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Hot-Dip Galvanizing Process

Inspection/Quality Control

Inspecting the hot-dip galvanized coating for conformance to specification is an uncomplicated task. The simplicity of the process yields complete coating coverage and consistent coating thickness.  The two most important components to an inspection are a simple visual inspection to ensure coating coverage and a brief series of coating thickness measurements to assure conformance to the appropriate specifications.

The specification for hot dip galvanizing of steel reinforcing bars is handled in different ways around the world. Some countries treat steel reinforcing bars in the same way as any other steel product, and the hot dip galvanizing of rebar falls under a general galvanizing standard (see table below). Several other countries have developed product specific standards for the hot dip galvanizing of steel reinforcing bars. These are also listed below:

  Designation Title of Standard
Galvanizing Standards
Australia/New Zealand AS/NZS 4680 Hot-dip galvanizing (zinc) coatings on fabricated ferrous articles
Canada CAN/CSA G164 Hot dip galvanizing of irregularly shaped articles
South Africa SABS/ISO 1461 Hot dip galvanized coatings on fabricated iron and steel articles
Europe EN ISO 1461 Hot dip galvanized coatings on fabricated iron and steel articles
International Standards Organization ISO 1461 Hot dip galvanized coatings on fabricated iron and steel articles
Reinforcing Steel Standards
United States ASTM A 767 Zinc-coated (galvanized) steel bars for concrete reinforcement
France NF A35-025 Hot dip galvanized bars and coils for reinforced concrete
Italy UNI 10622 Zinc-coated (galvanized) steel bars and wire rods for concrete reinforcement
India IS 12594 Hot-dip coatings on structural steel bars for concrete reinforcement specifications
International Standards Organization ISO 14657 Zinc-coated steel for the reinforcement of concrete
Europe prEN EC019023 Steel for reinforcement - Galvanized reinforcing steel
Reinforcing Steel Specifications
Germany Z-1.4-165 Allgemeine Bauaufsichtliche Zulassung - Feuerverzinkte Betonstahle
General approval by the building authorities - Galvanized reinforcing steel

Further guidance and support in creating a hot dip galvanized rebar specification is available from regional galvanizing associations, as listed on the regional listings page.