What are the classifications of galvanized iron wire?

Hot metal blanks are rolled into 5 mm thick steel bars, and then put into wire drawing equipment to draw wires with different diameters. The aperture of wire drawing disc is gradually reduced, and various iron wires with different specifications are made through cooling, annealing, coating and other processing technologies. According to the industry standard, the specifications of wire binding are as follows: 25# wire with a diameter of 0.50mm, 24# wire with a diameter of 0.55mm, 23# wire with a diameter of 0.60mm, and 22# wire with a diameter of 0.70mm, 0.8 mm- 1.6 mm, etc. There are three galvanizing processes for galvanized iron wire in Dongguan: 1. After cleaning and annealing, the strip steel does not enter the zinc pot for hot galvanizing, and the galvanizing section consists of zinc pot, sinking roller, stabilizing roller and air knife. 2. Zinc pots are generally welded with pure iron or made of ceramic materials. For the zinc pot with pure iron structure, the resistance element for heating the zinc pot can be installed outside the zinc pot or immersed in the bottom of the zinc pot. Because of the advantages of ceramic zinc pot in service life and cost reduction, ceramic zinc pot is more and more widely used. Usually, continuous hot dip galvanizing production line adopts induction heating. 3. When the unit is in normal production state, the zinc pot does not need to be heated, because the heat brought by the strip steel is enough to maintain the heat required by the zinc liquid in the zinc pot, and resistance heating can only be started when the unit is stopped. In addition to zinc, zinc solution contains 0.05% to 0.25% of lead, 0. 1% to 0.3% of aluminum and 0.03% to 0.05% of iron. When zinc cools and solidifies on the surface of strip steel to form zinc flower, lead plays the role of crystal bud, while aluminum and zinc form an aluminum alloy layer with strong adhesion, which plays a role in enhancing the adhesion between zinc layer and matrix. Stabilizing roller and air knife control the thickness and uniformity of zinc layer, and advanced air knife can control each zinc layer at the level of 30 grams per square meter. Generally speaking, the greater the air pressure of air knife, the smaller the distance, the slower the speed of strip steel and the thinner the zinc layer. According to the relationship between zinc layer thickness and these parameters, the control of zinc layer thickness has been able to realize closed-loop automatic control at present. Galvanized iron wire is mainly divided into galvanized iron wire and yellow iron wire, which are used in communication equipment, medical equipment, netting, handicrafts and other industries. Made of high-quality low-carbon steel wire rod, the number of wires is mainly from 6 # to 38 #, and can also be customized according to customers' special requirements. Galvanized iron wire has the characteristics of good surface luster, uniform zinc layer, strong adhesion and long corrosion resistance.