DCDMA Standard Drill Rods 50 60 70mm Drill Bit For Conventional
Core Barrel Drilling
DCDMA Standard Ø55.6*4.8 Drill Bit Extension Bar
Drill Bit Extension Bar Raw Materials:
ROSCHEN 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
entire-length processed.
Material: 30CrMnSiA or 45MnMoB (A grade), XJY850, BG850(B grade),
RS950, Eruopean/US Standard 40/41
Drill Bit Extension Bar Specifications:
1. High Quality Alloy Tube
2. Through Wall heat treated tube body
3. Consistent concentricity, straightness
4. DCDMA Standard thread
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 anthropic factors.
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
conditions.
Wireline core drill rod technical parameters:
DCDMA Drill Rods Tapered threads Wireline Drill Rod BQ NQ HQ PQ for
mining industry
| Standard | Specification | Body Size | Length(M) | Thickness of The End | Bit Standard |
| B | BQA BQB | Ø55.6*4.8 | 3 | / | BQ |
| BRQ | Ø55.6*4.8 | 3 | / | BQ |
| BQT | Ø56.5*4.75/6 | 3 | Internal Thicken | BQ |
| BQS | Ø54*4.5/6.25 | 3 | Inside & Outside Thicken | BQS |
| N | NQA NQB | Ø71*5.5(Ø70.1*5.05) | 3 | / | NQ |
| NRQ | Ø71*5.5(Ø70.1*5.05) | 3 | / | NQ |
| NQT | Ø72*4.8/6 | 3 | Internal Thicken | NQ+1 |
| NQS | Ø73*5/7.5 | 3 | Internal Thicken | NQ+1.5 |
| H | HQR HQB | Ø89*5.6 | 3 | / | HQ |
| HRQ | Ø89*5.6 | 3 | / | HQ |
| HQT | Ø91*5.8/6.75 | 3 | Internal Thicken | HQ+1 |
| HQS | Ø91*5.8/7.5 | 3 | Inside & Outside Thicken | HQ+1 |
| P | PQA PQB | Ø114.3*6.35 | 3 | / | PQ |
| PRQ | Ø114.3*6.35 | 3 | / | PQ |
ROSCHEN can supply the following products:
1) Drill rod: BQ, NQ, HQ, PQ
Casing tube: BW, NW, HW, PW, HWT, PWT
2) Bit: impregnated diamond bits, tri-tube core barrel, PDC diamond
bit
3) Reaming shell: BQ NQ HQ PQ series
4) Core barrel: BQ, NQ, HQ, PQ head assembly and parts and overshot
assembly
5) Drill tool: lifting tool, wrench, adapter sub, hoisting plug,
water swivel, overshot, outer tube & inner tube wrench, foot clamp,
recovery tap, etc.
Pictures
