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Incoloy 825

Designated as UNS N08825 or DIN W.Nr. 2.4858, Incoloy 825 (also known as “Alloy 825”) is an iron-nickel-chromium alloy with additions of molybdenum, cooper and titanium. The molybdenum addition improves its resistance to pitting corrosion in aqueous corrosion application while copper content bestows resistance to sulfuric acid. Titanium is added for stabilization. The Alloy 825 has excellent resistance to both reducing and oxidizing acids, to stress-corrosion cracking, and to localized attack such as pitting and crevice corrosion. It is especially resistant to sulfuric and phosphoric acids. Incoloy 825 alloy is mainly used for chemical processing, petrochemical piping, pollution-control equipment, oil and gas well piping, nuclear fuel reprocessing, acid production, and pickling equipment.

ASTM B423 UNS N08825, Incoloy 825 seamless pipes.

ASTM B423 UNS N08825, Incoloy 825 seamless pipes.

1. Chemical Composition Requirements

The Chemical Composition of Incoloy 825, %
Nickel38.0-46.0
Iron≥22.0
Chromium19.5-23.5
Molybdenum2.5-3.5
Copper1.5-3.0
Titanium0.6-1.2
Carbon≤0.05
Manganese≤1.00
Sulfur≤0.030
Silicon≤0.50
Aluminum≤0.20

2. Mechanical Properties of Incoloy 825

ASTM B564 incoloy 825 weld neck flanges

Incoloy 825 weld neck flanges 600# SCH80, manufactured to ASTM B564.

Tensile Strength, min.Yield Strength, min.Elongation, min.Elastic Modulus
MpaksiMpaksi%Gpa106psi
690100310454520629.8

3. Physical Properties of Incoloy 825

DensityMelting RangeSpecific HeatElectrical Resistivity
g/cm3°C°FJ/kg.kBtu/lb. °FµΩ·m
8.141370-14002500-25504400.1051130

4. Product Forms and Standards of Incoloy 825

Product formStandard
Rods and barsASTM B425, DIN17752
Plates, sheet and stripsASTM B906, B424
Seamless pipes and tubesASTM B423, B829
Welded pipesASTM B705, B775
Welded tubesASTM B704, B751
Welded pipe fittingsASTM A366
ForgingASTM B564, DIN17754

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