GB/T 16270 Q690C Introduce
High strength quenched and tempered steel plates, in compliance with GB/T 16270, represent the advanced level in producing steel plates in China. High-strength quenched and tempered steel plate refers to advanced steel plate production process and high-strength performance. The main application of GB/T 16270-2009 steel plates are in nuclear power, offshore engineering and other high-risk areas.
Smelting temperature:1522°C - 1212°C
Application:Quenched and tempered steel plate for high strength structure
GB/T 16270 Q690C Material Chemical Composition
The chemical composition of the GB/T 16270 Q690C 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) | - | 1.8000 |
| Copper (Cu) | - | 0.5000 |
| Chromium (Cr) | - | 1.5000 |
| (CEV) | - | 0.6500 |
| Carbon (C) | - | 0.2000 |
| Boron (B) | - | 0.0050 |
GB/T 16270 Q690C Material Mechanical Properties
The mechanical properties of the GB/T 16270 Q690C steel are as follows:
| YieldRp0.2 | ≤ 348 (MPa) |
| TeileRm | ≤ 589 (MPa) |
| ImpactKV/Ku | 44(J) |
| ElongationA | 14% |
| Reduction in cross section on fractureZ | 32% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 432 |
GB/T 16270 Q690C Material Thermal Properties
The thermal performance parameters of the GB/T 16270 Q690C steel are as follows:
| Temperature (°C) | 34 | 685 | 285 |
| Modulus of elasticity (GPa) | - | 683 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 24 |
| Thermal conductivity (W/m·°C) | - | 32.3 | 22.2 |
| Specific thermal capacity (J/kg·°C) | - | 141 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.22 | - | - |
| Deity (kg/dm³) | - | - | 434 |
| Poisson’s coefficient, ν | - | - | 323 |
GB/T 16270 Q690C Material Machining Technology
The compatibility of tools with GB/T 16270 Q690C 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.