Nickel & Nickel Alloys 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.


1. Chemical Composition Requirements

The Chemical Composition of Incoloy 825, %
Nickel 38.0-46.0
Iron ≥22.0
Chromium 19.5-23.5
Molybdenum 2.5-3.5
Copper 1.5-3.0
Titanium 0.6-1.2
Carbon ≤0.05
Manganese ≤1.00
Sulfur ≤0.030
Silicon ≤0.50
Aluminum ≤0.20

2. Mechanical Properties of Incoloy 825

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

Tensile Strength, min. Yield Strength, min. Elongation, min. Elastic Modulus
Mpa ksi Mpa ksi % Gpa 106psi
690 100 310 45 45 206 29.8

3. Physical Properties of Incoloy 825

Density Melting Range Specific Heat Electrical Resistivity
g/cm3 °C °F J/kg.k Btu/lb. °F µΩ·m
8.14 1370-1400 2500-2550 440 0.105 1130

4. Product Forms and Standards of Incoloy 825

Product form Standard
Rods and bars ASTM B425, DIN17752
Plates, sheet and strips ASTM B906, B424
Seamless pipes and tubes ASTM B423, B829
Welded pipes ASTM B705, B775
Welded tubes ASTM B704, B751
Welded pipe fittings ASTM A366
Forging ASTM B564, DIN17754

Post time: Oct-23-2020