GB Grade DH 690 GB 712 structural steel
shipbuilding steel Product Introduction
GB Grade DH 690 GB 712 is used in a variety of applications, such as bridge construction, industrial machinery, shipbuilding, and vehicle parts. It is often used in deeper parts of bridges and other large structures, as it can handle higher levels of stress and strain. It is also used in vehicles for suspension parts and other components, such as drive shafts and axles. In shipbuilding, it is used for ship frames and other parts, due to its strength and resistance to corrosion. It can also be used in industrial machines, such as presses and conveyor rollers, due to its resistance to wear and tear.
shipbuilding steel Product Details
GB Grade DH 690 GB 712 Mechanical Properties
The main mechanical properties are elasticity, plasticity, stiffness, aging sensitivity, strength, hardness, impact toughness, fatigue strength and fracture toughness.
Elasticity: Metal material deforms when it is subjected to external force. When the external force is removed, it can restore its original shape.
Plasticity: The ability of GB Grade DH 690 GB 712 to produce permanent deformation without causing damage under external forces.
Stiffness: The ability of GB Grade DH 690 GB 712 to resist elastic deformation under stress.
Strength: The ability of GB Grade DH 690 GB 712 to resist deformation and fracture under external forces.
Hardness: The ability of GB Grade DH 690 GB 712 to resist the pressure of a harder object into it.
Impact toughness: The ability of GB Grade DH 690 GB 712 to resist fracture under impact loading.
Fatigue strength: The maximum stress that does not cause fracture when GB Grade DH 690 GB 712 is subjected to numerous repeated or alternating loads.
Fracture toughness: a performance index used to reflect GB Grade DH 690 GB 712 is ability to resist crack instability and expansion
| 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) |
|---|---|---|---|---|---|---|
| 596 (≥) | 285 (≥) | 21 | 11 | 13 | Solution and Aging, Annealing, Ausaging, Q+T,etc | 144 |
GB Grade DH 690 GB 712 Physical Properties
Basic Physical Properties of GB Grade DH 690 GB 712 Steel
| 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 |
|---|---|---|---|---|---|---|---|
| 23 | - | - | 0.24 | - | |||
| 653 | 614 | - | 11.3 | 121 | - | ||
| 768 | - | 34 | 32.2 | 122 | 411 |
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