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See Chinese contents: GB/T 4357-1989 GB/T 4357-1989: [GB 14647-2008] Carbon spring steel wires
This Standard specifies the classification, dimension, shape, technical requirements, test methods, inspection rules, packaging, marking and quality certificate of carbon spring steel wires. This Standard applies to cold-drawn non-alloy steel wires for springs, with circular cross section, used for machinery.
