Standards for Galvanized Products

Galvanized products should be specified in accordance with the appropriate national standards, which have been drawn up to provide minimum standards to ensure optimum performance of galvanized products and to give guidance in selection, application, and design. AS/NZS 2312 ‘Guide to the protection of structural steel against atmospheric corrosion by the use of protective coatings’ is a particularly valuable reference in the selection of the most practical, economic coating in particular applications.

 

New - AS/NZS 2312.2 - Guide to the protection of structural steel against atmospheric corrosion by the use of protective coatings - Part 2: Hot dip galvanizing

AS/NZS 2312, Guide to the protection of structural steel against atmospheric corrosion by the use of protective coatings, originated in 1967 as a guide for steel designers who needed advice on methods for the corrosion protection of structural steel. The last revision (2002) incorporated much information on the common methods of corrosion protection, including paint, hot dip galvanizing, thermal spray, powder coating and wrapping systems. Unfortunately the complexity of designing and specifying protective paint systems meant that much of the useful information on hot dip galvanizing was lost in the detail of the other systems.

During the review process, it was recognised that steel designers would benefit by separating it into product specific sections to avoid confusion. The revised Standard was released in December 2014; with Part 1 covering paint systems and Part 2 covering hot dip galvanizing (HDG). Both new parts use the same definitions from AS 4312 for corrosivity categories in Australia and Table 14 of NZS 3404.1:2009, but now clearly recognise that the design process and durability of the two products are very different.

Designers wishing to specify HDG need only use two Standards; one covering the design and durability of HDG steel (AS/NZS 2312.2), and the other dealing with the manufacturing process and tolerances (AS/NZS 4680).

Click the link to download a brochure 'An introduction to the new Standard AS/NZS 2312.2'

 

 

Relevant Australian Standards

AS/NZS 4680 Hot dip galvanized (zinc) coatings on fabricated ferrous articles
AS 1214 Hot dip galvanized coatings on threaded fasteners
AS/NZS 2312.2 Guide to the protection of structural steel against atmospheric corrosion by the use of protective coatings -Part 2: Hot dip galvanizing
AS 2331.1.3 Methods of test for metallic and related coatings Method 1.3: Local thickness tests - Magnetic method
AS 2331.1.4 Methods of test for metallic and related coatings Method 1.4: Local thickness tests - Magnetic induction and eddy current methods
AS 4312 Atmospheric corrosivity zones in Australia

 

New Zealand Standards

AS/NZS 4680 Hot dip galvanized (zinc) coatings on fabricated ferrous articles
AS/NZS 2312.2 Guide to the protection of structural steel against atmospheric corrosion by the use of protective coatings - Part 2: Hot dip galvanizing

 

British Standards

BS/EN/ISO 1461 Hot-dipped galvanized coatings on fabricated iron and steel articles - Specifications and Test methods

 

American (ASTM) Standards

A 36 Specification for structural steel

A 123

Specification for zinc (hot-dip galvanized) coatings on iron and steel products
A 143 Practice for safeguarding against embrittlement of hot-dip galvanized structural steel products and procedure for detecting embrittlement

A 153

Specification for zinc coating (hot-dip) on iron and steel hardware
A 384 Practice for safeguarding against warpage and distortion during hop-dip galvanizing of steel assemblies
A 385 Practice for providing high quality zinc coatings (hot dip)
A 767 Specification for zinc coated (galvanized) steel bars for concrete reinforcement
D 6386 Practice for preparation of zinc (hot dip galvanized) coated iron and steel products and hardware surfaces for painting
E 376 Practice for measuring caoting thickness by magnetic-field or eddy-current (electromagnetic) test method

Specification for Hot-Dip Galvanizing