Production method for continuous pickling of hot rolled duplex stainless strip steel
A technology of duplex stainless steel and production method, which is used in grinding machines, grinding/polishing equipment, manufacturing tools, etc., can solve the problems of slow pickling speed, not very good, and the surface quality of strip steel is not very good, so as to improve the output , Improve the effect of pickling speed
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[0036] A more optimized implementation of the technical solution of the present invention is as follows:
[0037] More optimally, step 1) The shot blasting machine has a projection volume of 975-1025kg / min, and the shot blasting machine speed is 2075-2125rpm.
[0038] More optimally, step 2) Electrolytic pickling and pre-pickling H 2 SO 4 The concentration is 280~320g / L, the pickling temperature is 78~82℃, the metal ion concentration is 40~60g / L, and catalyst H is added to the solution 2 O 2 , The concentration is 20-30g / L, the current is 1400-1600A, and the pickling speed is 18-22m / min.
[0039] More optimally, step 3) the speed of the grinding and scrubbing motor is 900-1100rpm, and the motor current is 315-325A.
[0040] More optimally, step 4) H in the sulfuric acid pickling tank 2 SO 4 The concentration is 240~260g / L, the pickling temperature is 83~87℃, the metal ion concentration is 45~55g / L, and the pickling speed is 18~22m / min.
[0041] More optimally, step 5) The concentration ...
Example Embodiment
[0043] Example 1
[0044] The annealed steel strip was shot blasted and descaled, the shot blasting machine projection amount was 975kg / min, and the shot blasting machine speed was 2075rpm.
[0045] Strip steel after shot blasting descaling is pre-pickled with sulfuric acid electrolytic pickling, where H 2 SO 4 The concentration is 280g / L, the pickling temperature is 78℃, the metal ion concentration is 40g / L, and catalyst H is added to the solution 2 O 2 , The concentration is 20g / L, the current is 1400A, and the pickling speed is 18m / min.
[0046] After sulphuric acid electrolytic pickling, grinding and brushing are carried out. The motor speed is 900rpm and the motor current is 315A.
[0047] After grinding and brushing, the strip passes through a sulfuric acid pickling tank, where H 2 SO 4 The concentration is 240g / L, the pickling temperature is 83°C, the metal ion concentration is 45g / L, and the pickling speed is 18m / min.
[0048] After sulfuric acid pickling, the strip passes throu...
Example Embodiment
[0051] Example 2
[0052] The annealed steel strip was shot blasted and descaled, the shot blasting machine projection amount was 1025kg / min, and the shot blasting machine speed was 2125rpm.
[0053] Strip steel after shot blasting descaling is pre-pickled with sulfuric acid electrolytic pickling, where H 2 SO 4 The concentration is 320g / L, the pickling temperature is 82℃, the metal ion concentration is 60g / L, and catalyst H is added to the solution 2 O 2 , The concentration is 30g / L, the current is 1600A, and the pickling speed is 22m / min.
[0054] After sulfuric acid electrolytic pickling, grinding and scrubbing are carried out. The motor speed is 1100rpm and the motor current is 325A.
[0055] After grinding and brushing, the strip passes through a sulfuric acid pickling tank, where H 2 SO 4 The concentration is 260g / L, the pickling temperature is 87°C, the metal ion concentration is 55g / L, and the pickling speed is 22m / min.
[0056] After sulfuric acid pickling, the strip passes thr...
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