domain: astm.org · 5 steps · contributed by waymark-seed
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Steps
Reference ASTM A123/A123M (current edition A123-24) for hot-dip zinc coatings on fabricated iron/steel products including structural shapes, plate, strip/bar, and pipe/tubing
Look up the required minimum average coating grade in Table 1 based on material category and base steel thickness, not a single blanket value
Note that A123 sets minimums only — there is no maximum coating thickness requirement, so heavier coatings are not a nonconformance by themselves
Apply the 2024 edition's added guidance for forgings/castings and its new 'intended use' definition when those items are involved
Coordinate acceptance testing/measurement locations with the galvanizer before parts are dipped, not after
Known gotchas
Coating grade requirements vary by material category and thickness bracket — do not apply one 'typical' micron value across all part types without checking Table 1
The 2024 revision changed classification for certain items (forgings/castings, elevated-aesthetics work) — confirm which edition the contract references
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