GB/T 16270 Q690E Introduce
Steel is the world's most important material. It is found in virtually every modern structure, from the bridges we drive over to the skyscrapers that dominate man-made skylines. Steel is an alloy of iron and a range of other elements, and its properties depend on the amounts and types of elements that make up the alloy. GB/T 16270 Q690E steel is a high performance structural steel made from a variety of components, including iron, carbon, chromium, manganese, and vanadium.
Smelting temperature:1621°C - 1571°C
Application:Quenched and tempered steel plate for high strength structure
GB/T 16270 Q690E Material Chemical Composition
The chemical composition of the GB/T 16270 Q690E 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) | - | 0.0200 |
| PhOsphorus (P) | - | 0.0250 |
| Manganese (Mn) | - | 2.0000 |
| Silicon (Si) | - | 0.6000 |
| Carbon (C) | - | 0.1800 |
GB/T 16270 Q690E Material Mechanical Properties
The mechanical properties of the GB/T 16270 Q690E steel are as follows:
| YieldRp0.2 | ≤ 968 (MPa) |
| TeileRm | ≤ 477 (MPa) |
| ImpactKV/Ku | 33(J) |
| ElongationA | 42% |
| Reduction in cross section on fractureZ | 41% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 141 |
GB/T 16270 Q690E Material Thermal Properties
The thermal performance parameters of the GB/T 16270 Q690E steel are as follows:
| Temperature (°C) | 11 | 287 | 571 |
| Modulus of elasticity (GPa) | - | 472 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 33 |
| Thermal conductivity (W/m·°C) | - | 43.3 | 33.2 |
| Specific thermal capacity (J/kg·°C) | - | 143 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.14 | - | - |
| Deity (kg/dm³) | - | - | 123 |
| Poisson’s coefficient, ν | - | - | 344 |
GB/T 16270 Q690E Material Machining Technology
The recommended machining processes for GB/T 16270 Q690E steel include turning, drilling, sawing, milling, and grinding. For turning, carbide and ceramic tools should be used to reduce tool wear and improve surface finish. For drilling, high-speed steel, cobalt, and tungsten carbide twist drills should be used. For sawing, carbide-tipped saws are the best choice. For milling, tungsten carbide end mills should be used. For grinding, diamond-tipped wheels should be used to achieve a high level of surface finish.