Specialized metallurgical processes – compositions for use therei – Processes – Electrothermic processes
Reexamination Certificate
2008-12-18
2011-12-27
Wyszomierski, George (Department: 1733)
Specialized metallurgical processes, compositions for use therei
Processes
Electrothermic processes
C075S306000, C075S309000, C075S329000, C075S652000
Reexamination Certificate
active
08083830
ABSTRACT:
An object of the invention is to make it possible to produce a copper alloy in which the S content is reduced with no contamination with Al, which has a good casting surface and good internal properties and in which eutectic compounds are refined. The invention relates to a slag for electroslag remelting for copper alloy, including CaF2: 20 to 45% by mass, CaO: 10 to 30% by mass, SiO2: 10 to 30% by mass, LiF: 10 to 20% by mass, and ZrO2: 5 to 15% by mass with other impurities: at most 1% by mass, and satisfying a formula:in-line-formulae description="In-line Formulae" end="lead"?17.0(LiF content+ZrO2content)−556≦CaF2content≦4.1(LiF content+ZrO2content)−80.9,in-line-formulae description="In-line Formulae" end="tail"?and the invention relates to a method for producing a copper alloy with the slag.
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Derwent Acc-No. 2003-078799 for patent family inlcuding 2002-239784 A published Aug. 28, 2002. Abstract.
International Search Report (PCT/ISA/210) dated Feb. 10, 2009, issued in PCT/JP2008/073108.
English Translation of Written Opinion (PCT/ISA/237) issued in PCT/JP2008/073108.
Mizusawa Mamoru
Tanaka Shinji
Yamada Hitohisa
McGuthry Banks Tima M
Sughrue & Mion, PLLC
The Japan Steel Works Ltd.
Wyszomierski George
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