1. Although the hot-dip galvanizing substrate with the largest amount of building materials is currently in a large capacity, it lacks a good substrate such as a zinc-free flower flat hot-dip galvanized steel coil and a zinc alloy coated steel coil; 2. The variety and quality of domestic coatings can not fully meet the demand. The high price of imported coatings reduces the competitiveness. The plastic film required for the color film of the film still needs to rely on imports. It lacks high-grade color with thick coating, functionality, high strength and rich colors. Coated 3. The product is not standardized, resulting in serious waste of resources. There are too many low-capacity units with a capacity of 40,000 tons/year or less, and there are problems in product quality and environmental resource protection; 4. There are too many new color coating units in the country, which far exceeds the market demand. As a result, the operating rate of many color coating units is very low, and even the production is stopped. Steel Angle,Angle Steel,Angle Iron Seamless Steel Pipe Co., Ltd. , http://www.cz-steelpipes.com