The elemental chemical composition of stainless steel is mainly composed of Ferrum (Fe) and Chromium (Cr), other alloy elements in the chemical composition also include Carbon (C), Silicon (Si), Manganese (Mn), Phosphorus (P), Sulfur (S), Nickel (Ni), Molybdenum (Mo), Titanium (Ti), Nitrogen (N), and Cuprum (Cu), etc. Only when the Cr percentage composition reaches a certain value, the steel has corrosion resistance. Therefore, stainless steel metal generally has a Chromium content of minimum 10.5%.
The following table lists the chemical composition of stainless steel alloys, including austenitic SS 304, 304L 316, 316L, 321, 303, 302, 301, 904L, 201, etc., martensitic SS 440A, 440B, 440C, 420 etc., ferritic SS 430, duplex stainless steel 2205, 2507, 329, etc.
Note: Maximum “≤“, unless range (Min-Max) or minimum (≥) is indicated.
| Stainless Steel Chemical Composition Chart, Percentage (%) | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Stainless Steel | C, ≤ | Mn, ≤ | P, ≤ | S, ≤ | Si, ≤ | Cr | Ni | Mo | N, ≤ | Other Elements, ≤ |
| 304 | 0.08 | 2.00 | 0.045 | 0.03 | 1.00 | 18.0-20.0 | 8.0-11.0 | – | – | – |
| 304L | 0.03 | 2.00 | 0.045 | 0.03 | 1.00 | 18.0-20.0 | 8.0-12.0 | – | – | – |
| 316 | 0.08 | 2.00 | 0.045 | 0.030 | 1.00 | 16.0-18.0 | 10.0-14.0 | 2.00-3.00 | – | – |
| 316L | 0.03 | 2.00 | 0.045 | 0.030 | 1.00 | 16.0-18.0 | 10.0-14.0 | 2.00-3.00 | – | – |
| 321 | 0.08 | 2.00 | 0.045 | 0.03 | 1.00 | 17.0-19.0 | 9.0-12.0 | – | 0.10 | ≥ Ti 5×(C+N), ≤ 0.70 |
| 201 | 0.15 | 5.50-7.50 | 0.06 | 0.03 | 1.00 | 16.0-18.0 | 3.5-5.5 | – | 0.25 | – |
| 202 | 0.15 | 7.50-10.00 | 0.06 | 0.03 | 1.00 | 17.0-19.0 | 4.0-6.0 | – | 0.25 | – |
| 205 | 0.12-0.25 | 14.0-15.5 | 0.06 | 0.03 | 1.00 | 16.5-18.0 | 1.0-1.7 | – | 0.32-0.40 | – |
| 301 | 0.15 | 2.00 | 0.045 | 0.03 | 1.00 | 16.0-18.0 | 6.0-8.0 | – | 0.10 | – |
| 301L | 0.03 | 2.00 | 0.045 | 0.03 | 1.00 | 16.0-18.0 | 6.0-8.0 | – | 0.20 | – |
| 301LN | 0.03 | 2.00 | 0.045 | 0.03 | 1.00 | 16.0-18.0 | 6.0-8.0 | – | 0.07-0.20 | – |
| 302 | 0.15 | 2.00 | 0.045 | 0.03 | 0.75 | 17.0-19.0 | 8.0-10.0 | – | 0.10 | – |
