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See Chinese contents: GB/T 41857-2022 GB/T 41857-2022: Sheet metal parts fabricated by fine blanking combined with extrusion process -- General specification
This document specifies the technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of sheet metal parts fabricated by fine blanking combined with extrusion process (hereinafter referred to as ¡°fine blanking extrusion parts¡±). This document applies to steel fine blanking extrusion parts fabricated by fine blanking combined with extrusion process.
