Alloy 625

UNS N06625 : ASTM B446 (VO2.04) & B564 (VO2.04)
Trade Name Inconel 625 (1)

General scope

Alloy 625 is a Nickel - Chromium alloy with additions of Niobium (Columbium) and Molybdenum.

It has good stress-rupture strength up to 980°C (1800°F) resists oxidation and exhibits good resistance against chloride-ion stress corrosion cracking and crevice corrosion. Excellent fatigue strength and cryogenic properties.

It has widely used applications in marine and chemical processing environments, in forms such as seals, fasteners, heat exchangers, valves, steam lines, exhaust ducts, etc. It is also used as a weld overlay for corrosion resistance purposes.

Chemical composition

C Si Mn P S Cr Ni Mo NbCbTa Ti Al Fe
Min 20.00 58.00 8.00 3.15 0.00
Max 0.10 0.50 0.50 0.015 0.015 23.00 10.00 4.15 0.40 0.40 5.00

Mechanical properties

Condition: Annealed

NACE MR0175 limits the supply hardness to 35 HRC max.
U.T.S 120 KSI Min (827 N/mm2)
0.2% Proof Stress 60 KSI Min (414 N/mm2)
Elongation 20 %
Red of Area 35 %
CVN Impacts @ -40°C (-40°F) 27 Joules (20 ft-lbf)
Size range: 1”∅ - 12”∅

Primarily manufactured in:

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