This International Standard applies to carbon steel sheet of eommereial, lock-forming and drawing qualities; coated: by a continuous, hot-dip. zinc coating process. Zinc-coated sheet is suitable for applications where resistance to corrosion is of prime importance and is produced according to coating designations as shown in table 2. Under atmospheric conditions the protection afforded by the coating is directly proportional to the mass of coating per unit area. 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. Various types of zinc coating (see 3.2) are available depending on the application.
2. Commercial quality zinc-coated sheet (quality 01') is intended for general fabricating purposes where sheet is- used in the flat, or for bending or moderate forming. It is produced in thicknesses from 0,25 mm to 5 mm inclusive after zinc coating, and in widths 600 mm and over in coils and cut lengths.
3. Lock-forming quality zinc-coated sheet (quality 02) is intended for lock-seaming and other similar applications and has better formability than commercial quality. It is produced in thicknesses from 0,25 mm to 5 mm inclusive after zinc coating, and in widths 600 mm and over in coils and cut lengths. The coating designation shall not exceed 350.
4. Drawing quality zinc-coated sheet (qualities 03, 04, 05 and 06) is intended for drawing or severe forming. It is produced in thicknesses from 0,4 mm to 5 mm inclusive after zinc coating, and in widths 600 mm and over in coils and cut lengths. It is fur-
nished to all the requirements of this International Standard, or, with agreement when ordered, to fabricate an identified part, in which case the mechanical properties of table 3 do not apply. The coating designation shall not exceed 275.
Drawing qualities are identified as follows:
03: Drawing quality
04: Deep drawing quality
05: Deep drawing quality special killed
06: Extra deep drawing quality stabilized
5. Zinc-coated sheet less than 600 mm wide may be slit from wide sheet and will be considered as sheet.
SANS 3575:1996 history
0000 SANS 3575-2008
1996SANS 3575:1996 Continuous hot-dip zinc-coated carbon steel sheet of commercial, lock-forming and drawing qualities