GB/T 1591 Q620C Introduce
GB/T 1591 has brought about unified production standards and made it easier for consumers to compare different steel products. This improves communication between manufacturers and consumers and helps to build a fair market. It is expected that the implementation of GB/T 1591 will bring further economic and environmental benefits to China's steel industry.
Smelting temperature:1536°C - 1915°C
Application:Low alloy high strength structural steel
GB/T 1591 Q620C Material Chemical Composition
The chemical composition of the GB/T 1591 Q620C steel are as follows:
| Element | Min | Max |
|---|---|---|
| Aluminum (Al) | 0.0150 | - |
| Boron (B) | - | 0.0040 |
| Molybdenum (Mo) | - | 0.3000 |
| Nitrogen (N) | - | 0.0150 |
| Copper (Cu) | - | 0.8000 |
| Nickel (Ni) | - | 0.8000 |
| Chromium (Cr) | - | 1.0000 |
| Titanium (Ti) | - | 0.2000 |
| Vanadium (V) | - | 0.1200 |
| Niobium (Nb) | - | 0.1100 |
| Sulfur (S) | - | 0.0300 |
| PhOsphorus (P) | - | 0.0300 |
| Manganese (Mn) | - | 2.0000 |
| Silicon (Si) | - | 0.6000 |
| Carbon (C) | - | 0.1800 |
| Titanium (Ti) | - | 0.0500 |
| Silicon (Si) | - | 0.8000 |
| Sulfur (S) | - | 0.0150 |
| PhOsphorus (P) | - | 0.0250 |
| Nickel (Ni) | - | 2.0000 |
| Niobium (Nb) | - | 0.0600 |
| Molybdenum (Mo) | - | 0.7000 |
| Manganese (Mn) | - | 1.7000 |
| Copper (Cu) | - | 0.5000 |
| Chromium (Cr) | - | 1.5000 |
| (CEV) | - | 0.6500 |
| Carbon (C) | - | 0.2000 |
| Boron (B) | - | 0.0050 |
GB/T 1591 Q620C Material Mechanical Properties
Fatigue strength is the measure of a material's ability to resist cyclic loading. GB/T 1591 Q620C steels are typically evaluated for their fatigue strength by performing tests on Weibull specimens. These tests measure the maximum stress that can be applied without failure.
The mechanical properties of the GB/T 1591 Q620C steel are as follows:
| YieldRp0.2 | ≤ 477 (MPa) |
| TeileRm | ≤ 264 (MPa) |
| ImpactKV/Ku | 12(J) |
| ElongationA | 32% |
| Reduction in cross section on fractureZ | 13% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 324 |
GB/T 1591 Q620C Material Thermal Properties
The thermal performance parameters of the GB/T 1591 Q620C steel are as follows:
| Temperature (°C) | 41 | 828 | 824 |
| Modulus of elasticity (GPa) | - | 622 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 34 |
| Thermal conductivity (W/m·°C) | - | 31.3 | 13.2 |
| Specific thermal capacity (J/kg·°C) | - | 133 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.24 | - | - |
| Deity (kg/dm³) | - | - | 412 |
| Poisson’s coefficient, ν | - | - | 441 |
GB/T 1591 Q620C Material Machining Technology
GB/T 1591 Q620C has been widely used in the construction industry and has been used in various large-scale projects. The high tensile strength and yield strength of GB/T 1591 Q620Cs are higher than that of conventional carbon steels. The low alloy and high strength of GB/T 1591 Q620Cs can reduce the weight and extend the life of structures and reduce the cost of use. At the same time, the excellent properties of GB/T 1591 Q620C can make cars and containers lighter, which is beneficial for fuel saving and environmental protection.