1.Subject Matter and Scope

This standard specifies the technical requirements, test methods and inspection rules of hot-dip galvanized steel.

This standard applies to the production of steel carbon structural steel, steel pipes assembly member has a curved or pre-plating welded pipe fittings, container and bulk processing of steel parts and similar products, hot dip galvanized coatings apply with all kinds of ships galvanized steel, anti-corrosion treatment.

2.Reference Standard

GB470 "zinc"

GB534 "industrial sulfuric acid, hydrochloric acid industry, industrial chlorinated press"

GB / 2 343-84 "galvanized common process"

GB / T 13912-93 Metallic coatings, steel products, hot dip galvanized layer specification

GB / T 3019-92 low pressure fluid galvanized welded steel pipe

3.Technical requirements

1.Material

A, zinc: zinc GB470 One should not be less than specified.

B, sulfuric acid: concentrated sulfuric acid level should be consistent with the provisions of GB534.

C, hydrochloric acid: should meet the level of concentrated hydrochloric acid GB534 regulations.

D, of the press: GB2946 chloride levels should be consistent with the provisions of the press.

2.Exterior

A, continuous coating surface is smooth and there is practicality.

B, plating combination does not allow the installation of sagging, dropping left or slag exists.

C, plating plated surface should be seamless, exposed iron and other defects, but defects when the following conditions is allowed.

a. Drain plating area of 0.5 mm or less in diameter spots.

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