CHEMICLA COMPOSITIONS FOR COMMON STAINLESS STEELS

The chemical compositions for some commonly used austenitic, ferritic, martensitic, precipitation hardening 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 Martensitic Stainless Steel Chemical Compositions (Weight Percent)

Martensitic Stainless Steels

Common Name

UNS No.

C

Cr

Ni

Mo

N

Mn

Cu

Other

410

S41000

0.08-0.15

11.5-13.5

0.75

-

-

1.00

-

-

420

S42000

0.15 min.

12.0-14.0

0.75

0.50

-

1.00

-

-

440A

S44002

0.60-0.75

16.0-18.0

-

0.75

-

1.00

-

-

440C

S44004

0.95-1.20

16.0-18.0

-

0.75

-

1.00

-

-

Table 4: Common Precipitation Hardening Stainless Steel Chemical Compositions (Weight Percent)

Precipitation Hardening Stainless Steels

Common Name

UNS No.

C

Cr

Ni

Mo

N

Mn

Cu

Other

XM-13

S13800

0.05

12.3-13.2

7.5-8.5

2.00-2.50

0.01

0.20

-

Al 0.90-1.35

XM-12

S15500

0.07

14.0-15.5

3.5-5.5

-

-

1.00

2.5-4.5

Cb+Ta 0.15-0.45

632

S15700

0.09

14.0-16.0

6.5-7.7

2.00-3.00

-

1.00

-

Al 0.75-1.50

630

S17400

0.07

15.0-17.5

3.0-5.0

-

-

1.00

3.0-5.0

Cb+Ta 0.15-0.45

631

S17700

0.09

16.0-18.0

6.5-7.7

-

-

1.00

-

Al 0.75-1.50

Table 5: 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