Patent ID: 9056343
Filing Date: 2015-06-16
Classification: B21B

Abstract:
1. A cold-rolling process for preventing fracture of high-silicon strip steel having a thickness of less than 0.3 millimeters and having a Si content ≧2.3 wt. %, the process comprising: at the beginning of the cold-rolling process, the temperature of inlet strip steel is above 45° C.; during the cold-rolling process, an emulsion liquid is sputtered to the strip steel, a flow rate of the emulsion liquid is 3500 L/min at the inlet in a rolling direction, a flow rate of the emulsion liquid is 1500-4000 L/min at an outlet in the rolling direction, and the temperature of the strip steel is maintained above 45° C. under the precondition to guarantee technological lubrication; for a first pass of rolling, a reduction ratio is 20-40%, a rearward unit tension is 8-30 N/mm for middle passes of rolling, the reduction ratios are 18-38%, a rearward unit tension is 40-150 N/mm for a finish pass of rolling, a reduction ratio is 15-35%, a rearward unit tension is 60-300 N/mm