GB 7Cr3Mo GB/T 15547 Introduction
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Application: Forged steel cold roll roll.
Heat treated: 1178°C - 1596°C.
GB 7Cr3Mo GB/T 15547 Chemical
GB 7Cr3Mo GB/T 15547 is an alloy of iron and carbon and other elements. Because of its high tensile strength and low cost, it is a major component used in buildings, infrastructure, tools, ships, automobiles, machines, appliances. The GB 7Cr3Mo GB/T 15547 chemical composition determined by ladle analysis shall comply with the specified values of the following table.
| Element | Min | Max | Similar |
|---|---|---|---|
| Si | 0.4000 | 0.7000 | - |
| S | - | 0.0150 | - |
| P | - | 0.0200 | - |
| Ni | - | 0.6000 | - |
| Mo | 0.2000 | 0.6000 | - |
| Mn | 0.4000 | 0.7000 | - |
| Cu | - | 0.2500 | - |
| Cr | 2.8000 | 3.5000 | - |
| C | 0.6500 | 0.7500 | - |
GB 7Cr3Mo GB/T 15547 Mechanical
The GB 7Cr3Mo GB/T 15547 material mechanical properties shall comply with the values given in the following table.
| Yield Rp0.2 (MPa) | Tensile Rm (MPa) | Impact KV/Ku (J) | Elongation A (%) | Reduction in cross section on fracture Z (%) | As-Heat-Treated Condition | Brinell hardness (HBW) |
|---|---|---|---|---|---|---|
| 643 (≥) | 225 (≥) | 41 | 33 | 21 | Solution and Aging, Annealing, Ausaging, Q+T,etc | 422 |
GB 7Cr3Mo GB/T 15547 Physical
Physical performance parameters of GB 7Cr3Mo GB/T 15547 are mainly indicated by density, poisson's ratio, thermal conductivity, specific thermal capacity, coefficient of thermal expansion, modulus of elasticity, electrical resistance value, etc.
| Temperature (°C) | Modulus of elasticity (GPa) | Mean coefficient of thermal expansion 10-6/(°C) between 20(°C) and | Thermal conductivity (W/m·°C) | Specific thermal capacity (J/kg·°C) | Specific electrical resistivity (Ω mm²/m) | Density (kg/dm³) | Poisson’s coefficient, ν |
|---|---|---|---|---|---|---|---|
| 42 | - | - | 0.13 | - | |||
| 744 | 534 | - | 24.3 | 224 | - | ||
| 694 | - | 33 | 22.2 | 111 | 244 |
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