Rolling method of deformed bar steel and roll for deformed bar steel

摘要

The final finish rolling is performed by a two-roll mill to obtain a deformed bar having the nod 12 and the four ribs 4 formed therein.;A roll used in a final finishing two-roll mill (R_One), (R₂Has a circumferential groove (3), a node groove (2) and a bottom groove (1).;The circumferential groove 3 has a substantially semicircular cross section and is formed on the circumferential surface of the roller over the entire circumferential direction.;The nodal groove 2 is formed in the groove surface of the circumferential groove 3 to have a predetermined width so as to intersect the circumferential groove 3.;The bottom groove 1 is formed in a trapezoidal shape in cross section and is formed over the entire circumferential direction at the central portion in the groove width direction of the circumferential groove 3.