In addition to corrosion resistance of oxidizing acid media, austenitic stainless steel seamless pipes can be resistant to corrosion by sulfuric acid, phosphoric acid, formic acid, acetic acid, urea, etc. if they contain Mo, Cu and other elements. If the carbon content of this type of steel is less than 0.03% or contains Ti and Ni, its resistance to intergranular corrosion can be significantly improved. High silicon austenitic stainless steel has good corrosion resistance to concentrated nitric acid. As austenitic stainless steel has comprehensive and good comprehensive properties, it has been widely used in various industries.
Austenitic stainless steel has a stable austenite structure at room temperature, high corrosion resistance, good cold workability and gcxxJ toughness, plasticity, weldability and non-magnetic properties. It has been widely used in heat exchanger condensers, evaporators and fluid transportation in chemical, oil refining, boilers, foxxJ and other industries.
Austenitic stainless steel can also produce castings. In order to improve the fluidity of molten steel and improve casting performance, the alloy composition of cast steel should be adjusted: increase the silicon content, widen the range of chromium and nickel content, and increase the upper limit of the impurity element sulfur.
Austenitic stainless steel should be solid-solution treated before use in order to maximize the solid solution of various precipitates such as carbides in the steel into the austenite matrix, while also homogenizing the structure and eliminating stress, so as to ensure excellent Corrosion resistance and mechanical properties. The correct solution treatment system is water cooling after heating at 1050～1150℃ (air cooling is also available for thin parts). The solution treatment temperature depends on the degree of alloying of the steel: molybdenum-free or low-molybdenum steel grades should be lower (≤1100℃), and higher alloyed grades such as 00Cr20Ni18Mo-6CuN, 00Cr25Ni22Mo2N, etc. should be higher (1080～1150) ℃).
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