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See Chinese contents: GB/T 4172-2000 GB/T 4172-2000: Permanent magnetic material of rare earth cobalt
This Standard specifies the definitions, sizes, appearance, technical requirements, test methods, acceptance rules, as well as packaging, marking, quality certificate, etc. of the atmospheric corrosion resisting steel for welded structure. This Standard applies to the hot-rolled steel with atmospheric corrosion resistance for bridges, buildings and other structural members, including steel plates, steel strips and shaped steel, with a thickness of up to 100mm.
