Quenched and tempered steel wire with excellent cold forging properties
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United States of America Patent
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Jun 22, 2004
Grant Date -
Apr 10, 2003
app pub date -
Sep 11, 2002
filing date -
Sep 14, 2001
priority date (Note) -
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Abstract
Steel wires and steel rods with excellent cold forging properties and used in a manufacture of various machine components, which have relatively high strengths, are disclosed. The steel wires are produced by maintaining a product (n.times.YS) of a yield strength (YS) and a work hardening coefficient (n) obtained by a tensile test of the steel wire within a range of 4.0-11.0 kgf/.sup.2, without a need of additional quenching and tempering treatments after cold forging. There is no need to perform heating for spheroidizing annealing for a long time, and it is possible to produce quenched and tempered steel wires having excellent cold forging properties by quenching and tempering treatments in a short period of time.
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