ASTM-B312 Standard Test Method for Green Strength of Specimens Compacted from Metal Powders

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Standard Test Method for Green Strength of Specimens Compacted from Metal Powders



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1.1 This test method covers determination of the green strength of unsintered compacted metal powder specimens by subjecting them to a uniformly increasing transverse loading under controlled conditions. The term green strength, as used herein, defines the stress, calculated from the flexure formula, required to break a specimen as a simple beam supported near the ends and applying the force midway between the fixed line center of the supports.

1.2 The values stated in inch-pound units are to be regarded as the standard. The SI equivalents are in parentheses and may be approximate.

1.3 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 test for green strength of a compacted metal powder is useful as a:

5.1.1 Method to relate the resistance of a pressed compact to breakage or damage due to handling.

5.1.2 Means of quality comparison of metal powder, lot to lot.

5.1.3 Method of determining the effect of additions to a base powder.

Significant variations in green strength will occur if the density tolerance of the pressed bar is exceeded.


constant loading beam device; green strength; P/M; powder metallurgy; unsintered compact; 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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Publication Date

April 7, 2020

Document Type

Test Method

Page Count

6 pages

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