AS/NZS 4792:1999

1 - AS/NZS 4792:1999 HOT-DIP GALVANIZED (ZINC) COATINGS ON FERROUS HOLLOW SECTIONS, APPLIED BY A CONTINUOS OR A SPECIALIZED PROCESS
4 - PREFACE
5 - CONTENTS
6 - SECTION 1 SCOPE AND GENERAL
6 - 1.1 SCOPE
6 - 1.2 REFERENCED DOCUMENTS
7 - 1.3 DEFINITIONS
7 - 1.3.1 Coating mass
7 - 1.3.2 Coating thickness
7 - 1.3.3 Coating thickness, local
7 - 1.3.4 Continuous (in-line) hot-dip galvanizing
7 - 1.3.5 Galvanizer
7 - 1.3.6 Hot-dip galvanized coating
7 - 1.3.7 Hot-dip galvanizing
7 - 1.3.8 Pre-galvanized strip
7 - 1.3.9 Reference area
8 - 1.3.10 Significant surface
8 - 1.3.11 Supplier
8 - 1.4 GALVANIZING PROCESS
8 - 1.4.1 Pretreatment
8 - 1.4.2 Bath composition
8 - 1.4.3 Galvanizing
8 - 1.4.4 Treatment after galvanizing
8 - 1.5 APPEARANCE AND FREEDOM FROM DEFECTS
9 - SECTION 2 HOT-DIP GALVANIZED COATINGS APPLIED TO HOLLOW SECTIONS ON BOTH SURFACES
9 - 2.1 SCOPE
9 - 2.2 DESIGNATION
9 - 2.3 SELECTION OF TEST SPECIMENS
9 - 2.3.1 For coating mass determinations
9 - 2.3.2 For adherence of the coating (circular sections only)
9 - 2.4 COATING MASS AND THICKNESS
9 - 2.4.1 Coating mass
9 - 2.4.2 Coating thickness
9 - 2.5 ADHERENCE OF COATING
11 - SECTION 3 HOT-DIP GALVANIZED COATINGS ON HOLLOW SECTIONS PRODUCED BY WELDING PRE-GALVANIZED STRIP
11 - 3.1 SCOPE
11 - 3.2 DESIGNATION
11 - 3.3 SELECTION OF TEST SPECIMENS
11 - 3.3.1 For coating mass determination
11 - 3.3.2 For adherence of the coating (circular hollow sections only)
11 - 3.4 COATING MASS
11 - 3.5 ADHERENCE OF COATING
12 - 3.6 WELD COATING
13 - SECTION 4 IN-LINE HOT-DIP GALVANIZED COATINGS APPLIED ONLY TO EXTERNAL SURFACES OF HOLLOW SECTIONS
13 - 4.1 SCOPE
13 - 4.2 DESIGNATION
13 - 4.3 SELECTION OF TEST SPECIMENS
13 - 4.3.1 For coating mass determinations
13 - 4.3.2 For adherence of coating (circular sections only)
13 - 4.4 COATING MASS AND THICKNESS
13 - 4.4.1 Coating mass
13 - 4.4.2 Coating thickness
13 - 4.5 ADHERENCE OF COATING
15 - APPENDIX A - PURCHASING GUIDELINES
15 - A1 GENERAL
15 - A2 INFORMATION TO BE SUPPLIED BY THE PURCHASER
16 - APPENDIX B - MEANS FOR DEMONSTRATING COMPLIANCE WITH THIS STANDARD
16 - B1 SCOPE
16 - B2 STATISTICAL SAMPLING
16 - B3 PRODUCT CERTIFICATION
16 - B4 SUPPLIER'S QUALITY SYSTEM
17 - B5 OTHER MEANS OF ASSESSMENT
18 - APPENDIX C - GENERAL INFORMATION ON FACTORS THAT AFFECT THE CORROSION OF GALVANIZED STEEL
18 - C1 SCOPE
18 - C2 EXTERNAL ATMOSPHERIC CORROSIVITY FACTORS
18 - C3 LOCAL ENVIRONMENT EFFECTS
19 - C4 SEAWATER IMMERSION
20 - APPENDIX D - RENOVATION OF DAMAGED AREAS
20 - D1 EXTENT OF REPAIRABLE DAMAGED AREAS
20 - D2 REPAIR REQUIREMENTS
21 - APPENDIX E - TRANSPORT AND STORAGE OF GALVANIZED HOLLOW SECTIONS
22 - APPENDIX F - DETERMINATION OF COATING MASS AND LOCAL THICKNESS
22 - F1 GENERAL
22 - F2 GRAVIMETRIC METHOD
22 - F2.1 Method
22 - F2.2 Calculation of coating mass
22 - F3 VOLUMETRIC METHOD
22 - F3.1 Method
22 - F3.2 Calculation of coating mass
23 - F4 MAGNETIC, MAGNETIC INDUCTION AND EDDY CURRENT METHODS FOR LOCAL THICKNESS
23 - F4.1 General
23 - F4.2 Calculation of coating mass
23 - F5 MICROGRAPHIC DETERMINATION FOR LOCAL THICKNESS
23 - F5.1 General
23 - F5.2 Calculation of coating mass
23 - F6 TEST REPORT

Specifies requirements for the mass, quality and testing of hot-dip galvanized coatings present on hollow sections galvanized on both surfaces in a specialized plant, hollow sections galvanized on external surfaces only using the in-line process and hollow sections produced by welding pre-galvanized steel strip. Appendices give corrosion information, advice on transport and storage of galvanized products, requirements for the renovation of uncoated areas and methods for the determination of coating mass and local thickness.

This Standard specifies requirements for the mass, quality and testing of hot-dip galvanized coatings applied to-(a) hollow sections galvanized on both surfaces in a specialized plant;(b) hollow sections produced by welding pre-galvanized steel strip; and(c) hollow sections galvanized on external surfaces only, using a continuous (in-line) process.Matters relating to the quality, properties, or dimensional requirements of the steel hollow sections are outside the scope of this Standard.NOTES:1 Advice and recommendations on information to be supplied by the purchaser to the hot-dip galvanizer at the time of enquiry or order are contained in the purchasing guidelines set out in Appendix A.2 Alternative means for determining compliance with this Standard are given in Appendix B.3 For details of testing requirements for uncoated steel hollow sections see relevant product Standards, e.g. AS 1074 and AS 1163.4 General information on factors that affect the corrosion of galvanized steel is given in Appendix C.

First published in Australia as part of AS K53.1-1934 and AS K53.2-1935.
Revised, amalgamated and redesignated AS K53-1942.
Second edition 1960.
Revised and redesignated AS 1650-1974.
Second edition 1981.
Third edition 1989.
Jointly revised and redesignated in part as AS/NZS 4792:1999.