Historical
ISO 4967:1998
Steel - Determination of content of nonmetallic inclusions - Micrographic method using standard diagrams
This International Standard specifies a micrographic method of determining the nonmetallic inclusions in rolled or forged steel products having a reduction ratio of at least 3 using standard diagrams. 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.
This International Standard also provides for the determination of nonmetallic inclusions by image analysis technologies (see annex D).
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International Organization for Standardization [iso]