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