scope:

This International Standard specifies the characteristics of cold-reduced carbon steel sheet of commercial and drawing qualities coated by a continuous hot-dip aluminium/silicon alloy coating process.(Footnote 1) This product is used principally for heat-resisting applications and also where corrosion resistance and heat are involved. The coating mass may be specified in accordance with table 2.(Footnote 2) This coating system normally produces a minimum layer of alloy. The coating mass is expressed as the total coating on both surfaces in grams per square metre. The coating mass specified should be compatible with the desired service life, thickness of the base metal and with forming requirements involved. A designation system (see clause 4) includes the coating designation, coating condition and quality.

Aluminium/silicon-coated steel sheet is produced in thicknesses from 0,40 mm to 3,0 mm inclusive and in widths of 600 mm to 1 500 mm (see clause 7) in coils and cut lengths. Aluminium/silicon-coated sheet less than 600 mm wide may be slit from wide sheet and will be considered as sheet.

NOTE 1 Values of total theoretical thickness for coating mass are given in annex A. A method for the determination of coating mass is given in annex B.

Commercial quality aluminium/silicon-coated steel sheet (quality 01) is intended for general fabricating purposes where sheet is used in the flat, or for bending or moderate forming.

Drawing quality aluminium/silicon-coated sheet (qualities 02, 03 and 04) is intended for drawing or severe forming. It is furnished according to the requirements of this International Standard, or, with agreement when ordered, to fabricate an identified part, in which case the mechanical properties in table 3 do not apply. The use of grade 04 minimizes strain ageing.

Drawing qualities are identified as follows:

02 Drawing quality

03 Deep drawing quality

04 Deep drawing quality special killed

Footnote 1 - This product is sometimes known as type 1.

Footnote 2 - Theoretical thicknesses for coating mass given in annex A are for information only.