| 摘要 |
PURPOSE: A method for manufacturing multi-matrix hot rolled strip is provided to manufacture parts requiring composite characteristics by properly controlling composition and manufacturing process of hot rolled strip, thereby controlling matrix of the hot rolled strip in a strip thickness direction to satisfy mechanical and magnetic properties. CONSTITUTION: The method for manufacturing multi-matrix hot rolled strip is characterized in that the hot rolled strip has a composition comprising 0.0020 wt.% or less of C, 0.20 to 0.30 wt.% of Mn, 0.01 wt.% or less of S, 0.01 to 0.02 wt.% of P, 0.02 wt.% or less of Si, 0.006 wt.% or less of B, 0.01 to 0.02 wt.% of Al, 0.03 wt.% or less of Cr, 0.002 wt.% or less of N and a balance of Fe, a hot rolling starting temperature in the composition range is from 940 to 920 deg.C, thickness of the strip before final rolling is 5 to 7 mm, hot rolling reduction ratio is in the range of 45 to 50%, and cooling rate during rolling is maintained to 800 to 1,100 deg.C/sec.
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