Threaded Rod must have high fatigue strength, elasticity, rigidity and toughness, and strength and toughness is conflicting. Threaded rod Rod, is a slender rod, heat treatment is not suitable for complex hexagonal hollow steel, overall performance can only get the fatigue strength, elasticity, rigidity and toughness with optimum heat treatment process through. Threaded Rod ends are part of the package solder joins the group, its failure mechanism is fretting wear and impact wear, so the hydraulic drill rod hollow steel, threaded parts require high hardness and wear-resistant surface, the center has enough toughness, prevent breakage. As we all know, the material properties of hollow steel, often heat-treated to give full play to their maximum potential, so the choice of material is often considered together with the heat treatment process. Threaded Rod a foreign material selection Currently, foreign threaded drill rod material summed up in two series. A series is a low-carbon, high-strength, high hardenability, high toughness steel CrNiMo-based system, the carbon content of about 0.25%, Ni content of about 3 percent, the most representative of the steel is 25CrNi3Mo, heat treatment process route is: the overall control of the cooling carburizing → → → threaded portion of the quenching and tempering. After the whole carburizing controlled cooling the rod body to achieve the desired hardness, rigidity and ensure an elastic rod member; subsequent threaded portion quenching, tempering the threaded surfaces to obtain high hardness and high compressive stress to obtain a high fatigue strength and high wear resistance . Most foreign Threaded Rod are using this material and heat treatment process route. Another series is still CrNiMo, but the carbon content of between 0.30% to 0.45%, some countries have increased Cr and Ni V or adjust the content of the heat treatment process is used to control cooling hollow rolled steel, ensuring rod hardness; Threaded parts of quenching after induction hardening to obtain high surface hardness and high compressive stress, but also has high fatigue strength and high wear resistance. This series also has a lot of countries have adopted hollow drill steel drill rod, but generally only for D45, D51, D38 Arbors also used a small amount of drill rod. 2 Threaded Rod material of choice. Mathematical Statistics show that: the life of a low Rod mostly high hardness, and high life of drill rod hardness but low. Rod intensity seen more than enough toughness is the main cause of failure. To solve this problem, we have been used to improve the tempering temperature of methods to reduce hardness of heart, thereby improving heart toughness, but the results were not good. The reason is that FF-710 steel tempering resistance is strong, when the tempering temperature reaches 400 ℃ or more to control the core hardness between HRC42 ~ 46, then drill rod threaded portion of the surface hardness of the carburized layer is significantly reduced, dropped from more than HRC60 HRC55 below, drill rod wear is also greatly reduced, carburizing layer peeling and cracking, leading to early failure of drill rod. Obviously the way to improve the tempering temperature is undesirable. So, we finally gave up FF-710 and the use of lower carbon content of 23CrNi3Mo and 20Cr2Ni4A steel drill rods to trial, after the heat treatment after field use, greatly improve the life of drill rod, especially the latter increase was more circular hollow Steel | hollow steel | Drilling Ltd. Shandong Peng Rui Peng Rui provided by Shandong Drilling Technology Limited. Drilling Ltd. Shandong Peng Rui (www.zbpengrui.com) strong, credible, Shandong Zibo metal cutting and other industries has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Drilling Ltd. Shandong Peng Rui and you hand into the brilliant, for a better future!