1.4305 equivalent grades: ASTM, EN, JIS, GB, DIN
Cross-reference for 1.4305 across standard systems. Each match is graded so you can see how safe the substitution is. Austenitic free-machining stainless steel (sulphur-bearing) — full 1.4305 data sheet.
Cross-reference table
| Grade | System | Match | Why / differences |
|---|---|---|---|
| 303 | AISI / SAE | Identical | UNS S30300 (ASTM A582): C ≤ 0.15, Cr 17–19, Ni 8–10, S ≥ 0.15, Mo ≤ 0.60. 1.4305 caps C at 0.10 and S at 0.35; dual-certified. |
| 303S31 | BS (superseded British) | Identical | BS 970 303S31: C ≤ 0.12, S 0.15–0.35. |
| Y12Cr18Ni9 | GB/T (China) | Identical | GB/T 1220 Y12Cr18Ni9 (formerly Y1Cr18Ni9): free-machining 18/8 with S 0.15–0.35. |
| SUS303 | JIS (Japan) | Identical | JIS G4303 SUS303: C ≤ 0.15, Cr 17–19, Ni 8–10, S ≥ 0.15. |
| 1.4570 | EN (European) | Near | X6CrMoNiS17-12-2 — the free-machining 316 (316F) for chloride service. |
| 1.4301 | EN (European) | Functional | Non-free-machining base grade: better corrosion resistance and weldability, poorer machinability. |
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.
1.4305 in AISI / SAE
- 303 — Identical UNS S30300 (ASTM A582): C ≤ 0.15, Cr 17–19, Ni 8–10, S ≥ 0.15, Mo ≤ 0.60. 1.4305 caps C at 0.10 and S at 0.35; dual-certified.
1.4305 in BS (superseded British)
- 303S31 — Identical BS 970 303S31: C ≤ 0.12, S 0.15–0.35.
1.4305 in GB/T (China)
- Y12Cr18Ni9 — Identical GB/T 1220 Y12Cr18Ni9 (formerly Y1Cr18Ni9): free-machining 18/8 with S 0.15–0.35.
1.4305 in JIS (Japan)
- SUS303 — Identical JIS G4303 SUS303: C ≤ 0.15, Cr 17–19, Ni 8–10, S ≥ 0.15.
1.4305 in EN (European)
- 1.4570 — Near X6CrMoNiS17-12-2 — the free-machining 316 (316F) for chloride service.
- 1.4301 — Functional Non-free-machining base grade: better corrosion resistance and weldability, poorer machinability.
Superseded names for 1.4305
- X10CrNiS18 9 — DIN 17440 (withdrawn): Same number 1.4305.
- 303S31 / 303S21 — BS 970: 303S31 is the closer match.
- Z8CNF18-09 — NF A 35-574
Key data for 1.4305
Full composition, mechanical properties by thickness, heat treatment and applications for 1.4305 →
Verified against EN 10088-3:2014. Last checked: September 2026.