Method of and apparatus for effecting a thickness-reduction rolling of a hot thin plate material

A method of effecting a thickness-reduction rolling of a hot thin plate material, comprising the steps of:

• drawing a hot thin plate material manufactured by a continuous casting machine out of the continuous casting machine is hot state;
• performing a widthwise rolling of said hot thin plate material in the direction of width thereof thereby applying a compressive strain to a scale formed on the surface of said hot thin plate material and thus forming cracks in the scale, and performing a bending work of said hot thin plate material in the longitudinal direction thereof thereby applying a bending strain to said scale on the surface of said thin plate material for thus fining said cracks;
• exfoliating said scale having said cracks by a fluid means or a mechanical means;
• and
• thereafter, by a rolling mill, effecting a thickness-reduction rolling of said hot thin plate material from which said scale has been exfoliated.

An apparatus for effecting a thickness-reduction rolling of a hot thin plate ingot provided with a continuous casting machine and a rolling mil, comprising:

• a widthwise rolling mill disposed between said continuous casting machine and said rolling mill for effecting a thickness-reduction rolling of a thin plate ingot, said widthwise rolling mill being adapted to perform a width-reduction rolling of a hot thin plate ingot continuously manufactured by said continuous casting machine thereby applying a widthwise compressive strain to scale formed on the surface of said hot thin plate ingot;
• and
• means for performing a bending work of said hot thin plate ingot in the longitudinal direction thereof for fining said scale formed on the surface of said thin plate ingot;
• means for exfoliating said scale from said thin plate ingot;
• and
• rolling mill means for effecting a thickness-reduction rolling of said hot thin plate ingot rom which said scale has been thus removed.

An apparatus for effecting a thickness-reduction rolling of a hot thin plate material provided with a rolling mill for rolling a hot thin plate material, comprising:

• a continuous casting machine for continuously manufacturing a hot thin plate material directly from a melt;
• widthwise rolling mill means disposed downstream of said continuous casting machine and upstream of said rolling mill for performing a width-reduction rolling of a hot thin plate material and for applying a widthwise compressive strain to a scale formed on the surface of said hot thin plate material;
• and
• means for performing a bending work of said hot thin plate material in the longitudinal direction thereof and for forming fine cracks in said scale formed on the surface of said thin plate material;
• exfoliating means for removing said scale from said thin plate material;
• and
• said rolling mill effecting a thickness-reduction rolling of said hot thin plate material from which said scale has been thus removed.