热轧奥氏体不锈钢带钢酸洗工艺机理分析

 详细分析了热轧奥氏体不锈钢带钢的表面氧化皮形成机理、退火对氧化皮特性的影响机理、酸洗工艺机理。结论是：热轧奥氏体不锈钢带钢表面氧化皮外层主要以铁氧化物为主，内层主要以交替分布的Cr2O3和FeCr2O4层为主；退火后，氧化皮结构变得疏松多孔，且易脱落，贫铬层厚度增加，带钢更加容易酸洗；酸洗时，带钢表面的氧化皮主要通过机械剥离作用去除。分析结果对热轧奥氏体不锈钢带钢酸洗技术的改进具有一定的理论指导意义。

Analysis of Pickling Process Mechanism of Hot-Rolled Austenitic Stainless Steel Strip

The formation mechanism of surface oxide scale, the mechanism of the effect of annealing on surface oxide scale, and the pickling process mechanism of hot-rolled austenitic stainless steel strip were analyzed in details, respectively. The results shows that the outer layer of oxide scale is mainly composed of iron oxide and the inner layer is alternatively distributed Cr2O3 and FeCr2O4. After annealing, the oxide scale becomes loose and porous and is easy to fall off. Meanwhile, the chromium depleted layer becomes thicker. All these make the pickling of strip much more easily. In addition, the surface oxide scale is primarily removed by mechanical stripping during pickling. The analysis of the results has certain theoretical significance for the improvement of hot-rolled austenitic stainless steel strip pickling technology.