AISI 347 (UNS S34700 / Grade 347) Forged Stainless Steel Parts

AISI 347 Forged Product Shapes & Manufacturing Capabilities

AISI 347 seamless rolled rings (up to 6 m OD, 30 tons per piece) produced by Jiangsu Liangyi, Jiangyin, Jiangsu, China

We manufacture a comprehensive range of AISI 347 stainless steel forgings in shapes and sizes to satisfy the most demanding project specifications. All forged products begin from certified AISI 347 (UNS S34700) ingot or billet with full material traceability.

What Is AISI 347 Stainless Steel? — Metallurgy & Mechanism Explained

The Sensitization Problem — And Why Niobium Solves It

To understand why AISI 347 exists, you must first understand sensitization. When unstabilized austenitic stainless steels such as AISI 304 are heated into the range of 427–816°C — which occurs in heat-affected zones (HAZ) during welding and during any sustained high-temperature service — carbon dissolved in the austenite migrates to grain boundaries and combines with chromium to form chromium carbide (Cr₂₃C₆). Each carbide particle removes chromium from a narrow zone on either side of the grain boundary, locally reducing the chromium concentration below the ~10.5% threshold required for passivation. The result is a network of chromium-depleted zones that are no longer corrosion resistant — a condition called sensitization.

A sensitized component may pass all standard dimensional and mechanical inspections yet fail catastrophically in service through intergranular corrosion — where corrosive media attack preferentially along grain boundaries, causing the grains to fall away. This is not a theoretical risk: it is a well-documented failure mode responsible for numerous industrial accidents in petroleum refineries, chemical plants, and nuclear facilities.

AISI 347 vs Other Stainless Steels — Full Comparison Table

Key Technical Advantages of AISI 347

• Sensitization Immunity: Niobium preferentially combines with carbon (NbC formation energy −144 kJ/mol vs. −75 kJ/mol for Cr₂₃C₆) to keep chromium fully dissolved in the austenite matrix, eliminating grain-boundary depletion permanently
• Polythionic Acid SCC Immunity: Since AISI 347 cannot sensitize, it cannot suffer PTA-SCC — the primary reason it is mandated in petroleum refinery process heaters, reformers, and hydrotreaters worldwide
• Superior Creep Rupture Strength: NbC precipitates act as barriers to dislocation motion at elevated temperature, improving 100,000-hour rupture stress by 15–25% over AISI 304 at 600–700°C
• As-Welded Service Without PWHT: Eliminates post-weld annealing operations, reducing fabrication cost by 15–30% for welded assemblies
• Broad Oxidation Resistance: Continuous service to 870°C (1600°F) in oxidizing atmospheres, intermittent to 925°C (1700°F)
• Excellent Fabricability: Readily formed, welded, and machined using standard austenitic stainless steel techniques
• Good General Corrosion Resistance: Comparable to AISI 304 in most aqueous and chemical environments

AISI 347 Physical, Thermal & Electrical Properties

These physical and thermophysical properties of AISI 347 (UNS S34700) are important for engineering calculations including thermal stress analysis, heat transfer design, and structural finite element modeling of high-temperature components. Values are for annealed condition at specified temperatures.

AISI 347 Corrosion Resistance — Environment-by-Environment Guide

Understanding the corrosion behavior of AISI 347 in specific service environments is critical for material selection. The following guide, based on published corrosion data and our manufacturing experience serving refinery, nuclear, and chemical processing customers since 1997, summarizes the grade's performance across the most common industrial environments.

AISI 347 International Grade Equivalents

AISI 347 (UNS S34700) has matching grades across all main international standard systems. When sourcing forgings from China for projects in Europe, Japan or other regions with local industry rules, Jiangsu Liangyi can provide parts with EN 10204 3.1 or 3.2 factory test reports, which prove the material meets chemical and mechanical rules of multiple standards at the same time. There are small differences in the upper limits of phosphorus, sulfur and nitrogen among different standards, while the basic material makeup and service performance stay equivalent.

