What is the Role of Solution Treatment of Stainless Steel Seamless Pipes

What is the Role of Solution Treatment of Stainless Steel Seamless Pipes

The solid solution temperature is mainly determined based on the chemical composition. Generally speaking, if there are more varieties of alloy elements and the brand content is higher, the solid solution temperature should be increased accordingly. Especially for steel with high content of manganese, molybdenum, nickel and silicon, the softening effect can only be achieved by raising the solid solution temperature and fully dissolving it. However, in stabilized steels, such as 321 stainless steel pipes, the solid solution temperature is relatively high. When the stabilizing element carbide is fully dissolved in austenite, subsequent cooling will precipitate in the form of Cr23C6 at the grain boundaries, forming intergranular corrosion. . In order to stabilize the elements (TiC and NbC) that are not differentiated and do not form solid solutions in carbides, the lower limit of the solid solution temperature is usually selected.