Alloys or metallic compositions – Ferrous – Chromium containing – but less than 9 percent
Reexamination Certificate
2004-12-07
2009-02-24
Yee, Deborah (Department: 1793)
Alloys or metallic compositions
Ferrous
Chromium containing, but less than 9 percent
C420S112000, C420S113000, C420S114000
Reexamination Certificate
active
07494618
ABSTRACT:
To provide an alloy tool steel having high-temperature strength at an operating temperature of the order of 700° C., while maintaining room-temperature strength as high as that of a conventional matrix high-speed tool steel. The steel contains from 0.45 wt % to 0.65 wt % C, from 0.10 wt % to 1.00 wt % Si, from 0.20 wt % to 2.00 wt % Mn, not more than 0.020 wt % P, not more than 0.015 wt % S, not more than 1.00 wt % Cu, not more than 1.00 wt % Ni, from 3.50 wt % to 5.00 wt % Cr, from 0.00 wt % to 3.00 wt % Mo, from 0.00 wt % to 10.00 wt % W, from 1.00 wt % to 2.00 wt % V, from 0.00 wt % to 8.00 wt % Co, not more than 0.10 wt % Al, not more than 0.01 wt % O, not more than 0.02 wt % N, and the balance substantially constituted of Fe and unavoidable impurities, in which Weq is from 2.0 to 10.0, 2Mo/Weq is not more than 0.60, and ΔC is from −0.3 to 0.0.
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Daido Tokushuko Kabushiki Kaisha
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Yee Deborah
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