| 摘要 |
PROBLEM TO BE SOLVED: To obtain a bar steel product excellent in surface quality by hot rolling by making formed subscale surely peelable even it is the bar steel of a kind of steel on which thickened subscale is generated in a heating furnace. SOLUTION: While directly supplying water to the bar steel containing alloying elements which are the cause of the generation of the thickened subscale, the bar steel is heated under the following conditions (a)-(b) in the heating furnace and, after that, after performing scale peeling, the bar steel after peeling the scale is hot-rolled. (a) The soaking temperature is >=1,100 deg.C and the soaking time is >=10 min. (b) The soaking temperature is >=1,200 deg.C and the soaking time is >=5 min.
|
