Precision-Engineered
Special Austenitic
Stainless Steel
Hunan Fushun Metal Co., Ltd. manufactures and exports special austenitic stainless steel to 52+ countries worldwide. Our product range covers nine specialist grades — from nitrogen-enhanced 304LN and 316LN to high-temperature 253MA and ultra-fine-grain 347HFG — each supplied with EN 10204 3.1 Mill Test Certificates and full heat traceability. Stock items ready in 7–15 days; custom production within 30 days.
Request a Free QuoteSpecial Austenitic Stainless Steel Product Range
Nine tightly specified grades for demanding industrial applications. Each card gives the engineer the five facts needed in under 10 seconds.
304LN
ASTM S30453 | EN 1.4311 | JIS SUS304LN
- UTS min515 MPa
- YS 0.2% min205 MPa
- N content0.10 – 0.16%
- Hardness max217 HB
Nitrogen-enhanced variant of low-carbon 304L. The tightly controlled N addition lifts yield strength without degrading weldability — the preferred choice for pressure vessels, structural components, and cryogenic containers.
316LN
ASTM S31653 | EN 1.4429 | JIS SUS316LN
- UTS min580 MPa
- YS 0.2% min270 MPa
- Mo content2.0 – 3.0%
- Hardness max248 HB
Molybdenum-bearing, nitrogen-strengthened evolution of 316L. Delivers superior pitting resistance alongside higher strength — ideal for pharmaceutical reactors, offshore pumps, and high-pressure marine pipework.
310MoLN
ASTM S31050 | EN 1.4466 | DIN X1CrNiMoN25-22-2
- UTS min540 MPa
- YS 0.2% min240 MPa
- Cr content24.0 – 26.0%
- C max0.020%
Ultra-high Cr (24–26%) and Ni (21–23%) with Mo and N additions. Engineered for the most aggressive corrosion environments — urea synthesis plants, nitric acid service, and hot concentrated acid media.
Nitronic 50 / XM-19
ASTM S20910 | EN 1.3964 | Trade: Fermonic 50
- UTS min690 MPa
- YS 0.2% min380 MPa
- N content0.20 – 0.40%
- Hardness max241 HB
High-nitrogen austenitic grade with Nb and V additions. Delivers twice the yield strength of 316L while maintaining excellent corrosion resistance in chloride environments — the standard for marine shafts, offshore fasteners, and pump shafts.
347H
ASTM S34709 | EN 1.4961 | JIS SUS347H
- UTS min515 MPa
- YS 0.2% min205 MPa
- Nb+Ta8×C min – 1.10%
- Max. service temp900°C
Niobium-stabilized austenitic grade with higher carbon for enhanced creep resistance at elevated temperature. Resists sensitization and intergranular corrosion; the workhorse material for superheaters, reheaters, and nuclear structural components.
253MA
ASTM S30815 | EN 1.4835 | F45
- UTS min600 MPa
- YS 0.2% min310 MPa
- Ce content0.03 – 0.08%
- Max. service temp1100°C
Rare-earth cerium combined with silicon and nitrogen creates an exceptionally stable, self-healing oxide scale. Enables continuous service up to 1100°C in oxidizing atmospheres — the benchmark material for furnace fixtures, radiant tubes, and burner nozzles.
316LMo
ASTM S31603 | EN 1.4435 | GOST 03Kh17N14M3
- UTS min485 MPa
- YS 0.2% min175 MPa
- Mo content2.5 – 3.0%
- Ni content12.5 – 15.0%
Enhanced 316L per EN 1.4435 with elevated molybdenum (2.5–3.0%) and nickel (12.5–15.0%) for improved pitting resistance in aggressive media. The grade of choice for pharmaceutical, food and beverage, and bio-processing equipment requiring maximum cleanliness standards.
316Nb
ASTM S31651 | EN 1.4981 | GOST 08Kh17N13M2B
- UTS min515 MPa
- YS 0.2% min205 MPa
- Nb stabilizer10×C min – 1.10%
- Mo content2.0 – 3.0%
Niobium-stabilized equivalent of 316 that permanently prevents sensitization during welding and elevated-temperature service. Recommended for welded assemblies in chemical plants, desalination equipment, and structures operating in the 400–900°C range.
