D.C. arc furnace having electrically conductive hearth and method for making same
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United States of America Patent
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Aug 1, 1989
Issued Date -
N/A
app pub date -
Mar 16, 1988
filing date -
Feb 21, 1985
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Expired
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Abstract
A new method of making an electrically conductive hearth in a d.c. furnace is effected by first heating bricks such as magnesite-graphite bricks and the like, from their new commercially available form to high temperatures decresing the normal resistivity of the bricks and thereafter laying the bricks to form the hearth from top to bottom with the heat treated bricks.
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