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See Chinese contents: GB/T 4697-2017 GB/T 4697-2017: Hot rolled steel section for mine timbering
This Standard specifies the ordering content, dimensions, shape, weight and tolerances, technical requirements, test methods, inspection rules, packaging, marking and certification of hot rolled U- and I-type steel section for mine timbering. This Standard applies to hot rolled U- and I-type steel section for mine timbering.
