STPG370 vs STPG410
These two grades are listed as equivalents of each other: their chemistry windows overlap and they serve the same applications. They are not always identical — check the differences below before substituting, especially in certified designs.
STPG370
Pipe & Tube Steel
STPG370 is the JIS G3454 carbon steel pipe for pressure service at the 370 MPa tensile level — the Japanese counterpart class to ASTM A106 Grade A. It is a fully chemistry-controlled pipe grade (unlike the SS structural grades) for pressure piping up to about 350 °C.
Standards: DIN P235TR1 type (near) · AISI A106 Gr.A type (near) · JIS STPG370 (JIS G3454) · GB 20 (near)
STPG410
Pipe & Tube Steel
STPG410 is the higher-strength JIS G3454 pressure pipe grade, the counterpart class to ASTM A106 Grade B — the most widely specified carbon pressure-pipe level in Japanese plant engineering, with tensile strength of at least 410 MPa.
Standards: DIN P265GH type (near) · AISI A106 Gr.B (near) · JIS STPG410 (JIS G3454) · GB 20G type (near)
Chemical composition compared (%)
| Element | STPG370 | STPG410 |
|---|---|---|
| C | ≤0.25 | ≤0.30 |
| Si | ≤0.35 | ≤0.35 |
| Mn | 0.30–0.90 | 0.30–1.00 |
| P | ≤0.040 | ≤0.040 |
| S | ≤0.040 | ≤0.040 |
Properties compared
| Property | STPG370 | STPG410 |
|---|---|---|
| Tensile strength | ≥370 MPa | ≥410 MPa |
| Yield strength | ≥215 MPa | ≥245 MPa |
| Density | 7.85 g/cm³ | 7.85 g/cm³ |
| Product form | Carbon steel pipe for pressure service (JIS G3454) | Carbon steel pipe for pressure service (JIS G3454) |
Sourcing either grade?
Nasteel stocks both families from Shenzhen with EN 10204 3.1 mill certificates by heat number.
Ask for a quotationSee full data sheets: STPG370 · STPG410. Substitution decisions for certified parts stay with the design authority.