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EN 10090 X45CrSi9-3 Quenched & Tempered (QT) – High-Performance Valve Steel

X45CrSi9-3 is a martensitic Cr-Si-alloyed valve steel. The steel shows excellent nitriding and surface hardenability, it is suitable for upsetting. Moderate resistance in exhaust condensate. This applies also to lead compounds at increased temperatures. Tempering resistance at continuous operation up to approx. 700 deg. Use: inlet valves, shanks, valves

Properties

General

PropertyTemperatureValue

Density

20.0 °C

7.7 g/cm³

Mechanical

PropertyTemperatureValueComment

Elastic modulus

20.0 °C

210 GPa

Elongation

20.0 °C

14 %

Hardness, Brinell

20.0 °C

266 - 325 [-]

Poisson's ratio

23.0 °C

0.3 [-]

Typical for Martensitic Stainless Steel

Reduction of area

20.0 °C

40 %

Shear modulus

23.0 °C

77 GPa

Typical for Martensitic Stainless Steel

Tensile strength

20.0 °C

900 - 1100 MPa

500.0 °C

500 MPa

550.0 °C

360 MPa

600.0 °C

250 MPa

650.0 °C

170 MPa

700.0 °C

110 MPa

Yield strength Rp0.2

20.0 °C

700 MPa

500.0 °C

400 MPa

550.0 °C

300 MPa

600.0 °C

240 MPa

650.0 °C

120 MPa

700.0 °C

80 MPa

Thermal

PropertyTemperatureValueComment

Coefficient of thermal expansion

100.0 °C

1.09E-5 1/K

300.0 °C

1.12E-5 1/K

500.0 °C

1.15E-5 1/K

700.0 °C

1.18E-5 1/K

Melting point

1370 - 1530 °C

Typical for Martensitic Stainless Steel

Specific heat capacity

20.0 °C

500 J/(kg·K)

Thermal conductivity

20.0 °C

21 W/(m·K)

Electrical

PropertyTemperatureValueComment

Electrical resistivity

23.0 °C

6E-7 Ω·m

Typical for Martensitic Stainless Steel

Chemical properties

PropertyValue

Carbon

0.4 - 0.5 %

Chromium

8 - 10 %

Manganese

0.6 %

Nickel

0.5 %

Phosphorus

0.04 %

Silicon

2.7 - 3.3 %

Sulfur

0.03 %


Metal

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