DIN 17240 Grade 24CrMo5 quenched and tempered (+QT)
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DIN 17240 Grade 24CrMo5 quenched and tempered (+QT)

DIN 17240 Grade 24CrMo5 quenched and tempered (+QT) introduction

High temperature steel for screws and nuts in the chemical industry as well as for forgings in the steam turbine construction up to 530 °C.

Equivalent material: AFNOR 25CD4, BS 708A25, GOST 30ChM, ISO F31, JIS SCM822, ÖNORM 24CrMo5SW, PN 25HM, SS 2225, AISI 4130, DIN 1.7258, JIS SCM24H, JIS SCM822TK, JIS SCM822HRCH, JIS SCM822RCH, JIS SCM822WCH, JIS SCM822H, EN 24CrMo5, EN 1.7258

DIN 17240 Grade 24CrMo5 quenched and tempered (+QT) general

Property Temperature Value
Density 20.0 °C Density of 7.83 g/cm³

DIN 17240 Grade 24CrMo5 quenched and tempered (+QT) thermal

Property Temperature Value Comment
Coefficient of thermal expansion -100.0 °C Coefficient of thermal expansion of 1.05E-5 1/K -
- 20.0 °C Coefficient of thermal expansion of 1.15E-5 1/K -
- 100.0 °C Coefficient of thermal expansion of 1.11E-5 - 1.21E-5 1/K -
- 200.0 °C Coefficient of thermal expansion of 1.21E-5 - 1.27E-5 1/K -
- 300.0 °C Coefficient of thermal expansion of 1.29E-5 - 1.32E-5 1/K -
- 400.0 °C Coefficient of thermal expansion of 1.35E-5 - 1.36E-5 1/K -
- 500.0 °C Coefficient of thermal expansion of 1.39E-5 - 1.4E-5 1/K -
- 600.0 °C Coefficient of thermal expansion of 1.41E-5 - 1.44E-5 1/K -
Max service temperature, long - Max service temperature, long of 0 - 530 °C -
Melting point - Melting point of 1382 - 1529 °C Typical for Chromium Molybdenum Steel
Specific heat capacity -100.0 °C Specific heat capacity of 423 J/(kg·K) -
- 20.0 °C Specific heat capacity of 461 J/(kg·K) -
- 100.0 °C Specific heat capacity of 479 J/(kg·K) -
- 200.0 °C Specific heat capacity of 499 J/(kg·K) -
- 300.0 °C Specific heat capacity of 517 J/(kg·K) -
- 400.0 °C Specific heat capacity of 536 J/(kg·K) -
- 500.0 °C Specific heat capacity of 558 J/(kg·K) -
- 600.0 °C Specific heat capacity of 587 J/(kg·K) -
Thermal conductivity 20.0 °C Thermal conductivity of 41 W/(m·K) -
- 100.0 °C Thermal conductivity of 42.7 W/(m·K) -
- 200.0 °C Thermal conductivity of 42.8 W/(m·K) -
- 300.0 °C Thermal conductivity of 41.6 W/(m·K) -
- 400.0 °C Thermal conductivity of 39.9 W/(m·K) -
- 500.0 °C Thermal conductivity of 37.8 W/(m·K) -
- 600.0 °C Thermal conductivity of 35.6 W/(m·K) -
Thermal diffusivity 20.0 °C Thermal diffusivity of 11.4 mm²/s -
- 100.0 °C Thermal diffusivity of 11 mm²/s -
- 200.0 °C Thermal diffusivity of 10.3 mm²/s -
- 300.0 °C Thermal diffusivity of 9.5 mm²/s -
- 400.0 °C Thermal diffusivity of 8.5 mm²/s -
- 500.0 °C Thermal diffusivity of 7.3 mm²/s -
- 600.0 °C Thermal diffusivity of 6 mm²/s -

DIN 17240 Grade 24CrMo5 quenched and tempered (+QT) chemical

Property Value
Carbon Carbon of 0.2 - 0.28 %
Chromium Chromium of 0.9 - 1.2 %
Manganese Manganese of 0.5 - 0.8 %
Molybdenum Molybdenum of 0.2 - 0.35 %
Nickel Nickel of 0.6 %
Phosphorus Phosphorus of 0.04 %
Silicon Silicon of 0.4 %
Sulfur Sulfur of 0.035 %

DIN 17240 Grade 24CrMo5 quenched and tempered (+QT) electrical

Property Temperature Value
Electrical resistivity 20.0 °C Electrical resistivity of 2.54E-7 Ω·m
- 100.0 °C Electrical resistivity of 3E-7 Ω·m
- 200.0 °C Electrical resistivity of 3.69E-7 Ω·m
- 300.0 °C Electrical resistivity of 4.51E-7 Ω·m
- 400.0 °C Electrical resistivity of 5.45E-7 Ω·m
- 500.0 °C Electrical resistivity of 6.54E-7 Ω·m
- 600.0 °C Electrical resistivity of 7.78E-7 Ω·m

DIN 17240 Grade 24CrMo5 quenched and tempered (+QT) mechanical

Property Temperature Value Comment
Elastic modulus -100.0 °C Elastic modulus of 217 GPa -
- 20.0 °C Elastic modulus of 212 GPa -
- 100.0 °C Elastic modulus of 204 - 207 GPa -
- 200.0 °C Elastic modulus of 196 - 199 GPa -
- 300.0 °C Elastic modulus of 186 - 192 GPa -
- 400.0 °C Elastic modulus of 177 - 184 GPa -
- 500.0 °C Elastic modulus of 164 - 175 GPa -
- 600.0 °C Elastic modulus of 127 - 164 GPa -
Elongation 20.0 °C Elongation of 18 % -
Poisson's ratio 23.0 °C Poisson's ratio of 0.29 [-] Typical for Chromium Molybdenum Steel
Reduction of area 20.0 °C Reduction of area of 60 % -
Tensile strength 20.0 °C Tensile strength of 600 - 750 MPa -
- 300.0 °C Tensile strength of 460 MPa -
- 350.0 °C Tensile strength of 440 MPa -
Yield strength Rp0.2 20.0 °C Yield strength Rp0.2 of 420 - 440 MPa -
- 200.0 °C Yield strength Rp0.2 of 382 - 412 MPa -
- 250.0 °C Yield strength Rp0.2 of 372 - 392 MPa -
- 300.0 °C Yield strength Rp0.2 of 344 - 363 MPa -
- 350.0 °C Yield strength Rp0.2 of 324 - 333 MPa -
- 400.0 °C Yield strength Rp0.2 of 294 - 304 MPa -
- 450.0 °C Yield strength Rp0.2 of 265 - 275 MPa -
- 500.0 °C Yield strength Rp0.2 of 226 - 235 MPa -

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