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DIN 17480 Grade X45 CrNiW 18-9: Heat‑Treated & Precipitation Hardened Valve Steel for High‑Temperature Applications

X45CrNiW18-9 is an austenitic Cr-Ni-W-alloyed valve steel. The steel shows sufficient corrosion resistance in exhaust condensate and good resistance to lead compounds at increased temperatures. Application at operating temperatures up to 730 deg. Use: exhaust valves, valves

Properties

General

PropertyTemperatureValue

Density

20.0 °C

7.9 g/cm³

Mechanical

PropertyTemperatureValueComment

Elastic modulus

20.0 °C

205 GPa

Poisson's ratio

23.0 °C

0.3 [-]

Typical for Austenitic Stainless Steel

Shear modulus

23.0 °C

77 GPa

Typical for Austenitic Stainless Steel

Tensile strength

500.0 °C

600 MPa

550.0 °C

550 MPa

600.0 °C

500 MPa

650.0 °C

410 MPa

700.0 °C

350 MPa

750.0 °C

270 MPa

800.0 °C

180 MPa

Yield strength Rp0.2

500.0 °C

250 MPa

550.0 °C

230 MPa

600.0 °C

210 MPa

650.0 °C

190 MPa

700.0 °C

170 MPa

750.0 °C

140 MPa

800.0 °C

100 MPa

Thermal

PropertyTemperatureValueComment

Coefficient of thermal expansion

100.0 °C

1.55E-5 1/K

300.0 °C

1.75E-5 1/K

500.0 °C

1.82E-5 1/K

700.0 °C

1.86E-5 1/K

Max service temperature, long

0 - 730 °C

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

PropertyTemperatureValueComment

Electrical resistivity

23.0 °C

8.5E-7 Ω·m

Typical for Austenitic Stainless Steel

Chemical properties

PropertyValue

Carbon

0.4 - 0.5 %

Chromium

17 - 19 %

Manganese

0.8 - 1.5 %

Nickel

8 - 10 %

Phosphorus

0.05 %

Silicon

2 - 3 %

Sulfur

0.03 %

Tungsten

0.8 - 1.2 %


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