what decide the solution treatment of stainless steel seamless pipes

There are three elements for solution treatment of the stainless steel seamless pipes as following: temperature, holding time and cooling rate.

★ First, make stainless steel organization and composition uniform, so it is an important factor for the raw material, hot-rolled pipes of each section rolling temperature and cooling rate are not the same, which lead to tissue structure is inconsistent. That is why exacerbates atomic activities, phase dissolution and chemical composition tending to be balance at high temperature. After rapid cooling, make stainless steel obtain homogeneous.

★ Eliminate processing hardening so as to be good for continued cold. Through solution treatment, make the ill-natured lattice recovery, elongation and breakage grains recrystallized; internal stress eliminate, tensile strength of seamless stainless steel tube decline and elongation increase.

★ Recover inherent corrosion resistance of stainless steel. Due to cold processing carbide precipitation and lattice defects make stainless steel corrosion resistant performance fall. After solution treatment, the corrosion resistant of seamless stainless steel pipes can be back to the best.

Solution temperature is mainly determined by the chemical composition. Generally, for variety alloy elements and high content of brand, solution temperature needs to increase especially for the steel with high content manganese, molybdenum, nickel and silicon. As long as improve the solution temperature make it dissolves in order to achieve softening effect. For stale steel, like 1Cr18Ni9Ti, solution temperature at high temperature, stabilization element of carbide dissolves in austenite well. In the subsequent cooling, 1Cr18Ni9Ti will in the form of Cr23C6 in the grain boundary precipitates resulting in intergranular corrosion. As the saying goes, stainless steel is not easy to rust, actually, some parts of stainless steel contains not stainless but acid (corrosion) resistance.

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