Q235 steel is a widely used low-carbon structural steel originating in China and recognized internationally. It is valued for its balanced mechanical properties, weldability, ductility, and cost-effectiveness, making it suitable for construction, machinery, vehicle chassis, bridges, and industrial applications.
Yield Strength: 235 MPa (for thickness <=16 mm)
Tensile Strength: 370–500 MPa
Elongation: 21–26% (depending on thickness)
Density: 7.85 g/cm³
Melting Point: 1420–1460 ℃
Q235 Grades:
Q235A: General structural use, moderate strength, good plasticity
Q235B: Most common, better toughness and impact resistance (+20 ℃)
Q235C: Suitable for low-temperature environments (0 ℃)
Q235D: High-quality grade for very low temperatures (-20 ℃)
| C | P | S | |||
|---|---|---|---|---|---|
| Q235A | <=0.22 | <=0.35 | <=1.40 | <=0.045 | <=0.050 |
| Q235B | <=0.20 | <=0.35 | <=1.40 | <=0.045 | <=0.045 |
| Q235C | <=0.17 | <=0.35 | <=1.40 | <=0.040 | <=0.040 |
| Q235D | <=0.17 | <=0.35 | <=1.40 | <=0.035 | <=0.035 |
| <=16 | >=235 | 370–500 | >=26 |
| 16–40 | >=225 | 370–500 | >=26 |
| 40–60 | >=215 | 370–500 | >=25 |
| 60–100 | >=215 | 370–500 | >=24 |
| 100–150 | >=195 | 370–500 | >=22 |
| 150–200 | >=185 | 370–500 | >=21 |
Impact Resistance (Charpy V-notch)
| Q235A | - | |
| Q235B | +20 ℃ | >=27 |
| Q235C | 0 ℃ | >=27 |
| Q235D | -20 ℃ | >=27 |
| China GB/T 700 | |||||
|---|---|---|---|---|---|
| Q235A | - | SS400, SM400A | - | - | E250A |
| Q235B | A36 / A283 | SS400, SM400A | S235JR | 250 | E250B |
| Q235C | A36 / A573 | SM400A, SM400B | S235J0 | 250L0 | E250C |
| Q235D | A36 / A283M | SM400A | S235J0 / S235J2 | 250L20 | E250C |
Applications of Q235 Steel Pipes
Vehicles & Transport: Chassis parts, non-critical vehicle structures
Advantages of Q235 Steel Pipes
Cost-Effective: Economical and widely available
Global Compatibility: Interchangeable with international standards (A36, SS400, S235JR, E250)