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420 mod grade steel is used extensively on completion equipment in both bar and tubular form, for structural and pressure containing members in standard and CO2 environments.
It is capable of deep hardening (to approximately 500HB) but usually limited to 22HRc in order to comply with NACE MR0175/ISO15156.
420 steel is very sensitive to oxygen and chlorine contamination. It has relatively low corrosion resistance when compared with other stainless steels and it is not recommended for temperatures above 100°C and chloride environments above 50 000ppm.
This grade has better hot working characteristics and is less susceptible to quench cracking when compared to 410.
420 mod steel is still often referred to as EN56C steel - its equivalent grade under the previous BS 970: 1955 standard.
Rolled or Forged
Black Bar or Bright Bar