Custom heat-treated BQ NQ HQ PQ NWJ Drill Pipe Casing For Mining ,
1. With highly and strength of resistance on the bending, welding
2. Highly efficiency on production and steady quality
3. It able to keep the hole straight and with long use time.
"Q" Series: BQ, NQ, HQ, and PQ.
"WJ" Design: AWJ, BWJ, NWJ, KWJ, HWJ
"W" Design: RW, EW, AW, BW, NW, HW
Metric Series: 33, 42, 50
We also can produce various sizes of casing tubes
"W" Design: RW,EW,AW,BW,NW,HW,PW,SW,UW,ZW/HWT,PWT
Metric Series: 46, 56,66,76,86,101,116,131,146
"X" Design: RX, EX, AX, BX, NX, HX, PX, SX, UX, ZX
All Chinese sizes.
We choose the best steel tubes in the market to manufacture our
drill rods and pipes. Spot check will be conducted after the steel
tubes delivered to company. We will make sure the compositions and
specifications match the inspection report form the suppliers.
Based on the depth of drill bore, Q series wireline core drill rods
are classified into A and B grades. A grade drill rod is
entire-length or ends thermal processed and B grade drill rod is
Material:30CrMnSiA or 45MnMoB(A grade), XJY850 or BG850( B grade)
Heat treatment control:
Heat treatment will greatly improve the material strength and
increase the thread wear life of the
rods and casings. We conduct either tru-wall or both ends heat
treatment to the tube body. After
heat treatment, strength, hardness, straightness and concentricity
of the treated tubes will be tested
in our lab.
Thread opening process:
Accuracy of threads will determine the use effects and life time of
drill rod and casings.
CNC latches and form cutter are used in thread opening processing
to minimize error made by
Additional thread treatment:
Surface of the threads will be cleaned to remove burr adhered after
threads are opened.
Afterwards, the tread surface will be phosphated to improve surface