347HFG
ASTM S34779 | EN 1.4988 | JIS SUS347HFG | GOST 08Kh17N13M2VB
- UTS min550 MPa
- YS 0.2% min220 MPa
- V content0.10 – 0.50%
- Max. service temp650°C
Very fine grain structure combined with Nb, V, and Mo additions delivers maximum long-term creep rupture strength. Certified for steam turbine discs, casings, and bolting in advanced high-efficiency power generation operating above 600°C.
Stock items ship in 7–15 days ■ Custom production within 30 days ■ Minimum order from 1 piece
Technical Specifications for Special Austenitic Stainless Steel
Complete chemical composition and mechanical property data referenced against ASTM, EN, and JIS standards. Use the tab toggle to switch between datasets.
| Grade | Cross-Reference | Primary Elements (wt%) | Key Alloying (wt%) | Special Elements | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| ASTM/UNS | EN / DIN | C max | Si max | Mn max | Cr | Ni | Mo | N | P max / S max | Additions | ||
| 304LN | S30453 | 1.4311 | 0.030 | 1.00 | 2.00 | 18.0 – 20.0 | 8.0 – 12.0 | — | 0.10 – 0.16 | 0.045 / 0.030 | — | |
| 316LN | S31653 | 1.4429 | 0.030 | 1.00 | 2.00 | 16.5 – 18.5 | 10.5 – 14.5 | 2.0 – 3.0 | 0.10 – 0.22 | 0.045 / 0.030 | — | |
| 310MoLN | S31050 | 1.4466 | 0.020 | 0.40 | 2.00 | 24.0 – 26.0 | 21.0 – 23.0 | 2.0 – 3.0 | 0.10 – 0.20 | 0.020 / 0.010 | — | |
| Nitronic 50 / XM-19 | S20910 | 1.3964 | 0.060 | 1.00 | 4.0 – 6.0 | 20.5 – 23.5 | 11.5 – 13.5 | 1.5 – 3.0 | 0.20 – 0.40 | 0.040 / 0.030 | Nb 0.10–0.30, V 0.10–0.30 | |
| 347H | S34709 | 1.4961 | 0.04 – 0.10 | 0.75 | 2.00 | 17.0 – 19.0 | 9.0 – 13.0 | — | — | 0.045 / 0.030 | Nb+Ta: 8×C – 1.10% | |
| 253MA | S30815 | 1.4835 | 0.05 – 0.10 | 1.40 – 2.00 | 0.80 | 20.0 – 22.0 | 10.0 – 12.0 | — | 0.14 – 0.20 | 0.040 / 0.030 | Ce 0.03–0.08% | |
| 316LMo | S31603 | 1.4435 | 0.030 | 1.00 | 2.00 | 17.0 – 19.0 | 12.5 – 15.0 | 2.5 – 3.0 | ≤ 0.11 | 0.045 / 0.030 | — | |
| 316Nb | S31651 | 1.4981 | 0.080 | 1.00 | 2.00 | 16.0 – 18.0 | 10.5 – 14.0 | 2.0 – 3.0 | — | 0.045 / 0.030 | Nb: 10×C min – 1.10% | |
| 347HFG | S34779 | 1.4988 | 0.06 – 0.10 | 0.75 | 2.00 | 16.0 – 18.0 | 11.0 – 14.0 | 0.30 – 0.60 | — | 0.040 / 0.030 | Nb+Ta: 8×C–0.80%, V 0.10–0.50% | |
| Sources: ASTM A276 / A484, EN 10088-3, EN 10088-4. All values in weight percent. Highlighted cells indicate critical differentiating elements for each grade. Verify current edition of applicable standard before design use. | ||||||||||||
| Grade | Condition | Room Temperature (20°C) | Standard Reference | |||
|---|---|---|---|---|---|---|
| UTS min (MPa) | YS 0.2% min (MPa) | Elongation min (%) | Hardness max (HB) | |||
| 304LN | Solution Annealed | 515 | 205 | 40 | 217 | ASTM A276 |
| 316LN | Solution Annealed | 580 | 270 | 40 | 248 | ASTM A276 / EN 10088-3 |
| 310MoLN | Solution Annealed | 540 | 240 | 35 | 220 | EN 10088-3 |
| Nitronic 50 / XM-19 | Solution Annealed | 690 | 380 | 35 | 241 | ASTM A276 (XM-19) |
| 347H | Solution Annealed | 515 | 205 | 40 | 217 | ASTM A276 |
| 253MA | Solution Annealed | 600 | 310 | 40 | — | EN 10088-3 |
| 316LMo | Solution Annealed | 485 | 175 | 40 | 215 | EN 10088-3 (1.4435) |
| 316Nb | Solution Annealed | 515 | 205 | 40 | 217 | ASTM A276 / EN 1.4981 |
| 347HFG | Solution Annealed | 550 | 220 | 35 | 210 | EN 10088-3 (1.4988) |
| All values are minimum requirements in solution-annealed condition unless otherwise noted. Highlighted cells indicate grades with notably elevated strength relative to standard 304/316. Contact our technical team for elevated-temperature creep and stress-rupture data. | ||||||
Available Dimensions
Standard size ranges for all nine special austenitic stainless steel grades. Custom cut-to-length and precision-machined blanks available on request.