| 302B | 0.15 | 2.00 | 0.045 | 0.03 | 2.00-3.00 | 17.0-19.0 | 8.0-10.0 | – | 0.10 | – |
| 303 | 0.15 | 2.00 | 0.2 | ≥0.15 | 1.00 | 17.0-19.0 | 8.0-10.0 | – | – | – |
| 303Se | 0.15 | 2.00 | 0.2 | 0.06 | 1.00 | 17.0-19.0 | 8.0-10.0 | – | – | Se 0.15 |
| 304H | 0.04-0.10 | 2.00 | 0.045 | 0.03 | 0.75 | 18.0-20.0 | 8.0-10.5 | – | – | – |
| 304N | 0.08 | 2.00 | 0.045 | 0.03 | 1.00 | 18.0-20.0 | 8.0-11.0 | – | 0.10-0.16 | – |
| 304LN | 0.03 | 2.00 | 0.045 | 0.03 | 1.00 | 18.0-20.0 | 8.0-11.0 | – | 0.10-0.16 | – |
| 305 | 0.12 | 2.00 | 0.045 | 0.03 | 1.00 | 17.0-19.0 | 11.0-13.0 | – | – | – |
| 308 | 0.08 | 2.00 | 0.045 | 0.03 | 1.00 | 19.0-21.0 | 10.0-12.0 | – | – | – |
| 309 | 0.2 | 2.00 | 0.045 | 0.03 | 1.00 | 22.0-24.0 | 12.0-15.0 | – | – | – |
| 309S | 0.08 | 2.00 | 0.045 | 0.03 | 1.00 | 22.0-24.0 | 12.0-15.0 | – | – | – |
| 309H | 0.04-0.10 | 2.00 | 0.045 | 0.03 | 0.75 | 22.0-24.0 | 12.0-15.0 | – | – | – |
| 309Cb | 0.08 | 2.00 | 0.045 | 0.03 | 1.00 | 22.0-24.0 | 12.0-16.0 | – | – | ≥ Cb 10 x C, ≤1.10 |
| 309HCb | 0.04-0.10 | 2.00 | 0.045 | 0.03 | 0.75 | 22.0-24.0 | 12.0-16.0 | – | – | ≥ Cb 10 x C, ≤1.10 |
| 310 | 0.25 | 2.00 | 0.045 | 0.03 | 1.5 | 24.0-26.0 | 19.0-22.0 | – | – | – |
| 310S | 0.08 | 2.00 | 0.045 | 0.03 | 1.5 | 24.0-26.0 | 19.0-22.0 | – | – | – |
| 310H | 0.04-0.10 | 2.00 | 0.045 | 0.03 | 0.75 | 24.0-26.0 | 19.0-22.0 | – | – | – |
| 310Cb | 0.08 | 2.00 | 0.045 | 0.03 | 1.5 | 24.0-26.0 | 19.0-22.0 | – | – | ≥ Cb 10 x C, ≤ 1.10 |
| 310 MoLN | 0.02 | 2.00 | 0.03 | 0.01 | 0.5 | 24.0-26.0 | 20.5-23.5 | 1.60-2.60 | 0.09-0.15 | – |
| 314 | 0.25 | 2.00 | 0.045 | 0.03 | 1.50-3.00 | 23.0-26.0 | 19.0-22.0 | – | – | – |
| 316H | 0.04-0.10 | 2.00 | 0.045 | 0.03 | 0.75 | 16.0-18.0 | 10.0-14.0 | 2.00-3.00 | – | – |
| 316Ti | 0.08 | 2.00 | 0.045 | 0.03 | 1.00 | 16.0-18.0 | 10.0-14.0 | 2.00-3.00 | 0.1 | ≥ Ti 5 × (C + N), ≤0.70 |
| 316Cb | 0.08 | 2.00 | 0.045 | 0.03 | 1.00 | 16.0-18.0 | 10.0-14.0 | 2.00-3.00 | 0.1 | ≥ Cb 10 × C, ≤ 1.10 |
| 316N | 0.08 | 2.00 | 0.045 | 0.03 | 1.00 | 16.0-18.0 | 10.0-14.0 | 2.00-3.00 | 0.10-0.16 | – |
| 316LN | 0.03 | 2.00 | 0.045 | 0.03 | 1.00 | 16.0-18.0 | 10.0-13.0 | 2.00-3.00 | 0.10-0.16 | – |
