1. Classification standards for

1. GB/T 2518-2019 standard: According to the quality of the galvanized layer, it is divided into different grades of zinc layer weight (g/m2), such as Z60, Z80, Z100, etc. Among them, Z60 means that the zinc layer weight is 60 grams/square meter.

2. ASTM A653/A653M standard: According to the ratio of galvanized layer thickness to steel plate thickness (zinc grade), it is divided into G30, G40, G60, G90 and other grades. Where G30 means the zinc layer thickness is 0.3 ounces/square foot.

2. Characteristics and applications of galvanized steel sheets

1. Good corrosion resistance: Zinc has good corrosion resistance and can form a non-connected zinc layer on the surface of the steel plate, which plays the dual role of quality protection and decorative protection.

2. Good processing performance: The surface of galvanized steel sheet is smooth and easy to cut and stamp.

3. Wide range of applications: Galvanized steel sheets are widely used in construction, home appliances, automobiles, electricity and other fields, such as roof panels, wall panels, home appliance casings, automotive parts, transmission poles and towers, etc.

Different grades of galvanized steel sheets need to be selected for applications in different fields. For example, in the field of construction, it is necessary to choose Z60-Z100 grade galvanized steel sheets with thinner thickness to reduce the weight of the house; in the field of automobile manufacturing, it is necessary to choose G30-G90 grade galvanized steel sheets with higher zinc content to increase product quality and Corrosion resistance.