- Material composition of duplex steel
Duplex steel, as the name suggests, is a kind of steel composed of two different organizational phases. Its organizational structure consists of ferrite and austenite, so it is also known as austenitic – ferritic duplex stainless steel. Ferrite is a high-strength, high-hardness, easy-to-machine metal structure, while austenite has very good corrosion resistance. Duplex steel organization composition ratio is usually 40% -60% ferrite and 40% -60% austenite.
Second, the manufacturing process of duplex steel
Duplex steel can be manufactured by controlling the cooling rate, composition design and heat treatment. Among them, the control of cooling rate and composition design is the key factor affecting the performance of duplex steel. Generally speaking, duplex steel can be adjusted by adjusting the ratio of chromium content, nickel content and other elements to adjust its mechanical properties and corrosion resistance.
Third, the application and advantages of duplex steel in the industrial field
Because duplex steel has both the corrosion resistance of stainless steel and the mechanical strength of carbon steel, it is widely used in oil and gas, chemical industry, shipping, food processing and other industrial fields. It has the following advantages:
- Strong corrosion resistance. Duplex steel has high austenite content, which has good corrosion resistance.
- Good weldability. Although duplex steel is difficult to weld, once welded successfully, its weld strength is high.
- High mechanical strength. Although duplex steel is a stainless steel, but its mechanical strength can be comparable to ordinary steel.
- Excellent processing performance. Duplex steel can be molded and processed by cold working and hot working.
In short, duplex steel has the advantages of stainless steel and ordinary steel, and can respond to the needs of different environments and industrial fields.