Summary of color coated steel plates
Color-coated steel plate is a new type of steel strip pre-coating product that has been rapidly developed in the world in the past thirty years. The coating quality is more uniform and ideal than that of single-piece spraying or brushing on the formed metal surface, and it has the advantages of both steel plate and steel plate. The advantages of both steel plates and organic materials include the mechanical strength and easy formability of steel plates, as well as the good decorative properties and corrosion resistance of organic materials. Color-coated steel plates are products made from cold-rolled steel plates, electro-galvanized steel plates, hot-dip galvanized steel plates or galvanized steel plates as the base plate. After surface degreasing, phosphating and complex salt treatment, they are coated with organic coatings and baked.
Commonly used coatings for color-coated steel plates are polyester (PE), followed by silicone modified resin (SMP), high weather-resistant polyester (HDP), polyvinylidene fluoride (PVDF), etc. The coating structure is two-coated and one-baked. Two coats and two bakes. The coating thickness is generally 20-25u on the surface and 8-10u on the back. For external use in buildings, it should not be lower than 20u on the surface and 10u on the back.
Color coated steel plate.
Commonly cited standards are American ASTM A527 (galvanized), ASTM AT92 (aluminized zinc), Japanese JIS G3302, European EN/0142, Korean KS D3506, Baosteel Q/BQB420. Coating properties*Polyester (PE) has good adhesion, a wide range in formability and outdoor durability, and medium chemical resistance. The service life is 7-10 years.
*Silicon modified resin (SMP)
The coating film has good hardness, abrasion resistance and heat resistance, as well as good external durability and non-chalking properties, but limited gloss retention and flexibility. The service life is 10-15 years.
*High weather resistance polyester (HDP)
It has excellent UV resistance and high durability, and its main properties are between polyester and fluorocarbon. The service life is 10-12 years.
Polyvinylidene fluoride (PVDF)
Has good formability and color retention, excellent outdoor durability and chalking properties, solvent resistance, limited colors. The service life is 20-25 years.
Color-coated profiled steel plate, commonly known as color steel plate, uses high-quality cold-rolled steel plate, hot-dip galvanized steel plate or galvanized steel plate as the base plate. After surface degreasing, phosphating and chromate treatment, it is coated with organic coating and then Made by baking, it has the characteristics of light weight, high strength, bright color and good durability. Widely used in construction, home appliances, decoration, automobiles and other fields.
The strength of the color steel plate depends on the substrate material and thickness, and the durability depends on the coating (galvanized bright 318g/m2) and surface coating. The coating includes polyester, silicone resin, fluororesin, etc., and the coating thickness is more than 25um. The coating structure includes two coatings and one drying, two coatings and two dryings, etc. The maintenance-free service life can be 20-30 years depending on the environment and atmosphere.
1. Type.
Color-coated steel plates are classified according to the substrate, including cold-rolled substrate, hot-dip galvanized substrate and electro-galvanized substrate. According to the surface condition, there are three types: coated plate, embossed plate and printed plate.
2.Construction
The coating structure of the color-coated steel plate includes five layers: top coating, chemical coating film, bottom coating, zinc layer, and cold-rolled steel plate.
