Metal founding – Process – Shaping liquid metal against a forming surface
Reexamination Certificate
2011-06-28
2011-06-28
Kerns, Kevin P (Department: 1735)
Metal founding
Process
Shaping liquid metal against a forming surface
C164S494000, C164S497000, C164S512000, C164S513000, C075S010150, C075S010180
Reexamination Certificate
active
07967057
ABSTRACT:
There is described a method for producing ultrahigh-purity Fe-base, Ni-base, and Co-base alloying materials to achieve impurity levels of (C+O+N+S+P)<100 ppm, and Ca<10 ppm, in the form of a large ingot, using a refining flux while forcibly cooling the crucible. A refining flux selected from the group consisting of metal elements of the Groups IA, IIA, and IIIA of the Periodic Table, oxides thereof, halides thereof, and mixtures thereof, is added to the molten metal during primary melting and the molten metal is held in contact with the refining flux for at least 5 minutes before tapping. Thereafter, the molten metal is caused to undergo solidification inside a mold, thereby producing a primary ingot. Subsequently, secondary melting is executed by an electron-beam melting method whereby while the primary ingot is sequentially melted in a water-cooled copper mold at a low pressure, the molten metal as-solidified state is pulled out from an outlet side of the water-cooled copper mold, thereby forming an ingot product.
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Kiuchi Kiyoshi
Kunii Kazutaka
Kusamichi Tatsuhiko
Nakayama Jumpei
(Kobe Steel, Ltd.)
Kerns Kevin P
Oblon, Spivak McClelland, Maier & Neustadt, L.L.P.
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