Forging method
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United States of America Patent
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Jun 1, 2004
Grant Date -
Jun 13, 2002
app pub date -
Oct 12, 2001
filing date -
Oct 25, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The objective of the present invention is to provide a forging method that improves workability in machining, by turning the metallographical structure of products subject to impact load to a fine ferrite-perlite structure, without adopting the method of quenching and tempering, to obtain, as strength, a yield point (YP value) exceeding that obtained by the method of quenching and tempering, and making the tensile strength (TS) smaller compared with the method of quenching and tempering. A material to be forged has at least one kind of group 5 metal added thereto and is heated to a temperature suitable for hot forging. After forging to prescribed shape, cooling, and holding for a prescribed set time in a furnace at a tempering temperature, the material is further cooled to normal temperature by natural cooling.
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