Key words: Geological rod, Made in China, friction welding drill rod Material of rod body: geological alloy pipe Material of connector: first-class alloy constructional steel Craft: thermal refining in vacuum, which greatly improves the fatigue resistance and shearing strength. Rod body craft: friction welding, which improves the bending strength, the firmness of the drill rod as well as the lifetime. Made-to-order available.

Key words: Prismatic drilling rod, drilling tools, mining tools, This is our patented product, designed and developed by R&D institution and our company. (Patent No.:201020122744.8). Material: medium carbon alloy pipe (rod body); 42Crmo (connector). Craft: high pressure, thermal refining in vacuum, over surplus welding. The craft improves the mechanical capacity and the drilling performance when drill deep hole on complicated stratum. Application: deep hole drilling on soft stratum such as