It is a duplex stainless steel of austenitic, ferritic, martensitic any two-phase structure of about half the proportion of each component made of stainless steel. But generally it refers to austenitic - ferritic duplex stainless steel. It is both austenitic and ferritic stainless steel features, with good mechanical properties, high strength, high toughness; good resistance to crevice corrosion, pitting corrosion, stress corrosion cracking capacity; good resistance to uniform corrosion ability; good welding performance, small thermal cracking tendency; thermal coefficient of linear expansion coefficient and other characteristics. Widely used in methanol production of tubular catalytic reactor tubes; pulp and paper industry sulfate cooking preheat tubes; especially in gathering pipelines offshore and onshore oil; vinyl chloride production precondenser; crude oil desalter heat exchangers, and other fields.
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