GB/T 1591 Q420A Introduce
The major advantages of GB/T 1591 are that it optimizes the classification of steel products, it simplifies the production and inspection process, and it ensures product quality. It also promotes the efficient use of resources and helps the industry reduce cost and waste. It enhances the consistency of the steel products and its fabrication processes, helping to improve overall competitiveness.
Smelting temperature:1668°C - 1161°C
Application:Low alloy high strength structural steel
GB/T 1591 Q420A Material Mechanical Properties
GB/T 1591 Q420A steels are high-strength structural steel grades developed by China. The mechanical properties of these steels are heavily influenced by the grade and chemical composition of the material. Carbon, copper, manganese and phosphorus are important elements when considering the strength and hardness of the steel, while chromium, nickel and molybdenum are important when considering corrosion resistance. The weldability of the steel is also affected by the level of carbon, phosphorus and sulfur in the material. The elasticity, strength, toughness, fatigue strength and wear resistance of GB/T 1591 Q420A steels are all important properties when selecting the most suitable material for an application.
The mechanical properties of the GB/T 1591 Q420A steel are as follows:
| YieldRp0.2 | ≤ 816 (MPa) |
| TeileRm | ≤ 439 (MPa) |
| ImpactKV/Ku | 11(J) |
| ElongationA | 31% |
| Reduction in cross section on fractureZ | 33% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 142 |
GB/T 1591 Q420A Material Thermal Properties
The thermal performance parameters of the GB/T 1591 Q420A steel are as follows:
| Temperature (°C) | 43 | 811 | 693 |
| Modulus of elasticity (GPa) | - | 685 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 12 |
| Thermal conductivity (W/m·°C) | - | 32.3 | 13.2 |
| Specific thermal capacity (J/kg·°C) | - | 434 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.42 | - | - |
| Deity (kg/dm³) | - | - | 442 |
| Poisson’s coefficient, ν | - | - | 241 |
GB/T 1591 Q420A Material Machining Technology
In addition to its excellent performance, GB/T 1591 Q420A also provides good weldability. Under the same conditions, compared with other steels, GB/T 1591 Q420As are required to use smaller welding rods. Therefore, the cost is lower. GB/T 1591 Q420A is a kind of high-performance alloy steel. Its excellent performance makes it widely used in various industries and can reduce the cost of use. Therefore, it is an ideal choice for large-scale projects.