431 Stainless Steel 431 Stainless Steel Name: martensitic stainless steel Standard: AISI, ASTM Type: 431 UNS Number: S43100 ● 431 features and applications: 431 (16Cr-2Ni) with Ni-Cr steel, high mechanical properties obtained by heat treatment, corrosion-resistant performance is better than 410 steel and 430 steel. 431 stainless steel corresponding to the Chinese 1Cr17Ni2, Japan JIS SUS431. ● 431 chemical composition ①: Carbon C: ≤ 0.20 Manganese Mn: ≤ 1.00 Si Si: ≤ 1.00 Chromium Cr: 15.0 ~ 17.0 Ni-Ni ②: 1.25 ~ 2.50 Phosphorus P: ≤ 0.04 S S: ≤ 0.03 Note: ① single value addition otherwise indicated, are the highest value; ② process for certain pipe, some models of the nickel content of austenitic stainless steel to be slightly higher than the values ??shown in the table; ③ free; ④ containing the highest amount of Ta of 0.10%; ⑤ highest content of 0.75%; ⑥ highest content of 0.70%