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ASTM E930-99(2007)

Historical Reaffirmation

Standard Test Methods for Estimating the Largest Grain Observed in a Metallographic Section (ALA Grain Size)

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1.1 These test methods describe simple manual procedures for measuring the size of the largest grain cross-section observed on a metallographically prepared plane section.

1.2 These test methods shall only be valid for microstructures containing outlier coarse grains, where their population is too sparse for grain size determination by Test Methods E 112.

1.3 This standard does not purport to address all of the safety problems, 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.


The presence of large grains has been correlated with anomalous mechanical behavior in, for example, crack initiation, crack propagation, and fatigue. Thus there is engineering justification for reporting the ALA grain size.

These methods shall only be used with the presence of outlier coarse grains, 3 or more ASTM grain size numbers larger than the rest of the microstructure and comprising 5 % or less of the specimen area. A typical example is shown in Annex A1 as Fig. A1.1.

These methods shall not be used for the determination of average grain size, which is treated in Test Methods E 112. Examples of microstructures that do not qualify for ALA treatment are shown in Annex A1 as Fig. A1.2, Fig. A1.3, and Fig. A1.4.

These methods may be applied in the characterization of duplex grain sizes, as instructed in the procedures for Test Methods E 1181.

SDO ASTM: ASTM International
Document Number E930
Publication Date Oct. 1, 2007
Language en - English
Page Count 6
Revision Level 99(2007)
Supercedes
Committee E04.08
Publish Date Document Id Type View
Dec. 1, 2018 E0930-18 Revision
April 10, 1999 E0930-99 Revision
Oct. 1, 2015 E0930-99R15 Reaffirmation
Oct. 1, 2007 E0930-99R07 Reaffirmation