galvanized steel, hot dip plating method and plating method, two kinds of production technology, product variety of the same.
Galvanized steel (galvanized sheet steel)
plated zinc (or zinc alloy) layer of 0.3 to 3.0mm thick steel sheet, - surface protection metallurgical products. It has excellent resistance to atmospheric corrosion. Zinc layer in the atmosphere, its surface can form a corrosion protection film to protect the internal steel substrate and zinc cathodic protection effect on steel substrate as the anode of the coating can extend the life of the steel plate, plated du In addition to plating The zinc layer has a beautiful decorative effect. Galvanized steel is widely used in buildings, vehicles, electrical equipment, household appliances and a variety of daily necessities and so on.
galvanized steel produced using a continuous strip electroplating method, first started in the 1930s to the 1960s after only developed in the 1980s World steel pipe network editing , mainly due to the needs of the automotive industry, production and doubling .
varieties and specifications of galvanized steel is also international. Amount by galvanizing, electroplating method is very easy to produce single-sided coating both sides of the difference between the thick coating, so the single-sided galvanized amount within the range of 3 ~ 50g/m2 divided into 3,10,20,30,40 50g/m26 grades into double-sided thick, of different thickness or single-sided coating. Mechanical properties, due to the electroplating process is the production of cold strip the original mechanical properties remain unchanged, so the performance type of hot dip galvanized steel, you can supply the types of performance of cold-rolled steel. After plating treatment, phosphate treatment, chromate treatment, special chromate treatment, coated with a type of oil or no treatment. Galvanized steel to improve the performance of the direction of electro-galvanized alloy, one of the most mature World steel pipe network editing , electro-galvanized - nickel alloys (nickel-containing 10% ~ 15%) steel plate, the salt spray test the corrosion life of galvanized steel, 4 to 5 times. This electro-galvanized - nickel alloy plate is developed to adapt to the automobile industry to extend the demand for body corrosion life from the early 1980s, the 1980s has put into production in Japan, the United States and Germany, these countries since the new plating zinc steel plate production line are mostly built of galvanized and galvanized steel - nickel alloy, multi-purpose production line. Galvanized steel, mostly after painting some new electro-galvanized production line in the galvanizing segment and added to the online organic coating device, the direct production of a zinc coating and organic coating products, known as the organic compound coated steel - varieties. This variety has the additional fingerprint resistant, self-lubricity, excellent coating performance to meet the various needs of the automotive, appliance and other industrial sectors. Galvanized steel production in the future will alloy, multilayer and composite direction.
with hot galvanized steel, galvanized steel is characterized by thin, uniform coating surface straight no spangle, painted later than hot dip beautiful, but also because of the coating is thin and corrosion able than the hot-dip products. The steel plate is usually applied to the surface to be painted to be protective and decorative purposes, such as automobiles, household appliances, office automation equipment and used items in the indoor environment components and so on.
hot dip galvanized steel varieties and specifications the provisions of the international roughly the same. Divided into six grades the by galvanized amount, 120 ~ 610g/m2 (both sides of the galvanized amount), within the supplier. The mechanical properties of grade, general level, stamping processing level, deep leveling and high-intensity level, and other varieties. Normal spangle, small spangle and no spangle surface spangle shape. Press-plated handle chromate passivation, phosphate treatment, oiling, or level machine or light machine processing treatment after plating. And - known as galvannealed steel sheet varieties (U.S. trade name Galvaneal) hot dip strip processing line alloying furnace to make the galvanized layer into about 10% of the iron zinc - iron alloy layer, the better the corrosion resistance and coating, suitable for the specialized needs of certain users. Some production lines one side hot dip galvanized steel varieties, due to the complexity of the production process, is not common. Into - further improve the corrosion resistance of hot dip galvanized steel, has developed a variety of zinc - aluminum alloy hot dip steel plate, more mature, there are two, can be produced in the hot dip slightly modified production line. - Kind of aluminum - zinc alloy coated steel developed by Bethlehem Steel Corporation in 1972, the coating composition 55% Al-43.5% Zn-1.5% Si, trade name Galvalume, the salt spray test the corrosion life of galvanized steel sheet 2 to 4 times. Another - is in the United States, International Lead Zinc Research Organization (ILZRO, International, Overread into Lead Zinc Research, Organization,) in 1981 to develop zinc - aluminum alloy coated steel sheet, the coating composition containing 0.1% Cerium Lanthanum zinc - 5% aluminum alloy, the International Trademark name Galfan, salt spray test corrosion life of hot dip galvanized steel sheet 2 to 3 times its unique point of no brittle alloy layer between the coating and steel substrate, and therefore have a better formability and painting. The production and application of these two products was gradually extended.
hot dip galvanized steel as early as the early 19th century, manufactured in Europe using the flux method. In the 20th century, with the progress of the cold strip rolling production process, 1927 the Polish Sendzimir (T.Sendzimir) strip annealing and hot dip galvanizing process combined invented the decomposition of ammonia to protect gas reduction strip continuous hot dip zinc, improved product quality and production efficiency. Since then hot dip galvanized steel production in the process on the basis of rapid development.