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See Chinese contents: GB/T 30834-2022 GB/T 30834-2022: Rating and classifying of inclusions in steel - Scanning electron microscope method
This document specifies the equipment for evaluating and classifying non-metallic inclusions in steel by scanning electron microscope (SEM), calibration and verification of equipment, sampling, specimen preparation, test procedures, inclusion classification, rating and statistics, test reports, precision and bias. This document recommends three inspection methods. Method 1 mainly classifies inclusions according to their morphology. Method 2 mainly classifies inclusions according to their chemical composition. Method 1 and Method 2 are suitable for microscopic evaluation of non-metallic inclusions larger than 2¦Ìm in rolled or forged steel with a compression ratio greater than or equal to 3. Method 3 is used to determine the specific details of a certain type of inclusion such as volume fraction, number fraction and other stereological parameters. It is suitable for the statistical classification of inclusions of all sizes (including below 2¦Ìm) in various slabs or steel products.
