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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1.4305 is cross-certified with 303, 303S31, Y12Cr18Ni9 and 1 more: the composition windows overlap closely enough that one certificate satisfies the other. 1.4570 sit one step away, differs in a strength minimum or in the quality class rather than in the metallurgy. 1.4301 serves in the same applications, but the composition differs enough that the engineer signs it off, not the buyer. Counted by system: 1 in AISI / SAE, 1 in BS (superseded British), 1 in GB/T (China), 1 in JIS (Japan), 2 in EN (European).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| 303S31 | BS (superseded British) | Identical | BS 970 303S31: C ≤ 0.12, S 0.15–0.35.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1.4305 in BS (superseded British)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.