420 stainless steel
  Name: martensitic stainless steel
  Standard: AISI, ASTM
  Model: 420
  UNS Number: S42000
  ● 420 properties and applications:
  420 "cutting class" martensitic steel, high chrome steel, this Brinell similar to the 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, instruments, meters, transportation vehicles, and household appliances. Used for manufacture of anti-air, steam, water, corrosion and oxidation of acid components.
  ● 420 chemical composition of ①:
  Carbon 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
  Sulfur S: ≤ 0.03
  Note: ① single value unless otherwise stated herein, are the highest value; ② pipe technology for some time, some types of austenitic stainless steel containing nickel must be slightly higher than the values ​​shown in the table; ③ free; ④ the highest amount of Ta containing 0.10%; ⑤ the highest content of 0.75%; ⑥ the highest content of 0.70%