According to national standards, the thickness of galvanized sheet should be between 0.15 mm and 4.5 mm, and the thickness of the zinc coating should be between 35 microns and 600 microns. The wall thickness standard of specific galvanized steel pipes varies according to type and grade, such as the wall thickness of welded galvanized steel pipe A is 1.0mm to 7.5mm.
Galvanized sheet is a treatment process that coats the surface of metals such as iron and steel with a layer of zinc metal to increase the corrosion resistance of the metal and extend its service life. So, what is the national standard thickness of galvanizing? Let's explain the galvanized sheet thickness standard in detail.
1.Galvanized sheet thickness range
According to national standards, the thickness of galvanized sheet should be between 0.15 mm and 4.5 mm. This range covers the thickness of galvanized sheet required in most application scenarios. At the same time, the thickness of the zinc coating is also an important indicator for measuring the quality of galvanized sheet, and its thickness should be between 35 microns and 600 microns.
2.Classification of galvanized layer thickness
The galvanized layer thickness can be further subdivided into the following categories:
①.The galvanized layer thickness is less than or equal to 2.5 microns, which is called "light galvanizing". This galvanized layer thickness is thinner and is suitable for some occasions where the anti-corrosion requirements are not high.
②.The galvanized layer thickness is between 2.5 microns and 5 microns, which is called "general galvanizing". This galvanized layer thickness is moderate and is widely used in various metal products that require anti-corrosion treatment.
③.The galvanized layer thickness is above 5 microns, which is called "heavy galvanizing". This galvanized layer thickness is thicker and has stronger anti-corrosion ability, which is suitable for the protection of metal products in harsh environments.
3.Galvanized steel pipe wall thickness standard
In addition to galvanized sheets, galvanized steel pipes are also common galvanized metal products. The national standard wall thickness standards for different types of galvanized steel pipes are different. For example, the wall thickness standards of grade A, grade B and grade C of welded galvanized steel pipes are 1.0mm to 7.5mm, 1.6mm to 12mm and 2.0mm to 16mm respectively; while the corresponding wall thickness standards of seamless galvanized steel pipes are 2.0mm to 12mm, 3.0mm to 14mm and 3.5mm to 16mm respectively. When selecting galvanized steel pipes, the appropriate type and wall thickness should be selected according to the specific application and pressure requirements.
4.Precautions for selecting the thickness of galvanized sheet
In practical applications, the selection of galvanized sheet should be based on specific circumstances. Too much or too little galvanized layer thickness will have an adverse effect on the quality and service life of the galvanized sheet. Too thin galvanized layer may not provide sufficient anti-corrosion protection, while too thick galvanized layer may lead to increased costs and increased processing difficulties. Therefore, when selecting galvanized sheet, factors such as its thickness, galvanized layer quality and cost should be considered comprehensively.
