Low Alloy Steels

9 Cr/1 Mo

UNS S50400: ASTM A182 (VO1.01)

General scope

A martensitic steel containing 9% Chromium and 1% Molybdenum is most commonly used in the hardened and tempered condition. When produced as bar stock it is manufactured to the analysis requirements of ASTM A200 (V01.01).

Though often referred to as a stainless steel the grade does not meet the accepted criteria to be considered a stainless steel.

Used extensively as tubulars, structural and pressure containing members.

This alloy may be subject to accelerated local corrosion in environments containing free oxygen.

Chemical composition

C Si Mn P S Cr Mo Fe
Min 0.25 0.30 8.00 0.90 0.00
Max 0.15 1.00 0.60 0.025 0.025 10.00 1.10 0.00

Mechanical properties


NACE MR0175 limits the supply hardness to 22HRC max.
U.T.S 95 KSI Min (655 N/mm2)
0.2% Proof Stress 80 KSI Min (551 N/mm2)
Elongation 20 %
Red of Area 40 %
Size range: 2”∅ - 10”∅

Primarily manufactured in:

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