Quenching method and apparatus
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United States of America Patent
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Dec 12, 2006
Grant Date -
Mar 18, 2004
app pub date -
Nov 30, 2001
filing date -
Nov 30, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A hot object is quenched after heat treatment. A hot gas stream having at least 20% by volume of hydrogen is taken from for example a carburising chamber of a furnace. The gas is cooled by passage through a heat exchanger, and is compressed in a compressor. The compressor has an aftercooler (not shown) to remove heat of compression from the gas. The cooled, compressed gas flows through nozzles into a quenching chamber. The gas leaves the nozzles at a velocity of at least 50 m/s and impinges upon the hot metal object so as to effect its quenching.
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