What are the forming elements of austenitic stainless steel seamless pipe?

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Huzhou Nanxun Yintuo Special Material Technology Co., Ltd. specializes in the development and production of high-quality stainless steel seamless tubes and nickel-nickel alloys.

Huzhou Nanxun Yintuo Special Material Technology Co., Ltd. specializes in the development and production of high-quality stainless steel seamless tubes and nickel-nickel alloys. Now let’s introduce austenitic stainless steel seamless pipe.

Austenitic stainless steel pipes contain high nickel content and other austenite-forming elements, which promote the formation of austenite phase, making it stable at room temperature or even lower temperatures. Ferritic stainless steel seamless pipes contain elements that weaken the formation of austenite, such as high chromium content, which makes ferrite the dominant phase component. The martensitic stainless steel tube is austenitic at high temperature, but this austenite is suitably unstable and transforms when it is cooled. The microstructure of the stainless steel tube can be controlled by the balance between the austenite forming element and the ferrite forming element. The adjustment of the balance between the two elements plays an important role in the mechanical properties, corrosion resistance and weldability of stainless steel pipes.

The addition of aluminum, titanium, copper and molybdenum to the stainless steel seamless tube can promote the precipitation reaction and strengthen the steel. The precipitation hardening (PH) martensitic stainless steel seamless tube containing Cu, Al and Mo. After heat treatment, the room temperature yield strength of more than 1375MPa (200k8i) can be obtained. Austenitic stainless steel seamless tube often contains titanium and aluminum to form nickel-titanium It is similar to the precipitation strengthening phase of nickel-aluminum precipitation phase in nickel-based superalloys. Aluminum is a ferrite-forming element in solid solution, while copper is a weak austenite-forming element whose composition is close to that of pure copper. Strengthen martensitic steels such as 174PH steel. Ferrite forming elements include: chromium, molybdenum, silicon, niobium, titanium aluminum, vanadium, and tungsten. Austenite forming elements include nickel, manganese, carbon, nitrogen, copper, and cobalt.

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