ASTM-B930 Standard Test Method for Rating Grain Size and Frequency of Abnormally Large Grains in Cemented Tungsten Carbides (Hardmetals)

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

Significance and Use

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

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.


abnormally large grains; cemented carbides; cemented tungsten carbide; E-rating; hardmetals; L-rating; microstructure; ICS Number Code 77.160 (Powder metallurgy)

To find similar documents by ASTM Volume:

02.05 (Metallic and Inorganic Coatings; Metal Powders and Metal Powder Products)

To find similar documents by classification:

77.160 (Powder metallurgy Including sintered metal materials and hardmetals)

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Document Number


Revision Level

2003 R21 EDITION



Modification Type


Publication Date

Sept. 1, 2021

Document Type

Test Method

Page Count

2 pages

Committee Number