PRODUCTION OF CHANNEL STEEL

摘要

PURPOSE:To produce inexpensively a channel steel having good quality at high productivity by hot rolling a blank rolling material by means of plural sets of rolling rolls formed with calibers to form inclined flange parts on the outside and a projecting web part then subjecting the blank material to cold forming. CONSTITUTION:A billet 1 heated to a prescribed temp. is rolled by plural sets of rolling rolls which are disposed in parallel with each other, are rotated on at least either thereof by driving devices and are formed with prescribed calibers to form successively the flange parts and the web part. An intermediate product 2 having the W-shaped cross section consisting of a pair of the flange parts 3 inclined respectively toward the outside with respect to the perpendicular and the web part 4 made into a projecting shape and having the wall thickness of the flange parts 3 and the web part 4 approximately equal to the product size is obtd. The web part of the above-mentioned intermediate product 2 is cold- formed in at least two passes by plural sets of cold forming rolls disposed in parallel with each other, by which the channel steel having the parallel flange parts and the flat web part is obtd.