A section of pipe, which is connected to the upper part of the drill bit to contain and protect the core.
The main materials or grades
ZT380、ZT 490、ZT 520、ZT 540、ZT 590、ZT 640、ZT 740。
Executive standard
GB/T 9808-2008《Seamless steel pipe for drilling》
JIS G 3465-2006《Seamless steel pipe for drilling》
GB/T 16950-2014《Geological core drilling tool》
Product feature
Mechanical property
Dimensional accuracy
OD tolerance：-0.5%D~+1.0%D，WT tolerance：-10%S~+12.5%S，Straightness：≤1.0~1.3mm/m
Service environment
This product is mainly used for transmitting drilling power and transporting mud which should have good strength, ductility, tenacity, high wear-resisting, anti-fatigue reverse and corrosion resistance.
