1.high-quality 2.high- elastic 3.rigid 4.automatically adjustable 5.stable

1. coal mining R780 heavy weight drill pipe/API Drill Pipe with Hard Banding/

coal mining R780 heavy weight drill pipe/API Drill Pipe with Hard Banding  Spiral craft: prestressed wire winding and welding with single strip steel or double strip steel, based on the big torque of geological drill rod. coal mining R780 heavy weight drill pipe/API Drill Pipe with Hard Banding  Material of rod body: geological alloy pipeMaterial of connector: first-class alloy constructional steelcoal mining R780 heavy weight drill pipe/API Drill Pipe with Hard Banding  Craft: thermal refining in vacuum, which greatly improves the fatigue resistance and shearing strength. Rod body craft: friction welding, which improves the bending strength and the firmness of the drill rod.  Production facility: CNC machining equipment, which guarantees the high production efficiency, steady quality and straightness. Design feature: overlay spiral. It guarantees big torque, quick slagging, and clear hole forming. Besides, the drill bit will hardly get stuck. coal mining R780 heavy weight drill pipe/API Drill Pipe with Hard Banding  Application: soft coal bed, and other formation similar to coal bed, which is hard to drain and deslag. Matching: coal mining R780 heavy weight drill pipe/API Drill Pipe with Hard Banding Geological spiral drill rod, diameter not bigger than 73mm: match all kinds of hydraulic driver drill. When drill super soft high pressure coal seam, diameter 90mm, 113mm, 133mm, 146mm will be recommended. It will be more convenient to lay and install core barrel. This kind of drill rod guarantees high efficiency of drilling work, which stops a gap in China.

2. coal mining R780 heavy weight drill pipe/API Drill Pipe with Hard Banding

1.high-quality 2.high- elastic 3.rigid 4.automatically adjustable5.stable

3. coal mining R780 heavy weight drill pipe/API Drill Pipe with Hard Banding

Specifications( mm)			Craft	Connection type with drilling machine
Dia.	Length	Thread type
50-42	500~1500	Taper thread	Friction welding	clamp
63.5-42	500~1500	Taper thread	Friction welding	clamp
63.5-50	500~1500	Taper thread	Friction welding	clamp
73-50	500~1500	Taper thread	Friction welding	clamp
73-63.5	500~1500	Taper thread	Friction welding	clamp
90-63.5	500~1500	Taper thread	Friction welding	Match active drill rod
98-73	500~1500	Hex. Shank	Friction welding	Match active drill rod
110-63.5	500~1500	Taper thread	Friction welding	Match active drill rod
130-63.5	500~1500	Taper thread	Friction welding	Match active drill rod
146-73	500~1500	Taper thread	Friction welding	Match active drill rod

 4. coal mining R780 heavy weight drill pipe/API Drill Pipe with Hard Banding

coal mining R780 heavy weight drill pipe/API Drill Pipe with Hard Banding/