Selection Requirements For Raw Materials In Bolt Factory

Posted by abyihui on October 16th, 2019

First of all, the tensile strength of high-strength bolt raw materials has a great relationship with the quenching process. Generally, it is difficult to reach the raw material requirements of 10.9 high-strength bolts after 40-degree quenching treatment. If it is not strictly normal inspection, it can be quenched according to the product. After the surface hardness to determine the strength of its tensile strength. In addition to the difference in performance in the process, high-strength bolts of different raw materials have different retardation and fracture properties under high pressure conditions.
Secondly, the high-strength bolts of 40Cr quenching treatment are mainly used in the bolt ball node grid. The design strength is generally 390MPa (d>=30mm) or 430MPa (d<30mm). There is no high pre-use in use. Pulling pressure, if you want to add high pre-tension, you should also pay attention to understand and guarantee its delayed fracture performance. In order to produce qualified high-strength bolt products, it is best to do it strictly according to requirements.
Haiyan Yihui Hardware Technology Co., Ltd. is a professional Bolt Factory. We are professional in the selection of raw materials and in the design of products, so please choose us with confidence, we will be your best partner.