Hot Dip Galvanized Steel Sheet

Continuous sheet galvanizing is also a hot dip process but is only applied to steel sheet strip and wire.

Hot dip galvanized steel sheet.

Hot dip galvanizing is a process of coating steel with a thin zinc layer which serves as a barrier between the steel and the environment. Hot dip galvanized roofing sheet tolerances on dimensions and shape according to din en 59 231. G90 is not a galvanizing specification. Hot dip galvanized hdg steel is often just called galvanized steel although the full name is more correct.

A coil to coil process steel sheets from 0 010 to 1 70 inches 0 25 mm to 4 30 mm thick and up to 72 inches 1 830 mm wide is passed as a continuous ribbon through cleaning baths and molten zinc at speeds up to 600 feet per minute. Produces high quality hot dip galvanized steel coils and electrogalvanized coils. When exposed to the atmosphere the pure zinc zn reacts with oxygen o 2 to form zinc oxide which further reacts with carbon dioxide co 2. Production of galvannealed sheet steel begins with hot dip galvanization of sheet steel.

This specification is for hot dip galvanizing steel sheet using the continuous high speed galvanizing process. In alternative processes the flux solution floats on the top of the molten zinc and the steel item receives the flux layer as it enters the hot dip tank to be galvanized. A thin coat of zinc adheres to the steel part and is quickly oxidized by the surrounding atmosphere. The steel is rinsed again immersed in a flux bath removed and allowed to dry.

Shanghai aiya industrial co ltd. Hdg steel products are prepared by plunging a steel product into a vat of molten zinc. Protect against corrosion with hot dipped galvanized steel sheet and coil products from alliance steel. Hot dip galvanization is a form of galvanization it is the process of coating iron and steel with zinc which alloys with the surface of the base metal when immersing the metal in a bath of molten zinc at a temperature of around 449 c 840 f.

Commercial steel deep drawing steel and extra deep drawing steel are designations described in the astm specifications for steel sheet zinc coated galvanized or zinc iron alloy coated galvannealed by the hot dip process a653 a653m. It is a coating thickness designation in the galvanizing specification astm a653. After passing through the galvanizing zinc bath the sheet steel passes through air knives to remove excess zinc and is then heated in an annealing furnace for several seconds causing iron and zinc layers to diffuse into one another causing the formation of zinc iron alloy layers.