Applications of S235J0W Weathering Steel Plates
- Sep 12, 2026
Knowledge
Chemical Composition of S235J0W Weathering Steel Plate
| Element | Content (wt %) | Main Functions |
|---|---|---|
| C | ≤ 0.13 | Low carbon content, providing good strength, toughness, and weldability. |
| Si | ≤ 0.40 | Deoxidizes and increases strength and corrosion resistance. |
| Mn | 0.20 - 0.60 | Increases strength and toughness and improves the steel's metallurgical properties. |
| P | ≤ 0.035 | Small amounts promote weather resistance, but excessive levels reduce ductility and weldability. |
| S | ≤ 0.035 | Improves machinability, but excessive levels can cause hot brittleness and are therefore strictly controlled. |
| Cu | 0.25 - 0.55 | One of the core weather-resistant elements; promotes the formation of a protective rust layer and enhances resistance to atmospheric corrosion. |
| Cr | 0.40 - 0.80 | One of the core weather-resistant elements; it enhances corrosion resistance and promotes the formation of a dense, stable rust layer. |
| Ni | ≤ 0.65 | Enhances corrosion resistance and low-temperature toughness, and improves the weather resistance of copper-containing steels. |
| N | ≤ 0.009 | Strictly controlled to avoid adverse effects on toughness and weldability. |
| Al | ≥ 0.020 | Deoxidizes, refines grain size, and improves the microstructural stability of the steel. |
1) S235J0W relies on a Cu+P+Cr+Ni alloy system to form a dense, stable protective rust layer in outdoor atmospheric environments;
2) Low carbon, low sulfur, and low phosphorus content ensure weldability and impact toughness at 0°C, making it suitable for bridges, building facades, and outdoor structural components.
Note: The above data are typical reference values; the specific chemical composition of the material is subject to the corresponding product warranty certificate.
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