Steel wire and wire products - Zinc or zinc-aluminum alloy coating
1 Scope
This standard specifies the technical requirements, test methods and inspection rules for zinc or zinc-5% aluminum or -10% aluminum alloy coating of round steel wire.
This standard is applicable to hot dip plating and electroplating (zinc or zinc-5% aluminum or -10% aluminum alloy) steel wire coating for various purposes.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 470-2008 Zinc ingots
GB/T 1839 Test method for gravimetric determination of the mass per unit area of galvanized coatings on steel products
GB/T 2972 Test method for uniformity of zinc coating on zinc-coated steel wire by the copper sulphate dip
GB/T 2976 Metallic materials - Wire - Wrapping test
GB/T 12689.1 Methods for chemical analysis of zinc and zinc alloys - Part 1: Determination of aluminum content - Chromazurol S-polyethylene glycol octyl phenylether-cetylpyridine bromine spectrophotometry, Chromeazurol S spectrophotometric method and EDTA titrimetry
YB/T 081 Rule for rounding off of numberical values and judgment of testing values for technical standards of metallurgy
YS/T 310 Zinc alloy ingot for hot dip galvanizing
3 Technical requirements
3.1 Materials
3.1.1 Zinc ingots for galvanizing shall meet those specified for Zn99.995, Zn99.99 or Zn99.95 in GB/T 470-2008.
3.1.2 The chemical composition of zinc-5% aluminum or -10% aluminum mischmetal alloy ingot for hot-dip galvanizing shall meet those specified in YS/T 310. As agreed between the supplier and the purchaser, the range of aluminum content may also be adjusted appropriately.
3.1.3 The aluminum content in zinc-5% aluminum mischmetal alloy coating shall not be less than 4.2%, and the test method is shown in Annex C.
3.1.4 The aluminum content in zinc-10% aluminum mischmetal alloy coating shall not be less than 9%, and the test method is shown in Annex C.
3.2 Coating mass
3.2.1 Galvanized steel wire shall be divided into eight grades according to the weight of zinc coating, with the weight of zinc coating at all grades shown in Table 1. Specific zinc coating grades shall be specified in the corresponding product standards for implementation.
Foreword i
1 Scope
2 Normative references
3 Technical requirements
4 Test methods
5 Inspection rules
Annex A (Informative) Comparison of this standard and ISO 7989-2: 2007 (E) in terms of clause/subclause numbers
Annex B (Informative) Technical differences between this standard and ISO 7989-2: 2007 and the relevant reasons
Annex D (Informative) Number of immersion times of zinc coating in copper sulfate test
