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Differences between Duplex Stainless Steel and Stainless Steel (Advantages and Disadvantages)
In duplex stainless steel, the ferrite phase and austenite phase account for half in its hardened structure, and the minimum phase content may reach 30%. In the case of low C content, the Cr content is 18%~28%, and the Ni content is 3%~10%. Some steels also contain alloying elements such as Mo, Cu, Nb, Ti, and N.
This type of steel has both the characteristics of austenitic and ferritic stainless steel. Compared with ferrite, it has higher plasticity and toughness, no room temperature brittleness, significantly improved intergranular corrosion resistance and welding performance, while maintaining iron The 475 ℃ brittleness and high thermal conductivity of element stainless steel have the characteristics of superplasticity. Compared with austenitic stainless steel, it has high strength and significantly improved resistance to intergranular corrosion and chloride stress corrosion. Duplex stainless steel has excellent pitting corrosion resistance and is also a nickel-saving stainless steel.
Product Advantages
Compared with austenitic stainless steel, the disadvantages of duplex stainless steel are as follows:
(1) The universality and versatility of application are not as good as that of austenitic stainless steel. For example, its use temperature must be controlled below 250 °C.
(2) Its plasticity and toughness are lower than that of austenitic stainless steel, and its cold and hot working processes and forming properties are not as good as that of austenitic stainless steel.
(3) There is a medium temperature brittle zone, and it is necessary to strictly control the process system of heat treatment and welding to avoid the appearance of harmful phases and damage the performance.
Compared with ferritic stainless steel, the disadvantages of duplex stainless steel are as follows:
The content of alloying elements is high, the price is relatively high, and generally ferrite does not contain nickel.
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