Process and apparatus for heat treating steel using infrared radiation
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United States of America Patent
Stats
-
Oct 21, 1980
Grant Date -
N/A
app pub date -
Jul 27, 1979
filing date -
Jul 24, 1979
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Process and apparatus for stress relieving steel sheet, strip, strapping, wire and the like involves the use of high intensity shortwave infrared radiation to heat the steel to the desired stress relieve temperature. The apparatus comprises a furnace having opposing spaced-apart parallel banks of infrared radiation lamps. An electronic programmable controller controls the intensity of the lamps along the banks' length. A roller arrangement is used in passing such steel through the furnace. A device measures the linear speed of the steel. The controller adjusts lamp intensity, as determined by a program based on the signal received from the line speed measuring device. The controller, according to its program, maintains a minimum lamp intensity when the steel is stationary. The controller increases the lamp intensity to a predetermined level to preheat the steel to ensure on line start-up that the steel emerges at the desired stress relieve temperature. The responsiveness of the infrared heating unit provides significant advances in the art of stress relieving steel and economines.
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