Precision-Cut, Mill-Certified
Martensitic Stainless Steel
Source 15+ grades of martensitic stainless steel direct from a specialist manufacturer with 20+ years of export experience across 52 countries. Every bar, plate, and forged block ships with a full EN 10204 Mill Test Certificate and traceable heat records.
Product Range
Core Martensitic Stainless Steel Grades
Martensitic stainless steel combines iron-chromium alloying with a body-centred tetragonal crystal structure achieved through controlled quench and temper. The result: a uniquely adjustable balance of hardness, tensile strength, and moderate corrosion resistance — all in a weldable, machinable form. The cards below let you match your engineering requirement to the right grade in under 10 seconds.
JIS SUS410 · GOST 12X13
The workhorse of the martensitic family. Low carbon content enables excellent machinability and weldability. Used for pump shafts, valve trim, steam turbine blades, and fasteners where moderate corrosion resistance is sufficient.
JIS SUS420J1 · GOST 20X13
Higher carbon than 410 enables significantly greater hardness after quenching. The universal choice for surgical instruments, cutlery, dental instruments, and precision mould components requiring a sharp, wear-resistant surface.
JIS SUS420J2 · GOST 30X13
Higher carbon content (0.26–0.35%) versus standard 420 delivers elevated as-hardened hardness. Preferred for knife blades, scissors, measuring instruments, and applications where wear resistance takes priority over impact toughness.
JIS SUS431 · GOST 20X17H2
Nickel addition (1.5–2.5%) gives Grade 431 substantially better corrosion resistance and toughness than standard 410/420. The engineered choice for marine propeller shafts, high-strength bolts, pump rods, and NACE MR0175-compliant components.
JIS SUS440C · GOST 105X17M
The highest-carbon, highest-hardness grade in the 440 series. With 0.95–1.20% carbon and 0.40–0.80% molybdenum, it achieves the maximum attainable hardness among martensitic stainless grades — critical for precision ball bearings, valve seats, and cutting tools.
Supermartensitic
Low-carbon supermartensitic grade combining high strength with excellent toughness and stress-corrosion cracking resistance. Standard choice for offshore equipment, downhole tooling, and subsea valve stems operating in sour-service environments.
JIS SUH616 · GOST 15X12BHMФ
A premium heat-resistant martensitic grade alloyed with tungsten, molybdenum, and vanadium. Maintains high creep strength and oxidation resistance in continuous service up to approximately 580°C — the benchmark choice for steam turbine blades and high-temperature fasteners in power generation.
JIS SCS6 · GOST 06X13H4Д
Supermartensitic grade with exceptional impact toughness down to low temperatures. Preferred for large hydraulic turbine runners, pump casings, and marine propeller shafts where a combination of high specific strength, weldability, and corrosion resistance is required.
Have a grade or dimension requirement? Our technical team responds within 24 hours.
▶ Request a Free Quote NowEngineering Data
Technical Specifications
Full cross-referenced chemical composition and mechanical property data for all martensitic stainless steel grades supplied by Fushun Special Steel. Data sources are cited against each table. Contact us for specific grade datasheets in PDF format.
