The next step is heat treatment.

The next step is heat treatment. The heat treatment of bolts is generally carried out in a continuous heat treatment furnace, which is suitable for mass production. Generally, it is necessary to go through these stages: cleaning, degreasing, quenching, cleaning, and tempering. The heat treatment process has a great bearing on the mechanical properties of the bolts, and the temperature stability requirements for the entire process are very high. The high-end market is basically occupied by foreign countries, and domestic brands occupy the low-end market.