| 317 | 0.08 | 2.00 | 0.045 | 0.03 | 1.00 | 18.0-20.0 | 11.0-15.0 | 3.0-4.0 | 0.1 | – |
| 317L | 0.03 | 2.00 | 0.045 | 0.03 | 0.75 | 18.0-20.0 | 11.0-15.0 | 3.0-4.0 | 0.1 | – |
| 317LM | 0.03 | 2.00 | 0.045 | 0.03 | 0.75 | 18.0-20.0 | 13.5-17.5 | 4.0-5.0 | 0.2 | – |
| 317LMN | 0.03 | 2.00 | 0.045 | 0.03 | 0.75 | 17.0-20.0 | 13.5-17.5 | 4.0-5.0 | 0.10-0.20 | – |
| 317LN | 0.03 | 2.00 | 0.045 | 0.03 | 0.75 | 18.0-20.0 | 11.0-15.0 | 3.0-4.0 | 0.10-0.22 | – |
| 321 | 0.08 | 2.00 | 0.045 | 0.03 | 1.00 | 17.0-19.0 | 9.0-12.0 | – | 0.1 | ≥ Ti 5 × (C + N), ≤ 0.70 |
| 321H | 0.04-0.10 | 2.00 | 0.045 | 0.03 | 0.75 | 17.0-19.0 | 9.0-12.0 | – | – | ≥ Ti 4 × (C + N), ≤ 0.70 |
| 334 | 0.08 | 1.00 | 0.03 | 0.015 | 1.00 | 18.0-20.0 | 19.0-21.0 | – | – | Al 0.15-0.60, Ti 0.15-0.60 |
| 347 | 0.08 | 2.00 | 0.045 | 0.03 | 1.00 | 17.0-19.0 | 9.0-12.0 | – | – | ≥ Cb 10 × C, ≤ 1.00 |
| 347H | 0.04-0.10 | 2.00 | 0.045 | 0.03 | 0.75 | 17.0-19.0 | 9.0-13.0 | – | – | ≥ Cb 8 × C, ≤ 1.00 |
| 347LN | 0.005-0.020 | 2.00 | 0.045 | 0.03 | 1.00 | 17.0-19.0 | 9.0-13.0 | – | 0.06-0.10 | Cb 0.20-0.50, 15 × C ≥ |
| 348 | 0.08 | 2.00 | 0.045 | 0.03 | 1.00 | 17.0-19.0 | 9.0-12.0 | – | – | Cb 10×C-1.10, Ta 0.10, Co 0.20 |
| 348H | 0.04-0.10 | 2.00 | 0.045 | 0.03 | 0.75 | 17.0-19.0 | 9.0-13.0 | – | – | (Cb + Ta) 8×C ≥ , 1.00 ≤, Ta 0.10, Co 0.20 |
| 2205 | 0.03 | 2.00 | 0.03 | 0.02 | 1.00 | 22.0-23.0 | 4.5-6.5 | 3.0-3.5 | 0.14-0.20 | – |
| 2304 | 0.03 | 2.5 | 0.04 | 0.03 | 1.00 | 21.5-24.5 | 3.0-5.5 | 0.05-0.60 | 0.05-0.60 | – |
| 255 | 0.04 | 1.5 | 0.04 | 0.03 | 1.00 | 24.0-27.0 | 4.5-6.5 | 2.9-3.9 | 0.10-0.25 | Cu 1.50-2.50 |
| 2507 | 0.03 | 1.2 | 0.035 | 0.02 | 0.8 | 24.0-26.0 | 6.0-8.0 | 3.0-5.0 | 0.24-0.32 | Cu ≤0.50 |
| 329 | 0.08 | 1.00 | 0.04 | 0.03 | 0.75 | 23.0-28.0 | 2.0-5.00 | 1.00-2.00 | – | – |
| 403 | 0.15 | 1.00 | 0.04 | 0.03 | 0.5 | 11.5-13.0 | – | – | – | – |
| 405 | 0.08 | 1.00 | 0.04 | 0.03 | 1.00 | 11.5-14.5 | ≤0.5 | – | – | Al 0.10-0.30 |
| 410 | 0.08-0.15 | 1.00 | 0.04 | 0.03 | 1.00 | 11.5-13.5 | – | – | – | – |
| 410S | 0.08 | 1.00 | 0.04 | 0.03 | 1.00 | 11.5-13.5 | ≤0.6 | – | – | – |
