High-strength bolts are the most typical high-strength fasteners.

High-strength bolts are made of high-strength steel, or bolts that require greater preload.High-strength bolts are mainly used for the connection of bridges, railways, high-pressure and ultra-high-pressure equipment.The fracture of this bolt is a brittle fracture.In order to ensure the sealing of the container, the high-strength bolts used in ultra-high pressure equipment need to be prestressed.

In the 1990s, the continuous heat treatment production line has been in a leading position.Impact bottom mesh furnace is particularly suitable for heat treatment and tempering of small and medium-sized fasteners

High-strength fasteners must be quenched according to relevant technical requirements.Quenching and heat treatment is to improve the mechanical properties of fasteners to meet the requirements of their tensile strength greater than a predetermined value and product yield.

The heat treatment process has a vital impact on the internal quality of high-strength fasteners.Therefore, in order to produce high-quality and high-strength fasteners, it is necessary to have advanced heat treatment technology and equipment.Due to the large production volume and low price of high-strength bolts, the threaded part is relatively fine and the structure is accurate, so the heat treatment equipment must have a large production capacity and a high degree of automation.

Good heat treatment quality ability.Cleaning-heating-quenching-cleaning-tempering-from the supply of high-strength fasteners to decolorization and coloring, all automatic control operations effectively ensure the quality of heat treatment.Threaded fasteners may cause decarbonization. When the mechanical performance requirements are not met, tripping will first occur, which will cause the threaded fasteners to fail and shorten the service life.Due to the decarbonization of raw materials, if the annealing is improper, the decarbonization layer of raw materials will deepen.In the process of heat treatment and tempering heat treatment, some oxidizing gas is usually introduced from outside the furnace.