Geological drilling pipes
- Outer diameter: Φ33mm~Φ127mm
- Wall thickness: 5.0mm~10.0mm
- Length: 6.0m~12.0m
- Grades: ZT380、ZT 490、ZT 520、ZT 540、ZT 590、ZT 640、ZT 740
Drill pipe is a component connecting the drilling machine and the drill bit, transmitting the power to break the rock in the hole and transporting rinse agent.
Standards:
GB/T 9808-2008 : Seamless Steel Tubes for Drilling
JIS G 3465-2006 : Seamless Steel Tubes for Drilling
GB/T 16950-2014 : Geological Core Drilling Tools
Mechanical properties:
Grade | Yield strength (Rp0.2/MPa) | Tensile strength (Rm/MPa) | Elongation A/% |
ZT380 | ≥380 | ≥640 | ≥14 |
ZT490 | ≥490 | ≥690 | ≥12 |
ZT520 | ≥520a | ≥780 | ≥15b |
ZT540 | ≥540 | ≥740 | ≥12 |
ZT590 | ≥590 | ≥770 | ≥12 |
ZT640 | ≥640 | ≥790 | ≥12 |
ZT740 | ≥740 | ≥840 | ≥10 |
Remarks: 1. Yield strength of Grade ZT520 is measured by Rp0.5 . 2. Tensile specimens of Grade ZT520 adopt S4, S5 or S6 according to GB/T228. | |||
Outer diameter tolerance: -0.5%D~+1.0%D
Wall thickness tolerance: -10%S~+12.5%S
Straightness: ≤1.0~1.3mm/m
Environment applied:
It can be applied to the environment with corrosive medium (such as H2S, CO2, etc.)