Duplex stainless steel is also called duplex steel. Steel composed of martensite, austenite or bainite and ferrite matrix. Generally, the steel composed of ferrite and austenite is called duplex stainless steel. In the solid solution structure of duplex stainless steel, there are 50% ferrite and 50% austenite. Duplex stainless steel combines the advantages of austenitic and ferritic stainless steel. Duplex stainless steel has the advantages of high strength, good resistance to chloride stress corrosion, strong formability, high weldability and good resistance to intergranular corrosion.
Performance characteristics and application:
- The dual-phase stainless steel added with trace element molybdenum has good chloride stress corrosion resistance under low stress. Therefore, it can be well used in the chemical industry to prepare heat exchanger, evaporator and other equipment.
- It has good wear resistance and fatigue resistance. These characteristics are widely used in power equipment requiring high strength and corrosion resistance, such as pumps, valves, etc.
- It has good weldability and low tendency of hot cracking. It can be used for dissimilar welding with austenitic stainless steel or carbon steel and other metals.
- It has good thermal conductivity and small linear expansion coefficient, which makes it suitable for manufacturing equipment lining, composite plate and tube core of heat exchanger.
Application case:
In China, duplex stainless steel is mainly used in petrochemical industry. It can still maintain excellent performance in highly corrosive environment, such as ethylene plant, ethylene oxide cracking ethylene plant, etc. The corrosion resistance of duplex stainless steel mainly depends on the chromium content, and the chromium content mainly depends on the iron content. Compared with austenitic stainless steel, duplex stainless steel has higher corrosion resistance. For example, it can be used to manufacture corrosion resistant steel or low-temperature steel in ethylene plant.
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