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1.4057 stainless steel

Martensitic chromium stainless QT steel (1.4057)

Code

X17CrNi16-2

US standard (AISI)

431

Composition

Alloying components [%]

C: 0.12 - 0.22

Cr: 15.00 - 17.00

Mn: 0 - 1.50

Ni: 1.5 - 2.5

P: 0 - 0.04

S: 0 - 0.015 (0.030*)

Si: 0 - 1.00

Remainder: Fe

Stainless steel grade

C3

Density [g/cm³]

7.7

Yield point

Rp0.2 [N/mm²]

≥600

Tensile strength

Rm [N/mm²]

≤950
 

Corrosion resistance

- Good
- Best resistance within the group of materials classed as martensitic stainless steels, but also susceptible to intergranular corrosion

Machinability

Poor

Weldability

Good

Other properties

- Nickel-free martensitic ferromagnetic structure with high tenacity
- The steel is usually tempered (Rm = 1400 N/mm²/Rp0.2 = 1200 N/mm²)
- Can be mechanically polished to a mirror finish
- Suitability for electropolishing: good
- For use in the temperature range -40° - 400°C

Main uses

Machine and structural parts that are subject to high levels of mechanical stress in the food, petrochemistry, seafaring, automotive, aviation or chemical industries:
- Pump parts
- Helical and turbine blades
- Compressor wheels
- Piston rods
- Shafts
- Valve cones