TECHNICAL

Coating Thickness

AS/NZS 4680:2006 is the manufacturing standard for the hot dip galvanizing coatings on fabricated ferrous articles. The Standard includes requirements for coating mass and thickness, appearance, defect identification, and suitable repair methods.

Table 1 and Table 2 of AS/NZS4680 state the requirements for coating thickness and mass, which are based on the steel article thickness.

Table 1

Requirements for coating thickness and mass for articles that are not centrifuged.

Article Thickness mm Minimum Local Coating Thickness μm Minimum Average Coating Thickness μm Minimum Average Coating Mass g/m²
Less than 1.5 35 45 320
1.5 to 3.0 45 55 390
3.0 to 6.0 55 70 500
Over 6.0 70 85 600
Over 6.0+ 85 125 900
Table 2

Requirements for coating thickness and mass for articles that are centrifuged.

Article Thickness mm Minimum Local Coating Thickness μm Minimum Average Coating Thickness μm Minimum Average Coating Mass g/m²
Less than 8.0 35 45 320
More than 8.0 45 55 390