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。
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