AISI 4130

Low alloy 4130:ASTM A29 (VO1.05)

General scope

AISI 4130 low alloy steel containing nominally 0.3% Carbon, 1% Chromium and 0.2% Molybdenum is widely used in oil patch applications. It is similar to 4140 which has a higher carbon level giving 4130 improved weldability, at the expense of through thickness strength.

The hardenability limitations of this grade (depth to which it will harden / obtain the specified mechanical properties after heat treatment) must always be taken into account when designing and selecting equipment.

Chemical composition

Various hybrid analyses are available to improve the hardenability of the grade.
C Si Mn P S Cr Mo Fe
Min 0.28 0.15 0.40 0.80 0.15 0.00
Max 0.33 0.35 0.60 0.035 0.040 1.10 0.25 0.00

Mechanical properties

Condition: Hardened and Tempered to 22 HRC max.

NACE MR0175 limits the supply hardness to 22HRC max.
U.T.S 85 KSI Min (586 N/mm2)
0.2% Proof Stress 60 KSI Min (414 N/mm2)
Elongation 20 %
Red of Area 40 %
Size range: 3”∅ - 51”∅

Primarily manufactured in:

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