Table of Contents
⚡ 1.5415 / 16Mo3 / 15Mo3 — Basic Information
1.5415 (16Mo3, 15Mo3) Forged Products
Custom 1.5415 (16Mo3, 15Mo3) Forged Product Forms & Open Die Forgings
We supply fully custom 1.5415, 16Mo3, 15Mo3 forged parts in a full range of forms, manufactured as per your exact drawings and technical manuals. Our production capacity covers single parts from 30KGS to 30,000KGS, with an annual output of 120,000 tons, supporting both sample production and mass manufacturing. The shapes we can make are as below but not limited:
- Forged Steel Bars & Rods : 1.5415 round bars, square bars, flat bars, rectangular bars and step bars
- Forged Shafts : 15Mo3 step shafts, gear shafts, pump shafts, valve stems, turbine shafts and custom machined shafts
- Seamless Rolled Rings : 16Mo3 seamless rolled forged rings, guide rings, seal rings, labyrinth rings, gear rings and flange blanks
- Hollow Forged parts : 1.5415 forged sleeves, bushes, bushings, housings, shells, cases, barrels and hollow bars
- Plates, Discs & Blocks : 1.5415 forged discs, dished ends, blocks, plates and forgings for tube sheets
- Piping & Pipeline parts : 16Mo3 forged pipes, tubes, tubing shells, casings, nozzles, wye pieces, swept branches and elbows
- Valve & Pump Forgings : 15Mo3 forged valve bodies, bonnets, balls, seat rings, closures, pump casings, impellers, wear rings and fluid end blocks
- Custom Machined Forgings : 1.5415 double studded adapter flanges, venturi meter bodies, frac pump modules, casing heads, tubing spools and bespoke parts
Need custom 1.5415 (16Mo3) forged parts? Send us your drawings for a free quote
Request Custom QuoteMelting Requirements & Production Standards for 1.5415 (16Mo3) Forgings
Strict Steel Melting Requirements
All our 1.5415, 16Mo3, 15Mo3 forging materials are produced in accordance with international quality standards, with full traceability from melting to finished machining.
Our main melting process methods include:
- Primary melting via Electric Arc Furnace (EAF) or blast furnace + oxygen blast converter, with subsequent ladle refining treatment
- Full vacuum degassing to ensure material purity, reduce inclusions and improve structural stability
- Non-radioactive material properties, suitable for nuclear power and other high-safety requirement uses
- Minimum quality class MQ in accordance with ISO 6336-5 or DIN 3990-5 standards
- Full mill test certificate (MTC) EN 10204 3.1 / 3.2 available for all orders
European & International Production Standards
Our 1.5415 (16Mo3, 15Mo3) forged parts are fully accordance with the following European and international standards for pressure purposes and elevated temperature uses, matching the requirements of our global customers:
- EN 10028-2: 2009 : Flat products made of steels for pressure purposes - Non-alloy and alloy steels with specified elevated temperature properties
- EN 10222-2: 2000 : Steel forgings for pressure purposes - Ferritic and martensitic steels with specified elevated temperature properties
- EN 10216-2: 2014 : Seamless steel tubes for pressure purposes - Technical delivery conditions - Non-alloy and alloy steel tubes with specified elevated temperature properties
- EN 10217-5: 2002 : Welded steel tubes for pressure purposes - Submerged arc welded non-alloy and alloy steel tubes with specified elevated temperature properties
- EN 10217-2: 2002 : Welded steel tubes for pressure purposes - Electric welded non-alloy and alloy steel tubes with specified elevated temperature properties
- EN 10253-2: 2007 : Butt-welding pipe fittings - Non alloy and ferritic alloy steels with specific inspection requirements
- EN 10273: 2007 : Hot rolled weldable steel bars for pressure purposes with specified elevated temperature properties
For more information about our material standards and certifications, please visit our Materials Page or contact our technical team.
16Mo3 Welding Performance & Heat Treatment Guidelines
As a weldable pressure vessel steel, 1.5415 (16Mo3) offers good weldability, making it the best choice for fabricators and engineering companies worldwide. Our forgings are supplied with optimized microstructure to ensure consistent welding performance, with the following main guidelines:
Welding Compatibility
16Mo3 steel is compatible with all common industrial welding methods, including Shielded Metal Arc Welding (SMAW), Gas Metal Arc Welding (GMAW), Submerged Arc Welding (SAW), Tungsten Inert Gas Welding (TIG) and Plasma Arc Welding (PAW).We can supply pre-welded parts or raw forgings that are ready for on-site fabrication, and the full weldability test data is available based on request.
