Cr-Mo ALLOY STEEL COMPOSITION HAVING EXCELLENT HYDROGEN BRITTLENESS RESISTANCE AND METHOD FOR HEAT TREATMENT OF THE SAME
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United States of America Patent
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Issued Date -
Feb 19, 2015
app pub date -
Dec 20, 2013
filing date -
Aug 13, 2013
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Abandoned
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Abstract
Alloy steel compositions having improved resistance to hydrogen brittleness and methods of heat treating same are provided. The alloy steel compositions find applications in hydrogen storage containers, piping systems for hydrogen fuel cell vehicles, or reinforced boards for sound absorption/insulation on a multiple layers. The alloy steel compositions include 1.0 to 2.5% by weight of aluminum (Al), based on the total weight of the composition. Improved resistance to hydrogen brittleness is effected by stabilizing an inner part of the composition and forming an Al2O3 layer on a surface of the composition.
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