Similar International Standards
ASTM B928/B928M - 21ASTM International (USA)
HighCurrent
Standard Specification for High Magnesium Aluminum-Alloy Sheet and Plate for Marine Service and Similar Environments
Covers high-magnesium 5xxx series alloy plates (e.g., 5083) specifically for marine service, which is a key material in IS 6476.
DNV-RU-SHIP Pt.2 Ch.2DNV (Det Norske Veritas), Norway/Germany
HighCurrent
Rules for Classification: Ships - Part 2 Materials and welding - Chapter 2 Metallic materials
Details material requirements for aluminium alloys used in ship construction, including profiles, properties, and testing.
EN 755-2:2016CEN (European Committee for Standardization)
MediumCurrent
Aluminium and aluminium alloys - Extruded rod/bar, tube and profiles - Part 2: Mechanical properties
Specifies mechanical properties for extruded profiles, including alloys 6082 and 5083 used in IS 6476, but is not specific to bulb plates or marine use.
ISO 6261:2005ISO (International Organization for Standardization)
MediumCurrent
Wrought aluminium and aluminium alloys — Rolled products for marine applications (sheet, strip and plate)
Provides general specifications for rolled aluminium products for marine use, covering relevant alloys but not the specific bulb plate extruded shape.
Key Differences
≠IS 6476:1987 uses older Indian alloy designations (e.g., HE30, NE8), whereas modern international standards use the global 4-digit system (e.g., 6082, 5083).
≠Temper designations in IS 6476:1987 (e.g., 'WP' for solution treated and aged) are less detailed than the modern alphanumeric system used internationally (e.g., T6, T651, H111, H116).
≠International standards like DNV Rules or ASTM B928M mandate more rigorous testing regimes and stricter certification/traceability requirements (e.g., EN 10204 Type 3.1 or 3.2 certificates) than the 1987 Indian standard.
≠While IS 6476 includes 6xxx series alloys (HE30), modern international marine standards place a stronger emphasis on 5xxx series alloys (like 5083, 5086) for superior seawater corrosion resistance, especially for wetted surfaces.
Key Similarities
≈All standards specify requirements for the same fundamental families of alloys suitable for marine construction: heat-treatable Al-Mg-Si (6xxx series) and non-heat-treatable Al-Mg (5xxx series).
≈The primary objective across all standards is to ensure materials possess adequate strength, ductility, and corrosion resistance for structural applications in a marine environment.
≈Key mechanical properties like Tensile Strength, 0.2% Proof Stress (Yield Strength), and Elongation are mandatory specified parameters in both IS 6476 and its international counterparts.
≈All standards recognize the importance of manufacturing control by specifying permissible dimensional and geometric tolerances (e.g., for thickness, straightness, twist) crucial for fit-up and fabrication.