Quality Control Standards

The quality requirements of good grade galvanized sheet contain several aspects such as specification size, surface, galvanizing amount, chemical composition, sheet shape, machine function and packaging.

1. Packaging is divided into cut-to-length galvanized sheet and galvanized sheet with a roll of two kinds of packaging. General tin packaging, lined with moisture-proof paper, outside the iron waist tied, tied firmly to prevent friction between the inner galvanized sheet.

2. Specification size of the relevant product standards (such as the following and) are listed in the galvanized sheet of the guaranteed scale thickness, length and width and its allowable defects. In addition, the width and length of the plate, the width of the roll can also be determined according to user requirements.

3. Surface profile: galvanized sheet because of the coating process in the disposal method differences, the profile of the situation is also different, such as ordinary zinc flower, fine zinc flower, flat zinc flower, no zinc flower and phosphating disposal profile and so on. Cut to length galvanized sheet and galvanized coil shall not exist to affect the use of the shortcomings, but the coil allows welding parts and other less deformed parts.

4. Galvanized amount of galvanized amount of scale value: measuring the amount of galvanized is to determine the thickness of the zinc layer of galvanized sheet is a widely adopted method. There are two sides of the same amount of galvanized (i.e., equal thickness galvanized) and two sides of the amount of galvanized unequal (i.e., differential thickness galvanized) two kinds. The unit of galvanized amount is g/m2.

5. Machine function (1) tensile test: generally speaking, as long as the layout, stretching and deep drawing with galvanized sheet tensile function requirements. (2) bending test: is an important name to weigh the process function of the sheet. But the world's various types of galvanized sheet requirements are not quite the same. General requirements of galvanized sheet bending 180o, the outer coating shall not have the zinc layer left, the plate base shall not have cracking and fracture.

6. Chemical composition of the chemical composition of the galvanized substrate requirements, the world's standards are not equal. Such as Japan has this requirement, the United States does not. Generally not for product testing.

7. plate shape weighing plate shape black and white there are two objectives, namely, straightness and sickle bend. Plate straightness and sickle bend of the maximum permissible value of the scale has a certain delimitation.