Steel Sheet, Aluminum-Coated, by the Hot-Dip Process
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Dec 11, 2025
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This specification covers aluminum-coated steel sheet with two types of aluminum coating applied by the hot-dip process, with several coating weights.
A463/A463M: Standard Specification for Steel Sheet, Aluminum-Coated, by the Hot-Dip Process
When designing and manufacturing components that demand superior corrosion resistance and thermal reflectivity, specifying the correct material is paramount. ASTM A463/A463M provides the essential framework for ensuring the quality and performance of aluminum-coated steel sheet produced via the hot-dip process, making it a cornerstone standard for numerous industries.
What is A463/A463M?
ASTM A463/A463M is an authoritative standard that defines the requirements for steel sheet coated with aluminum using the hot-dip method. Developed by ASTM International, this comprehensive specification ensures consistency in material properties, coating characteristics, and manufacturing processes for aluminum-coated steel sheet intended for a wide array of demanding applications.
Scope & Purpose
This industry-leading standard governs the production and quality of aluminum-coated steel sheet, available in both coils and cut lengths. It details the specifications for two distinct types of aluminum coatings (Type 1 with aluminum-silicon alloy, and Type 2 with commercially pure aluminum) and various coating weights. While it covers a broad range of steel types, including commercial, forming, deep drawing, structural, and high strength-low alloy steels, it relies on other ASTM standards for general requirements and specific material properties.
Who Must Comply?
- • Primary audience: Metallurgists, Materials Engineers, Quality Control Inspectors, Production Engineers, and Procurement Specialists involved in the procurement or specification of coated steel products.
- • Industries affected: Steel Manufacturing, Metal Fabrication, Automotive, Construction, Appliance Manufacturing, and Aerospace.
- • Compliance nature: Primarily voluntary, driven by contractual agreements and customer specifications, but often becomes de facto mandatory due to industry adoption and supply chain requirements.
- • Enforcement: Typically enforced through contractual obligations between suppliers and purchasers, and verified via quality control testing and certification.
Key Requirements Overview
Professionals utilizing A463/A463M must ensure adherence to several core provisions:
- • The standard requires specific chemical compositions for the base steel, categorized by steel type (e.g., Commercial Steel, Structural Steel, etc.).
- • It mandates distinct requirements for the two types of aluminum coatings, including their bath composition and intended applications.
- • Key provisions include detailed specifications for coating weights, with designations like T1-40 or T1M 120, ensuring predictable corrosion resistance and performance.
- • The specification outlines the need for compliance with general requirements for hot-dip coated steel sheet, as defined in ASTM A924/A924M.
- • Mechanical properties for certain steel types are specified, while others are provided as non-mandatory typical values for informational purposes.
Related Standards & References
To fully implement A463/A463M, professionals will often refer to complementary ASTM standards:
- • ASTM A924/A924M: This standard provides the general requirements for steel sheet, metallic-coated by the hot-dip process, and is referenced extensively within A463/A463M.
- • ASTM A428/A428M: This test method details the procedures for determining the weight of
Copyright & official sources
This page provides educational summaries and compliance aids. For the official, legally binding standard text, please purchase the current edition from the original publisher. Acquiring original publications supports continued standards development and ensures you have the complete, authoritative document.