High chromium ferritic heat resisting steel and method of heat treatment for the same
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United States of America Patent
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Issued Date -
Mar 21, 2002
app pub date -
Jan 8, 2001
filing date -
Jan 11, 2000
priority date (Note) -
Abandoned
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Abstract
High chromium ferritic steel containing chromium (Cr) in amount of 7.about.12 weight %, one or two elements of molybdenum (Mu) and tungsten (W) as a solid-solution strengthening element, and one or more of elements for forming a MX carbonitride(s) is heat-treated at a temperature higher than both solid-solution temperature of the element(s) for forming the MX carbonitride(s) and a precipitation starting temperature of 6 ferrite for 5 seconds or longer, cooled at a rate of 0.5.degree. C./s or faster, and subsequently tempered.
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