| 摘要 |
PURPOSE:To improve the mechanical properties and obtain cold rolled steel sheets of corrected shape, by rolling with cooling lubricant in the final stand by using direct application system, and then temper-rolling under wet type system in the single stand. CONSTITUTION:A strip S uncoiled from a strip coil 6 is cold-rolled in a cold rolling mill consisting of stands No.1-6. In this case, the strip is rolled in the conventional direct application system from stands No.1-No.5, and before entering the final stand No.6, the water content on the surface of the strip S is squeezed off by means of a wringer roll 2. Then, the strip yet having a slight excess water content is supplied to the stand No.6, and is rolled by injecting cooling lubricant from a header 5. As a result, a cold rolled steet of beautiful surface may be obtained. Next, this cold rolled steel sheet is wet-rolled in the single stand, so that a cold rolled steel sheet for surface treatment with improved mechanical properties, corrected shape and beautiful surface may be obtained. |
