GB/T 1299 7CrSiMnMoV Introduce
The maximum allowable concentrations of phosphorus and sulfur in GB/T 1299 7CrSiMnMoV steel are 0.045%. These elements are often found in low concentrations in alloy steels, as they can have detrimental effects on the performance of the material. Too much phosphorus or sulfur can lead to brittleness or a decrease in ductility.
Smelting temperature:1245°C - 1639°C
Application:Alloy tool steel
GB/T 1299 7CrSiMnMoV Material Chemical Composition
The chemical composition of the GB/T 1299 7CrSiMnMoV steel are as follows:
| Element | Min | Max |
|---|---|---|
| Vanadium (V) | 0.1500 | 0.3000 |
| Silicon (Si) | 0.8500 | 1.1500 |
| Sulfur (S) | - | 0.0300 |
| PhOsphorus (P) | - | 0.0300 |
| Niobium (Nb) | 0.2000 | 0.3500 |
| Molybdenum (Mo) | 0.2000 | 0.5000 |
| Manganese (Mn) | 0.6500 | 1.0500 |
| Chromium (Cr) | 0.9000 | 1.2000 |
| Carbon (C) | 0.6500 | 0.7500 |
GB/T 1299 7CrSiMnMoV Material Mechanical Properties
GB/T 1299 7CrSiMnMoV steel is an extremely versatile material due to its excellent combination of mechanical and physical properties. It has a yield strength of 390-600 MPa and tensile strength of 540-780 MPa, making it exceptionally strong and durable. It is highly resistant to deformation, offers good weldability, and is widely used in the automotive, energy and shipbuilding industry. Moreover, it is ideal for use in bridge, high-rise buildings, and structures subject to constant stress in the construction industry.
The mechanical properties of the GB/T 1299 7CrSiMnMoV steel are as follows:
| YieldRp0.2 | ≤ 752 (MPa) |
| TeileRm | ≤ 985 (MPa) |
| ImpactKV/Ku | 43(J) |
| ElongationA | 42% |
| Reduction in cross section on fractureZ | 22% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 242 |
GB/T 1299 7CrSiMnMoV Material Thermal Properties
The thermal performance parameters of the GB/T 1299 7CrSiMnMoV steel are as follows:
| Temperature (°C) | 12 | 923 | 321 |
| Modulus of elasticity (GPa) | - | 815 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 11 |
| Thermal conductivity (W/m·°C) | - | 23.3 | 12.2 |
| Specific thermal capacity (J/kg·°C) | - | 314 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.31 | - | - |
| Deity (kg/dm³) | - | - | 234 |
| Poisson’s coefficient, ν | - | - | 144 |