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Martensitic chromium stainless QT steel (1.4057)
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Code
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X17CrNi16-2
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US standard (AISI)
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431
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Composition
Alloying components [%]
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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
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Stainless steel grade
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C3
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Density [g/cm³]
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7.7
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Yield point
Rp0.2 [N/mm²]
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≥600
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Tensile strength
Rm [N/mm²]
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≤950
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Corrosion resistance
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- Good
- Best resistance within the group of materials classed as martensitic stainless steels, but also susceptible to intergranular corrosion |
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Machinability
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Poor
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Weldability
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Good
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Other properties
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- 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 |
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Main uses
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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 |
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