Round Bar
- Diameter6 – 800 mm
- LengthUp to 6,000 mm
- Toleranceh9 / h11 / as-forged
- SurfaceBlack / Turned / Ground
Flat Bar
- Thickness5 – 150 mm
- Width20 – 600 mm
- LengthUp to 6,000 mm
- ToleranceEN 10058 / custom
Plate & Sheet
- Thickness3 – 200 mm
- WidthUp to 3,000 mm
- LengthUp to 12,000 mm
- Finish2B / No.1 / PVC coated
Strip & Coil
- Thickness0.1 – 3.0 mm
- Width3 – 650 mm
- DeliveryCoil or cut-to-length
- FinishBA / 2B / No.4
Wire
- Diameter0.05 – 12 mm
- DeliveryCoil / spool / straightened
- ConditionAnnealed / cold-drawn
- SurfaceBright / pickled
Forged Billet & Ingot
- Square / Rectangle50 – 600 mm side
- Hexagonal10 – 120 mm A/F
- Ingot weight0.5 – 15 ton
- ConditionForged / ESR refined
Delivery & Packaging
Transparent lead times, clearly defined minimum order quantities, and packaging options designed to protect your material from warehouse to workbench.
Lead Time
7 – 15 Days Stock items and standard sizes. Custom dimensions and large-volume orders (above 10 tons) are produced and delivered within 30 calendar days from order confirmation. Lead time confirmed within 24 hours of inquiry.
Minimum Order Quantity
1 Piece No minimum for in-stock material — we ship from a single bar or plate. Custom production and non-standard dimensions require a minimum of 3 metric tons per order. Sample orders accepted for qualification purposes.
Packaging Options
Three packaging tiers to match your storage conditions and budget: Standard bundled packaging (waterproof film + steel strap) for general shipments; Anti-rust VCI packaging (vapour-corrosion inhibitor film) for long sea transit; Bright-surface wooden-case packaging for ground or precision-machined material requiring zero surface damage.
Manufacturing Capability
An integrated, vertically controlled process chain — from primary melting to finished inspection — ensures each batch of special austenitic stainless steel meets exacting dimensional and metallurgical tolerances.
Step 01
Primary Melting
EAF 30/50/60t
LF 30/60t
Step 02
Refining & Degassing
VD / VOD 30/60t
Ultra-low C & N control
Step 03
Remelting
ESR 1–15t / PESR 6–30t
VIM 0.5–12t / VAR 3–12t
Step 04
Forging
4,500t / 8,000t press
GFM 1,800t / 2,700t
Step 05
Rolling
250 / 350 / 550 / 850
rolling mills
Step 06
Heat Treatment
Solution annealing
Controlled atmosphere
Step 07
Finishing
Turning, grinding
Straightening, cutting
Step 08
Inspection & Dispatch
UT / PMI / hardness
MTC issued per batch
Melting & Remelting Equipment
- ■Electric Arc Furnace (EAF): 30t, 50t, 60t — primary scrap and virgin charge melting
- ■Ladle Furnace (LF): 30t, 60t — precise alloy trimming and temperature homogenization
- ■Vacuum Degassing / VOD: 30t, 60t — removes hydrogen and controls carbon to ultra-low levels (<0.02%)
- ■Vacuum Induction Melting (VIM): 0.5t, 1t, 3t, 8t, 12t — cleanest charge for critical aerospace and nuclear grades
- ■Electroslag Remelting (ESR / PESR): 1–15t / 6–30t — eliminates segregation and non-metallic inclusions
- ■Vacuum Arc Remelting (VAR): 3t, 8t, 12t — directional solidification for maximum homogeneity
Forming, Inspection & Quality Control
- ■Hydraulic press: 4,500t and 8,000t — open-die forging of large ingots and billets up to 15t
- ■Precision forging (GFM): 1,800t and 2,700t — tight dimensional tolerance on round and flat bars
- ■Rolling mills: 250, 350, 550, 850 — full range of bar, rod, and plate rolling
- ■Ultrasonic Testing (UT) — 100% volumetric inspection per ASTM A388 / EN 10308
- ■PMI (Positive Material Identification) — grade and heat verification on finished product
- ■Hardness, tensile, impact (Charpy V-notch), and IGC (intergranular corrosion) testing in-house
Industry Applications for Special Austenitic Stainless Steel
These specialist grades are designed for environments where standard 304 or 316 fall short. Each application segment identifies the recommended grades and the critical performance advantage they deliver.
