Drill Collar
Date: 01 Jul 2009
Technical Characteristics
1、Drill collar are made of modified alloy steel fully heat treated in order to obtain high hardness
2、Cold rolling processing the thread ends to achieve good pressure-bearing ability, anti wearing out and longer life-span.
3、Thread phosphor or copper coated to achieve good resistant-wearing ability and anti-thread gluing ability.
1、Drill collar are made of modified alloy steel fully heat treated in order to obtain high hardness
2、Cold rolling processing the thread ends to achieve good pressure-bearing ability, anti wearing out and longer life-span.
3、Thread phosphor or copper coated to achieve good resistant-wearing ability and anti-thread gluing ability.
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