The company's products are of international standards (ISO standard) design, manufacturing, product quality Habitat leading domestic level, leading product quality to meet international advanced level. The company has always focused on the scientific enterprise, standardization and institutionalization of management, in 2008 passed the ISO9001: 2008 quality system certification standard hydraulic drill rod hollow steel, effectively ensure the sustained and stable product quality. In addition, in the production process of hollow steel, we have adopted advanced production equipment and production technology, high-quality raw materials to ensure good quality of our products consistently. After years of unremitting efforts, we have the independent design and development of new products, the ability to use a hollow drill steel drill rods, forming a strict quality control system and perfect after-sales service, which allows us to effectively reduce the potential pitfalls of products and so that our quality of service and customer satisfaction to obtain greatly improved. We will continue to collect end-user adoption of practical usage and feedback on products, timely improved to enhance the company's R & D capability. Mai Rod analyze the failure of heavy steel hollow drill rod, found 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 bar _ Shandong Rock Drilling Drilling Peng Rui Technology Limited (Certified) _ hollow steel from Shandong Peng Rui Drilling 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.