Chemical Composition by International Standard
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| Grade | ASTM / UNS | EN / DIN | JIS | C (%) | Cr (%) | Ni (%) | Mo (%) | Other Elements | Standard Reference |
|---|---|---|---|---|---|---|---|---|---|
| 403 | S40300 | 1.4000 / X7Cr13 | SUS403 | ≤0.08 | 11.5–13.0 | ≤0.60 | — | Si ≤0.5, Mn ≤1.0 | ASTM A276; EN 10088-3 |
| 410 | S41000 | 1.4006 / X12Cr13 | SUS410 | 0.08–0.15 | 11.5–13.5 | ≤0.75 | — | Si ≤1.0, Mn ≤1.0 | ASTM A276; EN 10088-3 |
| 420 | S42000 | 1.4021 / X20Cr13 | SUS420J1 | 0.16–0.25 | 12.0–14.0 | ≤0.75 | — | Si ≤1.0, Mn ≤1.0 | ASTM A276; EN 10088-3 |
| 420J2 | — | 1.4028 / X30Cr13 | SUS420J2 | 0.26–0.35 | 12.0–14.0 | ≤0.75 | — | Si ≤1.0, Mn ≤1.0 | EN 10088-3; JIS G4303 |
| 1.4034 | — | 1.4034 / X46Cr13 | — | 0.43–0.50 | 12.5–14.5 | ≤1.0 | — | Si ≤1.0, Mn ≤1.0 | EN 10088-3 |
| 1.4116 | — | 1.4116 / X50CrMoV15 | — | 0.45–0.55 | 14.0–15.0 | ≤0.75 | 0.50–0.80 | V 0.10–0.20 | EN 10088-3 |
| 431 | S43100 | 1.4057 / X17CrNi16-2 | SUS431 | ≤0.20 | 15.0–17.0 | 1.50–2.50 | — | Si ≤1.0, Mn ≤1.0 | ASTM A276; EN 10088-3 |
| 440A | S44002 | 1.4109 / X70CrMo15 | SUS440A | 0.60–0.75 | 16.0–18.0 | ≤0.75 | 0.40–0.65 | Si ≤1.0, Mn ≤1.0 | ASTM A276; EN 10088-3 |
| 440B | S44003 | 1.4112 / X90CrMo18 | SUS440B | 0.75–0.95 | 16.0–18.0 | ≤0.75 | 0.40–0.80 | Si ≤1.0, Mn ≤1.0 | ASTM A276 |
| 440C | S44004 | 1.4125 / X105CrMo17 | SUS440C | 0.95–1.20 | 16.0–18.0 | ≤0.75 | 0.40–0.80 | Si ≤1.0, Mn ≤1.0 | ASTM A276; EN 10088-3 |
| 1.4313 | S41500 | 1.4313 / X3CrNiMo13-4 | SCS6 | ≤0.05 | 12.0–14.0 | 3.50–4.50 | 0.40–1.00 | Si ≤0.6, Mn ≤1.5 | EN 10088-3 |
| 1.4418 | S41425 | 1.4418 / X4CrNiMo16-5-1 | — | ≤0.05 | 15.0–17.0 | 4.00–6.00 | 0.80–1.50 | Si ≤0.7, Mn ≤1.5 | EN 10088-3 |
| XM-32 | S41041 | 1.4938 / X12CrNiMoV12-3 | — | 0.10–0.14 | 11.0–12.5 | 2.50–3.50 | 1.50–2.00 | V 0.25–0.40 | ASTM A565 |
| 422 | S42200 | 1.4922 / X20CrMoWV12-1 | — | 0.20–0.25 | 11.0–13.0 | 0.50–1.00 | 0.90–1.25 | W 0.90–1.25, V 0.20–0.30 | ASTM A565; EN 10088-3 |
| 616 | S42226 | 1.4935 / X20CrMoWV12-1 | SUH616 | 0.17–0.23 | 11.0–12.5 | ≤0.50 | 0.80–1.20 | W 0.80–1.20, V 0.20–0.35 | ASTM A565; JIS G4311 |
| 1.4923 | — | 1.4923 / X22CrMoV12-1 | — | 0.18–0.24 | 11.0–12.5 | ≤0.80 | 0.80–1.20 | V 0.20–0.35 | EN 10088-3 |
Data sourced from ASTM A276/A565, EN 10088-3, JIS G4303/G4311, and material-specific product standards. Composition ranges are nominal; exact values per the applicable standard govern. Contact us for grade-specific certificates.
Understanding Martensitic Stainless Steel Heat Treatment Conditions
The mechanical properties of martensitic stainless steel are defined almost entirely by heat treatment condition, not just composition. The table below provides reference mechanical property ranges under the most commercially relevant conditions. Values are provided as guidance; certified test results per heat are available on every MTC.
