Alloys or metallic compositions – Ferrous – Rare earth metal containing
Patent
1999-05-18
2000-11-21
Yee, Deborah
Alloys or metallic compositions
Ferrous
Rare earth metal containing
420112, 420 8, 420104, 420 89, 420123, 420125, 420127, 420128, 420129, 420 82, 420 84, 420122, 420126, C22C 3802, C22C 3846
Patent
active
061498629
ABSTRACT:
An alloy and alloy product has about 1.3% to 1.7% by weight concentration of silicon, along with iron, alloying elements, and inevitable impurities and exhibits improved resistance to hydrogen embrittlement and sulfide stress cracking in an intensive hydrogen-charged medium wherein H from the medium acts as an alloying element. The alloy is characterized by an Fe--Si--H system wherein Fe is a donor element with respect to Si and Si is an acceptor element with respect to Fe. Further, the alloying elements are Fe--Si noninteractive elements with respect to Fe and Si, such that the presence of the alloying elements are not donor or acceptor elements with respect to Fe or Si. In several alloy compositions, the alloy has between about 1.38% to 1.63% weight Si. The alloy may further include between about 0.10% to 0.25% weight of C. In one particular alloy, the alloy composition includes about 0.18% of C; although, in one alloy product, an alloy is used having about 0.16% to 0.24% weight of C. Further, in one or more alloy products, an alloy may have up to about 0.10% weight of at least one alloying element selected from the group consisting of Be, Mg, Al, Ca, Sc, Ti, V, Cr, Mm, Co, Ni, Cu, Zn, W, Mo, Ge, Se, Rb, Zr, Nb, Ru, Ag, Cd, La, Ce, Pr, Nd, Gd, Tb, Dy, Er, Re, Os, Pb, Bi, U, N and other REM.
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Gliklad Naum I.
Kuslitskiy Avgust B.
Kuslitskiy Leonid A.
The Atri Group Ltd.
Yee Deborah
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