FERRITIC HEAT-RESISTANT STEEL AND METHOD FOR PRODUCING IT
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United States of America Patent
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Issued Date -
Jan 31, 2002
app pub date -
Sep 21, 1998
filing date -
Sep 22, 1997
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Abstract
The invention provides a ferritic heat-resistant steel having excellent high-temperature oxidation resistance, especially excellent steam oxidation-resistant characteristics. In high-Cr ferritic heat-resistant steel, ultra-fine oxide particles having a size of not larger than 1 .mu.m are formed just below the oxide films and formed on the steel base, whereby the adhesiveness between the films and the base is enhanced. The ferritic heat-resistant steel contains Cr in an amount of from 8.0 to 13.0% by weight, and at least one of Rh and Ir in a total amount of from 0.3 to 5.0% by weight.
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