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See Chinese contents: GB/T 20887.7-2017 GB/T 20887.7-2017: Continuously hot rolled high strength steel sheet and strip for automobile -- Part 7: Steels for hydraulic forming
This Part of GB/T 20887 specifies the terms and definitions, classification and designation, ordering content, dimensions, shapes, weights, technical requirements, test methods, inspection rules, packaging, marking and quality certification of continuously hot rolled high strength steel sheet and strip. This Part applies to steel strip of thickness not greater than 6 mm, and steel sheet transversely cut or steel strip longitudinally cut from steel strip, which are used for the structural parts of automobile such as auxiliary frames and dashboard supports.