Nb minimum difference: Note that ASTM (AISI 347) requires Nb ≥ 10×C, while EN 1.4550 requires Nb ≥ 8×C. In practice, Jiangsu Liangyi produces all AISI 347 material to the more stringent 10×C minimum to satisfy both standards simultaneously, avoiding the need for separate heats when supplying customers across different regional markets.

AISI 347 vs AISI 347H — Complete Technical Comparison

AISI 347H (UNS S34709) is the high-carbon variant of AISI 347, specifically designed to maximize creep strength at temperatures above 550°C. Understanding when to specify standard 347 versus 347H is one of the most common material selection decisions in high-temperature process equipment design.

Industrial Applications of AISI 347 Forged Parts

AISI 347 forged round bars (up to 2,000 mm diameter) manufactured by Jiangsu Liangyi, Jiangyin, Jiangsu, China

UNS S34700 forgings are the material of choice wherever sensitization, polythionic acid SCC, high-temperature creep, or as-welded corrosion resistance are the design-limiting failure modes. Jiangsu Liangyi has supplied AISI 347 forgings to industrial projects in more than 50 countries. The following section details specific applications, the material requirements each application imposes, and real project examples from our delivery history.

Oil & Gas Exploration and Production

AISI 347 is extensively used in oil and gas upstream equipment for two distinct reasons: its resistance to sour gas (H₂S) environments in downhole tools, and its intergranular corrosion resistance for surface wellhead and tree components. We manufacture wellhead components in accordance with API 6A requirements, and our forgings have been pressure-tested to 15,000 psi working pressure by customers' qualified inspection bodies.

• Downhole tools: Mud motor splined drive shafts, ESP motor splined shafts, drill collar connections — applications requiring strength, corrosion resistance, and the ability to be welded in the field without PWHT
• Wellhead equipment: Christmas tree body forgings, wellhead spool bodies, casing heads, tubing heads — manufactured to API 6A, 5,000–15,000 psi working pressure classes
• Valve components: Valve bodies, bonnets, stems, seat rings for ball valves, gate valves, check valves, and globe valves used in production gathering and processing systems
• Flanges and connectors: Double studded adapter flanges, integral mud flanges, studded crosses, tubing hangers, casing hangers, spacer spools
• Subsea equipment: Subsea tree bodies, manifold forgings, connector bodies — where long-term corrosion resistance without maintenance access is critical

Delivered Project: Over 500 metric tons of AISI 347 forged wellhead spool bodies and valve bodies for a major offshore oilfield development in Saudi Arabia and UAE. Forgings manufactured to API 6A dimensional and material requirements; material meets NACE MR0175/ISO 15156 chemistry and hardness criteria for sour service; working pressure verified to 10,000 psi by customer's qualified inspection body. Third-party material inspection by Bureau Veritas. Delivery completed on schedule over an 18-month project window.

Nuclear Power Generation

The nuclear power industry represents one of the most demanding applications for AISI 347: components must maintain structural integrity, corrosion resistance, and dimensional stability over 40+ year design lifetimes under elevated temperature and pressurized water coolant. AISI 347's inherent sensitization immunity is critical in these environments. Our forgings for nuclear applications are produced under our ISO 9001:2015 quality management system with enhanced traceability controls, and are supplied with full EN 10204 3.1 or 3.2 mill test certificates. Final nuclear component qualification is performed by our customers' ASME-authorized inspection bodies and Nuclear Steam Supply System (NSSS) suppliers.

