Bnding experiment: it is an important item to weigh the technological function of thin plate. However, the appeal of various galvanized steel sheets in different countries is different. After bending for 180o, the zinc layer on the outside shall not be
separated, and the plate base shall not be cracked or broken.
6. Chemical composition
For the chemical composition of galvanized substrate, different countries have different standards. If Japan does not plead, the United States does. Ordinary products are not inspected.
7. Plate shape
two purposes to weigh the shape of black and white, namely straightness and sickle bend. The flatness of the plate and the large allowable value scale of sickle bend are defined.
The advantages of hot-dip galvanized steel sheet are excellent corrosion
resistance, painting, decoration and good formability. In recent years, the amount of hot-dip galvanized steel sheet in automobile is increasing, and it has become the main body of automobile sheet. Many countries in the world are discussing how to expand
the types and specifications of hot-dip galvanized steel sheet, improve the coating process, and then improve the coating quality, that is, corrosion resistance, resistance to powdering, coating and weldability. The formability of coated sheet has always
been an important aspect of its application, which mainly depends on the substrate performance, coating process and performance and forming process conditions. Good application effect can only be achieved after comprehensive advanced technology matching.