So we are talking a lot of steel casing here.
因此我们说道的此项技术需要使用大量钢材。
In the casing surface spray treatment, stainless steel box cover.
机壳表面喷塑处理，不锈钢箱盖。
The LF refining process of oil casing steel at some steel work was investigated.
对国内某钢厂生产石油套管钢的LF精炼工艺进行了研究。
The LF refining process of oil casing steel at some steel work was investigated.
对国内某钢厂生产石油套管钢的LF精炼工艺进行了研究。
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