I. Definition
Galvanized sheet, also known as galvanized steel sheet, refers to a layer of metallic zinc being plated on the surface of low-carbon steel base plates (such as cold-rolled sheets and hot-rolled sheets) to prevent the steel sheets from corroding and rusting.
II. Main Production Processes
According to the differences in galvanizing processes, they are mainly divided into two categories:
1.Hot-dip galvanizing
Feature:
The coating is relatively thick (typically 40-200 μm), with excellent corrosion resistance and a long service life (up to 20-50 years).
The surface features zinc granules (including large zinc granules, small zinc granules, and no zinc granules), and its aesthetic quality is relatively average.
The cost is relatively low and it is the most widely used galvanizing method.
Main standards: GB/T 2518, ASTM A653, JIS G3302.
2. Electro-galvanizing
Feature:
The coating is thin (typically 3-20 μm), uniform and smooth, with excellent surface quality.
The corrosion resistance is average and not as good as hot-dip galvanizing, but it is easy to undergo subsequent processing (such as painting, phosphating).
It has good processing formability and welding performance.
The cost is usually higher than that of hot-dip galvanizing.
Main standards: GB/T 15675, ASTM A879.
III. Brand
Common grades (taking the Chinese standard as an example):
DC51D+Z (SGCC): Ordinary commercial-grade hot-dip galvanized sheet.
DC52D+Z (SGC340): Hot-dip galvanized sheet for mechanical clamping.
DC53D+Z (SGC490): The structure is made of hot-dip galvanized sheet.
DC54D+Z (SGC570): High-strength steel hot-dip galvanized sheet.
SECC: Commonly used grades of electro-galvanized sheet metal.
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