GB 713 Q345R Introduce
GB 713 Q345R is a special steel grade designed and manufactured by the China Iron and Steel Research Institute Group (CISRI). It is a medium carbon structural steel usually applied in boiler and pressure vessels. GB 713 Q345R is a kind of low alloy steel, which is characterized by high strength, good ductility and resistance to corrosion. It also has a low thermal expansion coefficient, good toughness and high hardness. This steel is also well known for its excellent welding performance and its convenience for machining.
Smelting temperature:1513°C - 1635°C
Application:Steel plate for boiler
GB 713 Q345R Material Chemical Composition
The chemical composition of the GB 713 Q345R steel are as follows:
| Element | Min | Max |
|---|---|---|
| Vanadium (V) | 0.1500 | 0.3000 |
| Copper (Cu) | - | 0.2500 |
| Silicon (Si) | - | 0.5500 |
| Sulfur (S) | - | 0.0150 |
| PhOsphorus (P) | - | 0.0250 |
| Manganese (Mn) | 1.2000 | 1.6000 |
| Carbon (C) | - | 0.2000 |
| Aluminum (Al) | 0.0200 | - |
| Nickel (Ni) | - | 0.3000 |
| (Cr+Ni+Cu+Mo) | - | 0.7000 |
| Chromium (Cr) | - | 0.3000 |
| Molybdenum (Mo) | - | 0.0800 |
| Copper (Cu) | - | 0.3000 |
| Vanadium (V) | - | 0.0500 |
| Titanium (Ti) | - | 0.0300 |
| Niobium (Nb) | - | 0.0500 |
| Sulfur (S) | - | 0.0100 |
| Manganese (Mn) | 1.2000 | 1.7000 |
| Carbon (C) | - | 0.2000 |
| Aluminum (Al) | 0.0200 | - |
GB 713 Q345R Material Mechanical Properties
The mechanical properties of the GB 713 Q345R steel are as follows:
| YieldRp0.2 | ≤ 886 (MPa) |
| TeileRm | ≤ 259 (MPa) |
| ImpactKV/Ku | 21(J) |
| ElongationA | 12% |
| Reduction in cross section on fractureZ | 43% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 131 |
GB 713 Q345R Material Thermal Properties
The thermal performance parameters of the GB 713 Q345R steel are as follows:
| Temperature (°C) | 41 | 223 | 853 |
| Modulus of elasticity (GPa) | - | 459 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 32 |
| Thermal conductivity (W/m·°C) | - | 22.3 | 41.2 |
| Specific thermal capacity (J/kg·°C) | - | 332 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.31 | - | - |
| Deity (kg/dm³) | - | - | 224 |
| Poisson’s coefficient, ν | - | - | 412 |