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Discover the high-strength corrosion-resistant 1.4057 AISI 431 X17CrNi16-2 martensitic stainless steel ideal for industrial applications.

What is 1.4057 AISI 431 X17CrNi16-2

1.4057, also known as AISI 431 or X17CrNi16-2, is a type of martensitic stainless steel widely used in industries requiring both strength and corrosion resistance. This steel grade is part of the AISI 400 series, known for its high hardness and good mechanical properties after heat treatment. The “martensitic” nature means it can be hardened by heating and rapid cooling, making it ideal for applications where durability matters.

Material Composition and Standards

The composition of 1.4057 stainless steel typically includes:

Chromium (Cr): Around 16-18%, providing corrosion resistance and hardness.
Nickel (Ni): About 1-2%, enhancing toughness and stability.
Carbon (C): Approximately 0.15-0.22%, enabling excellent hardenability.
Other Elements: Small amounts of manganese, silicon, and sometimes molybdenum for added strength and corrosion resistance.

This material is standardized under EN 10088 and ASTM equivalents, ensuring consistent quality and performance worldwide. The X17CrNi16-2 designation reflects the chemical makeup—17% chromium and about 2% nickel.

Key Characteristics

High Strength: Achieved through heat treatment, 1.4057 offers excellent tensile and yield strength.
Good Corrosion Resistance: Particularly in mildly corrosive environments like freshwater or slightly acidic conditions.
Machinability: Better than many other martensitic stainless steels but still requires careful processing.
Magnetic: As a martensitic steel, it shows magnetic properties, useful in certain mechanical applications.
Wear Resistance: Suitable for parts prone to friction and wear thanks to its hardenable microstructure.

Understanding these fundamentals sets the stage for exploring why 1.4057 AISI 431 fits so well in demanding industrial roles and how it stacks up against similar materials.

Mechanical and Physical Properties

1.4057 (AISI 431 / X17CrNi16-2) is a martensitic stainless steel known for its strong mechanical and physical traits. It offers high tensile strength, typically around 700-850 MPa, with excellent hardness ranging from 50 to 55 HRC after heat treatment. Its density is about 7.7 g/cm³, making it solid yet workable for various industrial applications.

Strength and Durability

This steel excels in strength and durability, thanks to its martensitic structure. It’s resistant to wear and fatigue, making it great for parts that face mechanical stress. With proper heat treatment, 1.4057 can maintain toughness and avoid brittleness—key for US manufacturing environments needing reliable, long-lasting materials.

Corrosion Resistance

Although not as corrosion-resistant as austenitic stainless steels, 1.4057 delivers good resistance against moderate corrosion. Its chromium content (around 16-17%) helps protect against rust from moisture and mild chemical exposure. This makes it suitable for outdoor tools, turbines, and marine components where moderate corrosion is expected.

Thermal and Magnetic Properties

Thermally, AISI 431 can handle temperatures up to 600°F (315°C) without losing its mechanical properties, which is useful in industrial heaters and valves. It’s magnetic due to its martensitic phase, so it’s easy to detect and manipulate in manufacturing processes where magnetic response is a factor.

For more on heat treatment, check out our guide on stainless steel heat treatment processes, ideal for optimizing 1.4057’s performance.

Applications of 1.4057 AISI 431 X17CrNi16-2

Industrial Uses

1.4057, also known as AISI 431 or X17CrNi16-2, is a popular choice in many industries because of its strong mix of properties. You’ll often find it used in:

Pump and valve components — where strength and corrosion resistance are crucial
Aerospace parts — thanks to its durability and heat resistance
Automotive parts — such as shafts, fasteners, and turbocharger components
Cutlery and surgical instruments — due to its hardness and ability to hold a sharp edge
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Comparable or slightly higher mechanical strength after proper heat treatment
More consistent machinability and weldability, making it easier to work with in manufacturing

That said, if your project requires extreme corrosion resistance (e.g., marine environments), other stainless types like austenitic grades might be better. But for general industrial purposes where toughness and moderate corrosion protection are needed, 1.4057 is often the smarter pick.

Manufacturing and Processing 1.4057 Stainless Steel

Heat Treatment Processes

1.4057 (AISI 431 / X17CrNi16-2) is a martensitic stainless steel that responds well to heat treatment. This process is key to unlocking its high strength and hardness. Typically, the steel is:

Annealed at around 1,040°C (1,900°F) to soften the material for easier machining.
Hardened by heating to 980–1,020°C (1,800–1,860°F), followed by rapid quenching, usually in oil or air.
Tempered by reheating between 150–370°C (300–700°F) to balance hardness with toughness.

Proper heat treatment boosts mechanical properties and ensures the corrosion resistance of AISI 431.

Machinability and Weldability

Machining 1.4057 stainless steel is generally good when annealed, but becomes tougher after hardening. Here’s what you need to know:

Use sharp tools and slower cutting speeds during machining.
Avoid overheating to prevent work hardening.
Weldability is moderate; preheating and post-weld heat treatment are recommended to avoid cracking and maintain corrosion resistance.
Common welding techniques like TIG and MIG work well with proper precautions.

Quality Assurance with Vast

At Vast, we make sure every batch of 1.4057 stainless steel meets strict quality standards. Our process includes:

Material testing to confirm chemical composition and mechanical properties.
Non-destructive testing to catch any imperfections before delivery.
Traceability from raw material to finished product.

Choosing Vast means you get reliable 1.4057 steel that’s ready to perform in demanding US industrial applications.

Benefits of Choosing Vast for 1.4057 Stainless Steel

When it comes to sourcing 1.4057 (AISI 431 / X17CrNi16-2) martensitic stainless steel, Vast stands out as a trusted supplier in the US market. Here’s why picking Vast makes a difference:

High-Quality MaterialVast supplies 1.4057 steel that meets strict standards and guarantees consistent chemical composition and mechanical properties. You get reliable AISI 431 stainless steel every time.
Extensive InventoryNeed quick turnaround? Vast maintains a broad stock of X17CrNi16-2 in various forms and sizes, making it easy to find exactly what your project demands without long waits.
Expert SupportVast’s team understands the unique needs of industries using martensitic stainless steel. They offer valuable advice on heat treatment, machining, or welding, ensuring you optimize material performance.
Competitive PricingBecause Vast works closely with mills and manufacturers, they offer cost-effective pricing on 1.4057 steel without sacrificing quality—helping your bottom line.
Reliable DeliveryWith efficient logistics and local presence, Vast provides timely shipping to meet tight project schedules anywhere in the US.

Choosing Vast means you’re not just getting 1.4057 stainless steel—you’re gaining a partner who supports your whole manufacturing process with quality, knowledge, and service.

FAQs About 1.4057 AISI 431 X17CrNi16-2

What is 1.4057 AISI 431 (X17CrNi16-2) stainless steel?

It’s a martensitic stainless steel known for its high strength, good corrosion resistance, and excellent wear resistance. It’s often used where toughness and moderate corrosion resistance are needed.