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See Chinese contents: GB/T 38770-2020 GB/T 38770-2020: Spheroidite examination and grading for low and medium carbon steels
This Standard specifies structural examination and grading after spheroidizing annealing for low carbon steel, low carbon alloy steel, medium carbon steel, medium carbon alloy steel. This Standard is applicable to structural examination and grading before cold forming such as cold heading and cold extrusion and after spheroidizing annealing for low and medium carbon steels.
