GB/T 700 Q235D Introduce
GB/T 700 Q235D steel is a low carbon and high-strength quenched and tempered structural steel developed and produced in accordance with Chinese industry standards. GB/T 700 Q235D steel is an ideal choice for a variety of construction applications, due to its exceptional strength-to-weight ratio and excellent performance in fluctuating, and/or changing temperature environments. GB/T 700 Q235D steel is produced in hot rolled, normalized, and quenched and tempered forms.
Smelting temperature:1432°C - 1445°C
Application:Carbon structural steels
GB/T 700 Q235D Material Chemical Composition
The chemical composition of the GB/T 700 Q235D steel are as follows:
| Element | Min | Max |
|---|---|---|
| PhOsphorus (P) | - | 0.0350 |
| Sulfur (S) | - | 0.0350 |
| Manganese (Mn) | 0.3500 | 0.8000 |
| Silicon (Si) | - | 0.3000 |
| Carbon (C) | - | 0.1700 |
GB/T 700 Q235D Material Mechanical Properties
The yield strength of GB/T 700 Q235D steel is the amount of force that must be applied to it before it starts to yield or deform plastically. Yield strength is also referred to as the yield point or yield limit. It is measured using a yield strength test, which typically involves applying a longitudinal tensile force to a sample of material until it starts to yield or deform plastically. Generally, the yield strength of GB/T 700 Q235D steel can reach up to 300MPa.
The mechanical properties of the GB/T 700 Q235D steel are as follows:
| YieldRp0.2 | ≤ 733 (MPa) |
| TeileRm | ≤ 445 (MPa) |
| ImpactKV/Ku | 41(J) |
| ElongationA | 13% |
| Reduction in cross section on fractureZ | 33% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 134 |
GB/T 700 Q235D Material Thermal Properties
The thermal performance parameters of the GB/T 700 Q235D steel are as follows:
| Temperature (°C) | 21 | 576 | 373 |
| Modulus of elasticity (GPa) | - | 282 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 34 |
| Thermal conductivity (W/m·°C) | - | 24.3 | 41.2 |
| Specific thermal capacity (J/kg·°C) | - | 331 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.23 | - | - |
| Deity (kg/dm³) | - | - | 133 |
| Poisson’s coefficient, ν | - | - | 413 |
GB/T 700 Q235D Material Machining Technology
The key to achieving good results when machining GB/T 700 Q235D steel is to use a combination of the right cutting tools, the appropriate machining processes, and the necessary safety measures. To ensure good results, it is important to use sharp cutting tools that are the right size for the job, and to use the appropriate speeds and feeds when machining. In addition, the right coolant should be used to ensure that the cutting tools do not overheat. Finally, appropriate safety procedures must be followed at all times to ensure that no accidents occur.