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Incoloy 825

Material: Incoloy 825, UNS N08825, 2.4858

Incoloy 825 (UNS N08825, 2.4858)is a nickel-iron-chromium alloy with additions of molybdenum, copper and titanium. Alloy 825 is similar to alloy 800 but has improved resistance to aqueous corrosion. The high nickel content makes the alloy effective against stress corrosion cracking.

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What Is Incoloy 825?

Incoloy is a nickel-iron-based high-temperature alloy designed for use in highly corrosive environments and extreme temperatures. These alloys combine excellent oxidation and corrosion resistance with high mechanical strength, especially at high temperatures. Unlike Hastelloy, Incoloy contains a large amount of iron and is relatively low in cost. Common incoloy include alloy 800 and alloy 825.

Incoloy 825 (UNS N08825) is an austenitic nickel-iron-chromium alloy. Alloy 825 is similar to Alloy 800, but its resistance to aqueous corrosion is improved. Alloy 825 has good corrosion resistance and can withstand a variety of corrosive media such as sulfuric acid, nitric acid and sodium hydroxide in the same equipment. It also has good formability and weldability, suitable for most processing.

Incoloy 825 Composition

Grade	C≤	Mn≤	Si≤	S≤	Cu	Fe≥	Ni	Cr	Al≤	Ti	Mo
Incoloy 825	0.05	1.0	0.5	0.03	1.5-3.0	22	38.0-46.0	19.5-23.5	0.2	0.6-1.2	2.5-3.5

Alloy 825 Mechanical Properties

Grade	Tensile, min, ksi[MPa]	Yield, min, ksi[MPa]	Elongation, %(min)
Incoloy 825	85[586]	35[241]	30%

Material 825 Physical Properties

Properties	Value
Density	8.1 g/cm³
Melting point	1370 - 1400℃
Thermal conductivity (100℃)	10.8 λ/(W/m*℃)
Specific heat	440 J/kg*℃
Elastic modulus	195 GPa
Shear modulus	-
Resistivity	1.37 μΩ*m
Poisson's ratio	-
Linear expansion coefficient (20-100℃)	14.1 a/10^-6℃^-1

Incoloy 825 World Equivalent Grades

STANDARD	WERKSTOFFNR.	UNS	JIS	BS	GOST	AFNOR	EN	OR
Incoloy 825	2.4858	N08825	NCF 825	NA 16	ЭП703	NFE30C20DUM	NiCr21Mo	XH38BT

Incoloy 825 ASTM Product

Product	Standard	Show
Pipe SMLS	ASTM B423
Tube SMLS	ASTM B423
Sheet/Plate/Strip	ASTM B424
Bar /Rod	ASTM A425
Forging /Flange	ASTM B564
Fittings	ASTM B366
Pipe Welded	ASTM B474

Incoloy 825 Applicaiton

Heating tubes, containers, and chains for sulfuric acid pickling plants.
Seawater cooling heat exchangers, marine product piping systems.
Sour gas environment piping: heat exchangers, evaporators, scrubbers, dip tubes, etc. In.
Air heat exchangers in petroleum refining.
Food engineering chemical process.
Flame Retardant Alloys for High Pressure Oxygen Applications.