Preheating & Post-Weld Heat Treatment (PWHT)
- Preheating to 150-250°C is recommended for sections that are thicker than 15 mm, which can prevent cold cracking and hydrogen-induced defects
- Inter pass temperature should be maintained between 150-300°C during welding
- Post-weld heat treatment at 580-620°C is mandatory for pressure vessel parts, with a holding time based on section thickness, to relieve residual stress and restore the material's creep resistance and toughness
Based on 25+ years of manufacturing 16Mo3 forgings for European pressure vessel, our metallurgical team recommends specifying EN 10222-2 forging grade with full vacuum degassing when wall thickness exceeds 100mm — this significantly improves UT inspection pass rates and reduces the risk of hydrogen-induced cracking in heavy section forgings during post-weld heat treatment.
Heat Treatment for Forged parts
All our 1.5415 (16Mo3) forgings receive standardized heat treatment to ensure good mechanical properties. They are normalized at 900–940°C with controlled cooling. Optional tempering at 600–650°C is available to meet your required strength and toughness.The whole treatment records are provided for every batch.
Quality Control for 1.5415 Forged Parts
We have a strict quality management system for every 1.5415 (16Mo3, 15Mo3) forging parts , so we almost have zero defects and all of our parts can meet your specifications
- Raw Material Inspection : Full chemical composition analysis, grain size testing and inclusion rating for all incoming steel billets,.Only qualified materials are used in production.
- Forging Process Monitoring : we real-time monitor the forging temperature, reduction ratio and forming sizes to make sure all parts have correct forging structure and eliminate internal defects
- Heat Treatment Verification : Full tracking of heat treatment parameters, with hardness testing and microstructure inspection after heat treatment to make sure mechanical properties
- Machining Size Inspection: we use CMM (Coordinate Measuring Machine) and precision gauges to inspect full sizes, which make sure all parts meet your drawing tolerances
- Non-Destructive Testing (NDT) : Mandatory ultrasonic examination (UT) for all pressure vessel parts, with optional magnetic particle inspection (MT), liquid penetrant testing (PT) and radiographic testing (RT) available based on your requirements
- Final Documentation Review : we review all test reports and traceability documents before shipment, which make sure complete and accurate documentation for your project
Learn more about our production and testing capabilities on our Equipment Page.
Chemical Composition & Mechanical Properties of 1.5415 (16Mo3, 15Mo3) Steel
Chemical Composition (Mass Fraction, %)
| Element | Carbon (C) | Silicon (Si) | Manganese (Mn) | Phosphorus (P) | Sulfur (S) | Nitrogen (N) | Copper (Cu) | Chromium (Cr) | Nickel (Ni) | Molybdenum (Mo) |
|---|---|---|---|---|---|---|---|---|---|---|
| Standard Range | 0.12 - 0.20 | ≤ 0.35 | 0.40 - 0.90 | ≤ 0.025 | ≤ 0.010 | ≤ 0.012 | ≤ 0.30 | ≤ 0.30 | ≤ 0.30 | 0.25 - 0.35 |
Room Temperature Mechanical Properties
| Nominal Thickness (e) mm | Yield Strength (ReH) Minimum MPa | Tensile Strength (Rm) MPa | Total Elongation (A) Minimum % |
|---|---|---|---|
| ≤ 16 mm | 275 | 440 - 590 | 22 |
| > 16 mm | 270 |
Elevated Temperature Yield Strength (Rp0.2) Minimum MPa
| Temperature (°C) | 50 | 100 | 150 | 200 | 250 | 300 | 350 | 400 | 450 | 500 |
|---|---|---|---|---|---|---|---|---|---|---|
| ≤ 16 mm | 273 | 264 | 250 | 233 | 213 | 194 | 175 | 159 | 147 | 141 |
| > 16 mm | 268 | 259 | 245 | 228 | 209 | 190 | 172 | 156 | 145 | 139 |
16Mo3 Steel International Equivalents & Cross-Reference Chart
The table below provides a direct material cross-reference for engineers and procurement teams worldwide, supporting reliable material substitution and specification matching
| Standard | Designation | Material / Grade | C (%) | Mo (%) | Max Temp (°C) | Notes |
|---|---|---|---|---|---|---|
| EN 10028-2 | 16Mo3 | 1.5415 | 0.12–0.20 | 0.25–0.35 | 480 | European primary standard |
| DIN 17155 | 15Mo3 | 1.5415 | 0.12–0.20 | 0.25–0.35 | 480 | German predecessor; widely used |
| ASTM / ASME | A204 Grade B | — | ≤ 0.23 | 0.41–0.64 | 455 | US equivalent; higher Mo range |
| BS EN 10028-2 | 16Mo3 | 1.5415 | 0.12–0.20 | 0.25–0.35 | 480 | UK market (BS EN adoption) |
| NF EN 10028-2 | 16Mo3 | 1.5415 | 0.12–0.20 | 0.25–0.35 | 480 | France (NF EN adoption) |
| JIS G 3103 | SBV1B | — | ≤ 0.22 | 0.40–0.55 | 450 | Japanese near-equivalent |
* Chemical composition ranges and maximum service temperatures may vary slightly between standards. Always verify with your project specification.
