AS 1397-1993 pdf free.Steel sheet and strip – Hot-dipped zinc-coated or aluminium/zinc-coated.
1.1 SCOPE This Standard specifies requirements for hot-dipped zinc-coated or aluminium/zinc-coated steel sheet and strip, supplied in thicknesses up to and including 5.0 mm.
This Standard specifies requirements for steel grades, coating classes and surface finish, as follows:
(a)Three formability grades of steel
(b)Six structural grades of steel
(c)Six classes of zinc coating
(d)Two classes of zinc coating converted to zinc/iron alloy
(e) Two classes of aluminium/zinc alloy coating
(f) Surface finish
NOTES:
Advice and recommendations on information to be supplied by the purchaser at the time of enquiry or order are contained in Appendix A.
Alternative means for determining compliance with this Standard are given in Appendix B.
The specified requirements apply to the full length and full width of the product supplied,unless otherwise indicated.
1.3 DEFINITIONS For the purpose of this Standard, the definitions below apply.
1.3.1 Coating class
1.3.1.1 Zinc coating class-either Class Z or Class ZF as follows
(a)Class Z-essentially a zinc coating incorporating minor additions of control elements only.
NOTE: Normally provided with a chromate passivation treatment, not oiled.
(b) Class ZF-zinc coating converted to a zinc/iron alloy.
NOTE: Normally lightly phosphated, or oiled.
1.3. 1.2 Aluminium/zinc alloy coating class (Class AZ)-composed of essentially 50% to 60% aluminium with the remainder Zinc but incorporating minor additions of control elements
NOTE: Normally provided with a chromate passivation treatment, not oiled
1.3.2 Coating mass-the total amount of coating on both surfaces of the steel base, measured in grams per square metre of sheet or strip.
NOTE: Because of the difficulty in accurately measuring thickness of normal hot-dipped coated product, coating thickness is not subject to specification. The approximate coating thickness for various coating classes is given in Paragraph C4 of Appendix C.
1.4.3 Designation of coating class and surface finish
1.4.3.1 Zinc coating class The zinc coating class shall be designated by the prefix ‘Z’or” ZF (see Clause 1.3.1. 1),followed by a number representing the minimum coatin masS, in grams per square metre of sheet (total both surfaces)， determined by the triple spot test(see Clause 3.2).
1.4.3.2 Aluminium/zinc coating class The aluminium/zinc alloy coatin class shall be designated by the prefix AZ(see Clause 1.3.1.2)， followed by a number representing the minimum coating mass, in grams per square metre of sheet (total both surfaces determined by the triple spot test.AS 1397-1993 pdf free download.