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China Galvanized Steel Suppliers
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The general requirements, including tolerances for thickness, width, camber, shape, etc., for hot-dip galvanized sheet are presented in Specifications. Specific product designations for hot-dip coated galvanized sheet are listed in ASTM or Japanese Specification.
A broad range can be expected because the final sheet thickness has a significant influence on the mechanical properties and formability. Normally, the yield strength value tends to increase and the formability values tend to decrease as the steel sheet thickness decreases.
Surface Treatment
Steel Galvanized Sheet can be specified with five types of surface treatment:
1. Chemical Treatment: consists of the application of a thin, relatively invisible, corrosion-inhibiting inorganic chemical film on the zinc surface.
2. Oil: Oil is generally used instead of a chemical treatment to protect the surface when the product is intended to be painted. In these applications, the sheet must be thoroughly cleaned to remove the oil prior to painting.
3. Chemical Treatment and Oil: A combination of "chemical treatment and oil" can be specified when the effectiveness of the chemical treatment is desired for humid-storage stain resistance and an oil is needed for enhanced formability.
4. Dry: Galvanized sheet is ordered "dry" if neither chemical treatment nor oil is compatible with the customer's requirements.
5. Phosphatized: The phosphate treatment is a relatively thick, dense, crystalline deposit of hydrated zinc phosphate compounds on the galvanized surface. After phosphating, the surface has a dull gray appearance.China Galvanized Steel Suppliers
website:http://www.runfeigroup.com/galvanized-steel/
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