应用显微组织观察，低倍酸蚀，电镜扫描等手段，通过宏观与微观的裂纹对比，分析S355JR带钢表面边缘裂纹主要为板坯角裂引起；指出形成S355JR板坯角裂的主要影响因素，并提出了有效避免措施。
the surface crack on S355JR coil was analyzed by means of fibrous tissue observation, low power and stereoscan photograph. The results showed that: the surface crack created by broken corner of S355JR steel slab, and analyzed the prime reasons of broken corner, and showed how to avoid.
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