DIN 17222 Grade 55Si7 cold rolled and hardened
DIN 17222 Grade 55Si7 cold rolled and hardened introduction
The steel 55 Si 7 is used as cold rolled steel strip for springs with high dimensional accuracy and surface condition up to 2.0 mm thicknesses.
Equivalent material: AFNOR 55Si7RR, DIN 1.5026, AFNOR 55S7, BS EN45, BS EN45 A, BS 250A53, BS 250A58, BS 250A61, AISI 9555, SAE 9555, EN 56Si7, EN 1.5026, GOST 55S2, GB 55Si2Mn
DIN 17222 Grade 55Si7 cold rolled and hardened general
| Property |
Temperature |
Value |
| Density |
20.0 °C |
Density of 7.8 g/cm³ |
DIN 17222 Grade 55Si7 cold rolled and hardened 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 17222 Grade 55Si7 cold rolled and hardened chemical
| Property |
Value |
| Carbon |
Carbon of 0.52 - 0.6 % |
| Manganese |
Manganese of 0.7 - 1 % |
| Phosphorus |
Phosphorus of 0.05 % |
| Silicon |
Silicon of 1.5 - 1.8 % |
| Sulfur |
Sulfur of 0.045 % |
DIN 17222 Grade 55Si7 cold rolled and hardened 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 17222 Grade 55Si7 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 650 [-] |
- |
| 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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