HIGH-TENSILE STEEL STRIP HAVING DIFFERENT MECHANICAL PROPERTIES IN WIDTH DIRECTION AND ITS MANUFACTURING METHOD

• Main Authors: KONO OSAMU, DOBASHI KOICHI, HOSHINO TAKEHIRO
• Format: Patent
• Language: English
• Published: 11.11.2004
• Edition: 7
• Subjects: ALLOYS; CHEMISTRY; FERROUS OR NON-FERROUS ALLOYS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS; MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL; METALLURGY; METALLURGY OF IRON; MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; PERFORMING OPERATIONS; PUNCHING METAL; ROLLING OF METAL; TRANSPORTING; TREATMENT OF ALLOYS OR NON-FERROUS METALS

PROBLEM TO BE SOLVED: To provide a high-tensile steel strip having different mechanical properties, especially hole expansion property and stretching property, in the width direction of the steel strip after finish rolling, which are imparted by controlling the temperature of the steel plate in a desired distribution in the width direction of the steel strip at the exit side of the hot-rolled finish rolling machine and to provide its manufacturing method. SOLUTION: The high-tensile steel strip is characterized by the feature that the steel strip having different mechanical properties such as the hole expansion and stretching properties in the width direction of the steel strip is integrally formed by rolling. Further, in the manufacturing method of the steel strip, the different mechanical properties such as the hole expansion and stretching properties in the width direction of the steel strip are imparted by controlling a rising temperature in a desired quantity in the width direction of a rough bar at a finish rolling entrance side or between a finish rolling stands. COPYRIGHT: (C)2005,JPO&NCIPI