Contact our technical team for substitution confirmation.
Get a Certified QuoteIndustry uses & Global Project Cases of 16Mo3 Forged Parts
Main Uses
1.5415 (also commercially known as 16Mo3 and 15Mo3) is a European standard elevated-temperature alloy steel, widely used in critical industrial uses that require good creep resistance, weldability and long-term stability at high temperatures and pressures.We provided 1.5415 forged parts to customers across Europe, the Middle East, Southeast Asia, Australia and 50+ countries worldwide. They are used in the important industries as below:
- Thermal Power Plant & Boiler Equipment
- Pressure Vessels & Heat Exchangers
- Oil & Gas (Onshore & Offshore) Extraction Equipment
- Petrochemical & Chemical Processing Equipment
- Nuclear Power Auxiliary Systems
- Marine & Shipbuilding Industry
- General Industrial Machinery & Hydraulic Equipment
Global Cases
European Thermal Power Plant Boiler Project
We supplied custom EN 10222-2 accordance with 16Mo3 forged tube sheets, cylinder shells, connecting nozzles and seal rings for a 450MW thermal power plant in Germany.
These 1.5415 forgings have good high-temperature creep resistance, meeting the strict requirements of long-term stable operation under 450℃ and high-pressure working conditions.
Middle East Offshore Oil & Gas Project
For a large offshore oil field development project in the United Arab Emirates, we produced API 6A 15Mo3 forged valve bodies, wellhead locknuts, casing heads, tubing hangers and high-pressure elbows.
These 1.5415 forgings meet the requirements of the strict corrosion resistance and ultra-high pressure of subsea Christmas tree systems
Australian Mining & Petrochemical Project
We provided 1.5415 forged high-pressure flanges, double studded adapter flanges and reactor shell parts for a large mineral processing plant in Australia.
we inspect the vacuum degassed 16Mo3 steel forgings with ultrasonic to make sure they have reliable performance in corrosive, high-temperature and high-pressure working environments.
Southeast Asia Chemical Plant Heat Exchanger Project
For a 2 million tons/year chemical plant in Thailand, we supplied EN 10028-2 compliant 16Mo3 forged channel flanges, tube sheets, piping shells and collecting chambers.
These 1.5415 forgings have good weldability and elevated temperature performance, and have been stably working in the plant's continuous production line for over 4 years.
China Nuclear Power Plant Coolant Pump Project
We supplied 1.5415 forged pump casings, containment seal chambers and seal rings for a 1000MW nuclear power plant's reactor coolant pump system.
The 16Mo3 forgings are produced based on nuclear grade quality standards, so that they have non-radioactive material properties and excellent structural stability, ensuring the safety of the main circuit system.
See more of our global project references on our Reference Page.
Frequently Asked Questions About 1.5415 (16Mo3, 15Mo3) Forgings
16Mo3 (also known as 1.5415 and 15Mo3) is a weldable, creep-resistant alloy steel mainly used for parts that work at elevated temperatures and pressures. It is used on steam boilers, pressure vessels, heat exchangers, oil and gas wellhead equipment, chemical processing reactors and power generation plant parts.
15Mo3 and 16Mo3 are both European standard elevated-temperature steels with very similar chemical composition and mechanical properties.They are different in the carbon content. 16Mo3 has a slightly higher minimum carbon content of 0.12–0.20% compared to 15Mo3, so it has higher strength at elevated temperature.The two grades are interchangeable for most pressure vessel and boiler uses.We produce forgings for both materials to the same high quality standards.
16Mo3 steel can work well at temperatures up to 480°C, with verified mechanical properties up to 500°C. It has stable creep resistance and structural stability during long-term high-temperature operation.This makes it an industry standard for medium-temperature pressure vessel uses.
16Mo3 steel meets European EN standards, including:EN 100282 (flat products for pressure purposes)EN 102222 (steel forgings for pressure purposes)EN 102162 (seamless steel tubes for pressure purposes)EN 10273 (hot rolled bars for pressure purposes)All our 16Mo3 forgings fully meet these standards.
