Hot-dip galvanized steel strip galvanizing method

I, the significance of hot-dip galvanized steel strip

Cold-formed thin-walled section steel is commonly used black material, cold-formed after a simple descaling and painting treatment is put into use, its service life is subject to certain limitations (generally in about 5 years that will appear large areas of rust). The hot-dip galvanized steel strip that our company proudly introduced to the market is hot-rolled strip steel as a substrate, through pickling, cold rolling, heating reduction, galvanizing and other processes produced, its products can fully meet the GB510018-2002 "cold-formed thin-walled steel structure technical specifications," the standard, in the construction industry can be used in a large number of applications, but also in the automotive, railroad locomotive manufacturing, warehouse board manufacturing, highways, guardrails and other industries. Guardrail and other industries.

II, hot-dip galvanized steel strip galvanizing method

1, hydrogen reduction method of galvanizing Hydrogen reduction method of galvanizing was invented in 1937, hydrogen reduction method of hot-dip galvanizing laid the foundation for modern continuous hot-dip galvanizing. The appearance quality of the products produced by the hydrogen reduction process and the bonding strength of the galvanized layer are superior to those of solvent galvanizing. Reduction galvanizing in the strip after pickling into the heating reduction furnace, with hydrogen reduction of the oxide film produced after pickling, and in the process of heating reduction so that the surface of the steel plate to produce a layer of spongy reduction layer, into the zinc pot can produce a layer of bi-directional combination of good, uniform zinc-iron alloy layer, greatly increasing the adhesion of the zinc layer, which also determines the galvanizing method of energy consumption costs are high.

Ammonium chloride solvent method of galvanization Ammonium chloride solvent method of galvanization was invented in 1837. Ammonium chloride solvent method of production process products, because of the ammonium chloride solvent method of galvanization does not have a heating reduction process, the appearance of the quality of the zinc layer and the surface bonding of the zinc layer than the hydrogen reduction method of galvanization is slightly worse. This also determines its galvanization method of energy consumption costs lower than the hydrogen reduction method of galvanization.

III, the amount of galvanized steel plate galvanized amount is generally 180-220g / ㎡, in the humid southern region can correspondingly increase the amount of galvanized to 275g / ㎡ to improve the service life of steel components. The service life of galvanized products is generally 20-25 years.

Fourth, galvanized steel strip zinc layer characteristics galvanized zinc layer is not able to form zinc flower, hot-dip galvanized layer of zinc flower, the formation process is as follows: when the galvanized strip from the zinc pot out of the air knife blowing, a large number of zinc liquid was blown back to the zinc pot, when the strip steel surface there is a pure zinc layer, liquid attached to the surface of the steel plate, the formation of a large number of crystal nuclei on the surface of the steel plate, along with the rise of the steel plate to cool down, so that the crystal nuclei slowly grow into the zinc flower. The faster the cooling speed, the smaller the zinc flower, the slower the cooling speed, the larger the zinc flower.