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ASTM B930-03(2021)

Current Reaffirmation

Standard Test Method for Rating Grain Size and Frequency of Abnormally Large Grains in Cemented Tungsten Carbides (Hardmetals)

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1.1 This test method describes a procedure for measuring abnormally large grains and the frequency of those grains in cemented tungsten carbides (hardmetals).

1.2 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

1.3 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.


5.1 The microstructure and grain growth of cemented tungsten carbides affect the material's mechanical and physical properties. The grain size and distribution will affect the material's wear resistance and fracture toughness. Abnormally large grains as compared to the background may introduce an area of weakness in a sintered part.

5.2 This test method may be used in acceptance testing of cemented tungsten carbide materials or the tungsten carbide powder used in their manufacture. The specified grain size used for the E-Rating is to be agreed upon between purchaser and supplier.

SDO ASTM: ASTM International
Document Number B930
Publication Date Sept. 1, 2021
Language en - English
Page Count 2
Revision Level 03(2021)
Supercedes
Committee B09.06
Publish Date Document Id Type View
Oct. 1, 2003 B0930-03 Revision
Sept. 1, 2021 B0930-03R21 Reaffirmation
April 1, 2017 B0930-03R17 Reaffirmation
Oct. 1, 2012 B0930-03R12 Reaffirmation
April 1, 2008 B0930-03R08 Reaffirmation