| 摘要 |
PURPOSE:To improve descaling capability by cold rolling a hot-rolled steel sheet with scale,stuck to its surface, under proper conditions to produce cracks in the scale, before descaling the sheet by chemical or physical means. CONSTITUTION:A stock 2 of hot rolled steel sheet with scale stuck to its surface, is cold rolled by work rolls 1 to produce cracks in the scale, before descaling the stock 2 by chemical or physical means, such as pickling or brushing. Then the stock 2 is cold rolled under the conditions that the relation, between the diam. of roll 1 and a draft % = (h0-h1)/h0X100 satisfies roll diam. mm<=75X draft %. In this way, the cracks are effectively produced in the scale, and a pickling time is remarkably produced, or the stock 2 is descaled by brushing, etc. by eliminating the pickling.
|
