DIN 17222 Grade 71Si7 cold rolled and hardened
DIN 17222 Grade 71Si7 cold rolled and hardened introduction
The steel 71 Si 7 is used for highest loaded tension springs in the clock engineering and similar applications up to 3.0 mm sheet thicknesses.
Equivalent material: GOST 70S2ChA, DIN 1.5029, EN 71Si7, EN 1.5029
DIN 17222 Grade 71Si7 cold rolled and hardened general
| Property |
Temperature |
Value |
| Density |
20.0 °C |
Density of 7.78 g/cm³ |
DIN 17222 Grade 71Si7 cold rolled and hardened 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 1.21E-5 1/K |
| - |
200.0 °C |
Coefficient of thermal expansion of 1.27E-5 1/K |
| - |
300.0 °C |
Coefficient of thermal expansion of 1.32E-5 1/K |
| - |
400.0 °C |
Coefficient of thermal expansion of 1.36E-5 1/K |
| - |
500.0 °C |
Coefficient of thermal expansion of 1.4E-5 1/K |
| - |
600.0 °C |
Coefficient of thermal expansion of 1.44E-5 1/K |
| Specific heat capacity |
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 34.1 W/(m·K) |
| - |
100.0 °C |
Thermal conductivity of 35.2 W/(m·K) |
| - |
200.0 °C |
Thermal conductivity of 36.5 W/(m·K) |
| - |
300.0 °C |
Thermal conductivity of 36.7 W/(m·K) |
| - |
400.0 °C |
Thermal conductivity of 35.8 W/(m·K) |
| - |
500.0 °C |
Thermal conductivity of 34.5 W/(m·K) |
| - |
600.0 °C |
Thermal conductivity of 32.9 W/(m·K) |
| Thermal diffusivity |
20.0 °C |
Thermal diffusivity of 9.5 mm²/s |
| - |
100.0 °C |
Thermal diffusivity of 9.2 mm²/s |
| - |
200.0 °C |
Thermal diffusivity of 8.9 mm²/s |
| - |
300.0 °C |
Thermal diffusivity of 8.3 mm²/s |
| - |
400.0 °C |
Thermal diffusivity of 7.7 mm²/s |
| - |
500.0 °C |
Thermal diffusivity of 6.7 mm²/s |
| - |
600.0 °C |
Thermal diffusivity of 5.6 mm²/s |
DIN 17222 Grade 71Si7 cold rolled and hardened chemical
| Property |
Value |
| Carbon |
Carbon of 0.68 - 0.75 % |
| Manganese |
Manganese of 0.6 - 0.8 % |
| Phosphorus |
Phosphorus of 0.04 % |
| Silicon |
Silicon of 1.5 - 1.8 % |
| Sulfur |
Sulfur of 0.035 % |
DIN 17222 Grade 71Si7 cold rolled and hardened electrical
| Property |
Temperature |
Value |
| Electrical resistivity |
20.0 °C |
Electrical resistivity of 3.05E-7 Ω·m |
| - |
100.0 °C |
Electrical resistivity of 3.64E-7 Ω·m |
| - |
200.0 °C |
Electrical resistivity of 4.32E-7 Ω·m |
| - |
300.0 °C |
Electrical resistivity of 5.12E-7 Ω·m |
| - |
400.0 °C |
Electrical resistivity of 6.07E-7 Ω·m |
| - |
500.0 °C |
Electrical resistivity of 7.16E-7 Ω·m |
| - |
600.0 °C |
Electrical resistivity of 8.42E-7 Ω·m |
DIN 17222 Grade 71Si7 cold rolled and hardened mechanical
| Property |
Temperature |
Value |
Comment |
| Elastic modulus |
-100.0 °C |
Elastic modulus of 217 GPa |
- |
| - |
20.0 °C |
Elastic modulus of 206 - 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 |
- |
| Hardness, Vickers |
20.0 °C |
Hardness, Vickers of 680 [-] |
- |
| Poisson's ratio |
23.0 °C |
Poisson's ratio of 0.3 [-] |
Typical for Steel |
| Shear modulus |
20.0 °C |
Shear modulus of 78 GPa |
- |
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