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See Chinese contents: GB/T 11251-2009 GB/T 11251-2009: Hot-rolled alloy structural steel plates
This standard specifies the order content, size, shape and allowable deviation, technical requirements, test methods, inspection rules, packaging, marking and quality certificate of hot-rolled alloy structural steel plates. This standard is applicable to hot-rolled alloy structural steel plates with a thickness greater than 4 mm ~ 30 mm.