Aerospace & Defense
Nitronic 50 (XM-19) ■ 347H ■ 347HFG
High-strength Nitronic 50 is specified for aircraft fasteners, hydraulic actuator shafts, and cryogenic fuel handling where weight reduction and corrosion resistance are equally critical. Stabilized 347H and 347HFG supply combustion liner and exhaust duct components with the long-term creep life required by engine certification programs.
Chemical Processing & Petrochemicals
310MoLN ■ 316LN ■ 316Nb ■ 316LMo
310MoLN's ultra-low carbon and high Cr-Ni-Mo content handles the most aggressive media in urea synthesis columns and nitric acid plants where standard 316L degrades rapidly. 316Nb eliminates sensitization risk in welded heat exchanger assemblies. 316LMo (EN 1.4435) provides extra pitting resistance in chlorinated process streams.
Power Generation & Nuclear
347H ■ 347HFG ■ 316LN ■ 316Nb
347HFG delivers the maximum creep rupture strength demanded by ultra-supercritical steam turbine manufacturers. 347H is the widely accepted material for superheater and reheater tubing per ASTM A213/A376. 316LN structural components meet nuclear construction codes (RCC-MRx, ASME Section III) with its strength advantage over standard 316L.
Marine & Oil & Gas
Nitronic 50 (XM-19) ■ 316LN ■ 316LMo
Nitronic 50's PREN exceeding 38 and high strength make it the material of choice for propeller shafts, tiller pins, and subsea fasteners in continuous seawater immersion. 316LMo's elevated Mo content withstands the elevated chloride concentrations found in subsea wellhead equipment and offshore structural fittings.
Pharmaceutical & Food Processing
316LMo (1.4435) ■ 316LN ■ 304LN
EN 1.4435 (316LMo) is the European pharmaceutical industry's default material for API reactors, transfer piping, and CIP systems — its elevated Ni and Mo minimise pitting in saline cleaning solutions. 304LN provides the structural strength for large pressure vessels and storage tanks at lower material cost where Mo is not required.
Thermal Processing & Furnace Equipment
253MA (S30815) ■ 347H
253MA's cerium-enhanced oxide scale provides exceptional resistance to cyclic oxidation up to 1100°C, making it the first-choice material for radiant tubes, furnace rollers, burner nozzles, and heat-treatment fixtures. It offers a significant cost advantage over high-nickel superalloys for components not requiring creep strength above 900°C.
Our technical engineers will review your operating conditions and recommend the optimal special austenitic stainless steel grade — free of charge.
Quality Assurance
Every batch is traceable from raw charge to finished product. Our quality framework exceeds the requirements of most international procurement specifications.
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Mill Test Certificate — EN 10204 3.1 or 3.2
Every shipment is accompanied by a MTC issued in accordance with EN 10204 3.1 (manufacturer-certified) or 3.2 (third-party countersigned). The certificate states chemical analysis, mechanical test results, heat number, and applicable standard.
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Third-Party Inspection — SGS & Bureau Veritas
Independent inspection by SGS or Bureau Veritas is available at any stage of production or pre-shipment. Inspection scope is customisable: chemical check, dimensional survey, visual inspection, or full mechanical test witnessing.
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Full Heat & Batch Traceability
Every bar, plate, and coil is stamped or tagged with a unique heat number. Our system stores and retrieves the complete production record: original melt chemistry, refining parameters, forge/roll schedule, heat treatment log, and final test report.
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Non-Destructive Testing (UT / PMI / Hardness)
100% ultrasonic testing (UT) is standard on forged bars above 50 mm diameter per ASTM A388 / EN 10308. Positive Material Identification (PMI) by X-ray fluorescence is offered on all critical grades. Brinell and Rockwell hardness verification confirms heat treatment condition on each batch.
