使钢产生热脆性，降低钢的延展性和韧性，在锻造和轧制时形成裂纹。
Causes the steel to produce the hot brittleness, reduces the steel the ductility and the toughness, when forging and rolling crack.
裂纹面上有大量气泡，沿轧制方向呈簇状分布。
On the crack face, a great deal of bulbs is distributed like cluster along the rolling direction.
某轧钢厂正常轧制的钢材表面存在裂纹缺陷。
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