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See Chinese contents: GB/T 25744-2010 GB/T 25744-2010: Metallographic examination for carburizing quenching and tempering of steel parts
This standard specifies the method for the inspection of the carburizing quenching and tempering metallographic structure of steel parts, the level of the metallographic structure, the determination of the effective depth of hardened layer of the carburizing quenching. This standard is applicable to workpieces, whose effective hardened layer depth is greater than 0.3 mm by carburizing quenching.
