What grade of stainless steel is 1.4057?
1.4057 stainless steel is a martensitic grade, also known as AISI 431, Alloy 431, UNS S43100, and SS 2321. It features high tensile strength, excellent torsional strength, and good impact toughness; it is commonly used for drive shafts and propeller shafts, pump and valve components, piston rods, and high-strength fasteners. Regarding heat treatment, it is typically supplied in the quenched and tempered (QT) condition-commonly QT800 or QT900.
What are the standards for 1.4057 stainless steel?
| Grade : | X17CrNi16-2 | ||
| Number: | 1.4057 | ||
| Classification: | Martensitic stainless steel | ||
| Density: | 7.7 g/cm ³ | ||
| Standard: |
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What material is 1.4057 equivalent to?
| EU EN |
USA - |
Germany DIN,WNr |
China GB |
Poland PN |
Russia GOST |
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| X17CrNi16-2 |
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1.4057 Stainless Steel Chemical Composition
| 1.4057 X17CrNi16-2 |
C | Si | Mn | P | S | Cr | Mo | Ni | V |
|---|---|---|---|---|---|---|---|---|---|
| min. | 0,12 | 15,0 | 1,5 | ||||||
| max. | 0,22 | 1,0 | 1,5 | 0,04 | 0,015 | 17,0 | 2,5 |
Mechanical Properties of 1.4057 Stainless Steel
| Delivery condition | Mechanical properties | Temperature | ||||||
| 100℃ | 150℃ | 200℃ | 250℃ | 300℃ | 350℃ | 400℃ | ||
| +QT800 | The yield point, Re (MPa) | >515 | >495 | >475 | >460 | >440 | >405 | >355 |
| +QT900 | The yield point, Re (MPa) | >565 | >525 | >505 | >490 | >470 | >430 | >375 |
1.4057 Stainless Steel Heat treatment
| Temperature in °C | Cooling | |
| Hot forming | 1.100 - 800 | Furnace, slow cooling |
| Heat treatment | ||
| Soft annealing (+ A) | 680 - 800 | Furnace, air |
| Tempering (+ QT) | ||
| Hardening | 950 - 1050 | Oil, air or polymer |
| Annealing QT800 | 750 - 800 + 650 - 700 | Water or air |
| Annealing QT900 | 600 - 650 | Water or air |
Applications of 1.4507 stainless steel:
Drive and propeller shafts
Pump and valve parts
Fasteners, bolts, and nuts
Piston rods and bearings
Chemical and petroleum equipment
How is the corrosion resistance of 1.4057 stainless steel?
Among all martensitic stainless steels (400 series), 1.4057 offers some of the best corrosion resistance. It withstands corrosion from fresh water, marine atmospheres, and certain chemicals (such as weak acids and oxidizing acids). However, its corrosion resistance remains inferior to that of austenitic stainless steels (like 304 or 316L), and it is not recommended for use in extremely acidic or high-chloride environments.
Can 1.4057 stainless steel be welded?
Its weldability is relatively poor. Due to its high carbon content and tendency to harden, it is highly susceptible to cold cracking during welding. If welding is necessary, preheating to 200°C–300°C is required, and post-weld annealing must be performed immediately to relieve stress. It is generally recommended to use welding consumables that match the base metal or austenitic consumables (such as 308L or 309L, though the latter may reduce weld strength).
Is 1.4057 magnetic?
Yes. 1.4057 has a martensitic structure and exhibits strong ferromagnetism (it is attracted to magnets) in both annealed and heat-treated states.
What is the difference between 1.4057 and 1.4021 (AISI 420)?
1.4057 contains 1.5–2.5% nickel, whereas 1.4021 contains almost no nickel. Thanks to its higher chromium and nickel content, 1.4057 offers significantly better corrosion resistance than 1.4021. The addition of nickel also gives 1.4057 superior low-temperature impact toughness compared to 1.4021.
Manufacturer of 1.4057 / AISI 431 Stainless Steel Plate and Bar
All our 1.4057 materials are sourced from top-tier mills with full MTC (Material Test Certificate) according to EN 10204 3.1. We ensure 100% traceability from raw material to finished product.
We maintain a large inventory of standard sizes for round bars and plates, enabling us to offer short lead times (within 3-7 days) for urgent projects.
Every piece undergoes rigorous inspection, including UT (Ultrasonic Testing) to ensure no internal defects and PMI (Positive Material Identification) to verify chemical composition before shipment.
Specifications for 1.4057 / AISI 431 Stainless Steel Plate and Bar
| Product Form | Size Range (mm) | Surface Finish | Delivery Condition |
| Round Bar | Diameter: 5.0mm – 600mm | Black, Peeled, Polished, Ground | Annealed / QT800 / QT900 |
| Flat Bar | Thickness: 5mm – 120mm Width: 20mm – 500mm |
Black, Pickled, Sand-blasted | Quenched & Tempered (QT) |
| Square/Hex Bar | Size: 10mm – 150mm | Bright, Cold Drawn, Polished | Annealed / QT Condition |
| Plate / Sheet | Thickness: 0.5mm – 100mm Width: Up to 2500mm |
No.1, 2B, Polished | Annealed / QT800 |
| Forged Blocks |
Custom sizes up to 20 tons |
Rough Machined | Quenched & Tempered |
Additional services
Precision Cutting: CNC Sawing for bars and Laser/Plasma/Water-jet cutting for plates.
Surface Processing: Centerless grinding, polishing (Mirror/Satin), and sand-blasting.
Testing & Inspection: Ultrasonic Testing (UT), MPI, Chemical Analysis, and Mechanical Property Testing.
If you have project requirements for 1.4507 stainless steel bars and plates, we welcome your orders. GNEE maintains a large inventory of popular products for you to choose from. Please contact our factory today; we offer competitive prices and excellent service.Mail:es@gescosteel.com