The quality inspection standards for galvanized steel plates are an important means of ensuring that their quality and performance meet the specified requirements. The following is a detailed explanation of the quality inspection standards for galvanized steel plates:

1. Packaging

The packaging of galvanized steel sheet should be divided into two types: galvanized sheet cut to a fixed length and galvanized sheet wrapped in coils. Generally, it is packaged with iron sheet, lined with moisture-proof paper, and tied with iron waistband. The binding should be secure to prevent damage caused by friction between the galvanized sheets inside.

2. Specification and size

The specifications and dimensions should comply with the relevant standards, including recommended standard thickness, length, width, and allowable deviations. The specifications and dimensions of the entire batch of goods should be consistent, and the nominal size of the goods label should also match the actual size of the goods.

3. Appearance quality

The appearance quality of galvanized steel sheet is one of the important indicators for testing its quality. The surface of high-quality galvanized steel sheet should be flat and smooth, without any defects that affect its use, such as cracks, bubbles, inclusions, scars, folds, etc. At the same time, the surface condition of galvanized sheet may also vary depending on the treatment methods used in its coating process, such as ordinary zinc flowers, fine zinc flowers, flat zinc flowers, zinc free flowers, and surfaces treated with phosphating.

4. Galvanized amount

The galvanizing amount is a commonly used and effective method to indicate the thickness of the zinc layer on galvanized sheet. The standard value of galvanizing amount should be determined according to specific usage requirements, and there are two types: two with the same galvanizing amount on both sides (equal thickness galvanizing) and two with different galvanizing amounts on both sides (differential thickness galvanizing). The detection of galvanizing amount is usually carried out by chemical analysis or physical measurement methods.

5. Mechanical performance

The mechanical properties of galvanized steel plates are also an important aspect of their quality inspection. Mechanical properties mainly include tensile strength and bending performance. Tensile strength refers to the maximum tensile force that galvanized steel plates can withstand during tensile testing; Bending performance is the main item for measuring the process performance of thin plates. Generally, after bending galvanized plates 180 degrees, there should be no zinc layer detachment on the outer surface, and the plate base should not have cracks or fractures.

6. Chemical composition

The requirements for the chemical composition of galvanized substrates may vary according to national standards. But generally speaking, the chemical composition of galvanized steel plates should comply with the relevant standards to ensure their good corrosion resistance and processing performance.

7. Other inspection items

In addition to the above-mentioned inspections, according to specific usage requirements, other inspections may also be required for galvanized steel plates, such as plate shape, surface roughness, corrosion resistance tests, etc. These inspection items aim to comprehensively evaluate the quality and performance of galvanized steel plates, ensuring their compliance with relevant regulations and requirements.
In summary, the quality inspection standards for galvanized steel plates involve multiple aspects, including packaging, specifications and dimensions, appearance quality, galvanizing amount, mechanical properties, chemical composition, and other inspection items. The development and implementation of these standards are of great significance for ensuring the quality and performance of galvanized steel sheets.