Alloy Steel Rod Shafts With Heat Treatment and Quenched GB A34202 GB/T 3077 20CrMnMo Round Bar 150mm
Introduction
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.
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Application: Alloy structural steel.
Heat treated: 1324°C - 1567°C.
GB A34202 GB/T 3077 Chemical
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 | - |
GB A34202 GB/T 3077 Mechanical
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 |
GB A34202 GB/T 3077 Physical
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 |
GB A34202 GB/T 3077 Processing Service
