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JIS Z 2251-1:2020

JIS Z 2251-1:2020

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Knoop hardness test- Part 1: Test method

Published By Publication Date Number of Pages
JIS 2020-12-21 35
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This Standard specifies the Knoop hardness test method for metallic materials for test forces from 0.009 807 N to 19.613 N.

The Knoop hardness test specified in this Standard is for lengths of indentation diagonals 0.020 mm; it may be used for lengths of indentation diagonals < 0.020 mm upon agreement between the parties involved. ISO 14577-1 allows the determination of hardness from smaller indentations.

A periodic verification method is specified for routine checking of the testing machine in service by the user.

Special considerations for Knoop testing of metallic coatings can be found in ISO 4516.

NOTE 1 Using the method specified in this Standard for determination from indentations < 0.020 mm in diagonal length may cause large uncertainties in the results.

NOTE 2 The International Standard corresponding to this Standard and the symbol of degree of correspondence are as follows.

ISO 4545-1:2017 Metallic materials—Knoop hardness test—Part 1: Test method (MOD)

In addition, symbols which denote the degree of correspondence in the contents between the relevant International Standard and JIS are IDT (identical), MOD (modified), and NEQ (not equivalent) according to ISO/ IEC Guide 21-1.

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JIS Z 2251-1:2020
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