Stainless Steel Grades Chart: EN, AISI and Chemical Composition

Selected EN-based reference compositions, in mass %. The EN tables retain the reference basis EN 10088-2:2014 and EN 10095, as applicable; check the current product standard and edition required for your order. This abbreviated chart is for orientation, not a complete purchase specification. Common type and UNS references are not guaranteed equivalents. A dash means not listed here, not zero; several elements and standard footnotes are omitted. Values marked ≤ are maxima. Verify the full ordered specification and inspection certificate for the supplied product.

Austenitic stainless steels

EN	EN name	Common type/reference	Related UNS reference	C	Cr	Ni	Mo	Selected other elements
1.4301	X5CrNi18-10	304	S30400	≤0.07	17.5–19.5	8.0–10.5	–	–
1.4307	X2CrNi18-9	304L	S30403	≤0.030	17.5–19.5	8.0–10.5	–	–
1.4401	X5CrNiMo17-12-2	316	S31600	≤0.07	16.5–18.5	10.0–13.0	2.00–2.50	–
1.4404	X2CrNiMo17-12-2	316L	S31603	≤0.030	16.5–18.5	10.0–13.0	2.00–2.50	–
1.4571	X6CrNiMoTi17-12-2	316Ti [1]	S31635 [1]	≤0.08	16.5–18.5	10.5–13.5	2.00–2.50	5×C ≤ Ti ≤0.70 [1]
1.4539	X1NiCrMoCu25-20-5	904L	N08904	≤0.020	19.0–21.0	24.0–26.0	4.0–5.0	Cu 1.20–2.00; N ≤0.15
1.4541	X6CrNiTi18-10	321 [1]	S32100 [1]	≤0.08	17.0–19.0	9.0–12.0	–	5×C ≤ Ti ≤0.70 [1]
1.4310	X10CrNi18-8	301	S30100	0.05–0.15	16.0–19.0	6.0–9.5	≤0.80	–
1.4372	X12CrMnNiN17-7-5	201	S20100	≤0.15	16.0–18.0	3.5–5.5	–	Mn 5.5–7.5; N 0.05–0.25

Ferritic stainless steels

EN	EN name	Common type/reference	Related UNS reference	C	Cr	Mo	Selected other elements
1.4016	X6Cr17	430	S43000	≤0.08	16.0–18.0	–	–
1.4512	X2CrTi12	409 family / 409L [2]	S40910 [2]	≤0.030	10.5–12.5	–	6×(C+N) ≤ Ti ≤0.65
1.4509	X2CrTiNb18	441 (common name)	S43940	≤0.030	17.5–18.5	–	Ti 0.10–0.60; 3×C+0.30 ≤ Nb ≤1.00
1.4510	X3CrTi17	439	S43035	≤0.05	16.0–18.0	–	4×(C+N)+0.15 ≤ Ti ≤0.80 [1]
1.4521	X2CrMoTi18-2	444	S44400	≤0.025	17.0–20.0	1.80–2.50	4×(C+N)+0.15 ≤ Ti ≤0.80 [1]
1.4113	X6CrMo17-1	434	S43400	≤0.08	16.0–18.0	0.90–1.40	–
1.4003	X2CrNi12	–	S41003	≤0.030	10.5–12.5	–	Ni 0.30–1.00

Duplex stainless steels

EN	EN name	Common type/reference	Related UNS reference	C	Cr	Ni	Mo	N and other elements
1.4362	X2CrNiN23-4	2304	S32304	≤0.030	22.0–24.5	3.5–5.5	0.10–0.60	0.05–0.20; Cu 0.10–0.60
1.4462	X2CrNiMoN22-5-3	2205 [3]	S31803 / S32205 [3]	≤0.030	21.0–23.0	4.5–6.5	2.50–3.50	0.10–0.22

Heat-resisting and martensitic grades

EN	EN name	Common type/reference	Related UNS reference	C	Cr	Ni	Selected other elements
1.4828	X15CrNiSi20-12	–	–	≤0.20	19.0–21.0	11.0–13.0	Si 1.50–2.50
1.4833	X12CrNi23-13	309S [4]	S30908 [4]	≤0.15	22.0–24.0	12.0–14.0	–
1.4845	X8CrNi25-21	310S [4]	S31008 [4]	≤0.10	24.0–26.0	19.0–22.0	–
1.4006	X12Cr13	410	S41000	0.08–0.15	11.5–13.5	≤0.75	–
1.4021	X20Cr13	420 [5]	S42000 [5]	0.16–0.25	12.0–14.0	–	–

Important grade-reference notes

[1] Stabilization criteria vary with the product standard and grade variant, including Ti/Nb and C/N relationships. The EN-reference expressions shown do not replace the ordered ASTM or product-standard requirements.

[2] The 409 family includes distinct UNS variants. The displayed EN-reference chemistry does not guarantee S40910 compliance.

[3] S31803 and S32205 are not identical; S32205 has narrower chemistry limits. The displayed EN ranges are not S32205 limits. Confirm dual certification for the supplied product.

[4] ASTM 309S/S30908 and 310S/S31008 require C ≤0.08%; the EN-reference maxima displayed here differ. Specify and verify the required standard and grade. EN 1.4828 is not automatically equivalent to ASTM 309/S30900.

[5] Type 420 is associated with several EN carbon variants; this table shows 1.4021 specifically.

Additional grade references: 309, 440A and 440C

The following abbreviated compositions follow ASTM A276 (bars and shapes), not the EN basis of the tables above. EN counterparts are deliberately not assigned. These references do not imply stock availability; omitted elements and product requirements must be checked.

Common type/reference	UNS	C	Cr	Ni	Mo	Reference
309	S30900	≤0.20	22–24	12–15	–	ASTM A276
440A	S44002	0.60–0.75	16–18	–	≤0.75	ASTM A276
440C	S44004	0.95–1.20	16–18	–	≤0.75	ASTM A276

Reference standards: EN 10088-2 and EN 10095 for the tables above; ASTM A240/A240M for 309S, 310S, S31803 and S32205 (notes 3 and 4); ASTM A276/A276M for 309, 440A and 440C.