PURPOSE: To obtain a hot rolled steel strip while preventing the defective bite of the front end of a rolling material, slip, etc. by rolling the rolling stock at a high draft via guides for preventing buckling between a push roll constituting body for rolling on an inlet side and a multiple high-draft roll constituting body on an outlet side.
CONSTITUTION: A thin slab 2 having about 30W40mm thickness in rolled in one pass at ≥45% draft by the push rolls 6a, 6b for rolling. The rolling stock 2 after rolling is passed through the roller guides 10a, 10b for preventing buckling and is then loaded continously with compressive force (push force) of 0.1W0.9 times the stress of the stock 2 and is rolled in one pass at≥60% draft by the multiple high-draft roll constituting body 7 having small-diameter work rolls 8a, 8b on the outlet side, by which the hot rolled steel strip having 4W5mm thickness is obtd. The above-described stability and instability is thus solved and the rolling torque of the multiple high-draft roll constituting body reduced, by which the generation of the slip between the rolls of said constituting body is prevented.
KOUNO TERUO
SHIBAHARA TAKASHI