• Nuclear reactor coolant pump (RCP) casings, pump shells, and suction nozzle bodies
• Containment seal chambers, reactor pressure vessel nozzles, and reactor internals
• Steam generator channel heads, tube sheets, and support structures
• Primary coolant piping supports, valve bodies, and pump motor casings
• Spent fuel pool equipment and handling tools

Delivered Project: Supplied AISI 347 reactor coolant pump casing forgings and steam generator channel head nozzles for three 600 MW thermal power units in Southeast Asia. Forgings supplied with EN 10204 3.2 mill test certificates, covering full chemical analysis, mechanical testing, heat treatment records, and NDT results; third-party material inspection by TÜV Rheinland at our factory. Customer's authorized nuclear inspection body performed final component qualification per project specifications. All three units passed commissioning testing without defect finding related to forging material.

Valve Manufacturing Industry

The valve manufacturing sector is one of the highest-volume applications for AISI 347 forgings globally. Critical valves — those whose failure would cause process shutdown, safety incidents, or environmental release — are routinely specified in AISI 347 for high-temperature service. The grade's excellent machinability (better surface finish than many lower-alloy grades due to the fine niobium carbide distribution) combined with its proven corrosion resistance makes it the preferred substrate for precision-machined seat rings and stems.

• Valve bodies, bonnets, and pressure-containing parts for globe, gate, ball, butterfly, and check valves
• Precision-machined valve balls, stems, seat rings, and discs where dimensional stability after machining is critical
• Butterfly valve main shafts requiring fatigue strength and corrosion resistance simultaneously
• Cryogenic valve bodies and components (tested at −196°C with Charpy V-notch qualification)
• HPBV Flowseal cryogenic high-performance butterfly valve shafts, H-type two-way and back-pressure valve components

Delivered Project: Supplied precision-machined AISI 347 valve stems, seat rings, and body forgings to a leading valve manufacturer in the United States over a 5-year framework agreement. Components used in critical petrochemical processing units including delayed cokers, fluid catalytic crackers (FCC), and hydrocracking units — all environments where PTA-SCC immunity is a mandatory design requirement. Meeting API 607 and API 602 standards; zero field failures reported across 3,000+ valves in service.

Petrochemical & Petroleum Refining

The petroleum refining industry is, arguably, the industry where AISI 347's unique combination of properties has saved the most money and prevented the most accidents. Petroleum refinery process units — hydrotreaters, reformers, hydrodesulfurizers, cokers — all produce polythionic acids (H₂SₓO₆) during shutdowns when sulfide scale contacts air moisture. AISI 347 is immune; AISI 304 and 316 are not. The cost of replacing a sensitized and PTA-SCC-damaged heat exchanger tube sheet or reformer header dwarfs the material premium of AISI 347.

• Process heater tubes and tube sheets in catalytic reformers and hydrotreaters (PTA-SCC immune)
• Heat exchanger tube sheets, channel flanges, and baffle plates for high-temperature service
• Reactor vessels, pressure vessel nozzles, and connecting flanges
• Venturi cone meter bodies and ultrasonic flow meter spool bodies for high-temp process measurement
• Column trays, vessel internals, and distributor piping in distillation units

Delivered Project: Manufactured 45 AISI 347 heat exchanger tube sheets (maximum diameter 2,400 mm, maximum weight 8,200 kg each) for a large integrated petrochemical complex in Germany. Service conditions: 430°C, hydrogen-rich atmosphere with H₂S, sulfur compounds. Previous AISI 304 tube sheets had failed within 18 months due to sensitization and PTA-SCC; AISI 347 replacements are now in their 7th year of service without incident. Supplied with EN 10204 Type 3.2 mill test certificates (third-party co-signed by TÜV inspector); material meets the composition and mechanical requirements of AD 2000-W2.

Turbomachinery & Rotating Equipment

Turbomachinery applications impose simultaneous demands that few materials can satisfy: high strength at elevated temperature, fatigue resistance under cyclic loading, dimensional stability under centrifugal forces, and corrosion resistance in process gas streams. AISI 347's superior creep rupture properties compared to AISI 304 at temperatures above 500°C make it preferred for impellers, diffusers, and rotating components in centrifugal compressors and high-temperature pumps.

