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在卧式连续喷淋酸洗机组上,利用原设备和H2SO4+(HNO_3+HF)酸洗液技术酸洗双相不锈钢中厚板,酸洗后表面出现浅灰色、下表面辊印缺陷。针对这些缺陷,以S32205双相不锈钢板为代表牌号,论述一种两段式混酸(HNO_3+HF)液酸洗方法,开展了两段式混酸(HNO_3+HF)液酸洗方法的实验室、工业化工艺试验和研究,并对原卧式喷淋酸洗生产线进行了技术改造。应用两段式混酸(HNO_3+HF)液工艺技术酸洗S32205钢板,在预先酸洗工艺段,混酸液HNO_3质量浓度为180g/L、HF质量浓度为90g/L,混酸液温度为43℃;在最终酸洗工艺段,混酸液HNO_3质量浓度为265g/L、HF质量浓度为56g/L,混酸液温度为43℃,一次酸洗合格率达到95%以上。从技术上解决了双相不锈钢中厚板酸洗后表面出现的浅灰色、下表面辊印缺陷,酸洗后的钢板表面呈银白色,色泽均匀,满足了双相不锈钢板产品标准关于表面质量的要求。
On the horizontal continuous pickling and pickling unit, the duplex stainless steel plate was pickled by using the original equipment and H2SO4 + (HNO3 + HF) acid pickling solution. In view of these defects, taking S32205 duplex stainless steel plate as a representative grade, a two-stage acid-washing method of mixed acid (HNO 3 + HF) was discussed and a two-stage mixed acid (HNO 3 + HF) Industrial process test and research, and the original horizontal spray pickling production line has been technological transformation. S32205 steel was pickled by using two-stage mixed acid technology (HNO 3 + HF). In the pre-pickling process, the mass concentration of HNO 3 was 180g / L, the mass concentration of HF was 90g / L and the temperature of mixed acid was 43 ℃. In the final pickling process, the mass concentration of HNO_3 in mixed acid was 265g / L, the mass concentration of HF was 56g / L, the temperature of mixed acid was 43 ℃, and the passing rate of one pickling reached more than 95%. Technically solved the surface of the duplex stainless steel plate after pickling light gray, the lower surface of the roll printing defects, pickled steel surface was silver white, uniform color, to meet the duplex stainless steel product standards on the surface quality Request.