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 |
S40920 | 0.030 | 10.5-11.7 | 0.50 | – | 0.030 | 1.00 | – | Ti 8x(C+N) min. | |
S40930 | 0.030 | 10.5-11.7 | 0.50 | – | 0.030 | 1.00 | – | (Ti+Cb) [0.08+8x(C+N)] to 0.75 | |
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 |
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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