G550 galvalume steel sheet is a pre-coated steel sheet obtained by hot-dip Al-Zn coating on both sides of cold-rolled steel sheet with various strength and thickness specifications as the base material. The mass percentage of the coating composition is 55% Al and 43.5%. Zn and 1.5% Si combine the physical protection and high durability of Al and the electrochemical protection properties of Zn. In addition, the surface presents a highly decorative bright silver-gray luster and regular patterns, and has a floating convex feeling.
The main advantages are as follows:
(1) The surface is smooth, has excellent atmospheric corrosion resistance, and its corrosion resistance life is 2-6 times longer than that of hot-dip galvanized steel;
(2) It has good heat resistance and oxidation resistance, does not change its color for a long time at 300℃, and can be used for a long time at about 500℃. It has good water resistance and soil corrosion resistance. Its water corrosion resistance is better than hot-dip galvanized sheets and hot-dip galvanized sheets. Galvalume steel sheet has better soil corrosion resistance than hot-dip galvanized sheet. It is an ideal material for the production of corrosion-resistant components such as car silencers, exhaust pipes, grain dryers, water heaters, etc.; in addition, the product's heat reflectivity is higher than 75%, It is twice that of galvanized sheet;
(3) It has excellent paintability and good processing performance. It has strong binding force to organic materials and is the best choice for color organic coated steel plate substrates. Its workability and weldability are similar to that of hot-dip galvanized sheet, and it can be processed by cold bending and stamping, and it has a good appearance. In addition, because the specific gravity of aluminum is smaller than zinc, the specific gravity of the aluminum-zinc alloy coating is only 3.7kg/dm3, while the specific gravity of zinc is 7.1kg/dm3, so the weight of the aluminum-zinc alloy is small under the same coating thickness, which greatly saves Higher prices of coated metals.
The main use of hot-dip galvalume steel sheet:
Construction industry: roofs, exterior walls, garage doors, fences, shutters of civil and industrial buildings
Home appliance industry: ovens, explosion-proof steel strips, outer covers of air conditioning and ventilation systems, solar water heaters, electrical components
Automobile industry: automobile silencers, exhaust pipes and heat shields of catalytic converters, bottom parts of automobile bodies, road signs
Industrial instruments: electric control cabinets, industrial freezers, vending machines
G550 galvalume steel sheet alloy is successfully developed on the basis of hot-dip aluminum and hot-dip galvanizing technology. It not only has excellent atmospheric corrosion resistance, heat resistance and oxidation resistance of aluminum-plated products, but also has galvanized steel products. Excellent electrochemical protection, so that the cuts and scratches are not easy to corrode and rust.
