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See Chinese contents: GB/T 35840.4-2020 GB/T 35840.4-2020: Steels for plastic mould -- Part 4: Pre-hardening steel plate
This Part of GB/T 35840 specifies the terms and definitions, order content, dimension, shape, weight, technical requirements, test methods, inspection rules, packaging, marking and quality certificate of pre-hardening steel plates for plastic mould. This Part is applicable to pre-hardening steel plates with a thickness of 10 mm ~ 300 mm for the manufacture of plastic moulds.
