Hydraulic Rock Drill open with solder Hydraulic Rock Drill is more open usage of domestic construction sector drilling machines, drilling used in open pit mines, cement industry, hollow steel, stone market, construction and road works quarry, water conservancy and hydropower project, as well as infrastructure construction site. Currently used mostly for each child to walk, arm drilling mechanism, drilling holes for blasting rock to the next, usually shot hole diameter 64mm-102mm, maximum drilling diameter up to 127mm, mostly in the 15-20m range of drilling depth Use D38mm, D45mm, D51mm rod diameter circular Arbors or MF Rod Rod diameter 64mm-12mm ball tooth bit. Rod for failure were analyzed and found life and hardness of heart related. In ensuring the whole cross-section of the entire drill rod hardenability (ie core part full martensite) in the case of a hydraulic drill rod hollow steel, 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 rock drill rod, drill rod that increases the hardness and strength increased toughness. FF-710 steel, we use the carbon content of 0.24% to 0.30%, quenching and tempering hardness HRC46 ~ 52 hollow steel pipe, Shandong Peng Rui Drilling Ltd. (certified), hollow drill steel from Shandong Peng Rui 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.