ASTM A487 Grade 12 Class A, Heat-Treated
Equivalent material: DIN 1.7225, DIN 42CrMo4, AFNOR 42CD4, BS 708M40, BS 709M40, BS EN19, UNI 42CrMo4, SS 2244, UNE 42CrMo4, UNE F.125, AISI 4140, AISI 4140H, AISI 4142H, AISI 4142, AISI 4145, AISI NV-7, SAE 4140, SAE 4140H, SAE 4142H, SAE 4142, SAE 4145, SAE NV-7, JIS SCM440, JIS SCM440M, JIS SCM440H, JIS SNB7, EN 42CrMo4, EN 1.7225, GOST 38ChM, GB/T 42CrMo, GB/T A30425, ASTM 4140H, ASTM 4142H, ASTM 4145, ASTM Grade B7, ASTM Grade B7M, ASTM Grade 12, ASTM Grade 7M, UNS G41400, UNS H41400, UNS H41420, UNS G41420, UNS G41450, IS 40Cr1Mo28, DIN 1.7227, DIN 42CrMoS4, EN 42CrMoS4, EN 1.7227
ASTM A487 Grade 12 Class A, Heat-Treated general
| Property |
Temperature |
Value |
Comment |
| Density |
20.0 °C |
Density of 7.8 - 7.9 g/cm³ |
Typical for Chromium Molybdenum Steel |
ASTM A487 Grade 12 Class A, Heat-Treated thermal
| Property |
Temperature |
Value |
Comment |
| Coefficient of thermal expansion |
20.0 °C |
Coefficient of thermal expansion of 1.1E-5 - 1.4E-5 1/K |
Typical for Chromium Molybdenum Steel |
| Melting point |
- |
Melting point of 1382 - 1529 °C |
Typical for Chromium Molybdenum Steel |
| Specific heat capacity |
20.0 °C |
Specific heat capacity of 448 - 502 J/(kg·K) |
Typical for Chromium Molybdenum Steel |
| Thermal conductivity |
20.0 °C |
Thermal conductivity of 36 - 43 W/(m·K) |
Typical for Chromium Molybdenum Steel |
ASTM A487 Grade 12 Class A, Heat-Treated chemical
| Property |
Value |
| Carbon |
Carbon of 0.05 - 0.2 % |
| Copper |
Copper of 0.5 % |
| Manganese |
Manganese of 0.4 - 0.7 % |
| Molybdenum |
Molybdenum of 0.9 - 1.2 % |
| Phosphorus |
Phosphorus of 0.04 % |
| Silicon |
Silicon of 0.6 % |
| Sulfur |
Sulfur of 0.035 % |
| Tungsten |
Tungsten of 0.1 % |
| Vanadium |
Vanadium of 0.03 % |
ASTM A487 Grade 12 Class A, Heat-Treated mechanical
| Property |
Temperature |
Value |
Comment |
| Elastic modulus |
20.0 °C |
Elastic modulus of 200 - 215 GPa |
Typical for Chromium Molybdenum Steel |
| Elongation A50 |
20.0 °C |
Elongation A50 of 20 % |
- |
| Poisson's ratio |
20.0 °C |
Poisson's ratio of 0.29 [-] |
Typical for Chromium Molybdenum Steel |
| Reduction of area |
20.0 °C |
Reduction of area of 35 % |
- |
| Tensile strength |
20.0 °C |
Tensile strength of 485 MPa |
- |
| Yield Strength Rp0.2, short transverse |
20.0 °C |
Yield Strength Rp0.2, short transverse of 275 MPa |
- |
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