310 equivalent grades: ASTM, EN, JIS, GB, DIN
310 is austenitic heat-resisting stainless steel (25 % Cr, 20 % Ni) specified in ASTM A240. The cross-reference runs across 6 standard systems and grades every candidate, so the reason a substitution is safe is on the same row as the name. The full 310 data sheet carries the composition and mechanical tables.
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310 is cross-certified with 310S24, 1.4845, 06Cr25Ni20 and 1 more: the composition windows overlap closely enough that one certificate satisfies the other. 309 / 309S, 1.4841, 10Kh23N18 / 20Kh23N18 differ on one limit only — a carbon ceiling, an impact temperature or a strength minimum. 321, 253MA / 1.4835 serve the same purpose without being the same steel, so a substitution there needs the design re-checked rather than the certificate. Across systems that is 1 in BS (superseded British), 3 in EN (European), 1 in GB/T (China), 1 in JIS (Japan), 2 in AISI / SAE, 1 in GOST (Russia/CIS).
Cross-reference table
| Grade | System | Match | Why / differences |
|---|---|---|---|
| 310S24 | BS (superseded British) | Identical | BS 1449 310S24 / 310S31. |
| 1.4845 | EN (European) | Identical | X8CrNi25-21: C ≤ 0.10, Cr 24–26, Ni 19–22 — corresponds to 310S; dual-certified. |
| 06Cr25Ni20 | GB/T (China) | Identical | GB/T 20878 06Cr25Ni20 (formerly 0Cr25Ni20). |
| SUS310S | JIS (Japan) | Identical | JIS G4304 SUS310S: C ≤ 0.08, Cr 24–26, Ni 19–22, Si ≤ 1.5. |
| 309 / 309S | AISI / SAE | Near | S30900/S30908 (22–24 Cr, 12–15 Ni): the intermediate heat-resisting grade to ~1000 °C; cheaper, less oxidation and carburization resistance. |
| 1.4841 | EN (European) | Near | X15CrNiSi25-21 (EN 10095): C ≤ 0.20, Si 1.5–2.5 — the higher-carbon, high-Si heat-resisting version closer to plain 310. |
| 10Kh23N18 / 20Kh23N18 | GOST (Russia/CIS) | Near | GOST 5632 20Kh23N18: C ≤ 0.20, Cr 22–25, Ni 17–20 — the Russian 25-20 type; 10Kh23N18 is the lower-carbon version. |
| 321 | AISI / SAE | Functional | Stabilized 18-8 for service to ~870 °C; 310 takes over above that. |
| 253MA / 1.4835 | EN (European) | Functional | S30815: rare-earth/N-alloyed 21-11 grade with higher creep strength at 850–1100 °C at lower Ni cost. |
Identical, near and functional are defined once on the grade index; the reason column below says which limit differs in each case.
310 in BS (superseded British)
- 310S24 — Identical BS 1449 310S24 / 310S31.
310 in EN (European)
- 1.4845 — Identical X8CrNi25-21: C ≤ 0.10, Cr 24–26, Ni 19–22 — corresponds to 310S; dual-certified.
- 1.4841 — Near X15CrNiSi25-21 (EN 10095): C ≤ 0.20, Si 1.5–2.5 — the higher-carbon, high-Si heat-resisting version closer to plain 310.
- 253MA / 1.4835 — Functional S30815: rare-earth/N-alloyed 21-11 grade with higher creep strength at 850–1100 °C at lower Ni cost.
310 in GB/T (China)
- 06Cr25Ni20 — Identical GB/T 20878 06Cr25Ni20 (formerly 0Cr25Ni20).
310 in JIS (Japan)
- SUS310S — Identical JIS G4304 SUS310S: C ≤ 0.08, Cr 24–26, Ni 19–22, Si ≤ 1.5.
310 in AISI / SAE
- 309 / 309S — Near S30900/S30908 (22–24 Cr, 12–15 Ni): the intermediate heat-resisting grade to ~1000 °C; cheaper, less oxidation and carburization resistance.
- 321 — Functional Stabilized 18-8 for service to ~870 °C; 310 takes over above that.
310 in GOST (Russia/CIS)
- 10Kh23N18 / 20Kh23N18 — Near GOST 5632 20Kh23N18: C ≤ 0.20, Cr 22–25, Ni 17–20 — the Russian 25-20 type; 10Kh23N18 is the lower-carbon version.
Superseded names for 310
- 1.4845 / X8CrNi25-21 — EN 10088 / EN 10095: Older DIN name X12CrNi25 21.
- S31000 / S31008 / S31009 — UNS: 310 / 310S / 310H.
- 310S24 / 310S31 — BS 1449 / BS 970
- 25-20 — Colloquial: Named for its Cr/Ni content.
- HK-40 / CK-20 — ACI / ASTM A297, A351: Cast 25-20 grades (HK has 0.4 % C for creep).
Key data for 310
Full composition, mechanical properties by thickness, heat treatment and applications for 310 →
Verified against ASTM A240/A240M-22. Last checked: September 2026.