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After Fabrication HOT DIP GALVANIZING a PRACTICAL REFERENCE for DESIGNERS, SPECIFIERS, ENGINEERS, CONSULTANTS, MANUFACTURERS and USERS

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After Fabrication HOT DIP GALVANIZING a PRACTICAL REFERENCE for DESIGNERS, SPECIFIERS, ENGINEERS, CONSULTANTS, MANUFACTURERS and USERS After Fabrication HOT DIP GALVANIZING A PRACTICAL REFERENCE FOR DESIGNERS, SPECIFIERS, ENGINEERS, CONSULTANTS, MANUFACTURERS AND USERS 1CHAPTER 12CHAPTER 2 3CHAPTER 3 4CHAPTER 45CHAPTER 5 6CHAPTER 6 Hot dip Design, Galvanized Bolting Welding Painting galvanizing – specification, steel galvanized galvanized galvanized Process, inspection of reinforcement steel steel steel applications, galvanized for concrete properties products PREVENTION OF CORROSION ABOUT US GANZ MEMBERS STANDARD SPECIFICATION FOR Galvanizing makes sense and saves dollars HOT DIP GALVANIZED COATINGS www.galvanizing.org.nz CASE STUDIES About us – After Fabrication Hot Dip Galvanizing www.galvanizing.org.nz Prevention of Welcome to GANZ, the Galvanizing Corrosion Association of New Zealand. When iron is extracted from its ore, a What is GANZ? fundamental tendency of nature is abruptly The core of the very best galvanizers in New Zealand belong to the association and meet reversed. Unless protected, iron and steel regularly to discuss technology and product improvements to ensure a quality service and will corrode in most environments, slowly finish. We are united in trying to enhance the product and productivity of our industry and the returning to their natural state. support we can bring to our Building and Engineering industries as a whole. Corrosion prevention is an essential factor Our industry body is 23 years young and is based on a technology that is effectively 150 years in the economic utilisation of steel. old. Some have seen us as a market in either maturity or decline, however this could not be Provision of the appropriate protective further from the truth. Ours is a growing market as people become more aware of the green coating can bring initial savings plus push for environmental responsibility and have seen the impact of leaky homes. substantial economies in service, due to reduction or elimination of maintenance and At GANZ our motto is “Galvanizing makes sense and saves dollars”. This play on words is at lost service time, and by deferring the the heart of the Galvanizing offer – Galvanizing is often cheaper and faster to apply than many replacement date of structures and coatings, and even if it does cost only a few cents more to apply, the long-term saving in equipment. maintenance, replacement or repair, the ease of installation and the lowering of environmental impact ultimately save you many, many dollars down the line. In suitable applications, galvanizing provides ideal corrosion protection for steel – no other coating matches galvanizing’s It makes sense! unique combination of low first cost, Please enjoy the CD and all it has to offer, and don’t hesitate to email or call us with any ease of inspection for coating quality, technical question of problem you may encounter - the earlier the better! durability, predictable performance, low maintenance, and resistance to abrasion Jonathan White and mechanical damage. Chairman Galvanizing Association of New Zealand This manual is designed to assist designers, specifiers, materials engineers, consultants, and fabricators to protect and improve their steel products. All important aspects of the galvanizing process and the properties and applications of galvanized coatings are covered. Sections detail the design and specification of galvanized products, fabrication methods including bolting and welding, and the painting of galvanized steel surfaces. Great effort has been made to make this manual accurate and up-to-date, but responsibility is not accepted for any loss, damage or other consequence resulting from its use. GANZ acknowledges GAA for the writing and production of this After Fabrication Hot Dip Galvanizing Manual. © Galvanizers Association of Australia 2009. page 2 < back chapter start forward > Galvanizers Association of New Zealand – After Fabrication Hot Dip Galvanizing www.galvanizing.org.nz GANZ Members Company Contact Email/Website Avon Industries PO Box 27, Whangarei 0115 Richard Fisher [email protected] Pipiwai Road, Kamo [email protected] www.avonindustries.co.nz CSP Coating Systems PO Box 11 165, Ellerslie, Auckland 1131 Ash Arya [email protected] 40-44 Gavin Street, Auckland www.cspcoatings.co.nz East Tamaki Galvanizing PO Box 58 666, Greenmount, Auckland 1730 Bob Hamilton [email protected] 2/33 Springs Road, East Tamaki Gallagher Group Franklin Division PO Box 445, Pukekohe 1800 Ian Richards [email protected] 37 Subway Road Galvanizing Services PO Box 13 181, Onehunga, Auckland 1643 Andrew [email protected] 23 Edinburgh Street Lonsdale-Cooper www.galvanise.co.nz Perry