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See Chinese contents: GB/T 20564.1-2017 GB/T 20564.1-2017: Continuously cold rolled high strength steel sheet and strip for automobile -- Part 1: Bake hardening steel
This Part of GB/T 20564 specifies the terms and definitions, classification and grade expression method, dimension, shape, weight, technical requirements, test methods, inspection rules, package, marking and quality certificate of cold rolled bake hardening high strength steel sheet and strip.