← Swipe left to see full specifications
| Grade | EN / ASTM | Condition | UTS (MPa) | 0.2% YS (MPa) | Elongation (%) | CVN Impact (J) | Hardness | Standard Reference |
|---|---|---|---|---|---|---|---|---|
| 410 | 1.4006 | Annealed | ≥450 | ≥250 | ≥20 | — | ≤200 HB | EN 10088-3 |
| 410 | 1.4006 | Q+T (700°C) | 700–850 | ≥550 | ≥15 | ≥50 | 195–245 HB | EN 10088-3 |
| 420 | 1.4021 | Annealed | ≥650 | ≥420 | ≥15 | — | ≤235 HB | EN 10088-3 |
| 420 | 1.4021 | Hardened + Low Temper | ≥750 | ≥550 | ≥13 | ≥25 | 49–56 HRC | EN 10088-3 |
| 431 | 1.4057 | Q+T | 900–1100 | ≥700 | ≥12 | ≥50 | 26–32 HRC | EN 10088-3 |
| 440C | 1.4125 | Annealed | ≥760 | — | ≥14 | — | ≤269 HB | ASTM A276 |
| 440C | 1.4125 | Hardened (150°C temper) | ≥1900 | — | — | — | 56–58 HRC | ASTM A276 |
| 1.4418 | S41425 | Q+T (Class B) | ≥760 | ≥620 | ≥18 | ≥60 | 22–30 HRC | EN 10088-3 |
| 1.4313 | S41500 | Q+T | ≥760 | ≥620 | ≥15 | ≥80 | 22–28 HRC | EN 10088-3 |
| 616 / SUH616 | 1.4935 | Q+T | ≥930 | ≥790 | ≥15 | — | 27–35 HRC | ASTM A565 |
| 422 | 1.4922 | Q+T | ≥860 | ≥690 | ≥15 | ≥35 | 25–33 HRC | ASTM A565 |
| 1.4923 | X22CrMoV12-1 | Q+T | ≥780 | ≥590 | ≥16 | ≥40 | 24–30 HRC | EN 10088-3 |
Mechanical properties are minimum values per respective standards unless noted as ranges. CVN impact values are at room temperature (20°C) unless otherwise specified. Q+T = Quenched and Tempered. Values for specific tempering temperatures vary; consult MTC or contact our technical team.
Stock & Custom Supply
Available Forms and Dimensions
All martensitic stainless steel products are available in both standard stock dimensions and custom-machined sizes. Specify your exact requirements — diameter, width, thickness, length, and surface condition — and we will confirm feasibility and lead time within one business day.
- Diameter Ø 8 – 800 mm
- Length 1,000 – 6,000 mm
- Condition Hot-rolled / Forged / Ground
- Tolerance h9, h10, h11 or custom
- Width 20 – 650 mm
- Thickness 5 – 200 mm
- Length Up to 6,000 mm
- Condition Hot-rolled / Forged / Milled
- Thickness 8 – 300 mm
- Width 200 – 2,000 mm
- Length Up to 6,000 mm
- Condition Hot-rolled / Forged / Annealed
- Thickness 0.3 – 3.0 mm
- Width Up to 1,250 mm
- Surface 2B, BA, No.4
- Temper Annealed / Half-hard / Hard
- Diameter Ø 5.0 – 22 mm
- Supply form Coil / Straightened
- Condition Annealed / Pickled
- Block Any section to 2,000 kg
- Ring OD Up to 1,500 mm
- Process Open-die / Ring-rolled
Ordering
Delivery and Order Information
Lead Time
7–30 Days7–15 days for stocked grades and standard sizes. Up to 30 days for custom-dimension or specialty-grade production runs, from order confirmation.
Minimum Order Quantity
1 Piece1 piece from stock for urgent or sample requirements. Minimum 3 tonnes for dedicated custom production runs.
Packaging Options
3 OptionsStandard bundled packing; anti-rust oil + plastic wrap; bright-surface wooden case packing for precision-ground material. Exportworthy crates available on request.
Documentation
Full SetCommercial invoice, packing list, bill of lading, country-of-origin certificate, and EN 10204 3.1 MTC are standard. 3.2 certification and NACE compliance documents available upon request.
Incoterms
FlexibleEXW, FOB Guangzhou / Shanghai, CFR, CIF, or DAP to any global port. Payment terms: T/T, LC at sight, or negotiated terms for established accounts.
