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6Mo (UNS S31254) Cost-effective Stainless Steel Material

Shandong Xinhe International Trade Co., Ltd2023-05-04

6Mo (UNS S31254) is a super austenitic stainless steel containing high levels of molybdenum and nitrogen, compared to traditional austenitic stainless steels such as 316L, the alloy has higher resistance to pitting and crevice corrosion and higher strength. The alloy provides excellent resistance to stress corrosion cracking, allows pipe to be cold formed, and can be used without re-annealing at test temperatures up to 120°C.

6Mo stainless steel chemical containers and pipelines, installation systems of offshore oil and gas platforms, condensers in contact with seawater or crude oil, heat exchangers and piping systems, filter presses in the pulp bleaching process, storage tanks and rollers, thermal power plants, steel Flue gas desulfurization equipment (FGD) in factories and petrochemical enterprises, crude oil distillation towers and packing, desalination equipment and pumps, servo water piping systems, transformer casings exposed to marine environments, pharmaceutical equipment, food production equipment.

6Mo (UNS S31254) steel was developed for use in halide-containing environments such as seawater, hydrochloric and sulfuric acids. The increased content of molybdenum in combination with chromium and nitrogen provides the level of resistance to pitting and crevice corrosion normally associated with high alloy nickel base alloys such as Alloy625 (UNS N06625).

It is austenite when annealed in the range of 1120-1200C. In the thermal processing range of 600-1000C (under certain process conditions, trace amounts of χ and σ intermetallic compound phases may be formed), these may exist in the form of grain boundary precipitates. Proper heat treatment and welding procedures will be required to ensure that deposits do not affect corrosion resistance.