains non‑magnetic and ductile all the way down to −196°C, making it unrivaled at its price range for applications that need both strong chloride pitting resistance and stable non‑magnetic performance.

Q: What solution annealing temperature is correct for Nitronic 50 / XM-19 / UNS S20910 forgings?

A: The correct heat treatment range is 1040°C – 1120°C followed by rapid water quenching. Temperatures below 1040°C leave carbides and sigma phase undissolved, weakening corrosion resistance, while temperatures above 1120°C cause excessive grain growth that shortens fatigue life. The minimum soak time should be 60 minutes for every 25mm of section thickness. Jiangsu Liangyi’s furnaces are calibrated to AMS 2750 Class 2 with ±8°C temperature uniformity, which is stricter than API 6A requirements, and every heat treatment cycle is fully documented and included in the Mill Test Certificate. It is important to note that Nitronic 50 / XM‑19 / UNS S20910 cannot be age‑hardened, so any supplier claiming to achieve higher strength through proprietary aging is either giving false information about the material or providing a different alloy altogether.

Q: Can Nitronic 50 / XM-19 / UNS S20910 be welded, and what filler metal should be used?

A: Yes — Nitronic 50 / XM‑19 / UNS S20910 is fully weldable using GTAW, GMAW, SMAW, and SAW processes without preheating. The preferred matching filler metal is ER 209 (AWS A5.9), while Inconel 625 filler is often specified for important joints in nuclear or sour‑service applications. Interpass temperature must be kept at 150°C or lower, and post‑weld heat treatment is not needed but recommended for sections over 25mm thick when used in NACE MR 0175 service. A commonly overlooked detail is that adding 2% nitrogen to GTAW shielding gas makes up for nitrogen loss in the weld pool and preserves the PREN value in the fusion zone; without this adjustment, the weld metal can lose corrosion resistance down to a level similar to 316L even when the correct filler metal is used.

Q: How difficult is Nitronic 50 / XM-19 / UNS S20910 to machine compared to 316L?

A: Nitronic 50 / XM‑19 has a machinability index of only 35–45% that of 316L, making it roughly twice as difficult to machine, and the main difficulty comes from its rapid work hardening—if the tool uses too light a feed, it will harden the surface layer before cutting, leading to chatter and dimensional errors, so the counter‑intuitive but effective method is to increase feed rate and maintain continuous cutting without pausing. For machining, we recommend TiAlN‑coated carbide inserts with CNMG geometry, flood coolant at a flow rate of at least 20 L/min, and climb milling; rough turning parameters should be set at 30–50 m/min cutting speed and 0.25–0.50 mm/rev feed. Jiangsu Liangyi’s CNC workshop consistently achieves ±0.01mm tolerances on finished XM‑19 / Nitronic 50 parts by following these processing standards, and dry machining is not recommended for this alloy in any formal production process.

Q: What is the maximum continuous service temperature for Nitronic 50 / XM-19 / UNS S20910?

A: For continuous use in corrosion‑critical applications, the practical maximum service temperature is around 500°C. Above this temperature, sigma phase gradually forms at grain boundaries over time, which steadily reduces corrosion resistance and impact toughness. For structural use only, with no strict corrosion requirements, the material can retain useful strength up to approximately 700°C, though this is not standard industry practice. In corrosive environments above 500°C, Alloy 625 or 310S are more suitable choices. On the low‑temperature side, Nitronic 50 / XM-19 / UNS S20910 performs extremely well down to −196°C, maintaining Charpy impact energy above 25 J at liquid nitrogen temperature, making it one of the few high‑strength stainless steels ideal for LNG and other cryogenic applications.

Q: How do I verify that Nitronic 50 / XM-19 / UNS S20910 forgings I receive are correctly heat treated?

A: Three tests catch the majority of improper heat treatment: (1) Hardness check — correctly annealed material reads 220–280 HB; above 300 HB suggests insufficient annealing or substituted material. (2) Magnetic permeability — any reading above 1.010 µ on solution-annealed material indicates incomplete carbide dissolution or phase contamination. (3) ASTM A262 Practice E oxalic acid etch — a step or dual structure means sensitisation and is a fail; a fully ditched structure is acceptable. Jiangsu Liangyi performs all three on every production batch and includes results in the MTC. We welcome third-party witness inspection at any stage.

Q: What is the minimum order quantity (MOQ) for Nitronic 50 / XM-19 / UNS S20910 forgings?

A: Jiangsu Liangyi does not set a fixed minimum order quantity for Nitronic 50 / XM-19 / UNS S20910 forgings. Whether you need a single 30 kg prototype or a full production run of 500 pieces, we handle all inquiries using the same quotation process. Unit price and lead time are mainly affected by the total weight of the order; for example, a single 200 kg forging will have a higher per‑kilogram cost than a batch of 20 identical pieces. For engineering qualification orders of 1 to 5 pieces, we often combine these small orders with our scheduled production runs to lower costs and shorten lead times. Simply send us your technical drawing, material specification, and required quantity, and we will provide a precise quotation within 24 hours.

Contact Us for Nitronic 50 / XM-19 / UNS S20910 Forging Quotations

Jiangsu Liangyi is your trusted China partner for high-quality Nitronic 50 / XM-19 / UNS S20910 forging parts. With our advanced manufacturing facilities, experienced engineering team, and strict quality control processes, we deliver custom solutions that meet your exact requirements and budget.

Whether you need standard UNS S20910 / XM-19 (Nitronic 50) bars and rings or custom forged parts, we are here to help. Contact us today with your drawings, material specifications, and quantity requirements for a detailed and competitive quotation.

Request a Free Quote Now

Email:
sales@jnmtforgedparts.com

Phone / WhatsApp:
+86-13585067993

Website:
www.jnmtforgedparts.com

Address:

Chengchang Industry Park, Jiangyin City,
Jiangsu Province, China 214400