GB/T 1299 Cr8 Introduce
The maximum allowable concentrations of phosphorus and sulfur in GB/T 1299 Cr8 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:1331°C - 1559°C
Application:Alloy tool steel
GB/T 1299 Cr8 Material Chemical Composition
The chemical composition of the GB/T 1299 Cr8 steel are as follows:
| Element | Min | Max |
|---|---|---|
| Nickel (Ni) | - | 0.2500 |
| Copper (Cu) | - | 0.2500 |
| Sulfur (S) | - | 0.0200 |
| PhOsphorus (P) | - | 0.0300 |
| Chromium (Cr) | 7.5000 | 8.5000 |
| Manganese (Mn) | 0.2000 | 0.6000 |
| Silicon (Si) | 0.2000 | 0.6000 |
| Carbon (C) | 1.6000 | 1.9000 |
GB/T 1299 Cr8 Material Mechanical Properties
Due to its excellent combination of mechanical and physical properties, GB/T 1299 Cr8 steel is ideal for use in many construction-related applications. It is frequently used in the manufacturing of bridges, high-rise buildings, and structures that are subject to constant stresses. It is also widely used in the automotive, energy, and shipbuilding industry due to its combination of strength and durability.
The mechanical properties of the GB/T 1299 Cr8 steel are as follows:
| YieldRp0.2 | ≤ 699 (MPa) |
| TeileRm | ≤ 983 (MPa) |
| ImpactKV/Ku | 24(J) |
| ElongationA | 33% |
| Reduction in cross section on fractureZ | 31% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 342 |
GB/T 1299 Cr8 Material Thermal Properties
The thermal performance parameters of the GB/T 1299 Cr8 steel are as follows:
| Temperature (°C) | 13 | 614 | 327 |
| Modulus of elasticity (GPa) | - | 877 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 31 |
| Thermal conductivity (W/m·°C) | - | 42.3 | 32.2 |
| Specific thermal capacity (J/kg·°C) | - | 324 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.34 | - | - |
| Deity (kg/dm³) | - | - | 233 |
| Poisson’s coefficient, ν | - | - | 231 |