The solid solution temperature is mainly determined according to the chemical composition. Generally speaking, the solid solution temperature should be increased correspondingly for the grades with many kinds of alloying elements and high content. Especially for stainless steel with high content of manganese, molybdenum, nickel and silicon, the softening effect can only be achieved by increasing the solid solution temperature and making it fully dissolved. However, stabilized steel, such as 321 stainless steel tube, when the solid solution temperature is high, the carbide of the stabilizing element is fully dissolved in austenite, and will precipitate in the grain boundary in the form of Cr23C6 during subsequent cooling, causing intergranular corrosion. In order to prevent the carbides (TiC and NbC) of the stabilizing elements from decomposing or solid solution, the lower solid solution temperature is generally used.
3. Restore the inherent corrosion resistance of stainless steel seamless pipes. Due to the precipitation of carbides and lattice defects due to cold working, the corrosion resistance of stainless steel seamless pipes is reduced. After the solution treatment, the corrosion resistance of the stainless steel seamless pipe is restored to the best state.
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