Q345GNH Steel Plate Mechanical Properties
Q345GNH Steel plate Product Introduction
GB Q345GNH GB/T 4171 Mechanical Properties
The tensile strength of GB Q345GNH GB/T 4171 steel is between 570 and 700MPa. The yield strength of this steel is min 195MPa and the elongation after fracture is approximately 12%. The test value of lateral expansion of steel goes up to 22%. The notch impact energy of GB/T 4171 steel plates can reach 34J. The cold bending performance of the steel plates is satisfactory, with the bend radius greater than 4 times the width of the steel plates.
The yield refers to the transition of GB Q345GNH GB/T 4171 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 Q345GNH GB/T 4171 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 Q345GNH GB/T 4171 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 Q345GNH GB/T 4171 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) |
|---|---|---|---|---|---|---|
| 462 (≥) | 223 (≥) | 32 | 43 | 23 | Solution and Aging, Annealing, Ausaging, Q+T,etc | 313 |
GB Q345GNH GB/T 4171 Physical Properties
The GB Q345GNH GB/T 4171 material physical properties shall comply with the values given in the following table.
| 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 | - | - | 0.22 | - | |||
| 375 | 361 | - | 14.3 | 244 | - | ||
| 919 | - | 41 | 31.2 | 422 | 132 |
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