Carbon Steel Q235 is one of the most widely used structural steel grades in Asia, particularly in China's manufacturing and construction sectors. The "Q" designation stands for "yield strength" (first letter of Chinese pinyin for "yield"), and "235" indicates the minimum yield strength of 235 MPa for steel thickness under 16mm. This mild carbon steel contains 0.14-0.22% carbon content, making it highly weldable and formable for diverse industrial applications.
- Carbon (C): ≤0.22%
- Silicon (Si): ≤0.35%
- Manganese (Mn): ≤1.40%
- Phosphorus (P): ≤0.045%
- Sulfur (S): ≤0.050%
- Remaining: Iron (Fe)
For Southeast Asian exporters selling on Alibaba.com, understanding Q235's international equivalents is crucial for communicating with global buyers. Q235 closely matches ASTM A36 (American standard), EN S235JR (European standard), and JIS SS400 (Japanese standard). This equivalence allows suppliers to serve multiple regional markets with similar material specifications, reducing inventory complexity and expanding customer reach.
Q235 Steel vs International Equivalent Grades: Mechanical Properties Comparison
| Property | Q235 (GB/T 700) | A36 (ASTM) | S235JR (EN 10025) | SS400 (JIS G3101) |
|---|---|---|---|---|
| Yield Strength (≤16mm) | ≥235 MPa | ≥250 MPa | ≥235 MPa | ≥245 MPa |
| Tensile Strength | 370-500 MPa | 400-550 MPa | 360-510 MPa | 400-510 MPa |
| Elongation (%) | ≥26% | ≥20% | ≥26% | ≥21% |
| Carbon Content | ≤0.22% | ≤0.26% | ≤0.22% | ≤0.23% |
| Primary Application | Construction, Machinery | Structural, Bridge | General Construction | General Structure |
The mechanical properties of Q235 make it particularly suitable for applications requiring moderate strength with excellent weldability and formability. Common uses include building structures, bridge components, machinery frames, automotive parts, and general fabrication work. For Alibaba.com sellers targeting Southeast Asian markets, Q235 offers a cost-effective alternative to higher-grade steels while meeting most structural requirements.
