We know that the gourd in the hand is made from two chains. Divided into bracelets and bearing chains. The bracelet zipper is made of Q235, and the surface is mostly galvanized. The carrier chain is made of a lifting chain, and the material is made of 20mn2 alloy structure steel. It is made from the process of fully automatic equipment drawing, editing chain, welding, heat treatment, and correction. The use of German standard EN818-2 is the production standard, and the chain can withstand 80 cows per square millimeter. The surface of the chain can be primary, black, carburizing, and can be selected according to needs. The price of the lifting chain on the market is still different. Different prices are also different. In terms of raw materials, good raw materials have less impurities and more stable performance. Good raw materials and poor raw materials are made in the same process and the hardness of the chain of the chain are obviously different. Equipment is equally important. Full automatic equipment is better than semi -automatic equipment, and the spacing is more standard. Old equipment, if there is a chain surface, there are scars and do not meet the standards, you need to replace it with new equipment according to the situation. The lifting chain from the factory needs to be passed through the appearance testing and the tension test is qualified before the factory can be issued.