16Mo3 steel has many international equivalent material grades, such as ASTM A204 Grade B (US standard), 15Mo3 (German DIN standard), and 16Mo3 (BS EN standard for the UK market). Although these grades have small differences in chemical composition ranges, they have similar mechanical properties and are widely used for high-temperature pressure vessel.We can make forgings that can meet all these equivalent international standards.
We can provide 1.5415 (16Mo3, 15Mo3) steel, from raw steel melting, open die forging, seamless ring rolling, heat treatment, to precision CNC machining and final testing. All parts are made according to your drawings, technical manuals and required international standards.We can produce single parts from 30KGS up to 30,000KGS and we can support both one piece sample order and large volume mass production orders
We provide full EN 10204 3.1 mill test certificates for all 16Mo3 (1.5415) forgings as standard, with EN 10204 3.2 third-party inspected certificates available on request. Our factory is an ISO 9001:2015-certified manufacturer, and our products meet European EN standards, API 6A standards for oil and gas uses, and CE marking requirements for the European market.
16Mo3 steel has good weldability, it can be operated with common welding methods including SMAW, GMAW, SAW and TIG. Preheating to 150-250°C is needed for thicker sections (over 15mm) to prevent cold cracking.Post-weld heat treatment (PWHT) at 580-620°C is needed for pressure vessel parts to relieve residual stress and restore creep resistance.All our 16Mo3 forgings are supplied with weldability test data on request.
After standard normalizing heat treatment (900–940°C), 16Mo3 (1.5415) steel typically has a Brinell hardness of 130–180 HBW.Following optional tempering at 600–650°C, hardness is always in the range of 130–160 HBW.These values show that the material has good machinability for precision CNC finishing.
Lead time depends on our clients drawing size and quantity.The normal lead times are: small parts (under 200 kg) — 15–25 days; normal size of parts (200–2,000 kg) — 20–35 days; large parts (over 2,000 kg) — 30–50 days, which include steel procurement, forging, heat treatment, machining, NDT inspection and certification. Urgent orders with short production times are also acceptable for us. Contact our team for the delivery schedule.
16Mo3 (1.5415) steel can be used in moderate hydrogen service environments after heat treatment and hardness control. To be used in sour gas (H ₂ S-containing) environments, the material must meet NACE MR0175 / ISO 15156 requirements, including a maximum hardness limit of 22 HRC (237 HBW).Our 16Mo3 forgings can be produced and tested to meet your specific project specification. The higher-alloy grades are a good choice for highly aggressive sour service.Our team can give clients good advice on the best material selection.
We accept single-piece prototype orders through to large-batch mass production orders, but there may be additional costs for very small orders (1–5 pieces). Please contact our sales team for a quote.We support both R&D sampling and full-scale industrial production based on the same strict quality standards to every order.
Get a Free Custom Quote for 1.5415 (16Mo3, 15Mo3) Forged Parts
Send us your detailed drawings, material specifications, quantity and project requirements. Our reference offer price is USD 2 per kg, and our technical team will provide you with a competitive quote and professional custom solution within 24 hours.
Send Your Inquiry NowContact Us for Your 1.5415 Forging Requirements
As a professional forging manufacturer based in China with over 25 years of experience, we have supplied high-quality 1.5415, 16Mo3 and 15Mo3 forged parts to customers around the world.If you have any need about our products, materials or capabilities, please contact us via the detailed information as below:
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Why Choose Us as Your 1.5415 (16Mo3) Forging Manufacturer?
Since 1997, Jiangsu Liangyi Co.,Limited has been a trusted partner for procurement engineers and project managers sourcing 1.5415 (16Mo3, 15Mo3) forged parts across Europe, the Middle East, Southeast Asia, Australia and North America.
Our competitive advantages include:
- Direct factory pricing — No intermediaries. All forgings manufactured in-house at our Jiangyin, Jiangsu facility, with 120,000 tons/year capacity.
- Full standard accordance — EN 10028-2, EN 10222-2, EN 10216-2, API 6A, ASME and all major international pressure vessel standards.
- Complete documentation — EN 10204 3.1 mill test certificates as standard; 3.2 third-party inspection available, full material traceability from heat to finished part.
- Flexible production range — Single piece from 30 kg up to 30,000 kg per piece, supporting R&D and mass production.
- Technical support — Our engineers help on material choice, drawing review, standard interpretation and welding procedure qualification.
See our full range of forged products on the Products Page, check our Materials Page for equivalent grades, or read verified Project References from our global customers.