Quote Response
< 24 HoursOur technical sales team acknowledges all inquiries within 24 hours (Monday–Friday, UTC+8). Formal quotations issued within one business day for standard requests.
Manufacturing
Production Process Chain and Equipment
From raw alloy to finished, inspected, and certified martensitic stainless steel bar or plate — every stage of our process chain is controlled in-house. This single-source accountability eliminates the traceability gaps common in distributor supply chains.
Why ESR-Refined Martensitic Stainless Steel Outperforms Conventional Melt
Electric Arc Furnace (EAF) + LF + VOD
Primary steelmaking uses 30/50/60-tonne EAF and ladle furnace (LF) refining, followed by vacuum oxygen decarburisation (VOD) to control carbon, sulphur, and dissolved gases. This sequence delivers the low residual-element chemistry demanded by aerospace and energy standards.
Electro-Slag Remelting (ESR)
Our 1–15 tonne ESR and 6/12/30-tonne pressure ESR (PESR) units re-melt ingots through a reactive slag that removes non-metallic inclusions and produces a directionally solidified, defect-free microstructure. ESR is mandatory for bearing-grade 440C and all turbine-blade grades.
Vacuum Induction Melting (VIM) + VAR
0.5/1/3/8/12-tonne VIM furnaces produce ultra-clean heats free from nitrogen and hydrogen porosity. Followed by vacuum arc remelting (VAR) for the most demanding aerospace and medical specifications, achieving inclusion ratings per AMS 2300/2303.
GFM Precision Forging + Hydraulic Press
A 1,800/2,700-tonne GFM precision radial forging machine and 4,500/8,000-tonne hydraulic press provide controlled reduction ratios that refine grain structure, eliminate internal segregation, and achieve the forging quality required by ASTM A484 and EN 10250.
Heat Treatment — Full In-House Capability
Annealing, normalising, quenching (oil, water, or air), and multi-stage tempering are all performed in calibrated furnaces. Quench and temper parameters are logged per heat number, with thermocouple records available as part of the MTC package.
Ultrasonic Testing (UT) and Chemical Analysis
100% ultrasonic testing per EN 10228-3 / ASTM A388, hardness verification across the cross-section, and optical emission spectrometry (OES) chemical analysis are performed on every batch before the MTC is issued. No material leaves without passing all acceptance criteria.
End Markets
Industry Applications for Martensitic Stainless Steel
Each end-market segment below has specific grade requirements shaped by service temperature, corrosion environment, regulatory standards, and mechanical loading. If you can identify your application segment, our technical team can recommend the correct grade, heat treatment condition, and dimensional form immediately.
Martensitic Stainless Steel in Aerospace & Defense
Compressor blades, turbine discs, fasteners, actuator rods, and landing gear components in aircraft demand a steel that combines high specific strength with fatigue resistance and resistance to fuel or hydraulic fluid exposure. VIM+VAR-processed martensitic grades meet AMS and AS9100 traceability requirements.
Martensitic Stainless Steel for Oil & Gas
Downhole tools, Christmas tree components, valve stems, and subsea connectors operating in sour-service (H₂S) environments require NACE MR0175 / ISO 15156 compliance. Supermartensitic grades with controlled yield strength and minimum hardness limits prevent sulfide stress cracking in production wells.
Medical and Surgical Instruments
Scalpels, surgical scissors, biopsy forceps, dental curettes, and bone saws require a stainless steel that can be sharpened to a fine edge, autoclaved repeatedly without corrosion, and manufactured to tight dimensional tolerances. The 420 series delivers the combination of high hardness and adequate corrosion resistance for most instrument standards including ISO 7153-1.
Power Generation
Steam turbine blades, rotor discs, tie bolts, and steam valve internals must retain mechanical properties at continuous operating temperatures up to 620°C. Molybdenum- and vanadium-bearing martensitic grades are the internationally standardised solution for both fossil fuel and combined-cycle power plant service.
Pumps, Valves & Rotating Equipment
Pump shafts, impellers, valve bodies, and bearing sleeves operating in mildly corrosive process fluids benefit from the combination of moderate corrosion resistance and high yield strength available in hardened martensitic grades. Large forged rings for hydraulic turbine runners are a core product of our foundry.
