The chemical compositions for some commonly used austenitic, ferritic, and duplex stainless steels are provided in the following tables. When specifying stainless steel chemistry, it is important to reference the appropriate ASTM standard and the UNS (Unified Numbering System) number associated with the specific alloy or grade. UNS numbers are internationally recognized specific chemistry requirements. If common names such as AISI numbers are referenced, the UNS number should also be used to avoid confusion.
These compositions exclude phosphorus (P), sulfur (S), and silicon (Si). Chemical composition requirements may vary with the specific product requirements so please refer to the appropriate specification.
Table 1: Austenitic Stainless Steel Chemical Compositions (Weight Percent)
Austenitic Stainless Steels
Common Name
UNS No.
C
Cr
Ni
Mo
N
Mn
Cu
Other
201
S20100
0.15
16.0-18.0
3.5-5.5
–
0.25
5.50-7.50
–
–
301
S30100
0.15
16.0-18.0
6.0-8.0
–
0.10
2.00
–
–
304L
S30403
0.030
17.5-19.5
8.0-12.0
–
0.10
2.00
–
–
305
S30500
0.12
17.0-19.0
10.5-13.0
–
–
2.00
–
–
321
S32100
0.08
17.0-19.0
9.0-12.0
–
0.10
2.00
–
Ti 5x(C+N)
347
S34700
0.08
17.0-19.0
9.0-13.0
–
–
2.00
–
Cb 10xC to 1.00
309S
S30908
0.08
22.0-24.0
12.0-15.0
–
–
2.00
–
–
310S
S31008
0.08
24.0-26.0
19.0-22.0
–
–
2.00
–
–
316L
S31603
0.030
16.0-18.0
10.0-14.0
2.00-3.00
0.10
2.00
–
–
317L
S31703
0.030
18.0-20.0
11.0-15.0
3.0-4.0
0.10
2.00
–
–
317LMN
S31726
0.030
17.0-20.0
13.5-17.5
4.0-5.0
0.10-0.20
2.00
–
–
904L
N08904
0.020
19.0-23.0
23.0-28.0
4.00-5.00
0.10
2.00
1.00-2.00
–
Table 2: Common Ferritic Stainless Steel Chemical Compositions (Weight Percent)
Ferritic Stainless Steels
Common Name
UNS No.
C
Cr
Ni
Mo
N
Mn
Cu
Other
409
S40910
0.030
10.5-11.7
0.50
–
0.030
1.00
–
Ti 6x(C+N) to .50 Cb 0.17
S40920
0.030
10.5-11.7
0.50
–
0.030
1.00
–
Ti 8x(C+N) min. Ti 0.15-0.50 Cb 0.10
S40930
0.030
10.5-11.7
0.50
–
0.030
1.00
–
(Ti+Cb) [0.08+8x(C+N)] to 0.75 Ti 0.05 min.
405
S40500
0.08
11.5-14.5
0.60
–
–
1.00
–
Al 0.10-0.30
430
S43000
0.12
16.0-18.0
0.75
–
–
1.00
–
–
434
S43400
0.12
16.0-18.0
–
0.75-1.25
–
1.00
–
–
436
S43600
0.12
16.0-18.0
–
0.75-1.25
–
1.00
–
Cb 5xC to 0.80
439
S43035
0.030
17.0-19.0
0.50
–
0.030
1.00
–
Ti [0.20+4(C+N)] to 1.10 Al .15 max.
444
S44400
0.025
17.5-19.5
1.00
1.75-2.50
0.035
1.00
–
(Ti+Cb) [0.20+4(C+N)] to 0.80 max.
26-3-3
S44660
0.030
25.0-28.0
1.0-3.5
3.0-4.0
0.040
1.00
–
(Ti+Cb) 0.20 to 1.00 and (Ti+Cb) 6x(C+N) min.
Table 3: Common Duplex Stainless Steel Chemical Compositions (Weight Percent)Duplex Stainless Steels
Common Name
UNS No.
C
Cr
Ni
Mo
N
Mn
Cu
Other
S31200
0.030
24.0-26.0
5.5-6.5
1.20-2.00
0.14-0.20
2.00
–
–
S31260
0.030
24.0-26.0
5.5-7.5
2.5-3.5
0.10-0.30
1.00
0.20-0.80
W 0.10-0.50
S32001
0.030
19.5-21.5
1.00-3.00
0.60
0.05-0.17
4.0-6.0
1.00
–
S32003
0.030
19.5-22.5
3.0-4.0
1.50-2.00
0.14-0.20
2.00
–
–
S32101
0.040
21.0-22.0
1.35-1.70
0.10-0.80
0.20-0.25
4.0-6.0
0.10-0.80
–
S32202
0.030
21.5-24.0
1.00-2.80
0.45
0.18-0.26
2.00
–
–
2304
S32304
0.030
21.5-24.5
3.0-5.5
0.05-0.60
0.05-0.20
2.50
0.05-0.60
–
2205
S31803
0.030
21.0-23.0
4.5-6.5
2.5-3.5
0.08-0.20
2.00
–
–
2205
S32205
0.030
22.0-23.0
4.5-6.5
3.0-3.5
0.14-0.20
2.00
–
–
S32506
0.030
24.0-26.0
5.5-7.2
3.0-3.5
0.08-0.20
1.00
–
W 0.05-0.30
S32520
0.030
24.0-26.0
5.5-8.0
3.0-4.0
0.20-0.35
1.50
0.50-2.00
–
255
S32550
0.04
24.0-27.0
4.5-6.5
2.9-3.9
0.10-0.25
1.50
1.50-2.50
–
2507
S32750
0.030
24.0-26.0
6.0-8.0
3.0-5.0
0.24-0.32
1.20
0.50
–
S32760
0.030
24.0-26.0
6.0-8.0
3.0-4.0
0.20-0.30
1.00
0.50-1.00
W 0.50-1.00
S32808
0.030
27.0-27.9
7.0-8.2
0.8-1.2
0.30-0.40
1.10
–
W 2.10-2.50
S32906
0.030
28.0-30.0
5.8-7.5
1.50-2.60
0.30-0.40
0.80-1.5
0.80
–
S32950
0.030
26.0-29.0
3.50-5.20
1.00-2.50
0.15-0.35
2.00
–
–
S39274
0.030
24.0-26.0
6.8-8.0
2.5-3.5
0.24-0.32
1.0
0.20-0.80
W 1.50-2.50
S82011
0.030
20.5-23.5
1.0-2.0
0.10-1.00
0.15-0.27
2.0-3.0
0.50
–
Notes for All Tables: Date was extracted from ASTM specifications for plate, sheet, and strip when available or from company data sheets. Chemistries are the maximum percentage, unless range or minimum is indicated.
Austenitic, Ferritic, and Duplex – ASTM A240, Martensitic – ASTM A176, ASTM A240, or ASTM A959 Precipitation Hardening Grades – ASTM A693.
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