| 414 | 0.15 | 1.00 | 0.04 | 0.03 | 1.00 | 11.5-13.5 | 1.25-2.50 | – | – | – |
| 416 | 0.15 | 1.25 | 0.06 | ≥0.15 | 1.00 | 12.0-14.0 | – | – | – | – |
| 416Se | 0.15 | 1.25 | 0.06 | ≥0.06 | 1.00 | 12.0-14.0 | – | – | – | Se 0.15 |
| 420 | 0.15, ≥ | 1.00 | 0.04 | 0.03 | 1.00 | 12.0-14.0 | – | – | – | – |
| 420F | 0.30-0.40 | 1.25 | 0.06 | ≥0.15 | 1.00 | 12.0-14.0 | ≤0.5 | – | – | Cu 0.60 |
| 420FSe | 0.20-0.40 | 1.25 | 0.06 | 0.15 | 1.00 | 12.0-14.0 | ≤0.5 | – | – | Se 0.15; Cu 0.60 |
| 422 | 0.20-0.25 | 0.50-1.00 | 0.025 | 0.025 | 0.5 | 11.0-12.5 | 0.50-1.00 | 0.90-1.25 | – | V (0.20-0.30), W (0.90-1.25) |
| 429 | 0.12 | 1.00 | 0.04 | 0.03 | 1.00 | 14.0-16.0 | – | – | – | – |
| 430 | 0.12 | 1.00 | 0.04 | 0.03 | 1.00 | 16.0-18.0 | – | – | – | – |
| 430F | 0.12 | 1.25 | 0.06 | ≥0.15 | 1.00 | 16.0-18.0 | – | – | – | – |
| 430FSe | 0.12 | 1.25 | 0.06 | 0.06 | 1.00 | 16.0-18.0 | – | – | – | Se 0.15 |
| 439 | 0.03 | 1.00 | 0.04 | 0.03 | 1.00 | 17.0-19.0 | ≤0.5 | – | 0.03 | ≥ Ti [0.20+4(C+N)], ≤ 1.10; Al 0.15 |
| 431 | 0.2 | 1.00 | 0.04 | 0.03 | 1.00 | 15.0-17.0 | 1.25-2.50 | – | – | – |
| 434 | 0.12 | 1.00 | 0.04 | 0.03 | 1.00 | 16.0-18.0 | – | 0.75-1.25 | – | |
| 436 | 0.12 | 1.00 | 0.04 | 0.03 | 1.00 | 16.0-18.0 | – | 0.75-1.25 | – | ≥ Cb 5×C, ≤ 0.80 |
| 440A | 0.60-0.75 | 1.00 | 0.04 | 0.03 | 1.00 | 16.0-18.0 | – | ≤0.75 | – | – |
| 440B | 0.75-0.95 | 1.00 | 0.04 | 0.03 | 1.00 | 16.0-18.0 | – | ≤0.75 | – | – |
| 440C | 0.95-1.20 | 1.00 | 0.04 | 0.03 | 1.00 | 16.0-18.0 | – | ≤0.75 | – | – |
| 440F | 0.95-1.20 | 1.25 | 0.06 | 0.15 | 1.00 | 16.0-18.0 | ≤0.5 | – | – | Cu ≤0.60 |
| 440FSe | 0.95-1.20 | 1.25 | 0.06 | 0.06 | 1.00 | 16.0-18.0 | ≤0.5 | – | – | Se ≤0.15; Cu ≤0.60 |
| 442 | 0.2 | 1.00 | 0.04 | 0.04 | 1.00 | 18.0-23.0 | ≤0.6 | – | – | |
| 444 | 0.025 | 1.00 | 0.04 | 0.03 | 1.00 | 17.5-19.5 | ≤1.00 | 1.75-2.50 | 0.035 | Ti+Cb 0.20+4 × (C+N)-0.80 |
| 446 | 0.2 | 1.5 | 0.04 | 0.03 | 1.00 | 23.0-27.0 | ≤0.75 | – | 0.25 | – |
| 800 | 0.1 | 1.5 | 0.045 | 0.015 | 1.00 | 19.0-23.0 | 30.0-35.0 | – | – | Cu 0.75; ≥ FeH 39.5; Al 0.15-0.60 |
