As a relatively common standard part, high-strength bolts have good tightening performance. They are often used in steel frame structures and projects in daily life, and thus have the effect of tightening. Generally, in the construction of steel structure factory buildings, the bolts required are generally above grade 8.8, and they are all high-strength bolts. Sometimes the bolts in the steel frame structure do not need to be electroplated, and it does not matter to use ivory color directly. Generally, most of the high-strength bolts are used to connect some road bridges, rails and high-pressure machines. The high-strength bolts used for high-pressure machines must be prestressed to ensure the airtightness of the container. After heat treatment, the performance level of high-toughness nuts can be greatly improved. Bolts produced by steel structure bolt manufacturers are high-strength bolts and standard parts. This kind of high-strength bolts has good tightening performance, and most of them are usually used in steel frame structures and engineering, so as to have a tightening effect. But we can't blindly follow the trend to carry out heat treatment, we should take corresponding countermeasures in time to repair the problem. Heat treatment method for high-strength bolts: Heat treatment method for removing incandescent lamps; this type of heat treatment generally adopts magnetic induction heat treatment or flame heat treatment, and two hardness testers are used to test the strength of screws, and the heat treatment method that meets the regulations can be selected. The two hardness testers mentioned at this time are: microhardness tester and Rockwell hardness tester; we can also choose from the thickness. When the thickness is thin, the microhardness tester should be used; Generally speaking, when heat-treating its high-strength bolts, you need to pay attention to avoid the influence caused by your own carelessness. At present, most of the high-strength bolts are used in some industries, so when processing high-strength bolts, we should pay attention to their stability and qualification.