公开了双相不锈钢中板表面处理方法，其包括：a )对所述双相不锈钢中板表面进行抛丸处理；以及b)对经过抛丸处理的双相不锈钢中板表面进行连续酸洗；其中所述连续酸洗包括第一连续酸洗和第二连续酸洗，所述第一连续酸洗使用单一酸，所述第二连续酸洗使用硝酸和氢氟酸的混酸，其中所述硝酸的浓度为30g/L-80g/L，所述氢氟酸的浓度为60g/L-85g/L，基于质量百分比， 所述双相不锈钢含有C≤0 .030％，Si≤1 .00％， Mn≤2 .0 0％ ，P≤0 .0 3 0％ ，S≤0 .0 2 0％ ， Cr 21 .00％-23 .00％，Ni 4 .50％-6 .50％，Mo 2 .50％-3 .50％，N 0 .14％-0 .20％，余量为铁及其他不可避免的杂质。使用本申请的方法实现了高效连续酸洗，表面色泽一致，满足了高端领域对钢板的高表面质量要求。

A surface treatment method for a duplex stainless steel mid-plate is disclosed, which includes: a) performing shot blasting on the surface of the duplex stainless steel mid-plate; and b) performing continuous pickling on the surface of the dual-phase stainless steel mid-plate after shot blasting; Wherein the continuous pickling includes a first continuous pickling and a second continuous pickling, the first continuous pickling uses a single acid, and the second continuous pickling uses a mixed acid of nitric acid and hydrofluoric acid, wherein the nitric acid The concentration of the hydrofluoric acid is 30g/L-80g/L, the concentration of the hydrofluoric acid is 60g/L-85g/L, based on mass percentage, the duplex stainless steel contains C≤0.030%, Si≤1.00% , Mn≤2.0 0%, P≤0.03 0%, S≤0.020%, Cr 21.00%-23.00%, Ni 4.50%-6.50%, Mo 2.50%-3.50%, N 0.14%-0.20%, the balance is iron and other unavoidable impurities. Using the method of the present application, high-efficiency continuous pickling is realized, and the surface color is consistent, which meets the high surface quality requirements of high-end fields for steel plates.