GB/T 714 Q550qNHF Introduce
The GB/T 714 Q550qNHF steel system is a rapidly gaining popularity due to its many remarkable mechanical properties. It is a type of steel that has been used for years in the construction of roads, bridges, dams and other infrastructure elements. It is well known to be an exceptionally strong and corrosion resistant material, and its high strength-to-weight ratio makes it a cost-effective choice for projects that require substantial weight-bearing capabilities.
Smelting temperature:1693°C - 1869°C
Application:Structural steel for bridge
GB/T 714 Q550qNHF Material Chemical Composition
The chemical composition of the GB/T 714 Q550qNHF steel are as follows:
| Element | Min | Max |
|---|---|---|
| (Pcm) | - | 0.2500 |
| (CEV) | - | 0.5700 |
| (CEV) | - | 0.5200 |
| Hydrogen (H) | - | 0.0002 |
| Boron (B) | - | 0.0005 |
| Sulfur (S) | - | 0.0150 |
| PhOsphorus (P) | - | 0.0150 |
| (Nb+V+Ti) | - | 0.2200 |
| Aluminum (Al) | 0.0150 | 0.0500 |
| Nitrogen (N) | - | 0.0080 |
| Molybdenum (Mo) | - | 0.2500 |
| Copper (Cu) | 0.2500 | 0.5500 |
| Nickel (Ni) | 0.3000 | 0.4500 |
| Chromium (Cr) | 0.4500 | 0.7000 |
| Titanium (Ti) | 0.0060 | 0.0300 |
| Vanadium (V) | 0.0100 | 0.1000 |
| Niobium (Nb) | 0.0100 | 0.1000 |
| Manganese (Mn) | 1.1000 | 1.5000 |
| Silicon (Si) | 0.1500 | 0.5000 |
| Carbon (C) | - | 0.1100 |
GB/T 714 Q550qNHF Material Mechanical Properties
The mechanical properties of the GB/T 714 Q550qNHF steel are as follows:
| YieldRp0.2 | ≤ 828 (MPa) |
| TeileRm | ≤ 578 (MPa) |
| ImpactKV/Ku | 11(J) |
| ElongationA | 32% |
| Reduction in cross section on fractureZ | 14% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 232 |
GB/T 714 Q550qNHF Material Thermal Properties
The thermal performance parameters of the GB/T 714 Q550qNHF steel are as follows:
| Temperature (°C) | 33 | 529 | 836 |
| Modulus of elasticity (GPa) | - | 558 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 41 |
| Thermal conductivity (W/m·°C) | - | 34.3 | 33.2 |
| Specific thermal capacity (J/kg·°C) | - | 214 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.42 | - | - |
| Deity (kg/dm³) | - | - | 133 |
| Poisson’s coefficient, ν | - | - | 322 |