The difference between S235J0 and is that S235J0 is carbon structural steel, S235J0W is weathering structural steel. S235J0 steel conducts 0℃impact test, and it is used to manufacture welding, bolting and riveting structures.
S235J0W steel chemical composition, melting analysis:
| C | Si | Mn | P | S | Cr | Cu | N |
| ≤0.13 | ≤0.4 | 0.2-0.6 | ≤0.035 | ≤0.035 | 0.4-0.8 | 0.25-0.55 | ≤0.009 |
Phosphorus (P): In general, phosphorus is a harmful element in steel, which increases the cold brittleness of steel, deteriorates the welding performance, reduces the plasticity, and deteriorates the cold bending performance. Therefore, the phosphorus content in steel is usually required to be less than 0.045%, and the requirements for high-quality steel are lower.
Sulfur (S): Sulfur is also a harmful element in general. It makes the steel hot brittle, reduces the ductility and toughness of the steel, and causes cracks during forging and rolling. Sulfur is also detrimental to weldability, reducing corrosion resistance. Therefore, the sulfur content is usually required to be less than 0.055%, and the high-quality steel is required to be less than 0.040%. Adding 0.08-0.20% sulfur to steel can improve machinability, commonly known as free-cutting steel.
S235J0 steel chemical composition, finished product analysis:
| C | Mn | P | S | Cu | N | Ceq Max |
| ≤0.17 | ≤1.4 | ≤0.03 | ≤0.03 | ≤0.55 | ≤0.012 | ≤0.35 |
Remarks on ingredients: when the shape is long, increase P and S by 0.005. Ceq = C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15
S235J0W steel mechanical properties (for transverse):
| Grade | Thickness (mm) | Yield Strength (MPa) | Tensile Strength (MPa) | Elongation A (%) |
| S235J0W | ≤16 | ≥235 | 360-510 | ≥25 |
| 16-40 | ≥225 | 360-510 | ||
| 41-63 | ≥215 | 360-510 | ||
| 63-80 | ≥215 | 360-510 | ≥22 | |
| 80-100 | ≥215 | 360-510 | ||
| 100-150 | ≥195 | 350-500 |
S235J0W steel impact power value:
| Grade | Temperature | Impact Energy J |
| S235J0W | 0 | 27 |
Mechanical properties of S235J0 steel:
| Grade | Shape | Delivery Status | Thickness (mm) | Mechanical properties | |
| S235J0 | Plate, sheet, strip | Hot rolled, normalized | >16-40 | ReH(MPa) | ≥225 |
| Rm(MPa) | 360-510 | ||||
| Impact temperature | 0 | ||||
| Akv(J) | ≥27 | ||||
S235J0W steel is an improved weathering structural steel based on S235J0. S235J0W material is used for welding, bolting and riveting parts. S235J0W steel enhances the ability to resist atmospheric corrosion at ambient temperature. Some specific alloy elements are added to achieve corrosion resistance, such as P, Cu, Cr, Ni, Mo, etc, forming a protective oxide layer on the metal surface under various climatic conditions.
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