| Steel wire is characterized by properties of high strength and good ductility. The factors which influence on strength and ductility in steel wire, are chemical composition, heat treatment and cold working. In regard to chemical composition, the steel wire having higher carbon and manganese contents comes to be demanded to get high strength and elasticity. Recently the behaviour of N, H and O in steel wire comes to be attached importance. In regard to heat treatment, patenting is general for steel wire before drawing. Recently direct patenting, batch patenting and fluidized bed patenting are being applied practically to increase productivity, improve quality and reduce manufacturing cost. For steel wire like PC wire, blueing and stabilizing after drawing are applied practically. In regard to cold working, a part of die drawing is gradually shifting to dieless drawing. Namely, rolling is used practically for drawing profile wire and alternate bending continuous drawing is being developed. Recently the ageing of steel wire, that was liable to be passed over before now, is studied and has come to be made clear. |
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