COMPOSITIONS OF VARIOUS GRADES OF STAINLESS STEEL

COMPOSITION OF VARIOUS GRADES OF STAINLESS STEELS

Austenitic

SAE designation	UNS designation	%Cr	% Ni	% C	% Mn	% Si	% P	% S	% N	Other
201	S20100	16-18	3.5–5.5	0.15	5.5-7.5	0.75	0.06	0.03	0.25	–
202	S20200	17-19	4–6	0.15	7.5-10.0	0.75	0.06	0.03	0.25	–
205	S20500	16.5-18	1–1.75	0.12–0.25	14-15.5	0.75	0.06	0.03	0.32-0.40	–
254	S31254	20	18	0.02 max	–	–	–	–	0.20	6 Mo;0.75 Cu;”Super austenitic”;All values nominal
301	S30100	16–18	6-8	0.15	2	0.75	0.045	0.03	–	–
302	S30200	17–19	8-10	0.15	2	0.75	0.045	0.03	0.1	–
302B	S30215	17–19	8-10	0.15	2	2.0-3.0	0.045	0.03	–	–
303	S30300	17–19	8-10	0.15	2	1	0.2	0.15 min	–	Mo 0.60 (optional)
303 Se	S30323	17–19	8-10	0.15	2	1	0.2	0.06	–	0.15 Se min
304	S30400	18–20	8-10.50	0.08	2	0.75	0.045	0.03	0.1	–
304L	S30403	18-20	8-12	0.03	2	0.75	0.045	0.03	0.1	–
304Cu	S30430	17–19	8-10	0.08	2	0.75	0.045	0.03	–	3-4 Cu
304N	S30451	18–20	8-10.50	0.08	2	0.75	0.045	0.03	0.10-0.16	–
305	S30500	17–19	10.50-13	0.12	2	0.75	0.045	0.03	–	–
308	S30800	19–21	10-12	0.08	2	1	0.045	0.03	–	–
309	S30900	22–24	12-15	0.2	2	1	0.045	0.03	–	–
309S	S30908	22–24	12-15	0.08	2	1	0.045	0.03	–	–
310	S31000	24–26	19-22	0.25	2	1.5	0.045	0.03	–	–
310S	S31008	24–26	19-22	0.08	2	1.5	0.045	0.03	–	–
314	S31400	23–26	19-22	0.25	2	1.5-3.0	0.045	0.03	–	–
316	S31600	16–18	10-14	0.08	2	0.75	0.045	0.03	0.10	2.0-3.0 Mo
316L	S31603	16–18	10-14	0.03	2	0.75	0.045	0.03	0.10	3.0-4.0 Mo
316F	S31620	16-18	10-14	0.08	2	1	0.2	0.10 min	–	1.75-2.50 Mo
316N	S31651	16-18	10-14	0.08	2	0.75	0.045	0.03	0.10-0.16	2.0-3.0 Mo
317	S31700	18–20	11-15	0.08	2	0.75	0.045	0.03	0.10 max	3.0-4.0 Mo
317L	S31703	18–20	11-15	0.03	2	0.75	0.045	0.03	0.10 max	3.0-4.0 Mo
321	S32100	17–19	9-12	0.08	2	0.75	0.045	0.03	0.10 max	Ti 5 (C+N) min, 0.70 max
329	S32900	23–28	2.5-5	0.08	2	0.75	0.04	0.03	–	1-2 Mo
330	N08330	17–20	34-37	0.08	2	0.75-1.50	0.04	0.03	–	–
347	S34700	17–19	9-13	0.08	2	0.75	0.045	0.030	–	Nb+Ta,10 x C min, 1 max
348	S34800	17–19	9-13	0.08	2	0.75	0.045	0.030	–	Nb+Ta,10 x C min, 1 max, but 0.10 Ta max; 0.20Ca
384	S38400	15–17	17-19	0.08	2	1	0.045	0.03	–	–

