GB/T 16270 Q620F Introduce
GB/T 16270 Q620F Carbon and Low-alloy High-strength Structural Steel Plates strength comes from the alloying elements such as manganese, chromium, molybdenum, vanadium, nickel, and silicon. These elements form a unique combination of metals that strengthen the plate and make it resistant to stress, wear and fatigue. The addition of a small amount of chromium to the plate increases corrosion resistance, while the addition of silicon and nickel increases hardenability and ductility.
Smelting temperature:1648°C - 1969°C
Application:Quenched and tempered steel plate for high strength structure
GB/T 16270 Q620F Material Chemical Composition
The chemical composition of the GB/T 16270 Q620F steel are as follows:
| Element | Min | Max |
|---|---|---|
| Vanadium (V) | - | 0.1200 |
| Titanium (Ti) | - | 0.0500 |
| Silicon (Si) | - | 0.8000 |
| Sulfur (S) | - | 0.0100 |
| PhOsphorus (P) | - | 0.0200 |
| 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 16270 Q620F Material Mechanical Properties
The mechanical properties of the GB/T 16270 Q620F steel are as follows:
| YieldRp0.2 | ≤ 466 (MPa) |
| TeileRm | ≤ 971 (MPa) |
| ImpactKV/Ku | 14(J) |
| ElongationA | 42% |
| Reduction in cross section on fractureZ | 32% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 133 |
GB/T 16270 Q620F Material Thermal Properties
The thermal performance parameters of the GB/T 16270 Q620F steel are as follows:
| Temperature (°C) | 34 | 198 | 499 |
| Modulus of elasticity (GPa) | - | 991 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 42 |
| Thermal conductivity (W/m·°C) | - | 31.3 | 13.2 |
| Specific thermal capacity (J/kg·°C) | - | 242 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.42 | - | - |
| Deity (kg/dm³) | - | - | 322 |
| Poisson’s coefficient, ν | - | - | 343 |
GB/T 16270 Q620F Material Machining Technology
The compatibility of tools with GB/T 16270 Q620F steel is important in order to achieve optimal results during machining operations. The tools should have high wear resistance and be hard enough to cut through the steel without wearing out. High-speed steel, cobalt, and tungsten carbide tools are generally recommended as they are hard enough to cut through steel and also have high wear resistance. Carbide and ceramic tools are also recommended for turning operations as they can improve surface finish.