1、让冷拔钢管组织和成分均匀一致，这对原料尤其重要，因为热轧管材各段的轧制温度和冷却速度不一样，造成组织结构不一致。在高温下原子活动加剧，σ相溶解，化学成分趋于均匀，快速冷却后就获得均匀的单相组织。

1. It is especially important for raw materials to make the structure and composition of cold-drawn steel tubes uniform, because the rolling temperature and cooling rate of each section of hot-rolled steel tube are different, which results in the inconsistency of the structure. At high temperature, atomic activity intensifies, _phase dissolves, chemical composition tends to be uniform, and uniform single-phase structure can be obtained after rapid cooling.

2、消除加工硬化，以利于继续冷加工。通过固溶处理，歪扭的晶格恢复，伸长和破碎的晶粒重新结晶，内应力消除，钢丝抗拉强度下降，伸长率上升。

2. Eliminate work hardening to facilitate the continuation of cold working. After solution treatment, the distorted lattice is restored, the elongated and broken grains are recrystallized, the internal stress is eliminated, the tensile strength of steel wire decreases, and the elongation increases.

3、恢复冷拔钢管固有的耐蚀性能，由于冷加工造成碳化物析出，晶格缺陷，让冷拔钢管耐蚀性能下降。固溶处理后冷拔钢管耐蚀性能恢复到合适状态。

3. To restore the inherent corrosion resistance of cold-drawn steel tubes, the corrosion resistance of cold-drawn steel tubes is reduced due to the precipitation of carbides and lattice defects caused by cold processing. After solution treatment, the corrosion resistance of cold-drawn steel pipe restored to an appropriate state.