Ferritic

SAE designation	UNS designation	%Cr	% Ni	% C	% Mn	% Si	% P	% S	% N	Other
405	S40500	11.5-14.5	–	0.08	1	1	0.04	0.03	–	0.1-0.3 Al, 0.60 max
409	S40900	10.5-11.75	0.05	0.08	1	1	0.045	0.03	–	Ti 6 x C, but 0.75 max
429	S42900	14-16	0.75	0.12	1	1	0.04	0.03	–	–
430	S43000	16-18	0.75	0.12	1	1	0.04	0.03	–	–
430F	S43020	16-18	–	0.12	1.25	1	0.06	0.15 min	–	0.60 Mo (optional)
430FSe	S43023	16-18	–	0.12	1.25	1	0.06	0.06	–	0.15 Se min
434	S43400	16-18	–	0.12	1	1	0.04	0.03	–	0.75-1.25 Mo
436	S43600	16-18	–	0.12	1	1	0.04	0.03	–	0.75-1.25 Mo; Nb + Ta 5 x C min, 0.70 max
442	S44200	18-23	–	0.2	1	1	0.04	0.03	–	–
446	S44600	23-27	0.25	0.2	1.5	1	0.04	0.03	–	–

Martensitic

SAE designation	UNS designation	%Cr	% Ni	% C	% Mn	% Si	% P	% S	% N	Other
403	S40300	11.5-13.0	0.60	0.15	1	0.5	0.04	0.03	–	–
410	S41000	11.5-13.5	0.75	0.15	1	1	0.04	0.03	–	–
414	S41400	11.5-13.5	1.25-2.50	0.15	1	1	0.04	0.03	–	–
416	S41600	12-14	–	0.15	1.25	1	0.06	0.15 min	–	0.060 Mo (optional)
416Se	S41623	12-14	–	0.15	1.25	1	0.06	0.06	–	0.15 Se min
420	S42000	12-14	–	0.15 min	1	1	0.04	0.03	–	–
420F	S42020	12-14	–	0.15 min	1.25	1	0.06	0.15 min	–	0.60 Mo max (optional)
422	S42200	11.0-12.5	0.50-1.0	0.20-0.25	0.5-1.0	0.5	0.025	0.025	–	0.90-1.25 Mo;0.20-0.30V; 0.90-1.25W
431	S41623	15-17	1.25-2.50	0.2	1	1	0.04	0.03	–	–
440A	S44002	16-18	–	0.60-0.75	1	1	0.04	0.03	–	0.75 Mo
440B	S44003	16-18	–	0.75-0.95	1	1	0.04	0.03	–	0.75 Mo
440C	S44004	16-18	–	0.95-1.20	1	1	0.04	0.03	–	0.75 Mo

Heat Resisting

SAE designation	UNS designation	%Cr	% Ni	% C	% Mn	% Si	% P	% S	% N	Other
501	S50100	4-6	–	0.10 min	1	1	0.04	0.03	–	0.40-0.65 Mo
502	S50200	4-6	–	0.1	1	1	0.04	0.03	–	0.40-0.65 Mo

Duplex

SAE designation	UNS designation	%Cr	% Ni	% C	% Mn	% Si	% P	% S	% N	Other
2205	S31803 S32205	22	5	0.03 max	–	–	–	–	0.15	3 Mo; All values nominal
2304	S32304	23	4	0.03 max	–	1.00 max	0.04 max	0.04 max	0.15	0.10-0.60 Mo

Super duplex

SAE designation	UNS designation	%Cr	% Ni	% C	% Mn	% Si	% P	% S	% N	Other
2507	S32750	25	7	0.03 max	–	–	–	–	0.28	4 Mo; All values nominal

Martensitic Precipitation hardening

SAE designation	UNS designation	%Cr	% Ni	% C	% Mn	% Si	% P	% S	% N	Other
630	S17400	15-17	3-5	0.07	1	1	0.04	0.03	–	Cu 3-5, Ta 0.15-0.45

Disclaimer: This is an informative article only if going for any composition adoption please go through the text books.

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