ISO 15510
Chemical composition and designations for stainless steels; a companion reference to product specifications.
Stainless steel chemistry
Chemical composition and designations for stainless steels; a companion reference to product specifications.
Data edition: ISO 15510:2014
Material requirements. Defined by product form.
Chemical composition and designations for stainless steels; a companion reference to product specifications.
ISO 15510 defines chemistry, not plate, sheet or strip mechanical acceptance values. The SS309 and SS310 links identify the ISO compositions shown, rather than claiming all 309/309S or 310/310S variants are identical.
Find your material grade
18 material references with ISO 15510 data.
ISO 15510 properties
Select a table to compare requirements.
| Grade / designation | C | Si | Mn | P | S | Cr | Ni | Mo | N | Other elements |
|---|---|---|---|---|---|---|---|---|---|---|
| SS304 4301-304-00-I | ≤0.07 | ≤1.00 | ≤2.00 | ≤0.045 | ≤0.030 | 17.5–19.5 | 8.0–10.5 | — | ≤0.10 | — |
| SS304L 4307-304-03-I | ≤0.030 | ≤1.00 | ≤2.00 | ≤0.045 | ≤0.030 | 17.5–19.5 | 8.0–10.5 | — | ≤0.10 | — |
| SS316 4401-316-00-I | ≤0.08 | ≤1.00 | ≤2.00 | ≤0.045 | ≤0.030 | 16.0–18.0 | 10.0–13.0 | 2.00–3.00 | ≤0.10 | — |
| SS316L 4404-316-03-I | ≤0.030 | ≤1.00 | ≤2.00 | ≤0.045 | ≤0.030 | 16.5–18.5 | 10.0–13.0 | 2.00–3.00 | ≤0.10 | — |
| SS317L 4438-317-03-I | ≤0.030 | ≤1.00 | ≤2.00 | ≤0.045 | ≤0.030 | 17.5–20.0 | 12.0–15.0 | 3.0–4.0 | ≤0.10 | — |
| SS321 4541-321-00-I | ≤0.08 | ≤1.00 | ≤2.00 | ≤0.045 | ≤0.030 | 17.0–19.0 | 9.0–12.0 | — | — | Ti: 5 × C to 0.70 |
| SS347 4550-347-00-I | ≤0.08 | ≤1.00 | ≤2.00 | ≤0.045 | ≤0.030 | 17.0–19.0 | 9.0–12.0 | — | — | Nb: 10 × C to 1.00 |
| SS904L 4539-089-04-I | ≤0.020 | ≤0.75 | ≤2.00 | ≤0.035 | ≤0.015 | 19.0–22.0 | 23.5–26.0 | 4.0–5.0 | ≤0.15 | Cu: 1.00–2.00 |
| 254 SMO 4547-312-54-I | ≤0.020 | ≤0.70 | ≤1.00 | ≤0.035 | ≤0.015 | 19.5–20.5 | 17.5–18.5 | 6.0–7.0 | 0.18–0.25 | Cu: 0.50–1.00 |
| Duplex 2205 4462-318-03-I | ≤0.030 | ≤1.00 | ≤2.00 | ≤0.035 | ≤0.015 | 21.0–23.0 | 4.5–6.5 | 2.5–3.5 | 0.10–0.22 | — |
| Duplex S31803 4462-318-03-I | ≤0.030 | ≤1.00 | ≤2.00 | ≤0.035 | ≤0.015 | 21.0–23.0 | 4.5–6.5 | 2.5–3.5 | 0.10–0.22 | — |
| Super Duplex 2507 4410-327-50-E | ≤0.030 | ≤1.00 | ≤2.00 | ≤0.035 | ≤0.015 | 24.0–26.0 | 6.0–8.0 | 3.0–4.5 | 0.24–0.35 | — |
| SS309 4833-309-08-I | ≤0.20 | ≤1.00 | ≤2.00 | ≤0.045 | ≤0.030 | 22.0–24.0 | 12.0–15.0 | — | ≤0.10 | — |
| SS310 4845-310-08-E | ≤0.10 | ≤1.50 | ≤2.00 | ≤0.045 | ≤0.030 | 24.0–26.0 | 19.0–22.0 | — | ≤0.10 | — |
