DIN 17210 Grade 20MoCr4 Soft Annealed Steel – Superior Wear Resistance for Automotive & Mechanical Applications
The steel 20 MoCr 4 respectively 20 MoCr 5 (mat. no. 1.7321) is used for wear loaded parts in the vehicle and mechanical engineering with medium core strength, high toughness and high fatigue strength (e.g. gears, shafts, axles). The lowest application amounts to -60 °C, the best application up to 60 mm nominal size.
Properties
General
| Property | Temperature | Value |
|---|---|---|
Density | 20.0 °C | 7.83 - 7.85 g/cm³ |
Mechanical
| Property | Temperature | Value | Comment |
|---|---|---|---|
Elastic modulus | -100.0 °C | 217 GPa | |
20.0 °C | 205 - 212 GPa | ||
100.0 °C | 200 - 207 GPa | ||
200.0 °C | 188 - 199 GPa | ||
300.0 °C | 192 GPa | ||
400.0 °C | 184 GPa | ||
500.0 °C | 175 GPa | ||
600.0 °C | 164 GPa | ||
Poisson's ratio | 23.0 °C | 0.29 [-] | Typical for Chromium Molybdenum Steel |
Shear modulus | 20.0 °C | 79 GPa | |
Thermal
| Property | Temperature | Value | Comment |
|---|---|---|---|
Coefficient of thermal expansion | -100.0 °C | 1.05E-5 1/K | |
20.0 °C | 1.15E-5 1/K | ||
100.0 °C | 1.1E-5 - 1.21E-5 1/K | ||
200.0 °C | 1.18E-5 - 1.27E-5 1/K | ||
300.0 °C | 1.32E-5 1/K | ||
400.0 °C | 1.36E-5 1/K | ||
500.0 °C | 1.4E-5 1/K | ||
600.0 °C | 1.44E-5 1/K | ||
Max service temperature, long | -60 - 0 °C | ||
Melting point | 1382 - 1529 °C | Typical for Chromium Molybdenum Steel | |
Specific heat capacity | -100.0 °C | 423 J/(kg·K) | |
20.0 °C | 460 - 461 J/(kg·K) | ||
100.0 °C | 479 J/(kg·K) | ||
200.0 °C | 499 J/(kg·K) | ||
300.0 °C | 517 J/(kg·K) | ||
400.0 °C | 536 J/(kg·K) | ||
500.0 °C | 558 J/(kg·K) | ||
600.0 °C | 587 J/(kg·K) | ||
Thermal conductivity | 20.0 °C | 41 - 42 W/(m·K) | |
100.0 °C | 39.8 - 42.7 W/(m·K) | ||
200.0 °C | 37.7 - 42.8 W/(m·K) | ||
300.0 °C | 41.6 W/(m·K) | ||
400.0 °C | 39.9 W/(m·K) | ||
500.0 °C | 37.8 W/(m·K) | ||
600.0 °C | 35.6 W/(m·K) | ||
Thermal diffusivity | 20.0 °C | 11.4 mm²/s | |
100.0 °C | 11 mm²/s | ||
200.0 °C | 10.3 mm²/s | ||
300.0 °C | 9.5 mm²/s | ||
400.0 °C | 8.5 mm²/s | ||
500.0 °C | 7.3 mm²/s | ||
600.0 °C | 6 mm²/s | ||
Electrical
| Property | Temperature | Value |
|---|---|---|
Electrical resistivity | 20.0 °C | 1.6E-7 - 2.54E-7 Ω·m |
100.0 °C | 3E-7 Ω·m | |
200.0 °C | 3.69E-7 Ω·m | |
300.0 °C | 4.51E-7 Ω·m | |
400.0 °C | 5.45E-7 Ω·m | |
500.0 °C | 6.54E-7 Ω·m | |
600.0 °C | 7.78E-7 Ω·m | |
Chemical properties
| Property | Value |
|---|---|
Carbon | 0.17 - 0.22 % |
Chromium | 0.3 - 0.6 % |
Manganese | 0.7 - 1 % |
Molybdenum | 0.4 - 0.5 % |
Phosphorus | 0.04 % |
Silicon | 0.4 % |
Sulfur | 0.035 % |
Metal
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