Rolled steel bar or rolled wire rod for cold-forged component
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United States of America Patent
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Nov 10, 2020
Grant Date -
Nov 2, 2017
app pub date -
Nov 13, 2015
filing date -
Nov 18, 2014
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Abstract
In a rolled steel bar or rolled wire rod for a cold-forged component having a predetermined chemical composition, Y1 represented by Y1=[Mn]×[Cr] and Y2 represented by Y2=0.134×(D/25.4−(0.50×√[C])/(0.50×√[C]) satisfy Y1>Y2, the tensile strength is 750 MPa or less, an internal structure is a ferrite-pearlite structure, and the ferrite fraction in the internal structure is 40% or greater.
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