| Incoloy 800 4876-088-00-I | ≤0.10 | ≤1.00 | ≤1.50 | ≤0.015 | ≤0.015 | 19.0–23.0 | 30.0–34.0 | — | — | Al: 0.15–0.60; Ti: 0.15–0.60; Cu ≤0.70 |
| Incoloy 800H 4959-088-10-U | 0.05–0.10 | ≤1.00 | ≤1.50 | ≤0.045 | ≤0.015 | 19.0–23.0 | 30.0–35.0 | — | — | Al: 0.15–0.60; Ti: 0.15–0.60; Cu ≤0.75; Fe ≥39.5 |
| Incoloy 800HT 4959-088-11-U | 0.06–0.10 | ≤1.00 | ≤1.50 | ≤0.040 | ≤0.015 | 19.0–23.0 | 30.0–35.0 | — | — | Al: 0.15–0.60; Ti: 0.15–0.60; Al + Ti: 0.85–1.20; Cu ≤0.75; Fe ≥39.5 |
| Alloy 20 4657-080-20-U | ≤0.07 | ≤1.00 | ≤2.00 | ≤0.045 | ≤0.035 | 19.0–21.0 | 32.0–38.0 | 2.00–3.00 | — | Cu: 3.0–4.0; Nb: 8 × C to 1.00 |
Composition in mass %. ≤ denotes a maximum; ≥ denotes a minimum; paired values are ranges. — means no numerical limit is provided in the cited data, not zero.
| Grade / designation | Form | Thickness (mm) | Condition | Test direction | Rp0.2 (MPa) | Rp1.0 min (MPa) | Rm (MPa) | A80 min (%) | A min (%) | Other requirements |
|---|---|---|---|---|---|---|---|---|---|---|
| SS304 4301-304-00-I | — | — | — | — | — | — | — | — | — | — |
| SS304L 4307-304-03-I | — | — | — | — | — | — | — | — | — | — |
| SS316 4401-316-00-I | — | — | — | — | — | — | — | — | — | — |
| SS316L 4404-316-03-I | — | — | — | — | — | — | — | — | — | — |
| SS317L 4438-317-03-I | — | — | — | — | — | — | — | — | — | — |
| SS321 4541-321-00-I | — | — | — | — | — | — | — | — | — | — |
| SS347 4550-347-00-I | — | — | — | — | — | — | — | — | — | — |
| SS904L 4539-089-04-I | — | — | — | — | — | — | — | — | — | — |
| 254 SMO 4547-312-54-I | — | — | — | — | — | — | — | — | — | — |
| Duplex 2205 4462-318-03-I | — | — | — | — | — | — | — | — | — | — |
| Duplex S31803 4462-318-03-I | — | — | — | — | — | — | — | — | — | — |
| Super Duplex 2507 4410-327-50-E | — | — | — | — | — | — | — | — | — | — |
| SS309 4833-309-08-I | — | — | — | — | — | — | — | — | — | — |
| SS310 4845-310-08-E | — | — | — | — | — | — | — | — | — | — |
| Incoloy 800 4876-088-00-I | — | — | — | — | — | — | — | — | — | — |
| Incoloy 800H 4959-088-10-U | — | — | — | — | — | — | — | — | — | — |
| Incoloy 800HT 4959-088-11-U | — | — | — | — | — | — | — | — | — | — |
| Alloy 20 4657-080-20-U | — | — | — | — | — | — | — | — | — | — |
—: ISO 15510 does not prescribe mechanical-property acceptance limits. Use the applicable flat-product standard for strength, elongation, thickness and delivery-condition requirements.
Specification source
Technical data above is identified by its source edition: ISO 15510:2014.