Specification knowledge of galvanized coil

Standard specification for galvanized steel

1. Appearance and mechanical properties of galvanized steel plate

Appearance requirements:

Galvanized steel plate should have good surface quality, there should be no defects harmful to the use of the product.

Ungalvanized areas, holes, cracks and scum are not allowed.

The coating thickness should be uniform to avoid exceeding the specified range or problems such as scratches, chromic acid dirt and white rust.

Mechanical properties test:

Tensile test: mainly used to evaluate the strength characteristics of structural, tensile and deep drawing galvanized sheet. Among them, the structural grade galvanized sheet needs to meet the yield point, tensile strength, elongation and other indicators; For materials specially used for tensile processing, more attention is paid to the investigation of their elongation properties.

Bending test: This is one of the important means to measure the forming ability of sheet metal. Under normal circumstances, after 180 degrees bending, there should be no peeling phenomenon of zinc layer on the outside, and the substrate should not crack or break.

Galvanized steel plate

2. Environmental adaptability and service life

Galvanized steel plate is widely used in various occasions because of its excellent anti-corrosion properties. According to the actual conditions of use, its effective rust protection period will also be different:

In dry and clean urban suburban environments, standard galvanized treatment can provide up to 50 years of maintenance-free service life.

In contrast, in places with heavy pollution or near the sea with more salt spray, although the same high-quality galvanizing process is used, it is only expected to guarantee a good state for about 20 years.

3. Cost-benefit analysis

From an economic point of view, the choice of galvanizing as a metal surface protection measure is more cost-effective than other types of paint coatings. This is not only reflected in the initial investment, but also in the maintenance costs saved over the course of long-term operations.

4. Reliability

The galvanized layer is metallurgically bonded to the base material, becoming a part of the whole rather than a simple attachment. Therefore, it has extremely high stability and durability, and is not easy to fall off or damage.

5. Toughness advantage

The special metallurgical structure gives the galvanized layer good elasticity and plasticity, so that it can resist a certain degree of external impact during the transportation and installation process without being easily damaged.

6. Comprehensive protection

Since the entire workpiece can be uniformly covered with a layer of zinc film, even hard-to-reach parts such as dents and sharp corners can be effectively protected, thus significantly improving the overall corrosion resistance.

7. Construction convenience

Compared with traditional painting operations, hot dip galvanizing technology has higher efficiency and can quickly complete large-scale continuous production tasks. In addition, this method also reduces the time and labor costs required for on-site spraying, which is ideal for large-scale engineering projects.