The weight of the zinc on any article after galvanizing depends on the thickness of the article being galvanized. Normally, galvanizing will add 4% to 8% to the nominal weight of a steel article.
How thick is a Galvanised coating?
Conclusion On most galvanized items that need to accommodate moving parts, the thickness of the galvanized coating is typically 100 microns or 1/10 mm.
How much thickness does hot dip galvanizing add?
Typical galvanized coatings range from 3-8 mils (75-200 mi- crons) thick. When designing and detailing tapped holes, the increased thickness is important.
How is galvanized thickness measured?
There are two methods for measuring the zinc coating thickness of hot-dip galvanized steel; a magnetic thickness gauge and optical microscopy. The simplest and non-destructive way is to utilize a magnetic thickness gauge, as optical microscopy is a destructive test only used to resolve measurement disputes.
What are the specifications for hot-dip galvanized steel coating?
There are three main specifications (ASTM A123, A153, and A767) governing the coating thickness, adherence, and finish for hot-dip galvanized steel and a handful of supporting specifications referenced in these specifications; cover design practices, repair and touch-up, and painting/powder coating over galvanizing.
What is astastm A153 standard for hot dip zinc coating?
ASTM A153 Standard Specification for Zinc Coating (Hot-Dip) on Iron and Steel Hardware, covers zinc coatings applied by the hot-dip process on iron and steel hardware. It is intended to be applicable to hardware items that are centrifuged or otherwise handled to remove excess zinc.
What is the ASTM a123/a123m-17 for galvanizing?
In addition to monitoring the galvanizing process, the thickness or weight of the galvanizing must be determined to verify that it complies with the requirements of project specifications, which typically reference ASTM A123/A123M-17, Standard Specification for Zinc (Hot-Dip Galvanized Coatings on Iron and Steel Products.
How thick should galvanized coatings be?
Typical galvanized coatings range from 3-8 mils (75-200 mi- crons) thick. When designing and detailing tapped holes, the increased thickness is important. Best practice suggests that the hole be tapped after galvanizing, removing the coating on the interior mating surface.
