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JIS G 0555:2020

JIS G 0555:2020

$30.55

Microscopic testing method for the non-metallic inclusions in steel

Published By Publication Date Number of Pages
JIS 2020-06-22 51
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This Standard specifies a micrographic method of determining the non-metallic inclusions (hereafter referred to as inclusions) in rolled or forged steel products having a reduction ratio of at least 3 using standard diagrams and point counting method. This method is widely used to assess the suitability of a steel for a given use. However, since it is difficult to achieve reproducible results owing to the influence of the test operator, even with a large number of specimens, precautions should be taken when using the method.

NOTE 1 For certain types of steel (e.g. free cutting steels), the standardized diagrams described in this Standard may not be applicable.

This Standard also provides for the determination of non-metallic inclusions by image analysis technologies (see Annex D).

It also provides in Annex JA the method for assessing the cleanliness of steel by determining the type and number of inclusions in steel by means of a microscope.

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

ISO 4967:2013 Steel—Determination of content of nonmetallic inclusions— Micrographic method using standard diagrams (MOD)

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

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JIS G 0555:2020
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