WIRE ROD AND STEEL WIRE FOR SPRINGS HAVING HIGH CORROSION RESISTANCE, METHOD OF MANUFACTURING STEEL WIRE FOR SPRINGS, AND METHOD OF MANUFACTURING SPRINGS
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United States of America Patent
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Issued Date -
Feb 12, 2015
app pub date -
Dec 20, 2012
filing date -
Dec 23, 2011
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Abandoned
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Abstract
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, 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% ore 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 steel wire having a tensile strength 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.
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