The defects in the cold rolling roll detected by ultrasonic flaw detector are mainly the cracking defects, the non-metallic inclusions plays an important role for producing the cracking defects.

冷轧辊坯超声波探伤超标的主要原因是裂纹性缺陷，非金属夹杂物对裂纹性缺陷的产生起到了重要的作用。

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So, it is very important to solve this problem of providing raw material (large-specification roll of steel plates) for cold-rolling mill.

因此，如何解决攀钢冷轧板厂用原料(大直径热轧板卷)的铁路运输问题就成了当务之急。

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The principal problems with respect to roll working life are cracking at the surface of roll for hot-rolling and that effective zone of quench-hardening of roll for cold-rolling is too narrow.

热轧工作辊的裂纹损坏和冷轧工作辊有效淬硬层过浅是两大突出问题。

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