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Jiannanzhuang Industrial Zone, Jiyuan City, Henan Province, ChinaJiyuan City, Henan ProvinceChina, 454650Web Page Link: http://www.toboc.com/jiyuantianhespecialsteelcoltd
The drill collar is used between the drill pipe and the bit in the drill stem. It is used to put weight on the bit so that the bit can drill. Drill collars are made of AISI 4145H or 4145H modified alloy steel. Its bores are trepanned from one direction with no mismatch. All drill collars are Q&T overall length.
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Jiyuan Tianhe Special Steel Co., Ltd