The quality regulations for high-quality galvanized steel sheets include specifications, models, appearance, hot-dip galvanized quantity, organic chemical composition, plate shape, physical properties and packaging.
1.The packaging is divided into two types: galvanized steel sheets cut to length and galvanized steel sheets in coils. It is usually packed in tinplate, lined with moisture-proof paper, and tied with iron waist. The binding is firm to prevent the galvanized steel sheet of the inner window from rubbing against each other.
2.Specifications, models, specifications and related product implementation standards (described below) all indicate the thickness, length, total width and allowable errors of the galvanized steel sheet strongly recommended. In addition, the total width and length of the board, and the total width of the roll can also be specified according to customer requirements.
3.Appearance of the surface layer: the galvanized steel sheet has different surface conditions because of the different treatment processes in the coating process, such as general spangles, fine spangles, leveling spangles, zinc-free flowers and pickling and phosphating The surface layer and so on. Galvanized steel sheets and galvanized steel coils cut to length should not have the disadvantages of hazardous applications (described in detail below), but steel coils are allowed to have multiple abnormal parts such as electric welding positions.
4. Hot-dip galvanizing quantity Index value of hot-dip galvanizing quantity: Hot-dip galvanizing quantity is a reasonable way to express the thickness of zinc layer of galvanized steel sheet. There are two types of double-sided hot-dip galvanizing with the same amount (ie equal-thickness hot-dip galvanizing) and different double-sided hot-dip galvanizing (ie, differential thickness hot-dip galvanizing). The company's hot-dip galvanizing capacity is g/m2.
5. Physical properties (1) Compressive strength test: Generally speaking, only Galvanized Steel Plate for construction, drawing and deep drawing can have the characteristics of compressive strength. (2) Tensile test: It is a key new item considering the performance of sheet metal. However, the regulations of various galvanized steel sheets in various countries in the world are not consistent. It is generally stipulated that after the galvanized steel sheet is bent 180 degrees, there must be no zinc layer on both sides of the surface to get rid of, and the plate base must not be cracked or broken.
6. The organic chemical composition regulations for the organic chemical composition of hot-dip galvanized steel sheets are different in different countries in the world. If Japan does not require it, the United Kingdom does. Generally, no finished product inspection is done.
7. Board shape considerations There are 2 index values for the pros and cons of the board shape, namely verticality and long-knife curve. The verticality of the plate and the larger control value of the long-knife curve have certain requirements.
