BS ISO 22394:2010 - Hardmetals. Knoop hardness test – BSI British Standards

BS ISO 22394:2010

Hardmetals. Knoop hardness test

Status : Current   Published : April 2010



BS ISO 22394:2010 Hardmetals. Knoop hardness test

Many metallurgical problems require the determination of hardness over very small areas.

The special shape of the Knoop indenter makes it possible to place indentations much closer together than with a square Vickers indentation, e.g. to measure a steep hardness gradient.

For a given long diagonal length, the depth and area of the Knoop indentation are known to be only 15 % of what they would be for a Vickers indentation with the same diagonal length.

Both Vickers and Knoop hardness tests were performed for a range of hardmetals, in order to investigate whether a specific International Standard is really required and if it compensates the limitations of the Vickers hardness test currently used. Knoop hardness tests were carried out independently in three institutes (KATS, Jinil Co., Seoul University) over a period of four months.

The results of this test showed that a new International Standard regarding the Knoop hardness test was necessary.

BS ISO 22394 is the resulting international standard. it specifies the method of the Knoop hardness test for hardmetals.

Contents of BS ISO 22394;

1 Scope
2 Normative references
3 Principle
4 Symbols and designations
5 Apparatus
6 Test pieces
7 Procedure
8 Expression of results
9 Test report
10 Significance
Annex A (informative) Investigation regarding the demand of an International Standard for a Knoop hardness test for hardmetals
Annex B (informative) Comparison of important test procedures in Vickers and Knoop hardness tests


Standard NumberBS ISO 22394:2010
TitleHardmetals. Knoop hardness test
Publication Date30 April 2010
Normative References(Required to achieve compliance to this standard)ISO 4545-1, ISO 4545-2, ISO 4545-4
Informative References(Provided for Information)ISO 6507-1, ISO 3878
International RelationshipsISO 22394:2010
Draft Superseded By09/30194594 DC
DescriptorsHardmetals, Powder metallurgy, Knoop hardness measurement, Hardness measurement, Hardness testing, Test specimens, Test equipment
Title in FrenchMétaux-durs. Essai de dureté Knoop
Title in GermanHartmetalle. Knoop Härtetest
ISBN978 0 580 65692 7
File Size1.481 MB

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