reduction of area at fracture
试样断口收缩率 notch ductility
断裂口收缩率 contraction at fracture
并根据连铸机现状水平，采取优化辊缝收缩方案、加强二冷系统和扇形段的管理，使得高强船板断口合格率稳定在97%左右。
The rate of nomal fracture is keeped about 97% by optimizing roll gap shrinkage and strengthening management of second cooling and Fan-paragraph, according to now level of casting machine.
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