There are certain specifications that have been developed for hot-dip galvanizing in order to produce a high-quality coating. The most commonly used specifications design engineers and fabricators should become familiar with in order to promote a high-quality coating and ensure their steel design is suitable for hot-dip galvanizing are:
- ASTM A 123/A 123M: Standard Specification for Zinc (Hot-Dip Galvanized) Coatings on Iron and Steel Products
Single pieces of steel or fabrications with different types of steel products - ASTM A 153/A 153M: Standard Specification for Zinc Coating (Hot-Dip) on Iron and Hardware
Fasteners and small products that are centrifuged after galvanizing to remove excess zinc - ASTM A 767/A 767M: Standard Specification for Zinc-Coated (Galvanized) Steel Bars for Concrete Reinforcement
Reinforcing steel or rebar - ASTM A 780: Standard Practice for Repair of Damaged and Uncoated Areas of Hot-Dip Galvanized Coatings
Touch-up procedures for coating bare spots on an existing hot-dip galvanized product
Other commonly used specifications in the hot-dip galvanizing industry include:
- ASTM A 143/A 143M: Standard Practice for Safeguarding Against Embrittlement of Hot-Dip Galvanized Structural Steel Products and Procedure for Detecting Embrittlement
- ASTM A 384/A 384M: Standard Practice for Safeguarding Against Warpage and Distortion During Hot-Dip Galvanizing of Steel Assemblies
- ASTM A 385/A 385M: Standard Practice for Providing High-Quality Zinc Coatings (Hot-Dip)
- ASTM B 6: Standard Specification for Zinc
- ASTM D 6386: Standard Practice for Preparation of Zinc (Hot-Dip Galvanized) Coated Iron and Steel Product and Hardware Surfaces for Paint
- ASTM E 376: Standard Practice for Measuring Coating Thickness by Magnetic-Field or Eddy-Current (Electromagnetic) Examination Methods
- CAN/CSA G 164: Hot-Dip Galvanizing of Irregularly Shaped Articles
- ISO 1461 Hot-Dip Galvanized Coatings on Fabricated Iron and Steel Assemblies
Specifications and Test Methods
Let’s examine a few of these specifications in more detail.
