Heat treatment process for wire rods
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United States of America Patent
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Nov 26, 1996
Issued Date -
N/A
app pub date -
Jun 6, 1995
filing date -
Jul 28, 1992
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Abstract
A conveyor moves forward an unconcentrically spiralled loose coil of steel wire rod having a temperature not lower than Ar.sub.3 into a retention bath of molten salt for heat treatment. Just before entering the retention bath, the coil is quenched by spraying a solution of molten salt kept at a temperature between 400.degree. and 600.degree. C. and not higher than the temperature of the retention bath either from above and below or from only above the coil. Then, the quenched coil is retained in the retention bath of molten salt kept at a temperature between 400.degree. and 600.degree. C., thereby causing pearlite transformation and forming a fine pearlite structure in the wire rod.
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