Grade 420 Modified

13 Cr - Stainless

General scope

This 13 Cr martensitic stainless steel is used in the hardened and tempered condition. It is used extensively on completion equipment in both bar and tubular form, for structural and pressure containing members, in standard and CO2 environments. pH, chlorides, temperature and H2S can limit its use in other environments. The grade is approved by NACE MR0175 supplied to 22 HRC for packers and other sub-surface equipment.

Grade 420 generally has better hot working characteristics than 410, and is less susceptible to cracking at heat treatment.

Chemical composition

C Si Mn P S Cr Mo Fe
Min 0.18 0.25 0.25 12.50 0.00
Max 0.22 1.00 1.00 0.020 0.005 14.00 0.00

Mechanical properties

Condition: Hardened and Double Tempered

NACE MR0175 limits the supply hardness to 22 HRC max.
U.T.S 100 KSI Min (689 N/mm2)
0.2% Proof Stress 80 KSI Min (551 N/mm2)
Elongation 20 %
Red of Area 40 %
CVN Impacts @ -10°C (14°F) 20 Joules (15 ft-lbf)
Size range: 2”∅ - 12”∅

Primarily manufactured in:

  • Dubai, UAE
  • Edmonton, Canada
  • Houston, Texas
  • Sheffield, England
  • Singapore