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See Chinese contents: GB/T 40304-2021 GB/T 40304-2021: Determination of content of nonmetallic inclusions in steel -- Billet full section method
This Document specifies the principles, specimen preparation, test equipment, test methods and test reports for the content of non-metallic inclusions in billets. This Document is applicable to the test of non-metallic inclusions (with dimensions no less than 30??m) in billets that have not been rolled, deformed or otherwise treated. Non-metallic inclusions with a size less than 30??m can also be used for reference when the equipment allows.
