GB Grade FH 550 GB 712
shipbuilding steel plate Product Introduction
GB Grade FH 550 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.
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Application: Structural steel for ships and marine engineering.
Heat treated: 1777°C - 1246°C.
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GB Grade FH 550 GB 712 Chemical element
Carbon, Silicon, Manganese, Phosphorus, Sulfur are the main basic elements in GB Grade FH 550 GB 712.
Carbon is the most important hardening element in steel.
Silicon helps to strengthen the strength. Like manganese, silicon is used to maintain the strength of steel during steel production.
Manganese is the important austenite stabilizing elements contribute to the formation of texture structure and increase the firmness, strength and wear resistance.
Phosphorus is a harmful element. Reducing the plasticity and toughness of steel and appearing cold brittleness. It can significantly increase the strength of steel, and improve the atmospheric corrosion stability. The content should be limited to less than 0.05%.
Usually sulfur is a harmful element, which makes the hot brittleness of steel high, and the content of sulfur is limited to less than 0.05%.
| Element | Min | Max | Similar |
|---|---|---|---|
| Si | - | 0.5500 | - |
| S | - | 0.0300 | - |
| P | - | 0.0300 | - |
| N | - | 0.0200 | - |
| Mn | - | 1.7000 | - |
| C | - | 0.2100 | - |
GB Grade FH 550 GB 712 Mechanical properties
The yield refers to the transition of GB Grade FH 550 GB 712 from non-uniform elastic state to elastic-plastic state after reaching a certain deformation stress. It marks the beginning of macro-plastic deformation.
Tensile strength(Rm) refers to the maximum stress that GB Grade FH 550 GB 712 bears before breaking. When the steel yields to a certain extent, its resistance to deformation increases again due to the rearrangement of internal grains. At this time, although the deformation develops rapidly, it can only increase with the increase of stress until the maximum stress is reached. Thereafter, the GB Grade FH 550 GB 712 is ability to resist deformation is obviously reduced, and a large plastic deformation occurs at the weakest point, where the section of the specimen shrinks rapidly, leading to necking until fracture. The maximum stress value of GB Grade FH 550 GB 712 before tensile fracture is called strength limit or tensile strength.
| 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) |
|---|---|---|---|---|---|---|
| 344 (≥) | 488 (≥) | 42 | 12 | 42 | Solution and Aging, Annealing, Ausaging, Q+T,etc | 341 |
GB Grade FH 550 GB 712 Physical properties
Physical properties of GB Grade FH 550 GB 712 are mainly indicated by modulus of elasticity, thermal conductivity, specific thermal capacity, electrical resistance value, coefficient of thermal expansion, density, poisson's ratio, etc.
| 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 |
|---|---|---|---|---|---|---|---|
| 31 | - | - | 0.13 | - | |||
| 797 | 583 | - | 22.3 | 111 | - | ||
| 434 | - | 14 | 34.2 | 424 | 222 |
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