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Material selection requirements for high-strength bolts
In addition to the different properties in the treatment process, high-strength bolts with different raw materials have different delay and fracture properties under high pressure. First of all, the tensile strength of the raw material of high-strength bolts has a lot to do with its quenching process. Generally, it is difficult to meet the raw material requirements of 10.9 high-strength bolts after 40-degree quenching treatment. If it is not in strict normal inspection, it can be quenched according to the product. After the surface hardness to judge the quality of its tensile strength. (Guide: About the three materials of fasteners)
Secondly, high-strength bolts with 40Cr quenching treatment as raw materials are mainly used in the bolt spherical joint grid. The design strength is generally 390MPa (d>u003d30mm) or 430MPa (d<30mm). High pretension pressure, if you want to add a high pretension, but also pay attention to understand and ensure its delayed fracture performance. The quality of high-strength bolts is the key, and it is necessary to strictly follow the requirements.
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