In this paper, the girth welding was carried out after two kinds of oil pipeline steel with different content of V and Cr were heat treated by the different specification.
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研究了具有不同合金元素钒和铬的两种石油用钢管 ,在对其经过不同热处理后进行环缝焊接。
单词 In this paper, the girth welding was carried out after two kinds of oil pipeline steel with different content of V and Cr were heat treated by the different specification. 的词典定义。@海词词典-最好的学习型词典
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