• Centrifugal compressor impellers and shrouded impellers — precision-balanced, bored and finish-machined to ISO 1940 G6.3 or better
• High-temperature centrifugal pump casings, covers, barrels, and wear rings
• Pump shafts, impellers, and diffuser rings for boiler feed, hydrocarbon, and process service
• Transition cones and gas turbine components in heat recovery steam generators (HRSG)
• Expander wheels and turbine diaphragms in organic Rankine cycle (ORC) and waste heat recovery systems

Delivered Project: Produced 12 AISI 347 centrifugal compressor impellers for a European turbomachinery OEM over three years. Impellers operate at 15,000 RPM, 650°C, in a cracked gas process stream. Forging reduction ratio ≥6:1 to ensure fine, uniform grain structure; machined to ±0.02 mm profile tolerance; final dynamic balance to ISO 1940 G1.0. Post-delivery performance review: zero impeller failures across all 12 units after 3+ years of operation.

Power Generation — Fossil Fuel & Biomass

AISI 347 has been used in fossil fuel power generation equipment for decades, particularly in boiler superheaters, reheater headers, and steam turbine admission valve bodies. As power generation moves toward higher efficiency (requiring higher steam temperatures and pressures), AISI 347 and 347H are increasingly specified for components that previously used lower-alloy ferritic steels.

• Superheater and reheater headers in once-through boilers and drum boilers
• Main steam and hot reheat valve bodies, including turbine stop valves and control valves
• Turbine bypass valve bodies and steam conditioning valve bodies
• Heat exchanger pressure parts in heat recovery steam generators (HRSG)
• Flue gas desulfurization (FGD) system pump casings and valve bodies exposed to sulfurous acid

Delivered Project: Supplied 24 AISI 347 main steam stop valve body forgings and 48 turbine control valve body forgings for a 600 MW supercritical coal-fired power unit in India. Design conditions: 571°C, 246 bar main steam. Forgings manufactured to ASME Section II Part A material requirements and ASME B31.1 piping code material specifications; solution annealed and water-quenched; 100% UT to ASTM A388. All forgings met ASME allowable stress values; unit commissioned on schedule.

Marine & Offshore

Marine environments combine chloride-containing saltwater with elevated temperature in exhaust systems, creating one of the most aggressive corrosion environments encountered in engineering. AISI 347 is used where the primary degradation mode is oxidation or sensitization rather than chloride pitting — for example, in marine exhaust systems and turbine gas paths where temperature is the dominant factor and direct seawater contact is limited.

• Marine diesel engine exhaust systems, turbocharger housings, and exhaust manifolds (high-temp oxidation environment, not chloride-wet)
• Shipboard fired heater components and heat recovery systems
• Offshore platform process valve bodies and heat exchanger components above deck
• LNG carrier cargo pump casings where both cryogenic toughness and weld zone integrity are needed
• Naval and commercial vessel propulsion system components

Delivered Project: Manufactured AISI 347 marine exhaust system components — turbocharger housing forgings, exhaust manifold flanges, and expansion joint rings — for shipbuilding companies in South Korea and Japan. Components supplied with EN 10204 3.2 mill test certificates; material composition, mechanical properties, and NDT results reviewed and accepted by DNV GL third-party inspector at our factory. Parts successfully passed 4-year service review across 30+ vessels.

Aerospace & Defense

Aerospace applications demand the highest quality forgings, with zero tolerance for material defects, tight dimensional tolerances, and complete material traceability from raw material to finished part. AISI 347 is used in aircraft engine components, exhaust systems, and structural parts where its combination of high-temperature strength, oxidation resistance, and non-magnetic behavior (important in some navigation and sensor systems) is required.

• Aircraft engine exhaust system components, afterburner rings, and jet pipe supports
• Hydraulic actuator bodies and valve manifolds for flight control systems
• Environmental control system (ECS) heat exchanger components
• Landing gear structural forgings and actuator housings
• Precision fasteners, pins, and bushings for high-temperature structural joints

Delivered Project: Supplied precision AISI 347 engine exhaust ring forgings and hydraulic manifold blocks for two European aerospace supply chain manufacturers. All material lot-traced from EAF heat number to finished part serial number; Charpy impact tested at −60°C; dimensional CMM measured to 0.01 mm; full material traceability documentation provided per customer quality requirements. Zero non-conformance reports raised over 3-year supply period.

