ROD WIRE AND STEEL WIRE FOR A SPRING HAVING SUPERIOR CORROSION RESISTANCE, STEEL WIRE FOR A SPRING, AND METHOD FOR MANUFACTURING SPRING

摘要

Provided is a rod wire and a steel wire for a spring having superior corrosion resistance, the rod wire and the steel wire comprising, by weight %, 0.45 to 0.6% of C, 1.0 to 3.0% of Si, 17.0 to 25.0% of Mn, the remainder being Fe and other inevitable impurities. Also provided is a method for manufacturing a steel wire for a spring having superior corrosion resistance by drawing the rod wire, the steel wire having a tensile strength of 1800 to 2100 MPa and a reduction of area of 25% or more. Also provided is a method for manufacturing a spring having superior corrosion resistance, comprising the steps of: drawing the rod wire so as to obtain a steel wire having a tensile strength of 1800 to 2100 MPa and a reduction of area of 25% or more; and a step of cold-forming the steel wire at room temperature. According to the present invention, the necessity of using expensive alloy elements is eliminated, and a QT heat-treatment process and a surface ferrite decarburization process are omitted to reduce costs, and a rod wire for a spring, a steel wire for a spring, and a spring having superior corrosion characteristics may be obtained.