|New ASTM Color Codes Apply to Zinc Galvanizing Ingot
A new standardized color code system, B 914, Practice for Color Codes on Zinc and Zinc Alloy for Use in Hot-Dip Galvanizing of Steel, covers marking zinc ingots used in hot-dip galvanizing of all steel products. The new color code system is being implemented starting January 1, 2004, with coordination between zinc producers and galvanizers in each instance.
There is a unique color code for each zinc grade and zinc alloy to avoid confusion in the producing plant or in the users mill, explains Richard Lynch, consultant to Minera Mexico Internacional, Inc., in Phoenix, Ariz. The system uses one or two colored stripes for the basic zinc grades, continuous galvanizing grades specified by ASTM, master alloys of Zn-Al and Zn-Sb, and specialty coating alloys GALFAN and GALVALUME. The above compositions are specified in ASTM B 6, Specification for Zinc; B 852, Specification for Continuous Galvanizing Grade (CGG) Zinc Alloys for Hot-Dip Galvanizing of Sheet Steel; B 860, Specification for Zinc Master Alloys for Use in Hot Dip Galvanizing; and B 750, Specification for GALFAN (Zinc-5 % Aluminum-Mischmetal) Alloy in Ingot Form for Hot-Dip Coatings, respectively, and appropriate color codes are also listed in each of these product specifications.
Lynch, who is chair of Subcommittee B02.04 on Zinc and Cadmium, a part of ASTM Committee B02 on Nonferrous Metals and Alloys, which is responsible for the standard, adds that it was possible to develop the color code system and the above standards through the close cooperation between galvanizers and zinc producers, representing both sides of the user/producer equation. This is an important interaction as galvanizing represents well over half of all zinc usage, and zinc is an integral part of galvanizing, he notes.
Subcommittee B02.04 has worked closely with Subcommittee A05.11 on Sheet Specifications, part of Committee A05 on Metallic-Coated Iron and Steel Products, to develop B 914. The standard system is intended to supersede previous proprietary color codes that differ from company to company.
For further technical information, contact Richard Lynch, consultant, Minera Mexico Internacional, Inc., Wyckoff, NJ (phone: 201/891-8399). Committee B02 meets May 17-19 during the May Committee Week in Salt Lake City, Utah. For meeting and membership details, contact Jeffrey Adkins, manager, Technical Committee Operations, ASTM International (phone: 610/832-9738). //
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