AISI 347 (UNS S34700) Material Specifications

Chemical Composition Limits

Mechanical Properties — Delivery Condition (Solution Annealed)

Elevated Temperature Tensile Properties

The following data shows how AISI 347 tensile and yield strength degrade with increasing temperature — essential for pressure vessel, piping, and valve design calculations. Values are typical averages for solution-annealed wrought product.

AISI 347 Welding Technical Guide

AISI 347 is one of the most weldable austenitic stainless steels in industrial use. Its niobium stabilization eliminates the post-weld heat treatment requirement that complicates field fabrication of AISI 304 assemblies. The following welding guidance is based on AISI/AWS standards and Jiangsu Liangyi's experience as a forging supplier to weld-fabricated assemblies in 50+ countries.

Jiangsu Liangyi Manufacturing Process for AISI 347 Forgings

Our fully integrated manufacturing process — from raw steelmaking through forging, heat treatment, machining, and inspection — gives us unique control over every variable that determines final forging quality. Unlike forging houses that buy billets from third-party mills, we control our own alloy chemistry from the electric arc furnace, eliminating the supply chain risks that cause composition non-conformances, traceability gaps, and heat treatment inconsistencies.

1. Raw Material Verification — Chemistry Before Forging
   Every incoming AISI 347 ingot or billet is tested by OES (optical emission spectrometry) in our in-house laboratory before entering production. We verify all composition elements including the critical Nb/C ratio (must be ≥10×C). Any heat failing specification is quarantined before production begins. This step eliminates the most common root cause of non-conforming forgings: incorrect incoming material that passes visual inspection but fails chemistry.
2. In-House Steelmaking — EAF + LF + VOD
   Raw scrap material is melted for the first time in our 30-ton electric arc furnace (EAF). The 30-ton ladle refining furnace (LF) precisely adjusts chemical composition to exact standard limits and performs desulfurization to maintain sulfur content below 0.010%, substantially enhancing material toughness. The 30-ton vacuum degassing furnace (VOD) removes dissolved hydrogen, nitrogen and oxygen to make high-purity steel with few internal defects. The raw ingots are cast and solidified with controlled cooling conditions and then transported to the forging shop for further processing.
3. Forging — Grain Refinement & Defect Closure
   AISI 347 ingots are heated to the forging temperature range of 1,150–1,230°C in our gas-fired furnaces. Forging is performed using 2,000–6,300 ton hydraulic presses (for bars, discs, blocks, and heavy custom shapes) or 0.75–9 ton electro-hydraulic forging hammers (for stepped shafts and medium shapes). Seamless rolled rings are produced on our 5-meter ring rolling mill, capable of rings up to 6 m OD and 30 tons. We maintain forging finishing temperature above 900°C minimum to prevent hot cracking and ensure complete recrystallization of the austenite. Minimum forging reduction ratio is 3:1 (typically 4:1–8:1) to ensure complete breakdown of cast ingot structure.
4. Solution Annealing — Restoring Full Corrosion Resistance
   After forging, AISI 347 components are solution annealed at 1,010–1,065°C in our ten controlled-atmosphere furnaces, followed by water quenching within 3 minutes of removal from the furnace. This rapid quench is critical: it prevents any chromium carbide from reprecipitating during slow cooling, ensuring the maximum possible corrosion resistance in the final product. We record and certify all heat treatment parameters (furnace ID, temperature, soak time, quench media, part weight) in the mill test certificate. Optional stabilizing anneal at 870–900°C is available for components where knife-line attack is a concern.
5. CNC Machining — Precision to Drawing
   Our CNC machining center performs turning, boring, milling, drilling, and grinding operations on forged blanks to produce components meeting customer drawings. Typical dimensional tolerances achievable: ±0.1 mm for standard machined surfaces, ±0.02 mm for precision bores and sealing faces, ±0.01 mm for special applications. Rings are balanced to ISO 1940 G6.3 or G2.5 upon request. All machined dimensions are verified by CMM (coordinate measuring machine) and reported in the inspection certificate.
6. Final Inspection & Certification — Nothing Leaves Without Documented Evidence
   Every AISI 347 forging undergoes a systematic inspection sequence: (a) Visual inspection according to ASTM standards; (b) Checking dimensions against the drawing; (c) Hardness testing at a minimum of 3 places per piece; (d) Ultrasonic testing (UT) according to ASTM A388 or the customer’s requirements; (e) Surface testing using magnetic particle (MT) or liquid penetrant (PT); (f) Final OES chemical analysis on a test coupon from the same heat; (g) Tensile, yield, elongation, and reduction of area tests on material from the same heat. Results are put together into EN 10204 Type 3.1 (signed off by our QC team) or Type 3.2 (co-signed by a third party) mill test certificates, which are provided with every delivery.

