GB 712 Grade DH690 Introduce
GB 712 Grade DH690 is a high grade steel perfect for use in shipbuilding and various other construction projects. It features excellent weldability, good machinability and strength, as well as good corrosion resistance and impact strength.
Smelting temperature:1734°C - 1259°C
Application:Structural steel for hull
GB 712 Grade DH690 Material Mechanical Properties
The mechanical properties of the GB 712 Grade DH690 steel are as follows:
| YieldRp0.2 | ≤ 596 (MPa) |
| TeileRm | ≤ 285 (MPa) |
| ImpactKV/Ku | 21(J) |
| ElongationA | 11% |
| Reduction in cross section on fractureZ | 13% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 144 |
GB 712 Grade DH690 Material Thermal Properties
The thermal performance parameters of the GB 712 Grade DH690 steel are as follows:
| Temperature (°C) | 23 | 653 | 768 |
| Modulus of elasticity (GPa) | - | 614 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 34 |
| Thermal conductivity (W/m·°C) | - | 11.3 | 32.2 |
| Specific thermal capacity (J/kg·°C) | - | 121 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.24 | - | - |
| Deity (kg/dm³) | - | - | 122 |
| Poisson’s coefficient, ν | - | - | 411 |