SS400 is a common carbon structural steel under the Japanese JIS G3101 standard, belonging to the "tensile strength 400MPa grade" structural steel. Its designation means: "S" stands for Steel, "S" stands for Structure, and "400" indicates a minimum tensile strength of 400MPa. This standard belongs to the same basic structural steel system as the American ASTM A36, but specific specifications differ.
A36 American standard steel plate belongs to the category of carbon structural steel plates.
This steel conforms to the ASTM A36/A36M-03a standard, which is mainly applicable to riveted, bolted, and welded structures in bridges, buildings, and other fields. It also covers general-purpose structural steel quality carbon steel sections, plates, and bars.
Chemical Composition Comparison Table of A36 and SS400
| Element | A36 (ASTM A36) | SS400 (JIS G3101) |
|---|---|---|
| Carbon (C) | ≤0.25% | ≤0.29% |
| Manganese (Mn) | 0.80-1.20% | ≤1.40% |
| Silicon (Si) | ≤0.40% | ≤0.35% |
| Phosphorus (P) | ≤0.04% | ≤0.050% |
| Sulfur (S) | ≤0.05% | ≤0.050% |
| Copper (Cu) | ≥0.20% (when specified as copper steel) | - |
Mechanical Properties Comparison Table of A36 and SS400
| Property | A36 (ASTM A36) | SS400 (JIS G3101) |
|---|---|---|
| Tensile Strength | 400–550 MPa | 400–510 MPa |
| Yield Strength | ≥250 MPa | 245 MPa |
| Elongation After Fracture | >20% | - |
| Impact Toughness | At room temperature to 0°F | - |
| Hardness | Brinell hardness value 137–155 | - |
A36 and SS400 Hollow section factory
