Incoloy 825, UNS N08825

Incoloy Alloys

The Incoloy alloys are used in a wide range of industries and applications around the world, including:

Aerospace Engineering                                                    Electrical Resistance Heating

Oil and Gas Extraction                                                       Power Generation

Automotive Engineering                                                    Electronics and Communications

Petrochemical Processing                                               Thermal Processing and Heat Treatment

Chemical Processing                                                        Marine Engineering

Pollution Control and Waste Processing                       Welding

Common Trade Names: Incoloy 825, Alloy 825, Nickelvac 825, Nicrofer 4241.

Limiting Chemical Composition, %  by Weight  

Nickel..........................................................................38.0-46.0
Iron...............................................................................22.0min.
Chromium....................................................................19.5-23.5 
Molybdenum ...................................................................2.5-3.5 
Copper............................................................................1.5-3.0
Titanium...........................................................................0.6-1.2
Carbon........................................................................0.05 max. 
Manganese...................................................................1.0max. 
Sulfur..........................................................................0.03max. 
Silicon...........................................................................0.5max.
Aluminum......................................................................0.2 max.

INCOLOY alloy 825 (UNS N08825, W.Nr. 2.4858) is a nickel-iron-chromium alloy with additions of molybdenum, copper, and titanium. The nickel content is sufficient for resistance to chloride-ion stress-corrosion cracking. The nickel, in conjunction with the molybdenum and copper, also gives outstanding resistance to reducing environments such as those containing sulfuric and phosphoric acids. The molybdenum also aids resistance to pitting and crevice corrosion. The alloy’s chromium content confers resistance to a variety of oxidizing substances such as nitric acid, nitrates and oxidizing salt. The titanium addition serves, with an appropriate heat treatment, to stabilize the alloy against sensitization to intergranular corrosion.

Available Product Forms: 
Pipe, tube, sheet, strip, plate, round bar, flat bar, forging stock, hexagon and wire.