Alloy 825

UNS N08825 : ASTM B425 & B564 (VO2.04)
Trade Name Incoloy 825 (1)

General scope

Alloy 825 is a Ni-Cr-Fe-Mo-Cu alloy with excellent resistance to stress corrosion cracking, and good pitting resistance in all environments except strongly oxidizing chloride solutions. The alloy is ductile and easily worked and fabricated, but work hardens in a similar manner to austenitic stainless steels.

The alloy cannot be hardened by heat-treatment, but enhanced mechanical properties can be obtained by cold working, especially in sour well tubing strings, and for heat-exchangers, and in chemical processing plants.

Chemical composition

C Si Mn P S Cr Ni Mo Cu Ti Al Fe
Min 19.50 38.00 2.50 1.50 0.60 22.00
Max 0.05 0.50 1.00 0.030 23.50 46.00 3.50 3.00 1.20 0.20 0.00

Mechanical properties

Condition: Annealed

NACE MR0175 limits the supply hardness to 35 HRC max.
U.T.S 85 KSI Min (586 N/mm2)
0.2% Proof Stress 35 KSI Min (241 N/mm2)
Elongation 30 %
Size range: 1”∅ - 12”∅

Primarily manufactured in:

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