Duplex stainless steel combines the advantages of austenitic and ferritic stainless steel. Such as high strength, good toughness, excellent corrosion resistance and weldability. It is used in a wide range of fields, including chemical, petroleum, offshore engineering, food processing, paper and medical industries.
Features of Duplex Stainless Steel
1. Organizational structure: composed of austenite and ferrite two phases, this organizational structure gives its unique properties.
2. High strength and toughness: Combining the advantages of austenitic stainless steel and ferritic stainless steel. It has high strength and good toughness.
3.Corrosion resistance: Excellent corrosion resistance enables it to maintain long-term stability in many environments.
4. Weldability: easy to weld, the joint also maintains good corrosion resistance and mechanical properties.
Operation Cautions
1. Processing and heat treatment: Special care is needed to avoid adverse effects on the organizational structure and properties of the material. Excessive heat input should be avoided during processing to prevent the transition of austenite to ferrite phase.
2. Welding: It is necessary to choose the appropriate welding method and welding material to ensure that the welded joint has good corrosion resistance and mechanical properties. It is necessary to control the welding heat input in the welding process to avoid excessive ferrite phase in the weld area.
3. Surface treatment: Surface treatment is very important to prevent corrosion and improve service life. Mechanical polishing, chemical polishing or electrochemical polishing can be used to remove oxides and dirt on the surface and improve the corrosion resistance of the surface.
4. Use environment: During use, it is necessary to avoid contact with strong corrosive media such as strong acid and alkali to prevent corrosion and damage to materials. At the same time, when used in a high temperature or high humidity environment, it is also necessary to pay attention to prevent corrosion and stress corrosion cracking of the material.
Applications
1. Chemical equipment: duplex stainless steel has excellent corrosion resistance and high strength toughness. Therefore, workers will use it to manufacture chemical equipment, such as manufacturing reactors, distillation towers, heat exchangers and other equipment.
2. Petroleum equipment: It can withstand the harsh environment such as high temperature and high pressure. So it can manufacture oil equipment, such as manufacturing oil well casing, tubing, oil and gas pipelines and other equipment.
3. Pharmaceutical equipment: It has good corrosion resistance and good processing performance, and can manufacture parts of various shapes and sizes. Therefore, it can manufacture pharmaceutical equipment, such as manufacturing reactors, dryers, mixers and other equipment.
4. Food equipment: It has good corrosion resistance and good hygiene performance, and can meet the hygiene requirements of food equipment. So it can manufacture food equipment, such as manufacturing storage tanks, pipes, heaters and other equipment.
5. Marine industry: The corrosion problem of steel and seawater can not be solved by conventional stainless steel. So it is widely used in offshore drilling platforms, ships and Marine structures.
6. Natural gas industry: It has shown good corrosion resistance and wear properties in different gaseous fluids. And it has been widely used in the process of natural gas production, storage and transmission.
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