321 equivalent grades: ASTM, EN, JIS, GB, DIN
Cross-reference for 321 across standard systems. Each match is graded so you can see how safe the substitution is. Austenitic Cr-Ni stainless steel, titanium-stabilized — full 321 data sheet.
Cross-reference table
| Grade | System | Match | Why / differences |
|---|---|---|---|
| 321S31 | BS (superseded British) | Identical | BS 1449 321S31. |
| 1.4541 | EN (European) | Identical | X6CrNiTi18-10: same limits; dual-certified 321/1.4541. |
| 06Cr18Ni11Ti | GB/T (China) | Identical | GB/T 20878 06Cr18Ni11Ti (formerly 0Cr18Ni10Ti). |
| 08Kh18N10T / 12Kh18N10T | GOST (Russia/CIS) | Identical | GOST 5632 08Kh18N10T (C ≤ 0.08) — the standard Russian austenitic; 12Kh18N10T (C ≤ 0.12) ≈ 321H. |
| SUS321 | JIS (Japan) | Identical | JIS G4304 SUS321: C ≤ 0.08, Cr 17–19, Ni 9–13, Ti ≥ 5×C. |
| 347 | AISI / SAE | Near | S34700 / 1.4550: Nb-stabilized twin; Nb transfers through the arc so weld metal is also stabilized; slightly better creep. Interchangeable in most specs. |
| 304H | AISI / SAE | Near | Unstabilized high-carbon 304 for creep service; sensitizes but is cheaper — used where intergranular corrosion is not a concern. |
| 1.4878 | EN (European) | Near | X8CrNiTi18-10 heat-resisting variant (EN 10095) for furnace parts. |
| 304L | AISI / SAE | Functional | Low-carbon route to weld stability; not suitable above ~425 °C for strength. |
| 310 | AISI / SAE | Functional | Stabilized 18-8 for service to ~870 °C; 310 takes over above that. |
Identical = same composition and mechanical limits within rounding. Near = one limit differs (e.g. carbon max or impact temperature). Functional = interchangeable for most uses after an engineering check.
How the matches are graded
Identical means the chemical composition windows overlap so that material certified to one specification meets the other without deviation, and the mechanical minimums are the same or the other is inside them — mills usually dual-certify. Near means one limit differs (a carbon maximum, an impact temperature, a strength minimum or a delivery condition) and a substitution needs a one-line engineering check. Functional means the grades serve the same purpose but are not the same steel — a designer can often use one for the other, but only after re-checking the design.
321 in BS (superseded British)
- 321S31 — Identical BS 1449 321S31.
321 in EN (European)
- 1.4541 — Identical X6CrNiTi18-10: same limits; dual-certified 321/1.4541.
- 1.4878 — Near X8CrNiTi18-10 heat-resisting variant (EN 10095) for furnace parts.
321 in GB/T (China)
- 06Cr18Ni11Ti — Identical GB/T 20878 06Cr18Ni11Ti (formerly 0Cr18Ni10Ti).
321 in GOST (Russia/CIS)
- 08Kh18N10T / 12Kh18N10T — Identical GOST 5632 08Kh18N10T (C ≤ 0.08) — the standard Russian austenitic; 12Kh18N10T (C ≤ 0.12) ≈ 321H.
321 in JIS (Japan)
- SUS321 — Identical JIS G4304 SUS321: C ≤ 0.08, Cr 17–19, Ni 9–13, Ti ≥ 5×C.
321 in AISI / SAE
- 347 — Near S34700 / 1.4550: Nb-stabilized twin; Nb transfers through the arc so weld metal is also stabilized; slightly better creep. Interchangeable in most specs.
- 304H — Near Unstabilized high-carbon 304 for creep service; sensitizes but is cheaper — used where intergranular corrosion is not a concern.
- 304L — Functional Low-carbon route to weld stability; not suitable above ~425 °C for strength.
- 310 — Functional Stabilized 18-8 for service to ~870 °C; 310 takes over above that.
Superseded names for 321
- 1.4541 / X6CrNiTi18-10 — EN 10088: Older DIN name X10CrNiTi18 9; 1.4878 (X8CrNiTi18-10) is the heat-resisting version per EN 10095.
- S32100 / S32109 — UNS: 321 / 321H.
- 321S31 / 321S51 — BS 1449 / BS 970
- AMS 5510 / 5645 — SAE Aerospace: Sheet and bar specifications for aircraft exhaust and manifolds.
Key data for 321
Full composition, mechanical properties by thickness, heat treatment and applications for 321 →
Verified against ASTM A240/A240M-22. Last checked: September 2026.