Why is the lifting chain quenched? Because quenching can improve the hardness, strength, wear resistance, etc. of the chain, the ignition can increase the toughness of the chain. The 80 -level lifting chain is quenched and recovered. The surface hardness is high and the toughness is better. Depending on the diameter of the chain, the temperature of quenching and ignition needs to be adjusted a little. The quenching needs to choose the appropriate temperature according to the size of the material and workpiece, and the same is true for the fire. If the operation error may cause the chain to reach the required strength and toughness. It may not be used because the brittleness is too high, so that the chain is scrapped.