scope:

This International Standard applies to continuous hot-dip zinc-coated carbon steel sheet of structural quality in the grades listed in table 2. The product is intended for structural purposes where particular mechanical properties are required. It is also intended for applications where resistance to corrosion is of prime importance and is produced to coating designations as shown in table 3. Under atmospheric conditions the protection afforded by the coating is directly proportional to the mass of coating. The mass of coating specified shall be compatible with the desired service life, thickness of the base metal and with the forming requirements involved. The coating is expressed as the total coating on both surfaces in grams per square metre. A designation system (see clause 4) includes the coating designation, coating condition, and grade. Various types (see 3.2) of zinc coating are available depending on the application.

Zinc-coated structural quality sheet is produced in thicknesses from 0,25 mm to 5 mm after zinc coating, and in widths of 600 mm and over in coils and cut lengths. Zinc-coated sheet less than 600 mm wide may be slit from wide sheet and will be considered as sheet.

NOTE 1 Thicknesses less than 0,4 mm may not be available in grades 220, 250, 280 and 320.

This International Standard does not cover steels designated as commercial quality, lockforming quality or drawing quality, which are covered in ISO 3575(Footnote 1).

Footnote 1 - ISO 3575:1996, Continuous hot-dip zinc-coated carbon steel sheet of commercial, lock-forming and drawing qualities.