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Stainless Steel Chemical Composition Chart 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, ≤
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