Austenitic stainless steel with solid solution treatment to soften, the steel wire are heated to a temperature of about 950 ~ 1150 ℃, heat preservation for a period of time, make the carbide and various alloy elements fully dissolved in austenite, evenly and rapid quenching water cooling, carbon and other alloying elements can not afford time to precipitate, obtain pure austenitic organization, called the solid solution treatment. The effect of solid solution treatment with three points.
1, make steel wire organization, and composition is uniform, it is especially important for raw materials, because of the hot rolled wire rod paragraphs is not the same as the rolling temperature and cooling speed, caused the organizational structure. Atomic activity increased at high temperatures, the sigma phase solubility, tend to be more uniform chemical composition, rapid cooling after get uniform single-phase organization.
2, remove the work hardening, can continue to cold. Through the solid solution treatment, skew lattice, elongation and breakage of recrystallized grains, eliminate internal stress, the steel wire tensile strength decreased, elongation increased.
3, restore the inherent corrosion resistance stainless steel. Carbide precipitation due to cold working, lattice defects, make stainless steel corrosion resistant performance degradation. Steel corrosion resistance after solid solution treatment back to his best.
For stainless steel flange, the three elements of solid solution treatment temperature, holding time and cooling rate. Solid solution temperature is mainly determined according to chemical composition. Generally speaking, variety and high content of alloy elements brand, to increase solid solution temperature. Especially manganese, molybdenum, nickel, high content of silicon steel, only to improve the solid solution temperature, make it dissolves, to achieve a softening effect. But stabilized steel, such as 1 cr18ni9ti, solid solution at high temperature stabilization element of carbide dissolves in austenite, in the subsequent cooling in the grain boundary precipitates in Cr23C6 form, caused by intergranular corrosion. For the stabilizing element of carbide (TiC and NbC) decomposition, solid solution, generally USES the lower solid solution temperature.
Source: Zhejiang Yaang Pipe Industry Co., Limited (www.yaang.com)