Specialized metallurgical processes – compositions for use therei – Compositions – Solid treating composition for liquid metal or charge
Patent
1989-12-26
1990-09-11
Yee, Deborah
Specialized metallurgical processes, compositions for use therei
Compositions
Solid treating composition for liquid metal or charge
75537, 75310, 75315, 420415, 420129, C21C 706, C21C 7064
Patent
active
049560093
ABSTRACT:
A granular additive alloy designed for addition of calcium to molten steel to obtain maximum calcium effects with minimal additions, especially in steels which cannot tolerate the other elements commonly accompanying calcium additions. An alloy is described which contains a ratio of not more than 2.85:1 nor less than 0.35:1 calcium to aluminum, and can contain other reactive metals such as, but not limited to, rare earths, boron, titanium, and zirconium in amounts up to 40% by weight of the alloy. The preferred embodiment is an alloy with 60% by weight calcium and 40% by weight aluminum. The particles are intended to dissolve in the molten steel and form a boundary layer adjacent their surfaces. The particles are sized such that substantially all of the particle is consumed in the formation of this boundary layer, according to a given relationship based on the concentration of calcium and aluminum in the alloy.
REFERENCES:
patent: 2819956 (1958-01-01), Strauss
patent: 4035892 (1977-07-01), Ototani et al.
patent: 4286984 (1981-09-01), Luyckx
patent: 4671820 (1987-06-01), Ototani et al.
patent: 4698095 (1987-10-01), Ototani et al.
Friedman Barry I.
Reactive Metals and Alloys Corporation
Yee Deborah
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