GB/T 1299 7CrMn2Mo Introduce
GB/T 1299 7CrMn2Mo steel is an alloy of iron and carbon, with production and use stretching back thousands of years. Steel can also contain other elements such as silicon and manganese, as well as trace elements such as cobalt and chromium. When it comes to commercial steel, however, one of the most commonly used and specified grades is GB/T 1299 7CrMn2Mo steel.
Smelting temperature:1183°C - 1287°C
Application:Alloy tool steel
GB/T 1299 7CrMn2Mo Material Chemical Composition
The chemical composition of the GB/T 1299 7CrMn2Mo steel are as follows:
| Element | Min | Max |
|---|---|---|
| Nickel (Ni) | - | 0.2500 |
| Copper (Cu) | - | 0.2500 |
| Sulfur (S) | - | 0.0200 |
| PhOsphorus (P) | - | 0.0300 |
| Molybdenum (Mo) | 0.9000 | 1.4000 |
| Chromium (Cr) | 0.9000 | 1.2000 |
| Manganese (Mn) | 1.8000 | 2.5000 |
| Silicon (Si) | 0.1000 | 0.5000 |
| Carbon (C) | 0.6500 | 0.7500 |
GB/T 1299 7CrMn2Mo Material Mechanical Properties
GB/T 1299 7CrMn2Mo steel has many desirable mechanical properties which make it an ideal material for construction. It has a yield strength of 390-600 MPa and tensile strength of 540-780 MPa, which makes it an exceptionally strong and durable material. Moreover, it has an elongation of 22-42%, a reduction in area of 40-50%, and an impact energy of 27-36 J at room temperature, making it highly resistant to deformation. Furthermore, it has good weldability, making it perfect for complex constructions.
The mechanical properties of the GB/T 1299 7CrMn2Mo steel are as follows:
| YieldRp0.2 | ≤ 151 (MPa) |
| TeileRm | ≤ 566 (MPa) |
| ImpactKV/Ku | 23(J) |
| ElongationA | 11% |
| Reduction in cross section on fractureZ | 43% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 414 |
GB/T 1299 7CrMn2Mo Material Thermal Properties
The thermal performance parameters of the GB/T 1299 7CrMn2Mo steel are as follows:
| Temperature (°C) | 43 | 657 | 374 |
| Modulus of elasticity (GPa) | - | 229 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 13 |
| Thermal conductivity (W/m·°C) | - | 24.3 | 22.2 |
| Specific thermal capacity (J/kg·°C) | - | 441 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.23 | - | - |
| Deity (kg/dm³) | - | - | 434 |
| Poisson’s coefficient, ν | - | - | 143 |