Is The Heat Treatment Of The Fasteners Simple

The heat treatment of fasteners should be divided into the strength requirements of fasteners, 4.8 grades without heat treatment, 5.6 grades can be normalized, 8.8 grades and 10.9 grades should be quenched after high temperature tempering, 12.9 grades and above should be used high The strength steel is quenched and then isothermally tempered. The fasteners should be selected according to the accuracy requirements. The order of heat treatment is required. If the precision is high, it is necessary to roll after heat treatment. If the requirements are low, it can be heat treated after rolling. Heat treatment is in accordance with the heat treatment specifications of various materials, and it must be strictly controlled in the data. Because high-strength fasteners are related to the user's life and property, they are subject to supervision by the quality supervision department. In addition, the heat treatment process, to prevent oxidation, over-burning, overheating, deformation and other defects, must have a certain knowledge of heat treatment. Therefore, only one type of fastener heat treatment, as long as the heating temperature, holding time, quenching temperature and quenching medium, tempering temperature and time, it can be. Better to master. But the variety of fasteners is diverse. Because of this, the heat treatment of fasteners is not too difficult in the various techniques of mechanical manufacturing, but to do well, we must work harder.