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Seek the national standard GB4357 for carbon spring steel wire.

National standard GB4357-89 for carbon spring steel wire

_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ Publication date: February 20, 2005.

Main application: It is used to manufacture springs that are wound and formed in cold state without quenching.

Special purpose steel wire: (YB647 standard)

_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ Publication date: February 20, 2005. Source: Fangchun Information Network.

Special purpose steel wire: (YB647 standard) Group A: 0.2 mm-1.5 mm; Group b: 0.2 mm-1.5 mm; Group c: 0.2mm-1.5mm.

Main uses: manufacturing cold-rolled special springs without quenching.