(3) good corrosion resistance. Currently, when Arbors Rod drilling operations in the open air, the use of orifice catching dust dry drilling, while the underground operations, wet drilling. Drill Rod majority wet drilling. Interaction rock drill rod drill rod threaded bore by the high frequency of high stress and water (often with acidic water) corrosion, which is a major factor in causing fatigue fracture in the drill rod, so the thread Rod must have good waterproof corrosion. (4) high flatness and rigidity. Flatness and rigidity threaded drill rod is an important guarantee for obtaining high drilling efficiency. When drilling, drill rod to work in rotating state 250 r / min, if the flatness is low or insufficient rigidity, drill rod will work under the eccentric strike, while the loss of a part of the rock energy, on the other hand produced a bending stress, increases the chances of drill rod fatigue failure. Rod higher flatness, rigidity better, pass the higher the efficiency of drilling stress, the faster drilling. (5) good structural design. Threaded Rod is to pass a high-frequency high stress rods, sections can cause changes in component stress and stress concentration, the greater the change in cross-section with a hollow drill steel drill rod, the lower the efficiency of stress transfer, and the damage was greater the stress . Therefore, the design principles of good drill rod structure is: try to avoid or reduce the drastic change of hollow steel sections, using reasonable and slow changes in the transition section of heavy steel hollow drill rod, choose the largest possible transition arc. Of course, higher precision, namely to improve the neutral and screwed interchangeability between the center of the different sections, with the gap decreases, reducing the roughness of the machined surface, etc., are beneficial to improve the life of the drill rod failure brazing rod analysis found that life and hardness of heart related. In ensuring the whole cross-section of the entire drill rod hardenability (ie core part full martensite), the toughness and hardness of the drill rod has a direct relationship. Hardness depends on the chemical composition of the steel, wherein the carbon content play a decisive role. With the increase of carbon content, i.e., drill rod hardness increased strength and improved toughness. FF-710 steel, we use the carbon content of 0.24% to 0.30%, quenching and tempering hardness HRC46 ~ 52 hexagonal hollow steel | Drilling Ltd. Shandong Peng Rui (certified) | hollow steel chisel Peng Rui from Shandong Rock Technology Limited. Drilling Ltd. Shandong Peng Rui (www.zbpengrui.com) Shandong Zibo, metal cutting class leader, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. Shandong Peng Rui Drilling Ltd. led the staff warmly welcome all inquiries negotiations to create Shandong Peng Rui Drilling Ltd. a better future.