Quality Control, Testing Standards & Certifications

Quality at Jiangsu Liangyi is not a final inspection check — it is built into every process step. Our ISO 9001:2015 quality management system is structured around process control at source rather than detection of defects after the fact. The following table summarizes our complete quality testing program for AISI 347 forgings.

Microstructure & Metallographic Testing

• Cleanliness examination per ASTM E45, Method D — maximum allowable rating: 2 thin, 1½ heavy for all inclusion types
• Grain size per ASTM E112: average prior austenitic grain size ASTM No. 5 or finer; individual grains to ASTM No. 3 acceptable if isolated and surrounded by fine grains
• Delta ferrite evaluation using Fischer Feritscope or metallographic image analysis — controlled to specification limits to avoid embrittlement in high-temperature service
• Sensitization test per ASTM A262 Practice E (copper/copper sulfate/sulfuric acid) — available upon customer request for critical applications where intergranular corrosion immunity must be demonstrated, not just assumed from composition

Nondestructive Testing (NDT) Methods

• Ultrasonic Testing (UT): Immersion UT or contact UT per ASTM A388 — full volumetric scan for internal defects including laminations, inclusions, and shrinkage; acceptance criteria per customer specification or ASTM A788
• Liquid Penetrant Testing (PT): Per ASTM E165 — detects surface-breaking cracks, seams, and laps on machined surfaces
• Magnetic Particle Testing (MT): N/A for paramagnetic austenitic 347 in annealed condition (μ ≈ 1.02); PT used instead
• Radiographic Testing (RT): Available on request for complex-geometry forgings where UT coverage is geometrically limited
• Positive Material Identification (PMI): XRF or OES spot-check on 100% of pieces in critical orders — confirms correct alloy grade, eliminates mix-up risk

Applicable Material & Testing Standards — Forgings Manufactured to These Requirements

Jiangsu Liangyi manufactures AISI 347 forgings to the material, dimensional, and testing requirements of the following standards. We are not a standards certification body; we supply forgings with EN 10204 3.1 or 3.2 mill test certificates documenting that all chemical, mechanical, and NDT results meet the applicable standard requirements.

