EN 10090 Grade X45CrSi9-3 quenched and tempered (+QT)

EN 10090 Grade X45CrSi9-3 quenched and tempered (+QT) introduction

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

Equivalent material: GB 45Cr9Si3, GB S48045, IS X45Cr9Si3, IS V-8, JIS SUH1, KS STR1, GOST 40Ch9S2, GOST 40Х9С2, SAE HNV3, UNS S65007, DIN 1.4718, DIN X45CrSi9-3, AFNOR Z45CS9, BS 401S45, AISI HNV3, EN 1.4718

EN 10090 Grade X45CrSi9-3 quenched and tempered (+QT) general

Property Temperature Value
Density 20.0 °C Density of 7.7 g/cm³

EN 10090 Grade X45CrSi9-3 quenched and tempered (+QT) thermal

Property Temperature Value Comment
Coefficient of thermal expansion 100.0 °C Coefficient of thermal expansion of 1.09E-5 1/K -
- 300.0 °C Coefficient of thermal expansion of 1.12E-5 1/K -
- 500.0 °C Coefficient of thermal expansion of 1.15E-5 1/K -
- 700.0 °C Coefficient of thermal expansion of 1.18E-5 1/K -
Melting point - Melting point of 1370 - 1530 °C Typical for Martensitic Stainless Steel
Specific heat capacity 20.0 °C Specific heat capacity of 500 J/(kg·K) -
Thermal conductivity 20.0 °C Thermal conductivity of 21 W/(m·K) -

EN 10090 Grade X45CrSi9-3 quenched and tempered (+QT) chemical

Property Value
Carbon Carbon of 0.4 - 0.5 %
Chromium Chromium of 8 - 10 %
Manganese Manganese of 0.6 %
Nickel Nickel of 0.5 %
Phosphorus Phosphorus of 0.04 %
Silicon Silicon of 2.7 - 3.3 %
Sulfur Sulfur of 0.03 %

EN 10090 Grade X45CrSi9-3 quenched and tempered (+QT) electrical

Property Temperature Value Comment
Electrical resistivity 23.0 °C Electrical resistivity of 6E-7 Ω·m Typical for Martensitic Stainless Steel

EN 10090 Grade X45CrSi9-3 quenched and tempered (+QT) mechanical

Property Temperature Value Comment
Elastic modulus 20.0 °C Elastic modulus of 210 GPa -
Elongation 20.0 °C Elongation of 14 % -
Hardness, Brinell 20.0 °C Hardness, Brinell of 266 - 325 [-] -
Poisson's ratio 23.0 °C Poisson's ratio of 0.3 [-] Typical for Martensitic Stainless Steel
Reduction of area 20.0 °C Reduction of area of 40 % -
Shear modulus 23.0 °C Shear modulus of 77 GPa Typical for Martensitic Stainless Steel
Tensile strength 20.0 °C Tensile strength of 900 - 1100 MPa -
- 500.0 °C Tensile strength of 500 MPa -
- 550.0 °C Tensile strength of 360 MPa -
- 600.0 °C Tensile strength of 250 MPa -
- 650.0 °C Tensile strength of 170 MPa -
- 700.0 °C Tensile strength of 110 MPa -
Yield strength Rp0.2 20.0 °C Yield strength Rp0.2 of 700 MPa -
- 500.0 °C Yield strength Rp0.2 of 400 MPa -
- 550.0 °C Yield strength Rp0.2 of 300 MPa -
- 600.0 °C Yield strength Rp0.2 of 240 MPa -
- 650.0 °C Yield strength Rp0.2 of 120 MPa -
- 700.0 °C Yield strength Rp0.2 of 80 MPa -

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