COOLING METHOD FOR ROLLED STOCK IN HOT CONTINUOUS ROLLING OF BAR STEEL AND WIRE STOCK

摘要

PURPOSE:To improve the mechanical properties of a rolled stock by cooling a rolled stock with a circular section by passing through an immersing cooling tube and cooling continuously a rolled stock with an oval section by use of an immersing cooling tube and spray nozzles. CONSTITUTION:An intermediate cooling zone 24 is set between an intermediate rolling mill line 22 and a finishing rolling mill line 23 and a later stage cooling zone 25 is set between the mill line 23 and a cooling bed 26. On and after the intermediate rolling mill line 22, a rolled stock is subjected to rollings to alternately form an oval section and a circular section by couples of rolling rolls and to forced cooling. In that time, an oval section stock 19 is cooled by an immersing cooling tube 9 and spray nozzles 15, 16, 17, 18. The stock is uniformly cooled to a proper temp. because the circular section stock is cooled by the cooling tube 9. Therefore, the structure of the stock is uniformized and refined and the mechanical properties of the stock are improved.