Analysis: Classification and Code of Galvanized Coil Performance Levels

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For galvanized coils, the sheet steel is immersed in a molten zinc bath to make a sheet of zinc coated on its surface. It is mainly produced by continuous galvanizing process, that is, the rolled steel plate is continuously immersed in a plating tank with molten zinc to make galvanized steel plate; alloyed galvanized steel plate. This kind of steel plate is also manufactured by hot dip method, but immediately after being out of the tank, it is heated to about 500 ℃ to form an alloy coating of zinc and iron. This galvanized coil has good paint adhesion and weldability.

(1) The classification and code of performance levels are as specified in Table 1.
Table 1 Classification and code of performance
Level Performance Level Code Scope of Application
General Purpose 01
Mechanical bite 02 Zinc layer weight code shall not exceed Z350
Stamping 03 The thickness range is ≥0.4mm, and the weight of the zinc layer does not exceed Z275
deep drawing 04
Special killed steel deep drawing 05
Non-aging super deep drawing 06
Structural 220, 250, 280, 320, 350, 400, 450, 550 Plate thickness < 0.4mm not suitable for grades 220, 250, 280 and 320
(2) The types and codes of substrates are as specified in Table 2.
Table 2 Types and codes of substrates
Substrate type Code
Cold rolled coil
Hot rolled pickled coil H
(3) The classification and code of the type of double-sided equal-thickness galvanized layer and the weight of the coating are as specified in Table 3. Upon agreement between the supplier and the buyer, steel sheets and steel strips with coating weights not listed in Table 3 can also be provided.
Table 3 Classification and code of zinc coating types and coating weights