Specialized metallurgical processes – compositions for use therei – Compositions – Loose particulate mixture containing metal particles
Reexamination Certificate
2007-06-05
2007-06-05
Yee, Deborah (Department: 1742)
Specialized metallurgical processes, compositions for use therei
Compositions
Loose particulate mixture containing metal particles
C075S303000, C075S305000, C075S312000, C075S507000, C075S352000, C148S637000, C420S590000, C420S129000
Reexamination Certificate
active
10182237
ABSTRACT:
The present invention relates to a method for grain refining of steel. A grain refining alloy having a composition FeXY where X is one or more elements selected from the group consisting of Cr, Mn, Si, Ni, and Mo and where Y is one or more oxide and/or sulphide and or nitride and/or carbide forming elements selected from the group consisting of Ce, La, Nd, Pr, Ti, Al, Zr, Ca, Ba, Sr, Mg, C and N where X is between 0.001 and 99% by weight based on the weight of the alloy and where Y is between 0.001 and 50% by weight of the alloy, said alloy additionally containing between 0.001 and 2% by weight of oxygen and/or between 0.001 and 2% by weight of sulphur, said alloy containing at least 103inclusion particles per mm3consisting of oxides and/or sulphides and/or carbides and/or nitrides of one or more of the Y elements and/or one or more of the X elements Cr, Mn and Si in addition to Fe, said inclusion particles having a mean diameter of less than 10 μm, is added to molten steel in an amount of between 0.01 and 5% by weight based on the weight of the steel, whereafter the steel is cast. The invention further relates to a grain refining alloy for steel and to a method for producing grain refining alloys.
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Stahlschlussel, 14. vollstandig neu bearbeitete und erweiterte Auflage, pp. 271-272, 1986.
Grong Oystein
Klevan Ole Svein
Elkem ASA
Lucas & Mercanti LLP
Yee Deborah
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