Cutlery, Blades & Precision Tools
Kitchen knives, hunting knives, scissors, razor blades, and cutting tool inserts are the dominant volume application for the 420 and 440 series worldwide. The exact grade selection depends on the trade-off between edge retention (favours 440C), corrosion resistance (favours 440A), and cost. We supply all three 440 sub-grades as well as the EN-only 1.4116 knife grade.
Tell us your application — we will select the right martensitic stainless steel grade, confirm availability, and quote within 24 hours.
▶ Get a Free Technical QuoteQuality & Compliance
Quality Assurance and Certification
For a Chinese manufacturer supplying safety-critical components to engineers and procurement managers worldwide, documentation is not paperwork — it is product. Every process step generates traceable records that ship with your material.
EN 10204 Mill Test Certificate
A 3.1 MTC (certified by our works inspector) is issued as standard with every order. The certificate documents chemical composition (heat analysis + product analysis where applicable), mechanical test results, heat number, batch number, and heat treatment records. EN 10204 3.2 (countersigned by an independent inspection body) is available upon request.
Third-Party Inspection Partners
We maintain active working relationships with SGS, Bureau Veritas (BV), and TÜV for independent pre-shipment inspection. If your purchasing policy requires witness testing or third-party sign-off on the MTC, we can accommodate this without extending lead times in most cases. Just specify at the time of order.
Full Heat and Batch Traceability
Every piece is linked back to a unique heat number and production batch. Heat treatment furnace charts, quench bath temperature records, tempering cycle records, and spectrometer printouts are archived for a minimum of 10 years. Retrospective traceability requests are processed within 48 hours.
Dimensional and Non-Destructive Testing
Dimensional inspection is performed to EN 10060 (round bar), EN 10058 (flat bar), or applicable ASTM dimensional standards. Ultrasonic testing (UT) per EN 10228-3 or ASTM A388 is standard for forged bars and blocks above 80 mm diameter. Surface hardness is verified after heat treatment across the cross-section.
Aerospace-Tier Quality System
Our management system aligns with AS9100 requirements for aerospace supply chain documentation, first-article inspection, and configuration management. Customer-specific quality plans and inspection test plans (ITP) are available for project-based orders in aerospace and defence applications.
Packaging and Corrosion Protection
Finished material is protected immediately after final inspection. Options include standard bundled export packing, anti-rust oil and sealed plastic wrapping for oceanic shipping, and solid-board wooden case packing for ground bars. All packaging is ISPM 15 compliant for international phytosanitary requirements.
Client Experience
Client Success Stories
Our martensitic stainless steel products are used in critical applications by engineers and manufacturers across 52 countries. These are representative outcomes from verified customers — client names are withheld under NDA.
"We required Grade 616 / SUH616 turbine blade blanks in a non-standard forged flat bar dimension with EN 10204 3.2 certification countersigned by Bureau Veritas. Fushun confirmed the dimension was achievable within their regular forging capacity, delivered within 28 days, and the MTC was complete and correct on first submission. The chemical analysis matched our AMS specification exactly. We have since placed four repeat orders."
"We source 440C round bars in diameters from 20 mm to 180 mm for precision bearing components. The main issue we faced with previous suppliers was inconsistent hardness distribution across the cross-section after our in-house heat treatment. Since switching to ESR-quality 440C from Fushun, the scatter in hardness test results has fallen dramatically, and our scrap rate on hardened components has been reduced by approximately 70%."
"Our project required 1.4418 (X4CrNiMo16-5-1) in NACE MR0175-compliant condition with hardness ≤ 23 HRC and full PREN documentation. I submitted the inquiry at 9 PM my time and received a detailed technical reply the following morning with the correct grade cross-reference, available stock sizes, and proposed heat treatment condition. That level of engineering responsiveness — from a manufacturer, not a broker — is rare."
Common Questions
Frequently Asked Questions About Martensitic Stainless Steel
Get Pricing
Request a Quote for Martensitic Stainless Steel
Provide your grade, dimensions, quantity, and required standard. Our technically trained sales team will respond with pricing, availability, and MTC options — all within 24 hours on business days.
