COLD ROLLING METHOD OF THIN STEEL STRIP

摘要

PURPOSE:To roll a thin strip of a carbon steel having an excellent surface characteristic at a high speed without heat scratching by coating the surface of work rolls with a high-hardness high-heat-conductivity material, high-melting non- solid soln. material, etc. and using a rolling mill oil having excellent mill cleaning property. CONSTITUTION:Any among the high-hardness high-melting material having >=900 Hv hardness and >=1,500 deg.C m.p. high-harness high-heat-conductivity material having >=900 hardness and >=0.15Cal/sec. deg.Ccm heat conductivity at 20 deg.C and the high-melting non-solid soln. material or high-melting high-heat conductivity material having >=2,000 deg.C m.p. is used to coat the surface of work rolls for cold rolling of the thin steel strip. The steel strip is cold rolled by using such work rolls and the rolling mill oil consisting essentially of mineral oil and synthetic oil having excellent mill cleaning property. The seizure of the rolling material and the work rolls is prevented by such method. The thin steel strip having high quality is thus produced at a high speed and high yield by high-draft rolling.