HOT-ROLLED STEEL SHEET, METHOD OF MANUFACTURING THE SAME, AND EQUIPMENT FOR MANUFACTURING THE SAME
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United States of America Patent
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Issued Date -
Jul 2, 2015
app pub date -
Feb 19, 2014
filing date -
Jan 2, 2014
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Abstract
A method of manufacturing a hot-rolled steel sheet is explained. The method includes hot-rolling a slab, performing a first phase transformation process cooling a surface of the hot-rolled slab to phase-transform a structure of a surface portion of the hot-rolled slab, performing a second phase transformation process to phase-transform a structure of a central portion of the hot-rolled slab after the first phase transformation process, and coiling the slab including the phase-transformed surface portion and the phase-transformed central portion.
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