GB Grade FH 690 GB 712
shipbuilding steel plate Product Introduction
GB Grade FH 690 GB 712 is an alloy steel composed of iron, carbon, and various other elements, such as manganese, silicon, and phosphorus. It has high tensile strength and good toughness, as well as excellent cold forming properties. The alloy steel also has good resistance to heat, wear, and fatigue. It can be easily machined, welded, and formed with very good surface finish results.
Our company has established long-term and stable cooperative relations with China Iron and Steel Association, Iron and Steel Association and iron and steel enterprises all over the year, ensuring the production of high-quality GB Grade FH 690 GB 712 steel and giving preferential prices. Our GB Grade FH 690 GB 712 steel products are exported to more than 70 countries and regions overseas and have received good reviews.
Application: Structural steel for ships and marine engineering.
Heat treated: 1938°C - 1594°C.
shipbuilding steel plate Product Details
GB Grade FH 690 GB 712 Chemical element
GB Grade FH 690 GB 712 in addition to carbon, steel also contains a small amount of manganese (Mn), silicon (Si), sulfur (S), phosphorus (P), oxygen (O), nitrogen (N) and hydrogen (H). These elements are not intentionally added to improve the quality of steel, but are brought in by ore and smelting process, so they are called impurity elements. These impurities have a certain impact on the properties of steel. In order to ensure the quality of steel, the chemical composition of all kinds of steel is strictly stipulated in technical standards.
The main elements proportion is as below:
| Element | Min | Max | Similar |
|---|---|---|---|
| W | - | - | 12.0000 |
| V | - | - | 3.8000 |
| Mo | - | - | 0.8000 |
| Cr | - | - | 4.1000 |
| Co | - | - | 4.8000 |
| C | - | - | 1.3500 |
GB Grade FH 690 GB 712 Mechanical properties
Introduction of mechanical properties GB Grade FH 690 GB 712:
Yield point(σs)When the stress of GB Grade FH 690 GB 712 or specimen exceeds the elastic limit in tension, even if the stress does not increase, the GB Grade FH 690 GB 712 or specimen will continue to undergo obvious plastic deformation. This phenomenon is called yielding, and the minimum stress value when yielding occurs is called yield point.
Tensile Strength(σb) : The maximum stress of GB Grade FH 690 GB 712 during tension from the beginning to the time of fracture. It indicates the ability of GB Grade FH 690 GB 712 to resist fracture.
Elongation(δs) : The percentage of the plastic elongation length to the original sample length is called elongation.
Yield-strength ratio(σs/σb) : The ratio of yield point (yield strength) to tensile strength of GB Grade FH 690 GB 712 is called its yield strength ratio. The greater the yield-strength ratio, the higher the reliability of structural parts.
Hardness: Hardness is the ability of GB Grade FH 690 GB 712 to resist hard objects pressing into its surface. The higher the hardness, the better the wear resistance.
| 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) |
|---|---|---|---|---|---|---|
| 585 (≥) | 284 (≥) | 13 | 34 | 24 | Solution and Aging, Annealing, Ausaging, Q+T,etc | 344 |
GB Grade FH 690 GB 712 Physical properties
Physical properties of GB Grade FH 690 GB 712 mainly cover modulus of elasticity, coefficient of thermal expansion, thermal conductivity, specific thermal capacity, electrical resistance value, 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 |
|---|---|---|---|---|---|---|---|
| 14 | - | - | 0.12 | - | |||
| 534 | 382 | - | 22.3 | 141 | - | ||
| 961 | - | 43 | 11.2 | 414 | 111 |
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