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See Chinese contents: GB/T 34889-2017 GB/T 34889-2017: Carburizing or carbonitriding, quenching and tempering of steel parts
This Standard specifies the technical requirements and methods for carburizing or carbonitriding, quenching and tempering of steel parts. This Standard is applicable to carburizing or carbonitriding, quenching and tempering of steel parts, and is not applicable to iron castings and powder metallurgy parts.
