Incoloy 825 (UNS N08825/ W.Nr. 2.4858)

Incoloy 825 (UNS N08825 / W.Nr. 2.4858) is a Ni-Fe-Cr-Mo Ti-stabilized alloy with excellent resistance to sulfuric and phosphoric acids. Resistant to reducing and oxidizing acids, pitting, stress-corrosion cracking and intergranular corrosion, it is used in chemical and petrochemical processing, oil and gas extraction, pollution control, waste processing and pickling applications.

Equivalent Grades

Incoloy 825GH1140
ЭИ602Incoloy 825N08825NiCr21Mo2.4858NA16NCF 825

Chemical Composition, %

Incoloy 825≤0.05≤0.50≤1.00≤0.03≤0.0319.5-23.538.0-46.02.5-3.5≤0.200.6-1.21.5-3.0≥22,0

Typical Physical and Mechanical Properties (RT, Solution annealed)

Density, g/cm3Melting Point, ℃Tensile Strength, MPaYield Strength, MPaELongation, %Hardness, HB

Available Products and Specifications

Rod, Bar, Wire and ForgingsASTM B425/ASME SB425, ASTM B564/ASME SB564, ISO 9723/9724/9725, DIN 17752/17753/17754
Plate, Sheet and StripASTM B424/B409/B906/ASME SB424/SB409/SB906, ISO 6208
Pipe and TubeASTM B163/ASME SB163, ASTM B407/B829/ASME SB407/SB829, ASTM B514/B775/ASME SB514/SB775, ASTM B515/B751/ASME SB515/SB751, ISO 6207
Welding Product
OthersASTM B366/ASME SB366(Fittings)


  • Good resistance to stress-corrosion cracking
  • Satisfactory resistance to pitting and crevice corrosion
  • Good resistance to oxidizing and non-oxidizing hot acids
  • Good mechanical properties at both room and elevated temperatures, up to approximately 550℃
  • Approval for pressure vessels with wall temperatures up to 450℃


  • Components such as heating coils, tanks, crates, baskets and chains in sulphuric acid pickling plants
  • Sea-water-cooled heat exchangers, offshore product piping systems; tubes and components in sour gas service
  • Heat exchangers, evaporators, scrubbers, dip pipes etc. in phosphoric acid production
  • Air-cooled heat exchangers in petroleum refineries
  • Food processing
  • Chemical plant