DRILL COLLAR API SPEC 7-1: 89 105 121 146 159 165 178 203 It's made from rolled or forged AISI4145H chrome-molybdenum steel
DRILL COLLAR API SPEC 7-1:
it's made from rolled or forged AISI4145H chrome-molybdenum steel.
The content of chemical composition and microelement is controlled effectively throughout the whole process. According to its different figures and materials, it can be divides into three types:
Type A (columnar): made from ordinary alloy steel, both inside and outside of the cross section of the pipe are cycloidal.
Type B (spiral): made from ordinary alloy steel, with a spiral chute on the outer surface of the pipe
Type C (non-magnetic): made from stainless alloy-steel of low magnetic permeability, both inside and outside of the cross section of the pipe are rounded.
If you want to communicate for the drill collar,please send enquriy to me or contact me on the trade manager.
My trade manager id is: cn200852287
Thanks and best regards,
Mr Albion
Sales Manager
Dongying Haixin Petroleum Equipment Co.,ltd
drill collar
