The result showed that the cracking was caused by the fold-ing and nonmetallic inclusions of steel pipe. 结果表明,钢管中存在折叠及较严重非金属夹杂物是导致开裂的主要原因。
The using data from detected non-metallic inclusions to estimate the status of undetected inclusions is a speculation in the theory of method, which has just reference value. 由已检非金属夹杂物中所得到的数据判断其他未检夹杂物的状态,在方法学上属于推测,仅具有参考意义。