• ASTM A182: Forged or Rolled Alloy and Stainless Steel Pipe Flanges, Forged Fittings, and Valves — Grade F347
• ASTM A336: Steel Forgings, Alloy, for Pressure and High-Temperature Parts — Class F347
• ASTM A473: Stainless Steel Forgings — Grade 347
• ASTM A276 / A479: Stainless Steel Bars and Shapes
• ASTM A388: Ultrasonic Testing of Heavy Steel Forgings
• ASTM E8/E8M: Tension Testing of Metallic Materials
• ASTM E10 / E92: Brinell and Vickers Hardness Testing
• ASTM E23: Notched Bar Impact Testing (Charpy)
• ASTM E112: Grain Size Measurement
• ASTM E45: Determination of Inclusion Content
• ASTM E139: Conducting Creep, Creep-Rupture, and Stress-Rupture Tests of Metallic Materials
• ASTM A262: Detecting Susceptibility to Intergranular Attack (sensitization test)
• API 6A: Specification for Wellhead and Christmas Tree Equipment
• ASME Section VIII Div. 1 & 2: Rules for Construction of Pressure Vessels
• ASME Section III: Rules for Construction of Nuclear Facility Components
• NACE MR0175 / ISO 15156: Materials for Use in H₂S-Containing Environments in Oil and Gas Production
• EN 10204 Type 3.1 / 3.2: Material Test Certificates
• AD 2000 W2: German Pressure Vessel Code

Material Selection Guide — When to Choose AISI 347

AISI 347 is not the right choice for every application. Choosing it correctly — and knowing when another grade performs better — is a sign of genuine engineering expertise. The following guide is based on our experience supplying forgings for thousands of projects across oil & gas, nuclear, petrochemical, and power generation industries.

Common Specification Mistakes When Ordering AISI 347 Forgings

After 25+ years of manufacturing AISI 347 forgings for global customers, our engineering team has identified several recurring specification mistakes that cause project delays, re-testing, or performance problems. We share these observations as a service to our customers:

Why Choose Jiangsu Liangyi as Your AISI 347 Forging Partner?

• 25+ Years of Specialized Experience Since 1997: More than two decades focused on stainless steel and alloy steel forgings for global industrial markets — not a generalist fabricator, but a specialist forging manufacturer with deep domain knowledge of alloy behavior, heat treatment, and testing
• Fully Integrated In-House Production: EAF steelmaking → forging → heat treatment → CNC machining → NDT → certification, all under one roof. Deletes supply chain interfaces where quality and traceability are lost
• Advanced Forging Equipment: 2,000–6,300 ton hydraulic presses, 5-meter seamless ring rolling machine (rings to 6 m OD, 30 tons), 0.75–9 ton electro-hydraulic hammers — covering the full range from 30 kg precision components to 30,000 kg heavy forgings
• ISO 9001:2015 Certified Quality System: Rigorous process-control approach — not inspection-based quality control — with complete heat and lot traceability from EAF heat number to finished forging serial number
• In-House Laboratory: OES spectrometer for full chemistry verification, mechanical testing equipment (tensile, hardness, impact), metallographic preparation, UT equipment — no outsourcing of critical quality tests
• Global Market Expertise: We understand the documentation, certification, and regulatory requirements of customers in the USA, EU, Middle East, Japan, South Korea, and other markets — not just Chinese domestic standards
• 50+ Countries Served: Proven track record of successful export logistics, customs documentation, and international shipping for time-critical project deliveries
• Third-Party Inspection Cooperation: Established working relationships with SGS, Bureau Veritas, TÜV Rheinland, Lloyd's Register, DNV GL, Intertek, and ABS — we know how to support third-party inspection efficiently to minimize project delays
• Responsive Technical Support: 24-hour response to technical inquiries; experienced application engineers who understand oil & gas, nuclear, and petrochemical specifications, not just metallurgy
• Competitive Pricing Without Quality Compromise: China-based manufacturing cost structure with international quality standards — the combination that has sustained 25+ years of repeat business from global customers

How to Request a Quote — What Information We Need

To prepare an accurate and detailed quotation for your AISI 347 forging requirement, please provide the following information. The more detail you include at the RFQ stage, the faster and more accurately we can respond — typically within 24 hours for standard requests.

Please send your inquiry with above information to  sales@jnmtforgedparts.com or via WhatsApp to +86-13585067993. We reply to all technical inquiries within 24 hours and to all quotation requests within 48 hours.

Frequently Asked Questions — AISI 347 (UNS S34700) Forgings