| 摘要 |
<p>Casting side dam apparatus for use in a twin-belt continuous casting machine of the type wherein two spacedapart 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 berylliumcopper alloy also comprising nickel, the beryllium being present in the alloy in excess of a trace but not more than 0.6% of the alloy, and the nickel in amount greater than the beryllium but not more than 2.1% of the alloy. The total of beryllium plus nickel plus copper is 99.5% minimum. The alloy is characterized by hardness in excess of the recommended minimum of 90 Rockwell B and conductivity in excess of the recommended minimum of 35% IACS. The dam blocks are resistant to intergranular cracking over a prolonged period of exposure to elevated temperature as high as about 800.degree.F., which is an elevated temperature to which the dam blocks are subjected in the operation of the Hazelett twin-belt casting machine for continuously casting copper. The dam blocks also are characterized by retaining their hardness in excess of 90 Rockwell B and conductivity in excess of 35% IACS over a prolonged period of exposure to the elevated temperature as high as about 800.degree.F.</p> |
