Amercian Standards for Galvanized Steel

Amercian Standards for Galvanized Steel

Coating Steel Product Standards

For coated-steel sheet products, the standards are written by ASTM Committee A05, a body comprised of knowledgeable volunteers who oversee the development and revision of the specific standards related to coated steel products.  

Inch-Pound versus SI 

When an ASTM standard number is written as, for example, A653/A653M, it means it is a “Dual” standard and allows the product to be ordered in either “Inch-Pound” (English) units, or “SI” (Metric) units. The two sets of units are to be regarded separately as standard units.  In the text the SI units are shown in brackets.  Keep in mind that the values stated in each system are not exact equivalents and each system must be used independently of the other.  In this example, when ordering galvanize to inch-pound units, specify A653.  When ordering to SI units, specify A653M. 

Almost all ASTM standards for coated sheet products are dual specifications.  The exceptions are some of the electrogalvanize products, viz., A917 and A918.  These standards, while not having an “M” after the number, specify only SI units. 

The common terms that are included in many customer requirements such as G60, A40, Commercial Steel (CS), Deep Drawing Steel (DDS), etc. all have their origin within the appropriate ASTM Standard.

Coating Name Coating Composition ASTM Specification
Galvanize Zinc A653/A653M A1063/A1063M
Galvanneal Zinc – 10% Iron A653/A653M
Aluminum-Zinc 55% Aluminum – Zinc A792/A792M
Zinc-Aluminum Zinc – 5% Aluminum A875/A875M
Zinc-Aluminum-Magnesium Zn – 0.5/13% Al – 0.4/4% Mg A1046/A1046M
Aluminized Al – 5/11% Si, or pure Al A463/A463M
General requirements for all hot-dip coatings – ASTM A 924/A 924M

ASTM Hot-Dip Steel Sheet Specifications

A653/A653M - Standard Specification for Steel Sheet, Zinc-Coated (Galvanized) or Zinc-Iron AlloyCoated (Galvannealed) by the Hot-Dip Process

A1063/A1063M - Standard Specification for Steel Sheet, Twin-Roll Cast, Zinc-Coated (Galvanized) by the Hot-Dip Process

A792/A792M - Standard Specification for Steel Sheet, 55% Aluminum-Zinc Alloy-Coated by the Hot-Dip Process

Scroll to Top