What are the effects of heat treatment on high-strength bolts

What are the effects of heat treatment on high-strength bolts

High strength bolts are the most typical high-strength fasteners. High strength bolts are made of high-strength steel or require greater preload. High strength bolts are mainly used to connect bridges, railways, high-voltage and ultra-high voltage equipment. The fracture of the bolt is very brittle. In order to ensure the sealing of the container, it is necessary to pre-stress the high-strength bolts used in ultra-high pressure equipment. Today, we will use high-strength bolts as an example to describe the heat treatment of high-strength fasteners.

In the 1990s, continuous heat treatment production lines were always in a leading position. The impact bottom mesh furnace is particularly suitable for heat treatment and tempering of small and medium-sized fasteners

High strength bolts must be quenched in accordance with relevant technical requirements. Quenching heat treatment is to improve the mechanical properties of fasteners, in order to meet the requirements of tensile strength greater than the predetermined value and product qualification rate.

The heat treatment process has a crucial impact on the internal quality of high-strength fasteners. Therefore, in order to produce high-quality and high-strength fasteners, advanced heat treatment technology and equipment are necessary. Due to the mass production, low price, fine threads, and precise structure of high-strength bolts, heat treatment equipment must have a large production capacity and a high degree of automation.

Good heat treatment quality. The cleaning, heating, quenching, cleaning, tempering, decolorization, and coloring of the high-strength fasteners provided are all automatically controlled, effectively ensuring the quality of heat treatment. Threaded fasteners may cause decarburization. When they do not meet the mechanical performance requirements, they will first trip, which will lead to the failure of threaded fasteners and shorten their service life. Due to decarburization of raw materials, if annealing is not appropriate, the decarburization layer of the raw materials will deepen. During heat treatment and tempering heat treatment, some oxidizing gas is usually introduced from outside the furnace.