Mechanical Tubing & OCTG

9 Cr / 1 MO Tube (T9)

UNS S50400 : ASTM A213 (VO1.01)

General scope

A martensitic steel containing 9% Chromium and 1% Molybdenum is most commonly used in the hardened and tempered condition.

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, and structural and pressure containing members and is listed in NACE MR0175 Table 6 as an acceptable material for sub-surface components.

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

When bill of material requirements can be matched against the wide stock sizes available considerable cost savings in both raw material supply and manufacturing are achievable against the comparable bar product.

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 supply hardness to 22 HRC 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: ”∅ OD up to 2”∅ OD with wall thickness 0.2”∅ to ”∅

Primarily manufactured in:

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