F22

UNS K21590: ASTM A182 (VO1.01)

General scope

Grade F22 is a low alloy steel containing nominally 2.25% Chromium. The alloy is widely used in the oil patch wellhead applications for connectors, hangers and block valves. Hardness levels up to 22 HRC are approved to NACE MR0175. The grade is often used as the base metal for clad components.

If supplied to ASTM A182 in the normalised and tempered condition, the 0.2% Proof Stress minimum is 30 KSI.

Chemical composition

C Si Mn P S Cr Mo Fe
Min 0.05 0.30 2.00 0.87 0.00
Max 0.15 0.50 0.60 0.040 0.040 2.50 1.13 0.00

Mechanical properties

Condition: Normalised, Hardened and Tempered to 75 KSI

U.T.S 95 KSI Min (655 N/mm2)
0.2% Proof Stress 75 KSI Min (517 N/mm2)
Elongation 18 %
Red of Area 35 %

Condition: Normalised, Hardened and Tempered to 105 KSI

NACE MR0175 limits the supply hardness to 22HRC max.
U.T.S 125 KSI Min (862 N/mm2)
0.2% Proof Stress 105 KSI Min (724 N/mm2)
Elongation 15 %
Red of Area 30 %
Size range: 2”∅ - 36”∅

Primarily manufactured in:

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