scope:

This International Standard specifies the characteristics of carbon steel sheet of commercial and drawing qualities in cut length or coil form, zinc coated by electrolytic deposition. Electrolytic zinc-coated sheet is intended for the manufacture of formed or of miscellaneous parts, and can be supplied chemically treated to render it more suitable for painting. The zinc coating is expressed in micrometres of thickness per side for either equally coated, differentially coated or one-side coated sheets. These sheets are generally produced with coatings which are not intended to withstand outdoor exposure without chemical treatment and painting. Electrolytic zinc-coated sheet may be produced in thicknesses of 0,36 mm and thicker (normally up to 4,0 mm) and in widths of 600 mm and over in coils or cut lengths. It is recognized that materials thinner than 0,36 mm or heavier than 4,0 mm may be suitable for electrolytic zinc coating, and if required should be the subject of agreement between the interested parties.

The thickness of zinc-coated sheet can be specified as a combination of the base metal and metallic coating, or as the base metal alone. The purchaser indicates on the order which method of specifying thickness is required. In the event that the purchaser does not indicate any preference, the thickness as a combination of the base metal and coating will be provided. Annex A describes the requirement for specifying the thickness as base metal alone.

Electrolytic zinc-coated sheet less than 600 mm wide may be slit from wide sheet and will be considered as sheet.

Commercial quality electrolytic zinc-coated sheet (HR1 or CR1) is intended for general fabricating purposes where sheet is used in the flat, or for bending or moderate forming.

Drawing quality elelectrolytic zinc-coated sheet (HR2, HR3, HR4, or CR2, CR3, CR4, CR5) is intended for drawing or severe forming. It is furnished to all requirements of this International Standard or, by agreement when ordered, to fabricate an identified part, in which case the mechanical properties of Table 3 (for hot rolled) and Table 4 (for cold reduced) do not apply.

Drawing qualities are identified as follows:

- HR2/CR2 - Drawing quality

- HR3/CR3 - Deep drawing quality

- HR4/CR4 - Deep drawing quality aluminum killed (see 4.8)

- CR5 - Extra deep drawing quality (stabilized interstitial free)