The outer portions of the float shoe are made of steel and generally match the casing size and threads, although not necessarily the casing grade.
浮鞋的外壁由钢制成，且一般与套管的尺寸和丝扣匹配，然而浮鞋的钢级不一定要与套管钢级一致。
The outer portions of the guide shoe are made from steel, generally matching the casing in size and threads, if not steel grade.
引鞋的外部由钢制成，一般与套管的尺寸和螺纹匹配，如果钢级不匹配的话。
Through researching N80Q steel kind and the heat treatment technology, we have successfully developed and produced N80Q grade oil casing which meets the API standard and the user's requirement.
包钢通过对n 80 Q钢种和热处理工艺的研究，成功地开发生产了性能满足标准要求和用户需要的N80 Q钢级石油套管。
Purpose: wire wound resistor in ceramic casing is used in circuit of automatic control system, frequency conversion control system, power supply, top grade acoustics.
用途：陶瓷绕线电阻主要用于自动化控制系统，变频控制系统，电源设备，高档音响等电路中。
The application tests of double - grade cement injection casing ln the thirty deep holes were done, and associated technical problems are introduced.
介绍了新疆石油管理局钻井公司自行设计加工的双级注水泥接箍在三十多口深井的试验和使用情况；并阐述其相关的技术问题。
The application tests of double - grade cement injection casing ln the thirty deep holes were done, and associated technical problems are introduced.
介绍了新疆石油管理局钻井公司自行设计加工的双级注水泥接箍在三十多口深井的试验和使用情况；并阐述其相关的技术问题。
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