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By certification 
Specification:OD20~108mm WT 1.5~20mm
Aplication:Geological core drilling,Water well drilling,Hydrogeology drilling,Engineering geological drilling,Engineering drilling casing material.
Technical features:Innovative system in cold rolling technology in production of seamless steel pipe used in drilling,the compactness of the higher and better toughness,can gretly improve the wear resistance of drillin gipe and resistance torque,make its service life longer.
