1. Product Parameters
Q235 steel pipe is a carbon structural steel pipe with the following key specifications:
Material Standard: GB/T 700-2006 (China) or equivalent international standards
Yield Strength: ≥235 MPa
Tensile Strength: 375–500 MPa
Elongation: ≥20%
Chemical Composition:Carbon (C): ≤0.22% (A/B grade), ≤0.18% (C/D grade)
Manganese (Mn): ≤1.4%
Sulfur (S) & Phosphorus (P): ≤0.050% (A/B), ≤0.045% (C/D)
Production Process: Hot-rolled or welded (seamless/spiral/straight-seam)
Surface Treatment: Black or galvanized (optional)
2. Applications
Q235 steel pipe is widely used in:
Construction: Structural frameworks for buildings, bridges, and warehouses
Fluid Transport: Water, gas, and low-pressure oil pipelines
Mechanical Parts: Bolts, brackets, and non-critical components
Infrastructure: Transmission towers, ship structures, and vehicle frames
3. Advantages
Cost-Effective: Lower alloy content reduces material costs
Weldability: Excellent for fabrication without preheating
Ductility: High elongation ensures adaptability to bending and forming
Versatility: Suitable for both static and dynamic load-bearing structures
4. Comparison with Q345
| Parameter | Q235 | Q345 (Low-Alloy) |
|---|---|---|
| Yield Strength | 235 MPa | 345 MPa56 |
| Carbon Content | ≤0.22% | ≤0.20%5 |
| Applications | General use | Heavy-duty structures7 |
For detailed technical data, refer to GB/T 700-2006 or ASTM equivalents
