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See Chinese contents: GB/T 33975-2017 GB/T 33975-2017: Hot-rolled spring steel wire rod for high-speed railway fastener
This Standard specifies the ordering content, dimension, shape, weight and tolerances, technical requirements, test methods, inspection rules, packaging, marking and quality certification of hot-rolled spring steel wire rod for high-speed railway fastener, This Standard applies to hot-rolled spring steel wire rod for high-speed railway fastener with a nominal diameter of 12 mm ~ 20 mm. This standard can be used as a reference for ordinary railways and heavy-load railways.
