Similar International Standards
ISO 1461:2022ISO (International Organization for Standardization)
HighCurrent
Hot-dip galvanized coatings on fabricated iron and steel articles — Specifications and test methods
Specifies general properties and test methods for hot-dip galvanized coatings on fabricated iron and steel, directly comparable to IS 2629's recommendations for practice and quality.
ASTM A123/A123M-23ASTM International (US)
HighCurrent
Standard Specification for Zinc (Hot-Dip Galvanized) Coatings on Iron and Steel Products
Covers zinc coatings applied by the hot-dip process on various iron and steel products, providing detailed specifications and testing requirements similar to the scope of IS 2629.
BS EN ISO 1461:2022BSI (UK) / CEN (Europe)
HighCurrent
Hot dip galvanized coatings on fabricated iron and steel articles. Specifications and test methods
As the British and European adoption of ISO 1461, it provides identical specifications and test methods for hot-dip galvanized coatings, widely used and directly comparable.
AS/NZS 4680:2006Standards Australia / Standards New Zealand (Australia/New Zealand)
HighCurrent
Hot-dip galvanized (zinc) coatings on fabricated ferrous articles
Details specifications for hot-dip galvanized coatings on fabricated ferrous articles, including properties and test methods, aligning closely with IS 2629's scope and principles.
Key Differences
≠IS 2629:1985 is titled 'Recommended Practice,' indicating a guidance-oriented approach, whereas international standards like ISO 1461 and ASTM A123 are more prescriptive 'Specifications' detailing mandatory requirements.
≠ASTM A123/A123M-23 specifies a slightly higher minimum average coating thickness (100 µm) for structural shapes over 6.4 mm thick, while IS 2629:1985 and ISO 1461:2022 both specify 85 µm for steel over 6 mm thick.
≠IS 2629:1985 references older Indian standards (IS 209:1979) for zinc ingot purity, while modern international standards like ISO 1461:2022 refer to contemporary international or European standards (e.g., EN 1179, ISO 752), which may reflect updated classifications and impurity limits.
≠The steel thickness categories used to define coating thickness requirements vary slightly; for instance, IS 2629 and ISO 1461 use '>6mm' and '3mm to 6mm', whereas ASTM A123 uses '>6.4mm' and '>3.2mm to 6.4mm', potentially leading to minor differences in application for borderline thicknesses.
≠Being an older standard, IS 2629:1985 may not explicitly cover or provide recommendations for certain modern practices like specific post-treatment passivation techniques (e.g., chromium-free), advanced coating repair methods, or detailed environmental/safety considerations during the galvanizing process, which are often addressed or influenced by more recent international standards.
Key Similarities
≈All standards prescribe the fundamental hot-dip galvanizing process, encompassing essential pre-treatment steps such as degreasing, pickling, and fluxing, followed by immersion in molten zinc.
≈A core objective shared across all standards is to provide robust corrosion protection for iron and steel products through the creation of a metallurgically bonded zinc coating.
≈The appearance requirements are largely consistent, demanding a galvanized coating that is continuous, smooth, and free from major defects like bare spots, flux stains, blisters, and gross dross inclusions.
≈All standards correlate the required coating thickness or mass to the thickness of the steel article, acknowledging that thicker steel substrates generally necessitate and achieve thicker protective coatings.
≈The adhesion of the zinc coating to the steel substrate is considered paramount for long-term performance, with all standards specifying test methods, commonly the paring or knife test, to assess coating adhesion.