EN 10090 X55CrMnNiN20-8 Valve Steel – Solution Heat‑Treated & Precipitation Hardened (+AT+P)
X55CrMnNiN20-8 is an austenitic Cr-Mn-Ni-N-alloyed valve steel. The steel shows high corrosion resistance in exhaust condensate and to lead compounds at increased temperatures. Use: inlet valves, exhaust valves, valves
Properties
General
| Property | Temperature | Value |
|---|---|---|
Density | 20.0 °C | 7.8 g/cm³ |
Mechanical
| Property | Temperature | Value | Comment |
|---|---|---|---|
Elastic modulus | 20.0 °C | 205 GPa | |
Elongation | 20.0 °C | 8 % | |
Hardness, Rockwell C | 20.0 °C | 28 [-] | |
Poisson's ratio | 23.0 °C | 0.3 [-] | Typical for Austenitic Stainless Steel |
Reduction of area | 20.0 °C | 10 % | |
Shear modulus | 23.0 °C | 77 GPa | Typical for Austenitic Stainless Steel |
Tensile strength | 20.0 °C | 900 - 1150 MPa | |
500.0 °C | 640 MPa | ||
550.0 °C | 590 MPa | ||
600.0 °C | 540 MPa | ||
650.0 °C | 490 MPa | ||
700.0 °C | 440 MPa | ||
750.0 °C | 360 MPa | ||
800.0 °C | 290 MPa | ||
Yield strength Rp0.2 | 20.0 °C | 550 MPa | |
500.0 °C | 300 MPa | ||
550.0 °C | 280 MPa | ||
600.0 °C | 250 MPa | ||
650.0 °C | 230 MPa | ||
700.0 °C | 220 MPa | ||
750.0 °C | 200 MPa | ||
800.0 °C | 170 MPa | ||
Thermal
| Property | Temperature | Value | Comment |
|---|---|---|---|
Coefficient of thermal expansion | 100.0 °C | 1.55E-5 1/K | |
300.0 °C | 1.75E-5 1/K | ||
500.0 °C | 1.85E-5 1/K | ||
700.0 °C | 1.88E-5 1/K | ||
Melting point | 1230 - 1480 °C | Typical for Austenitic Stainless Steel | |
Specific heat capacity | 20.0 °C | 500 J/(kg·K) | |
Thermal conductivity | 20.0 °C | 14.5 W/(m·K) | |
Electrical
| Property | Temperature | Value | Comment |
|---|---|---|---|
Electrical resistivity | 23.0 °C | 8.5E-7 Ω·m | Typical for Austenitic Stainless Steel |
Chemical properties
| Property | Value |
|---|---|
Carbon | 0.5 - 0.6 % |
Chromium | 19.5 - 21.5 % |
Manganese | 7 - 10 % |
Nickel | 1.5 - 2.75 % |
Nitrogen | 0.2 - 0.4 % |
Phosphorus | 0.05 % |
Silicon | 0.25 % |
Sulfur | 0.03 % |
Metal
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