High Chromium Ferritic Steel With 0.5 Atomic % Hafnium, Part Of Which Is Ion Implanted
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Issued Date -
Oct 2, 2008
app pub date -
Apr 1, 2005
filing date -
Apr 2, 2004
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Abandoned
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Abstract
The application relates to the problem of improving the corrosion resistance and creep properties of standard Cr-steels like E911 (table 1) at high temperatures. To solve this problem, a method of adding up to 0.5 atomic % Hf both during casting or molding and by ion implantation is provided. The addition of Hf improves the corrosion resistance and creep properties inter alia, as it forms a finely distributed stable second phase and as the harmful M23C6 disappears, because all carbon is taken by Hf to form HfC.
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