High strength and high ductility steel wire and method for producing high strength and high ductility extra fine steel wire

摘要

A method of producing an ultrafine steel wire with a diameter of at most 0.4 mm and a tensile strength of at least 360 kgf/mm2, which comprises hot rolling and drawing, after subjecting to diffusion treatment if necessary, steel containing 0.91 to 1.00 wt % of carbon, at most 0.4 wt % of silicon, at most 0.5 wt % of manganese, 0.10 to 0.30 wt % of chromium, and the balance of iron and unavoidable impurities, subjecting to final patenting to attain a wire strength of 140 to 160 kgf/mm2, and further drawing the wire at a die angle of 8 to 12 DEG with a true strain of at least 3.50. IMAGE