Ferritic-austenitic duplex stainless steel pipe is stainless steel in which austenite and ferrite each account for about half of the structure.
In the case of low C content, the Cr content is 18% to 28%, and the Ni content is 3% to 10%. Some steels also contain alloying elements such as Mo, Cu, Si, Nb, Ti, and N.
This type of steel has the characteristics of austenitic and ferritic stainless steel. Compared with ferrite, it has higher plasticity and toughness, no room temperature brittleness, and significantly improved intergranular corrosion resistance and welding performance, while still maintaining iron The 475℃ brittleness, high thermal conductivity, and superplasticity of element stainless steel.
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 nickel-saving stainless steel.
The formation of the ferrite phase has the following effects on the properties of austenitic stainless steel. The appearance of the F phase generally has an adverse effect on the performance of austenitic stainless steels, such as increasing the tendency of hot working to produce cracks; the pitting resistance of steel decreases and the corrosion resistance deteriorates in many corrosive environments; When heating for a long time at high temperature, the F phase will be transformed into the σ phase to make the steel brittle and so on.
If you want to know more about stainless steel seamless pipe, you can consult Huzhou Nanxun Yintuo Special Material Technology Co., Ltd.