Common heat treatment methods for chains

Common heat treatment methods for chains: annealing, normalizing, quenching, tempering, carburizing, nitriding, carbonitriding, and boronizing.The aging treatment has artificial aging treatment and natural aging treatment.

　1: Annealing, heat the workpiece to 3-30 degrees above Ac50, after holding for a certain period of time, slowly cool down to 500 degrees with the furnace and cool in the space.
　2: Normalizing, an operation in which steel parts are heated to Ac3 or above Acm, and then taken out of the furnace and cooled in the air after heat preservation.
　3: Quenching, heating the steel to Ac3 or more than Ac1, and then rapidly cooling it in a cooling liquid such as water or oil after heat preservation, and an unstable structure has been obtained.
　4: Tempering, a heat treatment process in which the quenched steel is reheated to a temperature below Ac1, and then cooled to room temperature after heat preservation.
　5: Natural aging treatment, the signs of aging that occur when the workpiece is stored at room temperature or under natural conditions for a long time, is called natural aging treatment.
　6: Artificial aging treatment, using the aging treatment process of heating the workpiece to a higher temperature and performing aging treatment in a shorter time, called artificial aging treatment.