EN 10250-2 Grade C55 normalized and tempered (+NT)
EN 10250-2 Grade C55 normalized and tempered (+NT) introduction
Steel C55 is usable for higher loaded parts in vehicle, engine and transmission engineering requiring improved abrasion resistance. Preferred application for parts undergoing a surface hardening. Lower cracking risk for larger and complexer parts than C60 (e.g. transmission wheels, shafts, anvil roller).
Equivalent material: GB 55, GB U20552, IS 5, IS 55C8, JIS S55C, GOST 55, ASTM A521 Grade 1055, SAE 1055, UNS G10550, DIN 1.0535, DIN C55, AFNOR C54, AFNOR C55, AFNOR AF70, BS 070M55, BS En9, BS En43A, BS C55, BS 080M50, UNI C55, SS 1655, AISI 1055, JIS S55CM, EN 1.0535, ISO C55, ISO CS55, GB/T 55, GB/T U20552, ASTM 1055, IS C55Mn75
EN 10250-2 Grade C55 normalized and tempered (+NT) general
| Property |
Temperature |
Value |
| Density |
20.0 °C |
Density of 7.8 g/cm³ |
EN 10250-2 Grade C55 normalized and tempered (+NT) thermal
| Property |
Temperature |
Value |
Comment |
| 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 |
- |
| Max service temperature |
- |
Max service temperature of 500 °C |
Typical for Carbon Steel |
| Melting point |
- |
Melting point of 1380 - 1514 °C |
Typical for Medium Carbon Steel |
| 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 |
- |
EN 10250-2 Grade C55 normalized and tempered (+NT) chemical
| Property |
Value |
| Carbon |
Carbon of 0.52 - 0.6 % |
| Chromium |
Chromium of 0.4 % |
| Manganese |
Manganese of 0.6 - 0.9 % |
| Molybdenum |
Molybdenum of 0.1 % |
| Nickel |
Nickel of 0.4 % |
| Phosphorus |
Phosphorus of 0.05 % |
| Silicon |
Silicon of 0.4 % |
| Sulfur |
Sulfur of 0.045 % |
EN 10250-2 Grade C55 normalized and tempered (+NT) 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 |
EN 10250-2 Grade C55 normalized and tempered (+NT) 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 11 - 12 % |
- |
| Elongation, transverse |
20.0 °C |
Elongation, transverse of 8 - 9 % |
- |
| Hardness, Brinell |
20.0 °C |
Hardness, Brinell of 229 [-] |
- |
| Poisson's ratio |
23.0 °C |
Poisson's ratio of 0.29 [-] |
Typical for Medium Carbon Steel |
| Shear modulus |
23.0 °C |
Shear modulus of 75 - 80 GPa |
Typical for Carbon Steel |
| Tensile strength |
20.0 °C |
Tensile strength of 590 - 640 MPa |
- |
| Tensile strength, transverse |
20.0 °C |
Tensile strength, transverse of 590 - 620 MPa |
- |
| Yield strength |
20.0 °C |
Yield strength of 250 - 330 MPa |
- |
| Yield strength, transverse |
20.0 °C |
Yield strength, transverse of 250 - 300 MPa |
- |
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