Incoloy 825 (UNS N08825)

Nickel-Iron-Chromium Alloy With Molybdenum And Copper Additions, Offering Exceptional Resistance To Acids, Stress Corrosion Cracking, And Aggressive Industrial Environments.
Alloy 600 UNS N06600 2.4816 ASTM B167 / B166 / B168
Incoloy 825 tube

Introduction of Incoloy 825 Alloy

Incoloy 825 (UNS N08825, Alloy 825) is a nickel-iron-chromium alloy with added molybdenum and copper, designed for outstanding corrosion resistance in reducing, oxidizing, and high temperature environments.

It is widely used in chemical processing, oil & gas, pollution control, and heat exchanger applications requiring stress corrosion cracking resistance and superior performance in aggressive environments.

Chemical Composition (%)

Nickel (Ni)38–46
Iron (Fe)Balance
Chromium (Cr)19–23
Molybdenum (Mo)2–3
Copper (Cu)1–2
Carbon (C)≤0.05
Manganese (Mn)≤1
Silicon (Si)≤1
Sulfur (S)≤0.03
Cobalt (Co)≤1

Mechanical Properties

Tensile Strength≥585 MPa
Yield Strength≥205 MPa
Elongation≥30%
Hardness≤180 HB
ConditionAnnealed

Physical Properties

Density8.0 g/cm³
Melting Range1350–1400°C
Thermal Conductivity11 W/m·K
Electrical Resistivity0.9 μΩ·m
Elastic Modulus190 GPa

Product Forms & Standards

Seamless PipeASTM B423
Welded PipeASTM B705
Seamless TubeASTM B423
Heat Exchanger TubeASTM B163
Welded TubeASTM B704
Plate / Sheet / StripASTM B424
Bar / RodASTM B425
ForgingsASTM B564
Pipe FittingsASTM B366
FlangesASTM B564

Key Features of Incoloy 825

Excellent Corrosion Resistance

Strong resistance to oxidizing and reducing acids, seawater, and polluted environments.

High Temperature Strength

Maintains mechanical properties at elevated temperatures up to 650°C.

Stress Corrosion Cracking Resistant

Resists chloride stress corrosion cracking in harsh environments.

Fabricability

Good weldability and machinability for industrial fabrication.

Typical Applications of Alloy 825 Products

Chemical Processing

Acid handling equipment and process systems.

Oil & Gas

Offshore piping and downhole systems.

Pollution Control

FGD systems and waste treatment plants.

Available Incoloy 825 Products

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