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The GB A34202 GB/T 3077 standard is an important national standard for steel grades in mainland China. By providing a comprehensive classification of carbon and alloy steels based on their tensile strength, yield strength, impact strength and heat resistance, the GB A34202 GB/T 3077 system simplifies the process of specifying steel. The introduction of this system has had a significant impact on the Chinese steel industry by providing uniformity, consistency and interchangeability of steel grades.
We have been engaged in steel sales and processing since establishment. we have been experienced in supplying, can give strong support for clients in all kinds of information about GB A34202 GB/T 3077, Provide high-quality GB A34202 GB/T 3077 products, high-quality services,. We have complete quality control system, logistics system and after sales system to guarantee the smooth running of the whole process. Choosing us is choosing to rest assured.
Application: Alloy structural steel.
Heat treated: 1324°C - 1567°C.
GB A34202 GB/T 3077 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 |
|---|---|---|---|
| Si | 0.1700 | 0.3700 | - |
| S | - | 0.0350 | - |
| P | - | 0.0350 | - |
| Ni | - | 0.3000 | - |
| Mo | 0.2000 | 0.3000 | - |
| Mn | 0.9000 | 1.2000 | - |
| Cu | - | 0.3000 | - |
| Cr | 1.1000 | 1.4000 | - |
| C | 0.1700 | 0.2300 | - |
Yield strength is the yield limit of GB A34202 GB/T 3077 when
yielding occurs, that is, the stress resisting micro-plastic
deformation. The external force greater than the yield strength
will make the GB A34202 GB/T 3077 parts permanent failure and
unable to recover. Less than this, the GB A34202 GB/T 3077 parts
will return to their original shape.
Tensile strength is the critical value of transition from uniform
plastic deformation to locally concentrated plastic deformation. It
is also the maximum load-carrying capacity of GB A34202 GB/T 3077
under static tension. Tensile strength is the resistance that
characterizes the maximum uniform plastic deformation of GB A34202
GB/T 3077. The deformation of tensile specimens is uniform before
they bear the maximum tensile stress, but beyond that, the GB
A34202 GB/T 3077 begins to neck, i.e. concentrate deformation.
| 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) |
|---|---|---|---|---|---|---|
| 277 (≥) | 155 (≥) | 11 | 23 | 31 | Solution and Aging, Annealing, Ausaging, Q+T,etc | 411 |
Physical properties of GB A34202 GB/T 3077 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 |
|---|---|---|---|---|---|---|---|
| 32 | - | - | 0.31 | - | |||
| 165 | 188 | - | 21.3 | 444 | - | ||
| 444 | - | 13 | 21.2 | 233 | 221 |
