slab surface longitudinal crack 板坯表面纵裂问题
The slab surface crack occurred in the process is analysed, and the improving measures are put forward. The good effects have been obtained.
对生产中出现的表面裂纹进行分析研究，提出改进措施，取得较好的效果。
The results show that the surface longitudinal crack of hot-roll Q345B medium plate is caused by inclusion and surface longitudinal crack of slab.
结果表明，热轧Q 345 B中厚板表面纵裂纹是由于铸坯中存在夹杂物及铸坯纵裂引起的。
The stress required for producing internal crack decreases since there are loci of cracks in the slab caused by the surface crack, so the longitudinal cracks from inner to surface form easily.
由于铸坯表面裂纹形成的裂纹灶，降低了产生内裂所需要的应力值，易于形成内、外相连的纵裂。
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