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See Chinese contents: GB/T 224-2019 GB/T 224-2019: Determination of the depth of decarburization of steels
This Standard specifies requirements for sampling, determination method and test report of steel decarburization. This Standard is applicable to measuring depths of decarburization of steel (blank) and its parts. The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
