PURPOSE: To execute plastic working and heat treatment simultaneously with less consumption of energy by dividing a rolling stage to respective independent two stages and combining an in-line heat treatment stage therewith after the rolling.
CONSTITUTION: A rolling material 1 which is a billet or bloom is heated to about 900°C in a heating furnace 2, after which it is rolled with a roughing mill 3 of V-H type and an intermediate rolling mill 4, whereby primary rolling is accomplished. In the primary rolling, the rolling is exected at about 5,700cm3/sec. mass flow at which the rolling of the steel material maintained at about 865°C± 15°C temp. region corrsponding to deformation resistance is made possible. The rolling material is divided and distributed alternately to coilers 11, 12 with a shear 5 and a traveling distributing machine 7, whereby coils are produced. Thence, the coils are set in uncoilers 21W24, and are heated to about 800°C in a heat holding furnace 8, thence they are subjected to secondary rolling in finishing mills 51W54, following to which they receive heat treatments 61W64 and 71W 74, whereby they are made into products. During the secondary rolling, the temp. controlling by cooling is accomplished, so that the temp. of the materials upon ending of the rolling is the temp. at the start of the heat treatments.
NOGUCHI YUKIO
NAKASHIMA HIROE
ADAKA MATSUO
| JPS5030028A | 1975-03-26 |