How is the solid solution treatment of stainless steel seamless tube?

    For stainless steel seamless pipes, the three elements of solution treatment are temperature, holding time and cooling rate. What is the effect of solution treatment of stainless steel seamless pipe?

    1. Make the structure and composition of stainless steel seamless pipe uniform, which is especially important for raw materials, because the rolling temperature and cooling speed of each section of hot-rolled pipe are different, resulting in inconsistent structure. At high temperatures, atomic activity intensifies, the σ phase dissolves, the chemical composition tends to be uniform, and a uniform single-phase structure is obtained after rapid cooling.

    2. Eliminate work hardening to facilitate continued cold processing. Through the solution treatment, the twisted crystal lattice is restored, the elongated and broken grains are recrystallized, the internal stress is eliminated, the tensile strength of the steel wire is reduced, and the elongation is increased.

    Restore the inherent corrosion resistance of stainless steel pipes. Due to cold working, carbide precipitation and lattice defects reduce the corrosion resistance of stainless steel pipes. After solution treatment, the corrosion resistance of stainless steel seamless pipe is restored to the best state.

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