Hot-dip galvanized steel sheet

Hot-dip galvanized steel sheet

The thin steel sheet is immersed in a melted zinc tank so that a layer of thin zinc steel sheet adheres to its surface. As long as the continuous galvanizing process is used for production, that is, the rolled steel sheet is continuously immersed in a zinc tank where zinc is melted to make a galvanized steel sheet.

Galvanizing line

Civilian galvanizing lines are mainly used to cover the surface of steel wires or steel pipes with a layer of galvanizing to improve the corrosion resistance of the material. Such a production line may employ different galvanizing methods including hot and cold galvanizing.

Here is a detailed introduction to both methods: a

Hot galvanized:This method involves immersing the steel piece in a molten zinc tank so that the surface of the steel piece is covered with a layer of zinc. Hot-dip galvanizing is able to provide thicker coating with good adhesion and corrosion resistance. The process consists of continuously immersing the rolled steel sheet in a molten zinc plating tank and then heating to about 50 degrees to form an alloy layer of zinc and iron.

Cold galvanizing (electro-galvanizing):This method deposits a thin layer of zinc on the steel piece by an electrochemical process. Cold galvanizing is less expensive, but the adhesion and corrosion resistance of the plating are less than those of hot galvanizing.

The detailed parameters and equipment characteristics of the civil galvanizing line are as follows

Process parameters

Substrate material (cold rolled carbon structural steel, high quality carbon structural steel and low alloy steel), strip width (600 to 1500 mm), strip thickness (0.15 to 3.5 mm), outer diameter of steel coil (φ800 to 2000 mm), process speed (80 to 200 m/min), energy type (electricity, natural gas, liquefied petroleum gas, gas, steam, air pressure gas, etc.), Coating state (ordinary zinc flowers, small zinc flowers, zinc-free flowers, smooth zinc flowers), coating thickness (50 to 300g/m² (double-sided)), post-plating treatment (smooth finishing, straightening, fingerprint resistance coating/passivation, oiling) 4.

Equipment composition

Mainly includes inlet section with two openers, inlet cross shear, welding machine, inlet trap, cleaning section, furnace section, zinc pot, air knife system, cooling section, leveling machine, bending and straightening machine, passivation machine, outlet trap, quality inspection, oiler, outlet cross shear, outlet section with two tension coil machines, steel coil transport system, Steel coil balers and weighing machines.

Equipment Features

Before hot-dip galvanizing (aluminum), there is a chemical and electrolytic cleaning device to remove dirt on the strip surface; it adopts a horizontal furnace, which has a simple structure, is easy to operate and is easy to maintain; the preheating section is heated by the combustion exhaust gas of the direct flame heating section, and the heating length can be shortened by using direct flame heating, and the oil remaining on the strip surface is burned; The heating and soaking sections of the radiant tubes use “W” type radiant tubes, and the burners of each radiant tube are equipped with heat exchangers to heat the combustion air

Production STRENGTH

The company was established in April 2011. The company covers a total area of more than 270 acres. It is a special high-strength plate and hot-dip aluminum-zinc-silicon steel plate processing and sales enterprise. It is mainly engaged in cold-rolled plates, pickled plates, aluminum-zinc-silicon plating, and galvanized plates. Production, processing and sales, now has one pickling production line, two 1150 unit cold rolling production lines, and four galvanizing production lines with an annual production capacity of 350,000 tons. The company consists of functional departments such as the General Manager's Office, Sales Department, Quality Inspection Department, Finance Department, Production Department, Supply Department, Marketing Department and Logistics Department. The company has more than 270 employees, including 48 technical backbones and 56 with a college degree or above.