For stainless steel seamless pipe, the three elements of the solution treatment temperature, holding time and cooling rate. The role of stainless steel seamless solution at the following:
1: Make stainless steel seamless organization and composition uniform, which is particularly important for the raw material, because hot-rolled pipes of each section rolling temperature and cooling rate are not the same, resulting in tissue structure is inconsistent. Exacerbated at high temperature atomic activities, σ phase dissolution, chemical composition tends to be uniform, after rapid cooling to obtain a homogeneous single phase.
2: Eliminate hardening, in order to facilitate continued cold. By solution treatment, recovery distorted lattice, elongated and broken grains recrystallization, to eliminate the internal stress, the wire tensile strength decreased, the elongation increased.
3: Restore the inherent corrosion resistance of stainless steel pipe. Because cold causes carbide precipitation, lattice defects, so that the corrosion resistance of stainless steel pipe fell. After solution treatment corrosion resistance of stainless steel seamless return to top form.