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See Chinese contents: GB/T 28300-2012 GB/T 28300-2012: Surface quality classes for hot-rolled bars and rods technical delivery conditions
This Standard specifies the terms and definitions, code, requirements, test, modification, etc. for the surface quality of hot-rolled bars and rods. This Standard is applicable to the surface quality classes of hot-rolled bars and rods with nominal dimension of 5mm ~ 150mm. The hot-rolled bars and rods with nominal dimension greater than 150mm can also be applicable through the negotiation between the supplier and the purchaser.
