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See Chinese contents: YB/T 091-2019 YB/T 091-2019: Forging (rolling) steel grinding balls
This standard specifies the terms and definitions, classification and code, technical requirements, test methods, inspection rules, packaging, marking, transportation, storage of forging (rolling) steel balls. This standard applies to forging (rolling) steel balls, which are used as grinding media in ball mills, semi-autogenous mills, etc.
