?? Shandong shunxinda Machinery Co., Ltd. (13969559358) is located in Liaocheng Economic Development Zone, Jiangbei water city with beautiful scenery. It is a company specializing in the production, processing and sales of precision seamless pipe, cold drawn precision seamless pipe and cold-rolled precision seamless pipe
Comprehensive mechanical properties of large diameter precision Q345B precision bright tube in stock
With the progress of science and technology, the application scope and space of precision Q345B precision bright tube are gradually expanded, and the disadvantages of traditional material composition and production process are increasingly apparent. At present, there are many studies on the improvement of cold drawn steel pipe drawing process [1-5] and the development of cold drawn thin-walled and high-precision pipe, However, the research on the heat treatment process of cold drawn steel pipe is rarely involved. Jd500q345 is designed by adding a small amount of trace elements. In this paper, through the comparison of different heat treatment processes of jd500, the best treatment process is selected, and excellent comprehensive mechanical properties are obtained. The chemical composition of jd500 and Q345 is shown in Table 1. Test method: the production process of steel pipe is billet normalizing intermediate heat treatment cold drawing heat treatment finished product; The normalizing temperature is 900 ¡æ ¡Á After normalizing, pickling, grinding, removing surface defects and phosphating were used in the intermediate treatment, and the cold drawing was hydraulic forming with mandrel.
The influence of phase transformation on the process parameters of unconstrained quenching and controlled cooling is also needed to keep the precision Q345B precision bright tube in stock. The quenching process not only requires the precision Q345B precision bright tube to obtain good performance. According to the basic principle of elastoplasticity, the internal factors causing deformation of precision Q345B precision bright tube during cooling process are phase transformation, yield stress and thermal conductivity, The inducing factor is uneven cooling. There are many factors that affect the cooling uniformity, such as the actual conditions of the precise Q345B precision bright tube, the water ratio of the upper and lower header, the distribution distance of the longitudinal header and the transverse jet spacing, etc., which have different degrees of influence on the deformation of the precise Q345B precision bright tube, The transverse intensity cooling curve is used to arrange the jet spacing in the width direction of the precision Q345B precision bright tube, that is, the water distribution is symmetrical in the form of convex left and right, which ensures the uniform cooling in the spot width direction of the precision Q345B precision bright tube. In the quenching process, the effect of martensitic transformation on the water ratio can not be ignored. 1. The basic principle of finite element simulation of quenching process; 1. The basic principle of finite element simulation of temperature field is known by the principle of heat transfer, The differential equation of solid heat conduction in two-dimensional transient temperature field with internal heat source is the equation, where QV is the heat flux density of internal heat source; T is the temperature; ¦Ñ Is the material density; CP is the specific heat capacity at constant pressure; K is the thermal conductivity coefficient. In order to get the unique solution of the equation, the initial conditions and boundary conditions must be given. Precision Q345B precision bright tube stock has the advantages of high metal utilization, high strength and easy installation. It is widely used as structural components of automobile, high-speed train, space launch tower, ocean and land oil derrick, port machinery and so on. It can significantly improve the bending resistance, reduce the weight and save a lot of metal materials. Today, the increasingly scarce resources can reflect its value.
Recommended websites: http://www.q345wfg.cn/ ? Q345C seamless pipe, Q345D seamless pipe,
http://www.tjdxgg.cn/ ?? Tianjin 20Cr precision steel pipe
?? The company reserves a variety of specifications of precision seamless pipe, cold drawn precision seamless pipe, cold-rolled precision seamless pipe, perennial business in Tianjin, Baotou Steel, Baosteel, Hengyang, Angang, Chengdu, Yegang, Lubao, Anyang, Jiangyin, Hongdu and other high-quality seamless steel pipe, alloy steel pipe, high-pressure boiler pipe, alloy high-pressure seamless pipe, thick wall seamless pipe, fluid pipe, structural pipe, chemical fertilizer special pipe, Petroleum cracking pipe, low pressure boiler pipe, large diameter seamless pipe, large diameter welded pipe, precision steel pipe, etc. The materials of common resources are: 10 ¡Á 10, 20 ¡Á 10, 45 ¡Á 10, 16Mn, 27SiMn, 12Cr1MoV, 15CrMo, 12Cr1MoVG, 15CrMoG, 10CrMo910, 20Cr, 40Cr, 35CrMo, 304, 316, 316L, 310S, 309S, etc.