这是个难以控制，高精度要求的工序，同时在原材料上的微小缺陷，或者没有将不同的层排列在一条直线上，这都会导致一个批次中的20%或者更多的产品成为废料。
This is a fractious, finicky process and tiny defects in the materials, or failures in the alignment of the different layers, can result in 20% or more of a batch being scrapped.
我们应该找出造成不合格产品的原因：是由于设计缺陷还是原材料不合格，还是在生产或运输过程中出了问题？
We should find out what has caused the defect: Is it caused by faulty design or substandard material supplied, or has something gone wrong in production or in the course of transportation?
这种类型的缺陷形成的热轧过程的原材料。
This type of defect is formed during the hot rolling process of the raw material.
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