プレス用冷延鋼板の連続焼鈍熱サイクルについて

概要

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A continuous annealing heat cycle is established for the drawing quality cold rolled low-carbon capped steel strip. The heat cycle is composed of the recrystallization treatment, rapid cooling incorporating water quenching, and subsequent over-aging treatment. Sufficient over-aging can be realized in less than 1 min by virtue of the rapid cooling, in contrast to the past results in which over-aging times of 30 min∿1 hr were employed. The main feature of the heat cycle is as follows : recrystallization treatment at 700° to 720℃ for 40 sec ; water quenching from around 600℃ ; over-aging treatment at 350°∿450℃ for 60 sec. The recrystallization in the above temperature range results in the reasonably large ferrite grains without the presence of the pearlite colonies. The water quenching from around 600℃ is essential to balance the beneficial effect of the decrease in solute carbon against the adverse effect of the increase in the fine carbide precipitates. The over-aging treatment in the above temperature range is beneficial to achieve the efficient overaging under a reasonably low solubility of the interstitial carbon. Prolongation of the recrystallization or over-aging treatments does not show any substantial effect.
社団法人日本鉄鋼協会の論文
1976-05-01