DIN 17230 Grade 44Cr2 quenched and tempered (+QT)
DIN 17230 Grade 44Cr2 quenched and tempered (+QT) introduction
44 Cr 2 is an anti-friction bearing steel that can be refined and induction hardened. In the Jominy test it reaches surface hardnesses of approximately 62 HRC. It is used for discs and anti-friction bearing parts of larger dimensions.
Equivalent material: DIN 1.3561, EN 1.3561
DIN 17230 Grade 44Cr2 quenched and tempered (+QT) general
| Property | Temperature | Value |
|---|---|---|
| Density | 20.0 °C | Density of 7.8 - 7.85 g/cm³ |
DIN 17230 Grade 44Cr2 quenched and tempered (+QT) thermal
| Property | Temperature | Value |
|---|---|---|
| Coefficient of thermal expansion | -100.0 °C | Coefficient of thermal expansion of 1.08E-5 1/K |
| - | 20.0 °C | Coefficient of thermal expansion of 1.19E-5 1/K |
| - | 100.0 °C | Coefficient of thermal expansion of 1.25E-5 1/K |
| - | 200.0 °C | Coefficient of thermal expansion of 1.3E-5 1/K |
| - | 300.0 °C | Coefficient of thermal expansion of 1.36E-5 1/K |
| - | 400.0 °C | Coefficient of thermal expansion of 1.41E-5 1/K |
| - | 500.0 °C | Coefficient of thermal expansion of 1.45E-5 1/K |
| - | 600.0 °C | Coefficient of thermal expansion of 1.49E-5 1/K |
| 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 41.7 W/(m·K) |
| - | 100.0 °C | Thermal conductivity of 43.4 W/(m·K) |
| - | 200.0 °C | Thermal conductivity of 43.2 W/(m·K) |
| - | 300.0 °C | Thermal conductivity of 41.4 W/(m·K) |
| - | 400.0 °C | Thermal conductivity of 39.1 W/(m·K) |
| - | 500.0 °C | Thermal conductivity of 36.7 W/(m·K) |
| - | 600.0 °C | Thermal conductivity of 34.1 W/(m·K) |
| Thermal diffusivity | 20.0 °C | Thermal diffusivity of 11.6 mm²/s |
| - | 100.0 °C | Thermal diffusivity of 11.3 mm²/s |
| - | 200.0 °C | Thermal diffusivity of 10.5 mm²/s |
| - | 300.0 °C | Thermal diffusivity of 9.5 mm²/s |
| - | 400.0 °C | Thermal diffusivity of 8.3 mm²/s |
| - | 500.0 °C | Thermal diffusivity of 7.1 mm²/s |
| - | 600.0 °C | Thermal diffusivity of 5.8 mm²/s |
DIN 17230 Grade 44Cr2 quenched and tempered (+QT) chemical
| Property | Value |
|---|---|
| Carbon | Carbon of 0.42 - 0.48 % |
| Chromium | Chromium of 0.4 - 0.6 % |
| Copper | Copper of 0.3 % |
| Manganese | Manganese of 0.5 - 0.8 % |
| Phosphorus | Phosphorus of 0.03 % |
| Silicon | Silicon of 0.4 % |
| Sulfur | Sulfur of 0.035 % |
DIN 17230 Grade 44Cr2 quenched and tempered (+QT) electrical
| Property | Temperature | Value |
|---|---|---|
| Electrical resistivity | 20.0 °C | Electrical resistivity of 2.5E-7 Ω·m |
| - | 100.0 °C | Electrical resistivity of 2.95E-7 Ω·m |
| - | 200.0 °C | Electrical resistivity of 3.65E-7 Ω·m |
| - | 300.0 °C | Electrical resistivity of 4.53E-7 Ω·m |
| - | 400.0 °C | Electrical resistivity of 5.56E-7 Ω·m |
| - | 500.0 °C | Electrical resistivity of 6.74E-7 Ω·m |
| - | 600.0 °C | Electrical resistivity of 8.13E-7 Ω·m |
DIN 17230 Grade 44Cr2 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 207 GPa | - |
| - | 200.0 °C | Elastic modulus of 199 GPa | - |
| - | 300.0 °C | Elastic modulus of 192 GPa | - |
| - | 400.0 °C | Elastic modulus of 184 GPa | - |
| - | 500.0 °C | Elastic modulus of 175 GPa | - |
| - | 600.0 °C | Elastic modulus of 164 GPa | - |
| Elongation | 20.0 °C | Elongation of 12 - 15 % | - |
| Poisson's ratio | 23.0 °C | Poisson's ratio of 0.3 [-] | Typical for Steel |
| Reduction of area | 20.0 °C | Reduction of area of 35 - 45 % | - |
| Tensile strength | 20.0 °C | Tensile strength of 650 - 1100 MPa | - |
| Yield strength | 20.0 °C | Yield strength of 400 - 650 MPa | - |
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