B - Operations – Transporting – 22 – D
Patent
B - Operations, Transporting
22
D
22/53, 75/70
B22D 11/06 (2006.01)
Patent
CA 1148717
ABSTRACT OF THE DISCLOSURE Casting side dam apparatus for use in a twin-belt continuous casting machine of the type wherein two spaced- apart side dams each revolve in a loop traveling along a casting zone from the input end to the output end of the casting zone and between a pair of revolving spaced-apart casting belts. The side dams return from the output end to the input end of the casting zone along a return path located away from the casting zone. The side dams each comprise a multiplicity of slotted dam blocks strung on a flexible metal band. The dam blocks are each formed of a beryllium- copper alloy also comprising cobalt, the beryllium being present in the alloy in excess of a trace but not more than 0.7% of the alloy, and the cobalt in amount greater than the beryllium but not more than 2.7% of the alloy. The total of beryllium plus cobalt plus copper is 99.5% minimum. The alloy is characterized in the solution heat treated and precipitated condition by hardness in excess of the recom- mended minimum of 90 Rockwell B and conductivity in excess of the recommended minimum of 35% IACS. The dam blocks are resistant to intergranular cracking and chipping over a prolonged discontinuous, cumulative period of exposure, equiv- alent to in excess of 20,000 tons of copper cast, to thermal cycling between temperatures ranging between about 800°F. and about 300°F. The dam blocks also are characterized by re- taining their hardness in excess of 90 Rockwell B and conductivity in excess of 35% IACS over a prolonged period of such thermal cycling between the upper and lower tempera- tures set forth immediately above.
364769
Kranz Paul J.
Scroggins Lloyd A.
Asarco Incorporated
Hewitt Neville S.
LandOfFree
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