304L (UNS S30403)
USApproximate matchASTM · ASTM A240 / A276
The 304/304L family groups the world's most widely used chromium-nickel (18/8) austenitic stainless grades, valued for their good balance of corrosion resistance, formability, weldability and cost. Found in appliances, food service, food processing, architecture and piping in low-chloride environments. The low-carbon 304L variant improves intergranular corrosion resistance after welding, at the cost of a slightly lower minimum mechanical strength.
| Grade | Region | Standard | Re (MPa) | Rm (MPa) | Delta |
|---|---|---|---|---|---|
| 304L (UNS S30403) | US | ASTM A240 / A276 | 170 | ≥485 | reference |
| SUS304L | JP | JIS G4303:2012 | 170 | ≥480 | 0% |
| 1.4307 (X2CrNi18-9) | EU | EN 10088-1:2014 | 175 | 500–700 | +3% |
| STS304L | KR | KS D 3698:2008 | 175 | ≥480 | +3% |
| Neighboring grades — different strength | |||||
| 304 (UNS S30400) | US | ASTM A240 / A276 | 205 | ≥515 | +21% |
| SUS304 | JP | JIS G4303:2012 | 205 | ≥520 | +21% |
| STS304 | KR | KS D 3698:2008 | 205 | ≥520 | +21% |
| 1.4301 (X5CrNi18-10) | EU | EN 10088-1:2014 | 210 | 520–720 | +24% |
| Grade | C | Mn | Si | P | S | Cr | Ni | Mo | N |
|---|---|---|---|---|---|---|---|---|---|
| 304L (UNS S30403) | ≤0.03 | ≤2 | ≤0.75 | ≤0.045 | ≤0.03 | 18–20 | 8–12 | — | ≤0.1 |
| SUS304L | ≤0.03 | ≤2 | ≤1 | ≤0.045 | ≤0.03 | 18–20 | 9–13 | — | — |
| 1.4307 (X2CrNi18-9) | ≤0.03 | ≤2 | ≤1 | ≤0.045 | ≤0.03 | 17.5–19.5 | 8–10.5 | — | ≤0.1 |
| STS304L | ≤0.03 | ≤2 | ≤1 | ≤0.045 | ≤0.03 | 18–20 | 9–13 | — | — |
| 304 (UNS S30400) | ≤0.08 | ≤2 | ≤0.75 | ≤0.045 | ≤0.03 | 18–20 | 8–10.5 | — | ≤0.1 |
| SUS304 | ≤0.08 | ≤2 | ≤1 | ≤0.045 | ≤0.03 | 18–20 | 8–10.5 | — | — |
| STS304 | ≤0.08 | ≤2 | ≤1 | ≤0.045 | ≤0.03 | 18–20 | 8–10.5 | — | — |
| 1.4301 (X5CrNi18-10) | ≤0.07 | ≤2 | ≤1 | ≤0.045 | ≤0.015 | 17.5–19.5 | 8–10.5 | — | ≤0.11 |
Note: Low-carbon version (C≤0.03%) with a widened nickel range (8-12% vs. 8-10.5% for standard 304) to partly offset the strength loss from reduced carbon.
Values compiled from public sources for guidance only — always verify against the official standard before use in design or fabrication.