Other Galvanizing Standards

There are Canadian and international specifications that may be used to specify hot-dip galvanizing on a project. The differences in these specifications and the ASTM specifications are minimal, and for the most part, only differ slightly in the minimum coating thickness/weight required for each type and thickness of product being hot-dip galvanized.

Here is a summary of these specifications for hot-dip galvanizing (taken from CSA and ISO Standards):

CAN/CSA-G164 Hot Dip Galvanizing of Irregularly Shaped Articles

Scope

1. This standard specifies the requirements for zinc coating (galvanizing) by the hot-dipping process on iron and steel products made from rolled, pressed, or forged shapes such as structural sections, plates, bars, pipes, or sheets 1 mm thick or thicker.
2. Applies to products intended or primarily for use in electrical and communication systems made from rolled, pressed, cast iron, or forged shapes such as structural sections, plates, bars, pipes, or sheets 1 mm thick and thicker.
3. Does not apply to continuous galvanizing of chain link fence fabric, wire, sheet, and strip.
4. Does not apply to pipe and conduit that are normally hot dip galvanized by a continuous or semicontinuous automatic process.
5. Inspection and Sampling procedure varies slightly from ASTM A123.
6. Maximum allowable size for repair at the galvanizing plant varies from ASTM A123.
7. The values stated in SI units are to be regarded as the standard. The values in parentheses are imperial units and are included for information only.

ISO 1461 Hot Dip Galvanized Coatings on Fabricated Iron and Steel Articles

Scope: This Standard specifies the general properties of and methods of test for coatings applied by hot dipping in zinc (containing not more than 2% of other metals) on fabricated iron and steel articles.

It does not apply to:

1. Sheet and wire continuously hot dip galvanized;
2. Tube and pipe hot dip galvanized in automatic process;
3. Hot dip galvanizing products for which specific standards exist and which may include additional requirements or requirements different from those of this European Standard.
4. After-treatment/overcoating of hot dip galvanized articles is not covered by this standard.

NOTE Individual product standards can incorporate this standard for the coating by quoting its number, or may incorporate it with modifications specific to the product.

NOTE Hot-dip galvanizing to ASTM A123/A123M or ASTM A153/A153M will typically lead to an end quality equivalent to ISO 1461. However, there are significant differences between ISO 1461 and ASTM A123/A123M or A153/A153M regarding inspection methods and documentation. Please refer to ISO 1461 for the specific requirements regarding inspection methods and minimum average coating thickness requirements. The European General Galvanizers Association (EGGA) provides additional guidance on their website.

AASHTO M111: Zinc (Hot-Dip Galvanized) Coatings on Iron and Steel Products

Scope: This standard is applicable to parts galvanized after fabrication such as structural shapes, strip and bar, plate, tubing/piping, wire, etc. The standard is equivalent to ASTM A123.

AASHTO M232: Zinc Coating (Hot-Dip) on Iron and Steel Hardware

Scope: This standard is applicable to parts galvanized after fabrication such as fasteners and small parts that must be spun/centrifuged after galvanizing to remove excess zinc from threads, etc. It is equivalent to the specification ASTM A153.