Trusted by Global Buyers Across 52+ Countries
52+
Export Destinations
20+
Years Established
400+
Specialists On-Site
100Kt
Annual Output (tons)
The 347HFG bars arrived with full MTC and dimensional report. Our metallurgist confirmed chemistry compliance with the EN 1.4988 requirement on first inspection — no re-testing required. Lead time was exactly as promised.
Procurement Engineer
European Power Generation OEM
We switched our offshore shaft specification to Nitronic 50 based on Fushun's recommendation. The corrosion performance improvement in our tidal environment exceeded expectations, and the supply has been consistent over three years.
Senior Materials Engineer
Marine & Offshore Equipment Manufacturer
253MA furnace rollers supplied by Fushun Metal have consistently outperformed our previous grade in cyclic oxidation service at 1050°C. The batch-to-batch consistency in cerium content is particularly impressive.
Process Metallurgist
Industrial Thermal Processing Equipment
Frequently Asked Questions — Special Austenitic Stainless Steel
What is the difference between 304LN and standard 304L stainless steel?
304LN is a nitrogen-enhanced variant of 304L. The controlled nitrogen addition (0.10–0.16 wt%) raises minimum yield strength from approximately 170 MPa (typical 304L) to 205 MPa, without any penalty to weldability, toughness, or intergranular corrosion resistance. This makes 304LN the preferred special austenitic stainless steel for pressure vessels and cryogenic storage tanks where the higher strength allows engineers to design thinner walls and reduce total weight. For structural code compliance, 304LN is listed separately in ASME VIII and EN 13445.
Is Nitronic 50 (XM-19) suitable for seawater and chloride environments?
Yes — and this is one of Nitronic 50's primary design advantages. UNS S20910 achieves a Pitting Resistance Equivalent Number (PREN = %Cr + 3.3×%Mo + 16×%N) typically above 38, compared to approximately 25 for standard 316L. This substantially superior localised corrosion resistance makes it the standard choice for marine propeller shafts, rudder pintles, pump shafts, and offshore subsea fasteners in direct seawater contact. Its non-magnetic behaviour is an additional advantage in MRI and sensitive electronic installations.
What certifications and documentation come with your special austenitic stainless steel?
Standard documentation with every order includes: a Mill Test Certificate (MTC) per EN 10204 3.1 (manufacturer-authorised) or 3.2 (third-party countersigned), chemical analysis by optical emission spectrometry (OES), mechanical test report (tensile and hardness), heat treatment record, unique heat number stamped on material, and a packing list with country of origin declaration. Additional documents available on request: third-party inspection report (SGS or Bureau Veritas), ultrasonic test report, PMI report, and NACE MR0175 compliance statement for sour-service grades.
Can you supply custom dimensions, cut-to-length bars, or rough-machined blanks?
Yes. Our in-house capability covers cut-to-length sawing, rough turning, and precision cylindrical grinding. Round bars are available in diameters from 6 mm to 800 mm and lengths up to 6,000 mm. Custom plate and flat bar dimensions are accepted. For special austenitic stainless steel grades with long production cycles (e.g., 310MoLN, 253MA), please contact us early to discuss scheduling. The minimum order quantity for custom production is 3 metric tons; in-stock standard sizes can be ordered from a single piece.
What is the typical lead time for 347HFG, and how is availability confirmed?
347HFG (EN 1.4988) is a specialist grade primarily produced to order. For in-stock sizes, delivery is within 7–15 business days ex-works Changsha. For custom dimensions or orders above 10 metric tons, production lead time is approximately 30 calendar days from confirmed purchase order. We will confirm exact stock levels, available dimensions, and delivery schedule within 24 hours of receiving your inquiry — no waiting for weekly stock reports.
What makes 253MA superior to other heat-resistant austenitic grades like 310S?
253MA (UNS S30815) differentiates itself through a unique combination of three elements: silicon (1.40–2.00%), nitrogen (0.14–0.20%), and rare-earth cerium (0.03–0.08%). Cerium preferentially segregates to the oxide layer and acts as a strong oxide former, creating a thin, exceptionally adherent, and self-healing protective scale that drastically reduces oxidation rates at temperatures up to 1100°C. Conventional 310S relies on chromium and nickel alone and cannot match this scale stability under cyclic thermal conditions. For furnace fixtures, radiant tubes, and burner components operating in the 900–1100°C range, 253MA delivers a significantly longer service life than 310S at a fraction of the cost of nickel-base superalloys.
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