API 5L Grade B / L245
USApproximate matchAPI · API Spec 5L (46e éd.), PSL1
Family of seamless or welded carbon steel pipes used to convey fluids (steam, water, hydrocarbons, compressed air) at moderate pressure and temperature, generally up to 350-400°C. The industry's historical reference: ASTM A106 Grade B and API 5L Grade B in the United States, with close equivalents in Europe (EN 10216-1), Japan (JIS G3454) and South Korea (KS D3562, harmonized with the Japanese standard).
| Grade | Region | Standard | Re (MPa) | Rm (MPa) | Delta |
|---|---|---|---|---|---|
| API 5L Grade B / L245 | US | API Spec 5L (46e éd.), PSL1 | 245 | ≥415 | reference |
| A106 Grade B | US | ASTM A106/A106M-19 (ASME SA-106) | 240 | ≥415 | -2% |
| P235TR1 (1.0254) | EU | EN 10216-1:2013 | 235 | 360–500 | -4% |
| P265TR1 (1.0258) | EU | EN 10216-1:2013 | 265 | 410–570 | +8% |
| SPPS380 (anciennement SPPS38) | KR | KS D3562 | 220 | ≥380 | -10% |
| Neighboring grades — different strength | |||||
| STPG370 (anciennement STPG38) | JP | JIS G3454:2018 | 215 | ≥370 | -12% |
| Grade | C | Mn | Si | P | S | Cr | Ni | Mo | Cu | V |
|---|---|---|---|---|---|---|---|---|---|---|
| API 5L Grade B / L245 | ≤0.28 | ≤1.2 | — | ≤0.03 | ≤0.03 | ≤0.5 | ≤0.5 | ≤0.15 | ≤0.5 | — |
| A106 Grade B | ≤0.3 | 0.29–1.06 | ≥0.1 | ≤0.035 | ≤0.035 | ≤0.4 | ≤0.4 | ≤0.15 | ≤0.4 | ≤0.08 |
| P235TR1 (1.0254) | ≤0.16 | ≤1.2 | ≤0.35 | ≤0.025 | ≤0.02 | ≤0.3 | ≤0.3 | ≤0.08 | ≤0.3 | ≤0.02 |
| P265TR1 (1.0258) | ≤0.2 | ≤1.4 | ≤0.4 | ≤0.025 | ≤0.02 | ≤0.3 | ≤0.3 | ≤0.08 | ≤0.3 | ≤0.02 |
| SPPS380 (anciennement SPPS38) | ≤0.25 | 0.3–0.9 | ≤0.35 | ≤0.04 | ≤0.04 | — | — | — | — | — |
| STPG370 (anciennement STPG38) | ≤0.25 | 0.3–0.9 | ≤0.35 | ≤0.04 | ≤0.04 | — | — | — | — | — |
Note: A standard dedicated to transmission pipelines (gas/oil) rather than plant piping circuits, but very close to A106 Gr B in mechanical properties. Maximum carbon is slightly reduced to 0.26% for welded pipe (vs. 0.28% for seamless). PSL1 does not require a mandatory Charpy test, unlike PSL2.
Values compiled from public sources for guidance only — always verify against the official standard before use in design or fabrication.