UNS N08825, 2.4858 comparable to Incoloy 825 Alloy
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Specification, Chemical & Mechanical Performance
Corrosion Resistant Alloys
UNS N08825, 2.4858, comparable to Incoloy 825 Alloy
UNS N08825 is a high-Ni nickel alloy with high corrosion resistance, and possesses extremely high corrosion resistance against oxidizing and non-oxidizing acids.
Forms:
Workability
Cold and hot workability are approximately equal to those of standard austenitic stainless steels.
Weldability
Possible welding methods include shielded metal arc welding, TIG welding, and MIG welding, in the same manner as with standard austenitic stainless steels. As welding consumables, Alloy 625, DNiCrMo-3 should be used.
Machinability
NAS 825 has machinability approximately equivalent to standard austenitic stainless steels. In machining, use of a high speed steel tool or superhard tool and a slow feed speed and large cut depth are advised.
Heat Treatment
Heat treatment conforms to that for stable austenitic stainless steel (Type 321). Solution heat treatment should be performed somewhat lower than with Type 304, at 930~1030℃ with rapid cooling.
Pickling
A mixture of nitric acid and hydrofluoric acid is used in pickling. However, due to the high corrosion resistance of Alloy 825, scale is somewhat difficult to remove in comparison with Type 304. Therefore, the material should be immersed in an alkaline solution before pickling, or if possible, shot blasting is extremely effective.
Applications
Oil drilling, chemical plants
