GB/T 30834-2022: Rating and classifying of inclusions in steel - Scanning electron microscope method

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Scope

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 2μm 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 2μm) in various slabs or steel products.

Basic Data

Standard ID	GB/T 30834-2022 (GB/T30834-2022)
Description (Translated English)	Rating and classifying of inclusions in steel - Scanning electron microscope method
Sector / Industry	National Standard (Recommended)
Classification of Chinese Standard	H24
Word Count Estimation	26,275
Issuing agency(ies)	State Administration for Market Regulation, China National Standardization Administration