Stainless Steel Composition Chart (AISI 201-384, 403-440C, PH Grades) | Aobo Steel

Stainless Steel Reference Data

Stainless Steel Composition Chart

Chemical composition limits for the standard AISI stainless steel types — the austenitic, ferritic, duplex, martensitic and precipitation-hardening families. Ranges are in weight percent; a single value is a maximum unless marked “min”.

wt % all values 16.0-18.0 from–to range 0.15 min minimum content 0.045 maximum limit — not specified (a)–(b) footnote

Type	UNS	C	Mn	Si	Cr	Ni	P	S	Other
Austenitic Types
201	S20100	0.15	5.5-7.5	1.00	16.0-18.0	3.5-5.5	0.06	0.03	0.25 N
202	S20200	0.15	7.5-10.0	1.00	17.0-19.0	4.0-6.0	0.06	0.03	0.25 N
205	S20500	0.12-0.25	14.0-15.5	1.00	16.5-18.0	1.0-1.75	0.06	0.03	0.32-0.40 N
301	S30100	0.15	2.00	1.00	16.0-18.0	6.0-8.0	0.045	0.03	—
302	S30200	0.15	2.00	1.00	17.0-19.0	8.0-10.0	0.045	0.03	—
302B	S30215	0.15	2.00	2.0-3.0	17.0-19.0	8.0-10.0	0.045	0.03	—
303	S30300	0.15	2.00	1.00	17.0-19.0	8.0-10.0	0.20	0.15 min	0.6 Mo (b)
303Se	S30323	0.15	2.00	1.00	17.0-19.0	8.0-10.0	0.20	0.06	0.15 min Se
304	S30400	0.08	2.00	1.00	18.0-20.0	8.0-10.5	0.045	0.03	—
304H	S30409	0.04-0.10	2.00	1.00	18.0-20.0	8.0-10.5	0.045	0.03	—
304L	S30403	0.03	2.00	1.00	18.0-20.0	8.0-12.0	0.045	0.03	—
304LN	S30453	0.03	2.00	1.00	18.0-20.0	8.0-12.0	0.045	0.03	0.10-0.16 N
302Cu	S30430	0.08	2.00	1.00	17.0-19.0	8.0-10.0	0.045	0.03	3.0-4.0 Cu
304N	S30451	0.08	2.00	1.00	18.0-20.0	8.0-10.5	0.045	0.03	0.10-0.16 N
305	S30500	0.12	2.00	1.00	17.0-19.0	10.5-13.0	0.045	0.03	—
308	S30800	0.08	2.00	1.00	19.0-21.0	10.0-12.0	0.045	0.03	—
309	S30900	0.20	2.00	1.00	22.0-24.0	12.0-15.0	0.045	0.03	—
309S	S30908	0.08	2.00	1.00	22.0-24.0	12.0-15.0	0.045	0.03	—
310	S31000	0.25	2.00	1.50	24.0-26.0	19.0-22.0	0.045	0.03	—
310S	S31008	0.08	2.00	1.50	24.0-26.0	19.0-22.0	0.045	0.03	—
314	S31400	0.25	2.00	1.5-3.0	23.0-26.0	19.0-22.0	0.045	0.03	—
316	S31600	0.08	2.00	1.00	16.0-18.0	10.0-14.0	0.045	0.03	2.0-3.0 Mo
316F	S31620	0.08	2.00	1.00	16.0-18.0	10.0-14.0	0.20	0.10 min	1.75-2.5 Mo
316H	S31609	0.04-0.10	2.00	1.00	16.0-18.0	10.0-14.0	0.045	0.03	2.0-3.0 Mo
316L	S31603	0.03	2.00	1.00	16.0-18.0	10.0-14.0	0.045	0.03	2.0-3.0 Mo
316LN	S31653	0.03	2.00	1.00	16.0-18.0	10.0-14.0	0.045	0.03	2.0-3.0 Mo; 0.10-0.16 N
316N	S31651	0.08	2.00	1.00	16.0-18.0	10.0-14.0	0.045	0.03	2.0-3.0 Mo; 0.10-0.16 N
317	S31700	0.08	2.00	1.00	18.0-20.0	11.0-15.0	0.045	0.03	3.0-4.0 Mo
317L	S31703	0.03	2.00	1.00	18.0-20.0	11.0-15.0	0.045	0.03	3.0-4.0 Mo
321	S32100	0.08	2.00	1.00	17.0-19.0	9.0-12.0	0.045	0.03	5 × %C min Ti
321H	S32109	0.04-0.10	2.00	1.00	17.0-19.0	9.0-12.0	0.045	0.03	5 × %C min Ti
330	N08330	0.08	2.00	0.75-1.5	17.0-20.0	34.0-37.0	0.04	0.03	—
347	S34700	0.08	2.00	1.00	17.0-19.0	9.0-13.0	0.045	0.03	10 × %C min Nb
347H	S34709	0.04-0.10	2.00	1.00	17.0-19.0	9.0-13.0	0.045	0.03	8 × %C min – 1.0 max Nb
348	S34800	0.08	2.00	1.00	17.0-19.0	9.0-13.0	0.045	0.03	0.2 Co; 10 × %C min Nb; 0.10 Ta
348H	S34809	0.04-0.10	2.00	1.00	17.0-19.0	9.0-13.0	0.045	0.03	0.2 Co; 8 × %C min – 1.0 max Nb; 0.10 Ta
384	S38400	0.08	2.00	1.00	15.0-17.0	17.0-19.0	0.045	0.03	—
Ferritic types
405	S40500	0.08	1.00	1.00	11.5-14.5	—	0.04	0.03	0.10-0.30 Al
409	S40900	0.08	1.00	1.00	10.5-11.75	0.50	0.045	0.045	6 × %C min – 0.75 max Ti
