ASTM B390-92(2006)

Withdrawn Rationale:

This practice for the visual comparison and classification of the apparent grain size and distribution of cemented tungsten carbides was limited to cemented tungsten carbides that contain approximately 6, 10, and 18 % cobalt.

Formerly under the jurisdiction of Committee B09 on Metal Powders and Metal Powder Products, this practice was withdrawn in September 2010. This practice was withdrawn without replacement since it has shown little use in the industry. Also, all of the photomicrographs needed to be replaced with photomicrographs with micron markers, which would be difficult to reproduce.

1.1 This practice for the visual comparison and classification of the apparent grain size and distribution of cemented tungsten carbides is limited to cemented tungsten carbides that contain approximately 6, 10, and 18 % cobalt.

This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

Keywords

apparent grain size; cemented carbides; cemented tungsten carbides; grain size distribution; hardmetals; microstructure; powder metallurgy;

Citing ASTM Standards

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