Steel Wire for Cold Forging Having Excellent Low Temperature Impact Properties and Method of Producing the Same
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United States of America Patent
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Issued Date -
Nov 8, 2007
app pub date -
Nov 29, 2004
filing date -
Dec 18, 2003
priority date (Note) -
Abandoned
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Abstract
Disclosed is a steel wire for cold forging, which has excellent low temperature impact properties, and a method of producing the same. The steel wire consists of 0.10-0.40 wt % C, 1.0 wt % or less of Si, 0.30 -2.0 wt % Mn, 0.03 wt % or less of P, 0.03 wt % or less of S, and the balance of Fe and impurities. The steel wire has an austenite grain size of 5-20 .mu.m, impact absorption energy of 60 J/cm.sup.2 or more at -40.degree. C., and tensile strength of 70-130 kgf/mm.sup.2. A steel material for cold forming according present invention has impact toughness that is greatly superior to a conventional spheroidized material or non-heat treated steel at a low temperature of -40.degree. C.
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