ANSI B18.2.1 Bolts Are Strictly Manufactured

First of all, the tensile strength of high-strength ANSI B18.2.1  bolt raw materials has a lot to do with the quenching process. Generally, it is difficult to achieve the raw material requirements of 10.9 high-strength ANSI B18.2.1 bolts after 40-degree quenching treatment, if not strictly normal. In the inspection, the tensile strength of the product can be judged according to the surface hardness after quenching treatment. In addition to the different performance in the process, high-strength ANSI B18.2.1 bolts with different raw materials have different retardation and fracture properties under high pressure conditions. Secondly, the high-strength ANSI B18.2.1 bolts used for quenching 40Cr are mainly used in the ANSI B18.2.1 bolt ball joint grid. The design strength is generally 390MPa (d>=30mm) or 430MPa (d<30mm). There is no high pre-tensioning pressure during use. If you want to add high pre-tension, pay attention to understanding and guarantee the delayed fracture performance. In order to produce qualified high-strength ANSI B18.2.1 bolt products, it is best to do as strictly as required.