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HOT-ROLLED STEEL SHEET, COLD-ROLLED STEEL SHEET, AND PLATED STEEL SHEET EACH HAVING EXELLENT UNIFORM DUCTILITY AND LOCAL DUCTILITY IN HIGH-SPEED DEFORMATION
HOT-ROLLED STEEL SHEET, COLD-ROLLED STEEL SHEET, AND PLATED STEEL SHEET EACH HAVING EXELLENT UNIFORM DUCTILITY AND LOCAL DUCTILITY IN HIGH-SPEED DEFORMATION
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机译：热轧钢板，冷轧钢板和平板钢板在高速变形中均具有出色的均匀延性和局部延性
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摘要
The present invention relates to a hot-rolled steel sheet, a cold-rolled steel sheet and a coated steel sheet excellent in uniform ductility and local ductility under high-speed deformation. A two-phase hot-rolled steel sheet according to one aspect of the present invention has a metal structure comprising a main phase composed of ferrite having an average particle diameter of 3.0 μm or less and a second phase containing at least one of martensite, bainite and austenite, in the surface layer portion, a 2.0μm or less and the average grain size of 2, and a 6.0 ~ 10.0GPa car (ΔnH av) the mean value (nH 2nd av) of (nH αav) average value of the nano-hardness of the main phase and the second nano-hardness on the , The difference (ΔσnH) between the standard deviation of the nano hardness of the second phase and the standard deviation of the nano hardness of the main phase is 1.5 GPa or less and the difference in the average of the nano hardness (ΔnH av ) at the center is 3.5 GPa to 6.0 GPa , And the difference (ΔσnH) of the standard deviation of the nano hardness is 1.5 GPa or more.
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