Equivalent Grade: Japanese SS400
Quality Grades: Q235A, Q235B, Q235C, Q235D
Q235 steel is widely used in structural, mechanical, and civil applications. Its moderate strength, good plasticity, and toughness make it suitable for various structural components, pipes, and machinery parts.
Mechanical Properties of Q235 Steel
Test Sample: 16mm steel bar
Unit Conversion: 1 MPa = 1 N/mm²
| Property | Q235 Steel |
|---|---|
| Yield Strength | 235 MPa |
| Tensile Strength | 370–500 MPa |
| Elongation | 26% |
Yield Strength by Grade and Thickness (MPa, ≥)
| Steel Grade | Quality | d ≤ 16 mm | 16 < d ≤ 40 mm | 40 < d ≤ 100 mm | 100 < d ≤ 150 mm | 150 < d ≤ 200 mm | d ≤ 100 mm (Tensile Strength) |
|---|---|---|---|---|---|---|---|
| Q235 | Q235A | 235 | 225 | 215 | 195 | 185 | 370–500 |
| Q235 | Q235B | 235 | 225 | 215 | 195 | 185 | 370–500 |
| Q235 | Q235C | 235 | 225 | 215 | 195 | 185 | 370–500 |
| Q235 | Q235D | 235 | 225 | 215 | 195 | 185 | 370–500 |
Minimum Elongation (%) by Thickness
| Steel Grade | d ≤ 40 mm | 40 < d ≤ 60 mm | 60 < d ≤ 100 mm | 100 < d ≤ 150 mm | 150 < d ≤ 200 mm |
|---|---|---|---|---|---|
| Q235 | 26 | 25 | 24 | 22 | 21 |
Minimum Charpy Impact Energy (V-Notch)
| Steel Grade | Quality | Test Temp. (°C) | Impact Energy, Longitudinal (J, ≥) |
|---|---|---|---|
| Q235 | Q235A | – | – |
| Q235 | Q235B | +20 | 27 |
| Q235 | Q235C | 0 | – |
| Q235 | Q235D | -20 | – |
Notes:
Yield strength decreases as the thickness increases.
Elongation slightly decreases with increasing thickness.
Impact toughness varies with quality grade and test temperature; Q235D is designed for low-temperature applications.
