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

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

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