H-shaped steel manufacturing method

Abstract

To provide an H-shaped steel manufacturing method that can reduce variation in a longer direction of a flange width of a flange of an H-shaped steel after finish rolling by devising a rough processing process with a rough rolling machine.SOLUTION: A rough rolling process in an H-shaped steel manufacturing method includes a sizing rolling process in which a web part S1W of an H-shaped steel blank S1 is rolled in a thickness direction and a flange part S1F of the H-shaped steel blank S1 is rolled in a width direction by using a caliber 33 for sizing rolling. The caliber 33 for sizing rolling has a depth b1 shorter than a flange leg length S0 of the flange part S1F of the H-shaped steel blank S1. A groove part 33a for rolling the flange part S1F is formed in a peripheral surface of each of an upper rolling roll 31 and a lower rolling roll 32. At a first pass in the sizing rolling process, rolling for depressing only the flange part S1F of the H-shaped steel blank S1 is performed by using the caliber 33 for sizing rolling.SELECTED DRAWING: Figure 3

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