Metal Protection Ltd PO Box 71124, Avondale, Auckland Jim Burns [email protected] 41 Timothy Place, Auckland www.perrymetalprotection.co.nz Perry Metal Protection Ltd PO Box 10 406, Te Rapa, Hamilton Russell Dewey [email protected] 14 Manchester Place, Hamilton www.perrymetalprotection.co.nz Perry Metal Protection Ltd PO Box 9226, Tauranga 3030 Ken Tynan [email protected] 119 Oropi Road, Bay of Plenty www.perrymetalprotection.co.nz Galvanising Hawkes Bay PO Box 1114, Napier David Middleton [email protected] 41 Thames Street www.galvanising.co.nz Kibby’s Metal Pressings Limited PO Box 75, New Plymouth Marsh Kibby [email protected] Corner of Devon & Dawson Streets Taranaki Galvanizers Ltd Wayne O'Neill [email protected] Corner Monmouth Road St H/way 3 RD23, Stratford Webforge (NZ) Limited PO Box 1506, Palmerston North 5315 Chris James [email protected] 23 Kelvin Grove Road www.webforge.co.nz Perry Metal Protection Ltd PO Box 38 956, Wellington Mail Centre, Graham Black [email protected] 129 Hutt Park Road, Wellington Lower Hutt 5045 www.perrymetalprotection.co.nz CSP Coating Systems PO Box 11 183, Sockburn, Christchurch 8030 Wayne Scott [email protected] 27 Washbournes Road, Christchurch www.cspcoatings.co.nz Perry Metal Protection Ltd PO Box 16 439, Hornby, Christchurch John Notley [email protected] 5 Chinook Place, Christchurch www.perrymetalprotection.co.nz Galvanizing makes sense and saves dollars < back chapter start forward > page 3 About us – After Fabrication Hot Dip Galvanizing www.galvanizing.org.nz Standard specification for hot dip galvanized coatings This specification has been prepared by the Scope General galvanizing industry through its technical This specification covers the galvanized The galvanized coating on all steel articles working group, in consultation with industry coating applied to general steel articles, on the following drawings and material lists and a number of consulting engineering structural sections, angles, channels, shall conform to the requirements of groups. It is intended to be used in beams, columns, fabricated steel AS/NZS 4680 and as specified herein. conjunction with Australian/New Zealand assemblies, threaded fasteners and other Standard 4680 and is designed for simple Drawings: _______________________________________ steel components. insertion into specifiers’ overall materials specifications. This specification does not apply to the _____________________________________________________ galvanized coating on semi-finished products _____________________________________________________ Note such as wire, tube or sheet galvanized in specialised or automatic plants. Items: ____________________________________________ 1. Prior to commencement of design it is recommended that the designer/ _____________________________________________________ fabricator refer to Australian/New Relevant Standards _____________________________________________________ Zealand Standard 4680, in particular AS 1214 Hot dip galvanized coatings on Appendix C ‘Recommended procedures threaded fasteners. Fabrication for design and preparation of materials AS 1627.1 Preparation and pre-treatment Care shall be taken to avoid fabrication prior to galvanizing’, and to the chapter of surfaces - Removal of oil, techniques which could cause distortion or on Design in the CD ‘After Fabrication grease and related embrittlement of the steel. Hot Dip Galvanizing’, produced by contamination. Galvanizers Association of Australia. All welding slag and burrs shall be removed 2. The designer is referred to the AS 1627.4 Preparation and pre-treatment prior to delivery to the galvanizer recommendations contained in Appendix of surfaces - Abrasive blast Holes and/or lifting lugs to facilitate D of AS/NZS 4680 to minimise cleaning of steel. handling, venting and draining during the distortion and reduce the likelihood of AS 1627.5 Preparation and pre-treatment galvanizing process shall be provided at other issues occurring. of surfaces - Pickling positions as agreed between the designer 3. High strength low alloy steels, and the galvanizer. particularly those containing high silicon AS 2309 Durability of galvanized and can, when galvanized, produce brittle electrogalvanized zinc coatings Unsuitable marking paints shall be avoided coatings which are thicker and different for the protection of steel in and consultation by the fabricator with the in colour to normal coatings. The high structural applications – galvanizer about removal of grease, oil, silicon content in weld deposits made Atmospheric paint and other deleterious materials shall be undertaken prior to fabrication. by automatic welding processes may AS/NZS 2312 Guide to the protection of result in thicker coatings being formed structural steel against on these areas. These coating atmospheric corrosion by the Surface Preparation characteristics are usually beyond the use of protective coatings
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