1.4305 equivalent grades: ASTM, EN, JIS, GB, DIN
1.4305 is austenitic free-machining stainless steel (sulphur-bearing) specified in EN 10088-3. What follows is the substitution list: 5 standard systems, and for each candidate the clause that makes it an exact match or stops it being one. The full 1.4305 data sheet carries the composition and mechanical tables.
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Where a drawing says 1.4305, 303, 303S31, Y12Cr18Ni9 and 1 more satisfies it as written, with no concession needed. The near matches are 1.4570; what differs is the tested condition, not the alloy. 1.4301 serves 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 Across systems that is 1 in AISI / SAE, 1 in BS (superseded British), 1 in GB/T (China), 1 in JIS (Japan), 2 in EN (European).
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| 303S31 | BS (superseded British) | Identical | BS 970 303S31: C ≤ 0.12, S 0.15–0.35.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, near and functional are defined once on the grade index; the reason column below says which limit differs in each case.
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1.4305 in BS (superseded British)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.