熱延-室温巻取による極低炭素 Ti 添加冷延鋼板の機械的性質におよぼす Mn および B の影響

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The effects of titanium, manganese and boron contents are studied on γ-values and tensile properties of very low carbon sheet steel with extra deep drawability, for the purpose of producing cold-rolled sheet steel by a room-temperature coiling process after hot-rolling. The mean γ-value (γ^^-) of the sheet produced by a process skipping coiling treatment after hot-rolling is better than that produced by a conventional coiling process at 700℃, if the soluble titanium/carbon atomic ratio is over 1.5 and the manganese content is less than 0.15%. This is probably due to the enhanced precipitation of Ti (C, N) during hot-rolling and cooling and the suppression of grain growth in hot-rolled sheets. The boron addition deteriorates the γ^^--values of extra-low carbon titanium-killed sheet steels produced by both the conventional coiling and room-temperature coiling processes.
社団法人日本鉄鋼協会の論文
1989-05-01