Answer: On the continuous unit, cold-rolled strip steel, galvanized steel strip (electro-galvanized and hot-dip galvanized) is used as the substrate, subjected to surface pretreatment (degreasing and chemical treatment), and coated by one or more layers by roller coating. A layer of liquid coating, which is obtained by baking and cooling, is a coated steel sheet. Since the coating can have a variety of different colors, it is customary to refer to a coated steel sheet as a high quality Galvalumed steel sheet. Since the coating is carried out before the forming of the steel sheet, it is called a pre-coated steel sheet abroad.
Why use galvalumed steel?
1. Since the GL steel sheet is strictly controlled in the production process, it has uniform quality in terms of appearance, durability and processability.
2. The GL steel sheets produced in large quantities are inexpensive, and the solid content of the coatings is high compared with the finished part coating treatment method, and the organic coatings are low in loss and economically cost-effective.
3, the use of wholesale GL steel sheet can greatly simplify the processing technology, and there is no environmental pollution caused by chemical treatment painting and baking.
What is the use of galvalumed steel sheets?
Answer: wholesale GL steel sheets are lightweight, aesthetically pleasing and have good corrosion resistance, and can be directly processed, so they can be widely used in construction, shipbuilding, vehicle manufacturing, furniture and electrical industries.
What types of coatings are used for galvalumed steel sheets?
Answer: The types of coatings are epoxy, polyester, silicon modified polyester, polyvinylidene fluoride, polyurethane and so on.
How to choose galvalumed steel plate?
Answer: Depending on the environment and application, GL steel sheets with different substrates or different coating types should be used. Generally, for exterior use, galvalumed steel sheets with hot-dip galvanized substrates should be used. The galvanizing capacity is generally ≥180 g/m. 2 (double sided). When it is required to maintain gloss and color retention for 10 to 20 years, polyvinylidene fluoride coating should be used.