1. The difference between ordinary stainless steel and duplex stainless steel
Ordinary stainless steel is what we usually call austenitic stainless steel, which is mainly composed of ferrite and chromium. Duplex stainless steel is composed of two different metallographic structures: ferrite and austenite. This is also one of the biggest differences between duplex stainless steel and ordinary stainless steel.
2. Chemical composition
Ordinary stainless steel usually contains 17% to 25% chromium, 8% to 25% nickel, and small amounts of carbon, silicon, manganese and other elements. Duplex stainless steel requires sufficient chromium, nickel, molybdenum, copper and other elements. In addition, during the cold treatment process, some rare earths, indentation strengthening elements, etc. will also be added.
3. Physical properties
The hardness of ordinary stainless steel is lower than that of duplex stainless steel, so its high temperature resistance and corrosion resistance are poor. In contrast, duplex stainless steel is harder and has the advantages of both austenite and ferrite, so it has a wider range of uses and can be used to manufacture equipment and parts in some extreme environments.
4. Application scope
Ordinary stainless steel is widely used in building materials, kitchenware, chemical equipment, medical equipment and other fields. Duplex stainless steel performs better in fields such as oil and gas, chemicals, pharmaceuticals, nuclear power plants and aerospace. For example, in oil well geological exploration, duplex stainless steel can help seal the well wall and avoid oil leakage accidents.
To sum up, duplex stainless steel differs from ordinary stainless steel in its chemical composition, physical properties and application range. Although the price of duplex stainless steel is relatively high, its excellent properties and wide range of applications make it particularly important in some special circumstances.
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