Hot dip aluminum coated chromium alloy steel
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United States of America Patent
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May 26, 1992
Issued Date -
N/A
app pub date -
Aug 27, 1990
filing date -
Aug 29, 1988
priority date (Note) -
Expired
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Abstract
Continuous hot dip aluminum coated ferritic chromium alloy steel strip. Strip is cleaned by heating to a temperature no greater than about 650.degree. C. in a direct fired furnace. The cleaned strip is further heated in a protective atmosphere containing at least 95% by volume hydrogen, cooled in the protective hydrogen atmosphere to near or slightly above the melting point of an aluminum coating metal, and passed into a bath of the aluminum coating metal. The low direct fired furnace cleaning temperature and hydrogen protective atmosphere provides good wetting of a chromium alloy steel surface to prevent uncoated areas or pin holes in the aluminum coated layer.
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