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What role does the stainless steel seamless tube solid solution treatment
Solid solution temperature first decided based on chemical composition. Generally speaking, high content of alloy elements and trademark, the solid solution temperature to progress accordingly. Especially manganese, molybdenum, nickel, high content of silicon steel, only progress solid solution temperature, to dissolve the energetic, ability to soften effect. But safe steel, such as 321 stainless steel tube, solid solution at high temperature stability of elements full dissolved in austenite, carbide in the subsequent cooling in the grain boundary in Cr23C6 form separated, form intergranular corrosion. In order to secure the elements of the carbide (TiC and NbC) differentiation, solid solution, usually choose the lower solid solution temperature.
About stainless steel seamless tube, the three elements of solid solution treatment temperature, holding time and cooling rate. Stainless steel seamless tube solid solution treatment have what effect?
1: made of stainless steel seamless pipe arrangement and composition is uniform, the material is special, mainly because of the hot rolled steel tubes paragraphs rolling temperature and cooling rate, forming arrangement structure is inconsistent. Atomic activity at high temperatures is aggravating, sigma phase solubility, tend to be more uniform chemical composition, rapid cooling after obtain uniform single-phase arrangement.
2: remove the work hardening, to facilitate continuous cold working. Through the solid solution treatment, skew lattice rehabilitation, elongation and broken grain crystallization from scratch, eliminate internal stress, reduced wire tensile strength, elongation increased.
3: rehabilitation stainless steel tube inherent corrosion resistant function. Because of cold forming carbide separated, lattice defects, lower the stainless steel tube corrosion resistant function. Stainless steel seamless tube corrosion after solid solution treatment function recovery to the best condition.
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