| 800H | 0.05-0.10 | 1.5 | 0.045 | 0.015 | 1.00 | 19.0-23.0 | 30.0-35.0 | – | – | Cu 0.75; ≥ FeH 39.5; Al 0.15-0.60 |
| 904L | 0.02 | 2.00 | 0.045 | 0.035 | 1.00 | 19.0-23.0 | 23.0-28.0 | 4.00-5.00 | 0.1 | Cu 1.00-2.00 |
| Alloy 20 | 0.07 | 2.00 | 0.045 | 0.035 | 1.00 | 19.0-21.0 | 32.0-38.0 | 2.00-3.00 | – | Cu 3.0-4.0; ≥ Nb 8 × C; ≤1.00 |
| XM-1 | 0.08 | 5.0-6.5 | 0.04 | 0.18-0.35 | 1.00 | 16.00-18.0 | 5.0-6.5 | – | – | Cu 1.75-2.25 |
| XM-2 | 0.15 | 2.00 | 0.05 | 0.11-0.16 | 1.00 | 17.0-19.0 | 8.0-10.0 | 0.40-0.60 | – | Al 0.60-1.00 |
| XM-5 | 0.15 | 2.5-4.5 | 0.2 | ≥0.25 | 1.00 | 17.0-19.0 | 7.0-10.0 | – | – | – |
| XM-6 | 0.15 | 1.50-2.50 | 0.06 | ≥0.15 | 1.00 | 12.0-14.0 | – | – | – | – |
| XM-10 | 0.08 | 8.0-10.0 | 0.045 | 0.03 | 1.00 | 19.0-21.5 | 5.5-7.5 | – | 0.15-0.40 | – |
| XM-11 | 0.04 | 8.0-10.0 | 0.045 | 0.03 | 1.00 | 19.0-21.5 | 5.5-7.5 | – | 0.15-0.40 | – |
| XM-15 | 0.08 | 2.00 | 0.03 | 0.03 | 1.50-2.50 | 17.0-19.0 | 17.5-18.5 | – | – | – |
| XM-17 | 0.08 | 7.50-9.00 | 0.045 | 0.03 | 0.75 | 17.5-22.0 | 5.0-7.0 | 2.00-3.00 | 0.25-0.50 | – |
| XM-18 | 0.03 | 7.50-9.00 | 0.045 | 0.03 | 0.75 | 17.5-22.0 | 5.0-7.0 | 2.00-3.00 | 0.25-0.50 | – |
| XM-19 | 0.06 | 4.0-6.0 | 0.045 | 0.03 | 1.00 | 20.5-23.5 | 11.5-13.5 | 1.50-3.00 | 0.20-0.40 | Cb 0.10-0.30, V 0.10-0.30 |
| XM-21 | 0.08 | 2.00 | 0.045 | 0.03 | 0.75 | 18.0-20.0 | 8.0-10.5 | – | 0.16-0.30 | – |
| XM-27 | 0.01 | 0.4 | 0.02 | 0.02 | 0.4 | 25.0-27.5 | ≤0.5 | 0.75-1.50 | 0.015 | Cu 0.20; Cb 0.05-0.20; (Ni + Cu) 0.50 |
| XM-33 | 0.06 | 0.75 | 0.04 | 0.02 | 0.75 | 25.0-27.0 | ≤0.5 | 0.75-1.50 | 0.04 | Cu 0.20; Ti 0.20-1.00; ≥ Ti 7(C+N) |
| XM-34 | 0.08 | 2.5 | 0.04 | ≥0.15 | 1.00 | 17.5-19.5 | – | 1.50-2.50 | – | – |
| PH 13-8Mo | 0.05 | 0.2 | 0.01 | 0.008 | 0.1 | 12.25-13.25 | 7.5-8.5 | – | – | – |
| 15-5 PH | 0.07 | 1 | 0.04 | 0.03 | 1 | 14.0-15.5 | 3.5-5.5 | – | – | 2.5-4.5 Cu; 0.15-0.45 Nb |
| 17-4 PH | 0.07 | 1 | 0.04 | 0.03 | 1 | 15.5-17.5 | 3.0-5.0 | – | – | 3.0-5.0 Cu; 0.15-0.45 Nb |
| 17-7 PH | 0.09 | 1 | 0.04 | 0.04 | 1 | 16.0-18.0 | 6.5-7.75 | – | – | 0.75-1.5 Al |
| Stainless Steel | C, ≤ | Mn, ≤ | P, ≤ | S, ≤ | Si, ≤ | Cr | Ni | Mo | N, ≤ | Other Elements, ≤ |