| 摘要 |
PROBLEM TO BE SOLVED: To provide a narrow flange shape manufacturing method capable of consistently manufacturing a narrow flange shape. SOLUTION: When a stock steel slab is rolled nearly in a H-shape to form a roughly rolled steel slab, a web and a flange are reduced in thickness by a universal rolling mill, the flange width is reduced by an edge rolling mill to roll the narrow flange shape in a universal rolling method, the flange leg length and the total reduction distortion of the web and the flange in starting the universal rolling are set to be in a range to satisfy expression of 0.4≤HE<SB>ini</SB>/HE<SB>p</SB>≤1.0, 1.0≤ln(tw<SB>ini</SB>/tw<SB>p</SB>)/ln(tf<SB>ini</SB>/tf<SB>p</SB>)≤1.1, where HE<SB>ini</SB>, tf<SB>ini</SB>and tw<SB>ini</SB>are the flange leg length, the flange thickness and the web thickness in the section of the roughly rolled steel slab when the universal rolling is started, respectively, and HE<SB>p</SB>, tf<SB>p</SB>and tw<SB>p</SB>are the flange leg length, the flange thickness and the web thickness in the product section of the narrow flange shape, respectively. COPYRIGHT: (C)2005,JPO&NCIPI |
