Stainless Seamless Tube of the Effect of Solid Solution Treatment
For stainless seamless tubes, the three elements of solid solution treatment temperature, holding time, and cooling rate. Stainless steel seamless tube solid solution treatment effect is as follows:
1: stainless seamless tube organization and composition are uniforms, it is especially important for raw materials, because the hot rolled steel tubes paragraphs 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 getting 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 stainless steel tube inherent corrosion resistance. Carbide precipitation due to cold working, lattice defects, make the stainless steel pipe corrosion-resistant performance degradation. Stainless steel seamless tube corrosion resistance after solid solution treatment back to its best.
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 dissolve, to achieve a softening effect. But stabilized steel, such as 321 stainless steel tube, 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.