420 Stainless Steel 420 Stainless Steel Name: martensitic stainless steel Standard: AISI, ASTM Type: 420 UNS Number: S42000 ● 420 features and applications: 420 "cutting class" martensitic steel, high chrome steel similar to that Brandt's first stainless steel. 420 has some wear and corrosion resistance, hardness, its price is lower stainless steel ball in a class for general requirements for stainless steel work environment. 420 stainless steel for all kinds of precision machinery, bearings, electrical, equipment, apparatus, instruments, means of transport, and household appliances. Used for manufacture of anti-air, steam, water and oxidizing acid corrosion of parts. ● 420 chemical composition ①: C C: 0.30 ~ 0.40 Manganese Mn: ≤ 1.00 Si Si: ≤ 1.00 Chromium Cr: 12.0 ~ 14.0 Ni-Ni ②: ≤ 0.75 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%