EN 10085 Grade 31CrMoV9 quenched and tempered (+QT)
EN 10085 Grade 31CrMoV9 quenched and tempered (+QT) introduction
The nitriding steel 31 CrMoV 9 can undergo quenchhardening and is used for parts for hot steam fittings, valve spindles, crank shafts, and similarly stressed wear parts that have a dimension of up to 100 mm.
The steel contains a nitride agent (Cr) which contributes through the nitriding process or the nitro-carburization process with N or N and C to a higher:
- case hardness
- abrasion resistance
- fatigue strength
and
- corrosion resistance.
It is used for forged construction components: quench-hardened, mechanically processed and treated thermo-chemically (for example nitriding).
Equivalent material: UNI 31CrMoV10, UNE F.1721-31CrMoV10, DIN 1.8519, EN 31CrMoV9, EN 1.8519
EN 10085 Grade 31CrMoV9 quenched and tempered (+QT) general
| Property |
Temperature |
Value |
| Density |
20.0 °C |
Density of 7.83 - 7.85 g/cm³ |
EN 10085 Grade 31CrMoV9 quenched and tempered (+QT) thermal
| Property |
Temperature |
Value |
| 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 |
| Specific heat capacity |
-100.0 °C |
Specific heat capacity of 423 J/(kg·K) |
| - |
20.0 °C |
Specific heat capacity of 460 - 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 25.7 - 36 W/(m·K) |
| - |
100.0 °C |
Thermal conductivity of 27.4 - 36.5 W/(m·K) |
| - |
200.0 °C |
Thermal conductivity of 28.5 - 37.3 W/(m·K) |
| - |
300.0 °C |
Thermal conductivity of 28.9 - 36.5 W/(m·K) |
| - |
400.0 °C |
Thermal conductivity of 28.5 - 34.8 W/(m·K) |
| - |
500.0 °C |
Thermal conductivity of 27.7 - 33.5 W/(m·K) |
| - |
600.0 °C |
Thermal conductivity of 26.8 W/(m·K) |
| Thermal diffusivity |
20.0 °C |
Thermal diffusivity of 7.1 mm²/s |
| - |
100.0 °C |
Thermal diffusivity of 7.1 mm²/s |
| - |
200.0 °C |
Thermal diffusivity of 6.9 mm²/s |
| - |
300.0 °C |
Thermal diffusivity of 6.6 mm²/s |
| - |
400.0 °C |
Thermal diffusivity of 6.1 mm²/s |
| - |
500.0 °C |
Thermal diffusivity of 5.3 mm²/s |
| - |
600.0 °C |
Thermal diffusivity of 4.5 mm²/s |
EN 10085 Grade 31CrMoV9 quenched and tempered (+QT) chemical
| Property |
Value |
| Carbon |
Carbon of 0.26 - 0.34 % |
| Chromium |
Chromium of 2.3 - 2.7 % |
| Manganese |
Manganese of 0.4 - 0.7 % |
| Molybdenum |
Molybdenum of 0.15 - 0.25 % |
| Phosphorus |
Phosphorus of 0.03 % |
| Silicon |
Silicon of 0.4 % |
| Sulfur |
Sulfur of 0.03 % |
| Vanadium |
Vanadium of 0.1 - 0.2 % |
EN 10085 Grade 31CrMoV9 quenched and tempered (+QT) electrical
| Property |
Temperature |
Value |
| Electrical resistivity |
20.0 °C |
Electrical resistivity of 1.8E-7 - 4.05E-7 Ω·m |
| - |
100.0 °C |
Electrical resistivity of 4.67E-7 Ω·m |
| - |
200.0 °C |
Electrical resistivity of 5.53E-7 Ω·m |
| - |
300.0 °C |
Electrical resistivity of 6.5E-7 Ω·m |
| - |
400.0 °C |
Electrical resistivity of 7.62E-7 Ω·m |
| - |
500.0 °C |
Electrical resistivity of 8.92E-7 Ω·m |
| - |
600.0 °C |
Electrical resistivity of 1.03E-6 Ω·m |
EN 10085 Grade 31CrMoV9 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 210 - 212 GPa |
- |
| - |
100.0 °C |
Elastic modulus of 205 - 207 GPa |
- |
| - |
200.0 °C |
Elastic modulus of 195 - 199 GPa |
- |
| - |
300.0 °C |
Elastic modulus of 185 - 192 GPa |
- |
| - |
400.0 °C |
Elastic modulus of 175 - 184 GPa |
- |
| - |
500.0 °C |
Elastic modulus of 165 - 175 GPa |
- |
| - |
600.0 °C |
Elastic modulus of 155 - 164 GPa |
- |
| Elongation |
20.0 °C |
Elongation of 11 - 12 % |
- |
| Poisson's ratio |
23.0 °C |
Poisson's ratio of 0.3 [-] |
Typical for Steel |
| Shear modulus |
20.0 °C |
Shear modulus of 81 GPa |
- |
| Tensile strength |
20.0 °C |
Tensile strength of 900 - 1200 MPa |
- |
| Yield strength |
20.0 °C |
Yield strength of 700 - 800 MPa |
- |
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