UNS Number N08825

Incoloy 825 is a nickel-iron-chromium alloy with additions of molybdenum, copper and titanium. This nickel steel alloy’s chemical composition is designed to provide exceptional resistance to many corrosive environments. It is similar to alloy 800 but has improved resistance to aqueous corrosion. It has excellent resistance to both reducing and oxidizing acids, to stress-corrosion cracking, and to localized attack such as pitting and crevice corrosion. Alloy 825 is especially resistant to sulfuric and phosphoric acids. This nickel steel alloy is used for chemical processing, pollution-control equipment, oil and gas well piping, nuclear fuel reprocessing, acid production, and pickling equipment.

Available Forms of Incoloy 825 at Rooplaxmi Steels:

•           Bar
•           Sheet
•           Plate
•           Pipe & Tube (welded and seamless)
•           Pipe Fittings
•           Wire

Characteristics of Incoloy 825:

•           Excellent resistance to reducing and oxidizing acids
•           Good resistance to stress-corrosion cracking
•           Satisfactory resistance to localized attack like pitting and crevice corrosion
•           Very resistant to sulfuric and phosphoric acids
•           Good mechanical properties at both room and elevated temperatures up to approximately 1000°F
•           Permission for pressure-vessel use at wall temperatures up to 800°F

 

Incoloy 825 Chemical Composition, %:

Ni	Fe	Cr	Mo	Cu	Ti	C	Mn
38.0-46.0	22.0 min	19.5-23.5	2.5-3.5	1.5-3.0	0.6-1.2	0.05 max	1.0 max

S	Si	Al
0.03 max	0.5 max	0.2 max

 

Application of Incoloy 825:

•           Chemical Processing
•           Pollution-control
•           Oil and gas well piping
•           Nuclear fuel reprocessing
•           Components in Pickling equipment like heating coils, tanks, baskets and chains
•           Acid production

 

Machining and Fabrication with Incoloy 825:

Incoloy 825 can be readily hot or cold worked. Hot working should be in the range 870 – 1180°C, finishing at 870 – 980°C. Incoloy 825 is classed as a ‘C’ alloy, and is reasonably easy to machine. The alloy is readily weldable by the normal processes (GMAW (MIG), GTAW (TIG), SMAW (manual), SAW). The joint must be clean to avoid contamination of the weld pool. Incoloy 825 is stabilise annealed at 940°C. The softest structure is obtained at 980°C.

Incoloy 825 ASTM Specification:

Pipe Smls	Pipe Welded	Tube Welded	Sheet / Plate	Bar	Forging	Fitting
B423	B705	B751	B424	B425	B564	B366, B564

Welding Wire Designations:
AWS A5.14 – ERNiFeCr1

Mechanical Properties of Incoloy 825:
General

Tensile	85 ksi
Yield	(0.2 % offset) 30-35 ksi