Incoloy 825

Incoloy 825(UNS N08825)

Incoloy 825 (UNS N08825) is a ni-fe-cr-mo Ti-stabilized alloy with excellent resistance to sulfuric and phosphoric acids. Resistant to reducing and oxidizing acids, pitting, stress-corrosion cracking and intergranular corrosion, it is used in chemical and petrochemical processing, oil and gas extraction, pollution control, waste processing and pickling applications.

Equivalent Grades

Trademarks	GB	JIS	KS	ASTM	UNS	DIN	W.Nr	GOST	BS	NF
Incoloy 825	GH1140 NS1402	NCF 825	NCF 825	Incoloy 825	N08825	NiCr21Mo	2.4858	ЭИ602	NA16	–

Product Forms

Wire, Bar, Strip, Sheet, Plate, Tube, Pipe, Pipe Fittings, Forgings

Chemical Composition,%

C	P	S	Mn	Si	Cr	Ni	Mo	Al	Ti	Cu	Fe
≤0.05	≤0.03	≤0.03	≤1.00	≤0.50	19.50~23.50	38.00~46.00	2.50~3.50	≤0.20	0.60~1.20	1.50~3.00	≥22.00

Typical Physical & Mechanical Properties (RT, Annealed)

Density, g/cm3	Melting Point, ℃	Tensile Strength, MPa	Yield Strength, MPa	Elongation,%
8.14	1370-1400	690	310	45

Specifications

Rod, Bar, Wire, Forgings	ASTM B425/ASME SB425, ASTM B564/ASME SB564, ISO 9723/9724/9725, DIN 17752/17753/17754
Plate, Sheet, Strip	ASTM B424/B409/B906/ASME SB424/SB409/SB906, ISO 6208
Pipe, Tube	ASTM B163/ASME SB163, ASTM B407/B829/ASME SB407/SB829, ASTM B514/B775/ASME SB514/SB775, ASTM B515/B751/ASME SB515/SB751, ISO 6207
Others	ASTM B366/ASME SB366(Fittings)

Features

Good resistance to stress-corrosion cracking
Satisfactory resistance to pitting and crevice corrosion
Good resistance to oxidizing and non-oxidizing hot acids
Good mechanical properties at both room and elevated temperatures, up to approximately 550℃
Approval for pressure vessels with wall temperatures up to 450℃

Applications

Components such as heating coils, tanks, crates, baskets and chains in sulphuric acid pickling plants
Sea-water-cooled heat exchangers, offshore product piping systems; tubes and components in sour gas service
Heat exchangers, evaporators, scrubbers, dip pipes etc. in phosphoric acid production
Air-cooled heat exchangers in petroleum refineries
Food processing
Chemical plant