Incoloy 825, Alloy 825, UNS N08825, Nickel 825, NiCr21Mo

Incoloy 825, Alloy 825, UNS N08825, Nickel 825, NiCr21Mo - Introduction and Application

lncoloy 825 is an austenitic nickel-iron-chromium-molybdenum-copper alloy containing high levels of chromium, nickel, copper and molybdenum to provide high levels of corrosion resistance to both moderately oxidizing and moderately reducing environments.It has a high nickel content, sufficient to resist chloride ion stress corrosion cracking, and a very stable austenite structure. The levels of molybdenum and copper enable the alloy to resist reducing agents and acids. Chromium gives resistance to oxidising conditions, such as nitric acid solutions, nitrates and oxidising salts. The alloy is titanium stabilised to resist pitting and intergranular attack after fabrication, particularly welding, which includes heating in the critical sensitisation temperature range (650°C – 760°C).This balance of alloying elements grants this alloy exceptional resistance to both chloride stress corrosion cracking, as well as crevice corrosion and general corrosion. It is the high level of nickel in combination with the amount of molybdenum and copper in this nickel alloy produces substantially improved corrosion resistance in a corrosive environment such as reducing environments compared to stainless steel. The addition of titanium in this alloy also helps to stabilize the alloy against intergranular corrosion. Chloride stress corrosion cracking is a type of localised intergranular corrosion on materials that are put under tensile strength, in high temperatures and in an environment that includes oxygen and chloride ions such as seawater.

Alloy 825 offers exceptional resistance to corrosion by sulphuric and phosphoric acids and is often the most cost effective alloy in sulphuric acid service.

We can supply this alloy as Coil, plate, sheet, strip, bar, rod, wire, tube, pipe, fittings, fasteners In the oil and gas industry, the two most important nickel alloys are Inconel 625 and Incoloy 825.

Incoloy 825, Alloy 825, UNS N08825, Nickel 825, NiCr21Mo - Chemical composition WT %

Mechanical Property of Incoloy 825, Alloy 825, UNS N08825, Nickel 825, NiCr21Mo

Heat Treatment of Incoloy 825, Alloy 825, UNS N08825, Nickel 825, NiCr21Mo

Incoloy 825 can be readily hot or cold worked. Hot working should be in the range 870 – 1180°C, finishing at 870 – 980°C. For maximum corrosion resistance hot worked parts should be stabilise annealed before use. The alloy is easier to cold form than stainless steels. Incoloy 825 is stabilise annealed at 940°C. The softest structure is obtained at 980°C. Sections heavier than sheet, strip and wire should be quenched to avoid sensitisation.

Welding of Incoloy 825, Alloy 825, UNS N08825, Nickel 825, NiCr21Mo

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.

Machining of Incoloy 825, Alloy 825, UNS N08825, Nickel 825, NiCr21Mo

Incoloy 825 is classed as a ‘C’ alloy, and is reasonably easy to machine.

Equivalent grades of Incoloy 825, Alloy 825, UNS N08825, Nickel 825, NiCr21Mo

In the steel grades above we can supply:

• Incoloy 825, Alloy 825, UNS N08825, Nickel 825, NiCr21Mo Steel bar
• Incoloy 825, Alloy 825, UNS N08825, Nickel 825, NiCr21Mo Steel plate and sheet
• Incoloy 825, Alloy 825, UNS N08825, Nickel 825, NiCr21Mo Open die and closed die forgings and forged steel
• Incoloy 825, Alloy 825, UNS N08825, Nickel 825, NiCr21Mo Hot extrusion and cold-rolled welded seamless tubes pipe
• Incoloy 825, Alloy 825, UNS N08825, Nickel 825, NiCr21Mo Hot-rolled and Cold-rolled strip steel
• Incoloy 825, Alloy 825, UNS N08825, Nickel 825, NiCr21Mo Steel wire
• Incoloy 825, Alloy 825, UNS N08825, Nickel 825, NiCr21Mo Special shaped

Incoloy 825, Alloy 825, UNS N08825, Nickel 825, NiCr21Mo Nickel and High Temperature Alloys stock list