GB Grade AH 690 GB 712
shipbuilding steel plate Product Introduction
GB Grade AH 690 GB 712 is an alloy steel first developed in the People's Republic of China. It was developed in the 1950s to provide a steel grade of superior strength and plasticity for the construction of large infrastructure projects. Initially, it was developed for bridge construction and other heavy steel structures, such as those found in railway lines. As the strength of the steel alloy improved over the years, it became the primary steel used for a variety of uses, including industrial machinery, shipbuilding, marine engineering, and automobile parts.
GB Grade AH 690 GB 712 is one of the main products of our company. Other than offer high quality Grade AH 690 with competitive price, we also help to resolve all kinds of doubts of clients. Such as Grade AH 690 chemical composition, Grade AH 690 properties,Grade AH 690 yield strength, Grade AH 690 tensile strength, Grade AH 690 equivalent grades, etc. Meanwhile, we also do procesing for GB Grade AH 690 GB 712, including cutting, bending, welding, drilling, etc.
Application: Structural steel for ships and marine engineering.
Heat treated: 1662°C - 1336°C.
shipbuilding steel plate Product Details
GB Grade AH 690 GB 712 Chemical element
For GB Grade AH 690 GB 712 datasheet and GB Grade AH 690 GB 712 chemical composition, please see the table below.
| Element | Min | Max | Similar |
|---|---|---|---|
| Si | - | 0.5500 | - |
| S | - | 0.0250 | - |
| P | - | 0.0250 | - |
| N | - | 0.0200 | - |
| Mn | - | 1.7000 | - |
| C | - | 0.2000 | - |
GB Grade AH 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 AH 690 GB 712 to produce permanent deformation without causing damage under external forces.
Stiffness: The ability of GB Grade AH 690 GB 712 to resist elastic deformation under stress.
Strength: The ability of GB Grade AH 690 GB 712 to resist deformation and fracture under external forces.
Hardness: The ability of GB Grade AH 690 GB 712 to resist the pressure of a harder object into it.
Impact toughness: The ability of GB Grade AH 690 GB 712 to resist fracture under impact loading.
Fatigue strength: The maximum stress that does not cause fracture when GB Grade AH 690 GB 712 is subjected to numerous repeated or alternating loads.
Fracture toughness: a performance index used to reflect GB Grade AH 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) |
|---|---|---|---|---|---|---|
| 666 (≥) | 721 (≥) | 41 | 11 | 24 | Solution and Aging, Annealing, Ausaging, Q+T,etc | 313 |
GB Grade AH 690 GB 712 Physical properties
Basic Physical Properties of GB Grade AH 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 |
|---|---|---|---|---|---|---|---|
| 32 | - | - | 0.14 | - | |||
| 461 | 589 | - | 14.3 | 233 | - | ||
| 559 | - | 41 | 23.2 | 432 | 443 |
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