Threaded Rod must have high fatigue strength, elasticity, rigidity and toughness hydraulic drill rod material, but the strength and toughness is conflicting. Threaded rod Rod, is a slender rod, heat treatment is not suitable for complex, integrated performance can only get 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 of hollow steel, therefore, require high surface hardness wear-threaded parts, the center has enough toughness to prevent breakage. It is well known properties of materials, often after heat treatment in order to give full play to their maximum potential, therefore, 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 content V or adjust hollow drill steel drill rod, heat treatment process is used when a hollow rolled steel controlled cooling to ensure the rod hardness; threaded parts of quenching after induction hardening, resulting in 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, but generally only for D45, D51, D38 Arbors also used a small amount of drill rod. 2 Threaded Rod material of choice for domestic Threaded Rod heat treatment process and performance characteristics of the domestic φ32 × 1 200 mm of extension rods Rod, most using 35SiMnMoV steel and gas carburizing process. 105 kW domestic gas carburizing furnace can handle 1 200 mm long rod. Due to the high carbon content 35SiMnMoV steel, carburizing + quenching and tempering, low ductility and drill rod and life is not high. Carburizing + isothermal tempering can improve core part of tough plastic, but the surface hardness of the nitrided layer is not high, the thread wear is reduced. Therefore, the only choice is the carbon content of 0.23% of the alloy hollow steel, will it be possible to improve the life of the drill rod, short thread. B28, B32, B35, D38, D45, D51 standard threaded drill rod, the vast majority of a length greater than 1 200 mm, the absence of deep gas carburizing furnace, can not use gas carburizing + quenching and tempering processes. Some manufacturers have tried to replace the whole local carburizing carburizing liquid carburizing. However, the presence of liquid carburizing illiquid bath, bath surface slagging hole clogging heart defects, the implementation of the process in mass production very difficult. So, now made in the above series of drill rod, multi-use 35SiMnMoV, Z708 or 30CrNi3Mo steel, no large-scale deep carburizing furnace can only be used in quenching and tempering or isothermal quenching process. Such process due to the high carbon content of steel in lieu of carburizing, quenching only hexagonal hollow steel, surface hardness is not high, the threaded portion of poor wear resistance. So Rod has been unable to get a high level of life. There are deep gas carburizing furnace brazing with plant equipment for its poor (such as carburizing no overall control after cooling means), produced after straightening bent difficult overall carburizing, therefore, the level of domestic heat brazing rod thread Compared with foreign advanced level there is still a wide gap. Hexagonal 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!