Alloy 926 (1.4529/N08926):
Haverer Group produce alloy N08926 tube and pipe in China now. UNS N08926 is a high corrosion resistant stainless steel with high contents of chromium and molybdenum, and provides excellent corrosion resistance under severe environments such as high temperature seawater and flue gas desulfurization plants. Depending on the environment, it is a highly economical stainless steel with corrosion resistance comparable to that of Nickel alloy and pure titanium. Haverer Group produce this product in seamless tube and pipe form. Alloy 926 (1.4529/N08926) is an austenitic, special stainless steel. Due to its high molybdenum concentration, this alloy has a generally much improved corrosion resistance and resistance against pitting corrosion and crevice corrosion.
Workability
Cold and hot workability are approximately equal to those of Type 304, 316, and other standard austenitic stainless steels. However, care is necessary for both cold and hot worked materials because they have high strength.
Weldability
Possible welding methods include shielded metal arc welding, TIG welding, and plasma welding, in the same manner as with standard austenitic stainless steels. As welding consumables, Alloy 276 should be used. Preheating and post-welding heat treatment are not necessary.
Machinability
As a distinctive feature of high Ni stainless steels, machinability is difficult in comparison with the austenitic stainless steels, but is easier than with Ni-based alloys. Use of a superhard tool whenever possible, together with a slow feed speed and large cut depth, is advised.
Heat Treatment
Solution annealing of N08926 should be performed at 1100℃ and higher followed by being quenched in water or rapidly cooled by other means. (Conditions provided in ASTM A480/A480M)
Pickling
A mixture of nitric acid and hydrofluoric acid is used in pickling. However, due to the high corrosion resistance of N08926, 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
Seawater environments: Seawater desalination equipment, heat exchangers using seawater, condenser tubes, etc.
High concentration chloride ion environments: Flue gas desulfurization systems, pulp and papermaking industries, various types of bleaching equipment, etc.
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