Method for continuous pickling of double-phase stainless steel coil
A technology of duplex stainless steel and austenitic stainless steel, which is applied in the field of continuous pickling of duplex stainless steel coils, can solve the problems of blackened steel coil surface, easy overburning, poor color and other problems, and achieve the effect of high gloss
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[0016] What the present embodiment is pickled is the 022Cr22Ni5Mo3N duplex stainless steel coil after the 10.0mm hot-rolled annealing, and it is the following successive steps:
[0017] (1) The front end and the rear end of the 022Cr22Ni5Mo3N duplex stainless steel coil after hot rolling and annealing before pickling are each connected to a 200m-long high-Cr and high-Ni 06Cr25Ni20 austenitic stainless steel coil of the same thickness;
[0018] (2) The shot blasting of the steel coil before pickling adopts a low speed, and the speed of the throwing head is 1750 rpm;
[0019] (3) Pass the annealed steel coil through the chemical pretreatment section, the medium is H 2 SO 4 , the acid concentration is 350g / l, the pickling temperature is 90°C, the iron ion concentration is 10g / l, the pickling catalysts added are NaCl and hydrogen peroxide, the NaCl concentration is 60g / l, the hydrogen peroxide concentration is 20g / l, the pickling speed 10m / min;
[0020] (4) Then pass the steel ...
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