There are a lot of machinery products all natural products, but why would drill, hob, anti-driller put together and this is called the Three Musketeers, mainly based on the company's brand, "Jianfei," which is the company's three products focus on the production of three product lines, such as anti-driller is now widely used in coal, mining, hydropower, roads, bridges, metallurgical, chemical and so on occasion, in the case of this series of engineering, product quality has also been The company's most important point. These products in many special occasions for different applications, these products have been continuously improving production with, and through a series of quality system to ensure the quality of the products of these three rock hollow steel drill rod, so The attention of the community. These products are in the process of development of the company in the past few years rock drill rod, in technical terms, but also from the mechanical technology strongman ask around in the continuous reform and innovation, drill, hob, anti-driller therefore constantly in progress to meet the needs of various industries to ensure that the drill pipe, hob, inverted driller quality products from raw materials to the factory in this series of strict procedures. Through this rigorous quality control hollow steel, and let this trio of product quality has been recognized by the community, which also has been pursued by the company's philosophy, which guarantee Jianfei farther and farther. 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), 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 | Zibo Peng Rui Metal Products Co., Ltd. (certified) | hollow steel by Zibo Peng Rui metal Products Limited. Zibo Peng Rui Metal Products Co., Ltd. (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. Zibo Peng Rui Metal Products Co. led the staff warmly welcome all inquiries negotiations to create Zibo Peng Rui Metal Products Co. a better future.