When the K 55 grade oil casing lated thread , the thread flawed.

K55钢级石油套管在车丝的过程中, 出现断扣问题.

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The bevel milling cutter for cutting groove of oil casing - pipes was designed.

设计了用于油气田管道坡口切割的角度铣刀.

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According to the casing service conditions, it is enforced to produce high grade oil casing.

根据套管的服役条件, 高钢级石油套管的生产已是势在必行.

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