Method of producing forgings having excellent tensile strength and elongation from steel wire rods
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United States of America Patent
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Issued Date -
Oct 23, 2008
app pub date -
Apr 17, 2007
filing date -
Apr 17, 2007
priority date (Note) -
Abandoned
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Abstract
A method of producing forgings includes the steps of: forming forgings from a steel wire rod; heating the forgings to a temperature range of 830.about.900.degree. C.; subjecting the forgings to first tempering at a temperature range of 100.about.300.degree. C. after the heating at 830.about.900.degree. C.; and subjecting the forgings to second tempering at a temperature range of 300.about.400.degree. C, after the first tempering. In the first tempering, the forgings are quenched in a salt bath having a temperature in the range of 100.about.300.degree. C., and are tempered for 60.about.130 minutes. In the second tempering, the forgings are quenched in a salt bath having a temperature in the range of 300--400.degree. C., and are tempered for 30.about.150 minutes.
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