429	S42900	0.12	1.00	1.00	14.0-16.0	—	0.04	0.03	—
430	S43000	0.12	1.00	1.00	16.0-18.0	—	0.04	0.03	—
430F	S43020	0.12	1.25	1.00	16.0-18.0	—	0.06	0.15 min	0.6 Mo (b)
430FSe	S43023	0.12	1.25	1.00	16.0-18.0	—	0.06	0.06	0.15 min Se
434	S43400	0.12	1.00	1.00	16.0-18.0	—	0.04	0.03	0.75-1.25 Mo
436	S43600	0.12	1.00	1.00	16.0-18.0	—	0.04	0.03	0.75-1.25 Mo; 5 × %C min – 0.70 max Nb
439	S43035	0.07	1.00	1.00	17.0-19.0	0.50	0.04	0.03	0.15 Al; 12 × %C min – 1.10 Ti
442	S44200	0.20	1.00	1.00	18.0-23.0	—	0.04	0.03	—
444	S44400	0.025	1.00	1.00	17.5-19.5	1.00	0.04	0.03	1.75-2.50 Mo; 0.025 N; 0.2 + 4 (%C + %N) min – 0.8 max (Ti + Nb)
446	S44600	0.20	1.50	1.00	23.0-27.0	—	0.04	0.03	0.25 N
Duplex (ferritic-austenitic) type
329	S32900	0.20	1.00	0.75	23.0-28.0	2.50-5.00	0.040	0.030	1.00-2.00 Mo
Martensitic types
403	S40300	0.15	1.00	0.50	11.5-13.0	—	0.04	0.03	—
410	S41000	0.15	1.00	1.00	11.5-13.5	—	0.04	0.03	—
414	S41400	0.15	1.00	1.00	11.5-13.5	1.25-2.50	0.04	0.03	—
416	S41600	0.15	1.25	1.00	12.0-14.0	—	0.06	0.15 min	0.6 Mo (b)
416Se	S41623	0.15	1.25	1.00	12.0-14.0	—	0.06	0.06	0.15 min Se
420	S42000	0.15 min	1.00	1.00	12.0-14.0	—	0.04	0.03	—
420F	S42020	0.15 min	1.25	1.00	12.0-14.0	—	0.06	0.15 min	0.6 Mo (b)
422	S42200	0.20-0.25	1.00	0.75	11.5-13.5	0.5-1.0	0.04	0.03	0.75-1.25 Mo; 0.75-1.25 W; 0.15-0.3 V
431	S43100	0.20	1.00	1.00	15.0-17.0	1.25-2.50	0.04	0.03	—
440A	S44002	0.60-0.75	1.00	1.00	16.0-18.0	—	0.04	0.03	0.75 Mo
440B	S44003	0.75-0.95	1.00	1.00	16.0-18.0	—	0.04	0.03	0.75 Mo
440C	S44004	0.95-1.20	1.00	1.00	16.0-18.0	—	0.04	0.03	0.75 Mo
Precipitation-hardening types
PH 13-8 Mo	S13800	0.05	0.20	0.10	12.25-13.25	7.5-8.5	0.01	0.008	2.0-2.5 Mo; 0.90-1.35 Al; 0.01 N
15-5 PH	S15500	0.07	1.00	1.00	14.0-15.5	3.5-5.5	0.04	0.03	2.5-4.5 Cu; 0.15-0.45 Nb
17-4 PH	S17400	0.07	1.00	1.00	15.5-17.5	3.0-5.0	0.04	0.03	3.0-5.0 Cu; 0.15-0.45 Nb
17-7 PH	S17700	0.09	1.00	1.00	16.0-18.0	6.5-7.75	0.04	0.04	0.75-1.5 Al

^(a) Single values are maximum values unless otherwise indicated (a value followed by “min” is a minimum).
^(b) Optional.

Table notes

The “Other” column gives additional specified elements — nitrogen, copper, titanium, niobium, aluminum, molybdenum, selenium and tungsten — as printed in the source.

Type 420 carbon is a minimum (0.15% min); actual carbon varies by heat, so check the mill certificate where hardness matters. UNS S30430 appears in this table under its AISI designation 302Cu; some references list the same composition as 304Cu.

Composition limits are heat analysis values from the source. Product analysis tolerances may apply — confirm the governing specification with your supplier before ordering.

Related reference pages

Stainless steels overview · 420 stainless steel · 420 stainless steel heat treatment · 440C stainless steel · 440C stainless steel properties · 440C stainless steel heat treatment · 4Cr13 stainless steel · 9Cr18Mo stainless steel · Tool steel composition chart · 95Cr18 (9Cr18) stainless steel · Stainless steel physical properties chart

Source: ASM Handbook, Volume 1 — Properties and Selection: Irons, Steels, and High-Performance Alloys, Table 2 “Compositions of standard stainless steels” (10th ed.). Reference data for comparison — verify the applicable standard before ordering.