| 摘要 |
PURPOSE:To suppress the temp. drop of a hot thin sheet and to permit easily scale removal by subjecting a thin sheet material to width reduction rolling in the transverse direction and bending treatment in the longitudinal direction prior to thickness reduction rolling, then executing the thickness reduction rolling of a rolling material after descaling. CONSTITUTION:A molten metal in a tundish 1 is poured into a belt mold 2 to produce the thin billet 6 of a high temp. The billet 6 passed between bending rollers 52 and unbending rollers 55 is cut by a crop shear 56. The billet 6 past a heat insulating zone 57 is subjected to width reduction rolling by a cross rolling mill 58 and to the bending treatment in the longitudinal direction by a bending device 59. The billet 6 which is generated with cracks in the transverse direction and has the easily strippable scale in the above-mentioned manner is subjected to descaling by a steam jet device then to thickness reduction rolling by rolling mills 60, 61, 62. The temp. drop of the hot thin sheet is thereby suppressed and the scale removal is made easy. |
