ASTM International made two announcements related to standards that have implications in metalcasting.

Proposed standards support improved zinc diecasting alloys
ASTM International’s committee on nonferrous metals and alloys is proposing two new standards. One is for a zinc-aluminum-copper alloy with improved strength while the other seeks to determine the requirements for die castings with thin walls which can help reduce industry costs.

The first proposed standard is for an alloy that seeks to improve the elevated temperature strength compared to standard zinc die casting alloys while also improving castability. Creating the standard will involve a review of the literature and data from work previously initiated by the International Lead Zinc Research Organization (ILZRO) and the Council for Scientific and Industrial Research (CSIR). It will also include a review of data from other commercial alloys that are related to this work

The second proposed standard will serve as a companion to an existing standard for high fluidity zinc alloy, (B989). It will provide composition requirements and consolidate the available physical and mechanical properties of these castings.

“The ability to produce strong zinc castings with thin walls results in material savings and reduced secondary machining due to the superior net-shape capability of zinc casting,” says member and committee chairman John Malmgreen, vice president, manufacturing and quality, Eastern Alloys.

New ASTM International standard supports use of foundry sand in asphalt
A new standard will help the road and paving industry make better use of foundry sand in asphalt mixtures. The new standard (D8140) was developed by the ASTM International committee on road and paving material.

The guide covers the physical and chemical requirements (grading, shape, density, toxicity) of virgin or recovered foundry sand used in asphalt mixtures. Contractors, foundry sand suppliers, and other relevant purchasers could benefit from the guide.