轧钢机的异常振动是造成钢材表面质量下降的主要原因。
Its abnormal vibrations are main causes leading to falling down of surface qualities.
也称为粉末钢，因为在制造过程中，它被打成粉末状，然后再经高压处理成钢材。
Also known as powder steel, because in the manufacturing process, it is labeled as powder, and then high-pressure processing into steel.
对45钢力学拉伸试验后试样的内部组织结构及断口的全面分析，认为钢中存在较高含量的氢是造成钢材脆性断裂的主要原因。
The internal structure and fracture features in samples 45 steel after tensile testing is perfectly analyzed in this paper.
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