| 摘要 |
PURPOSE:To smoothly carry out the high-speed continuous casting of steel and to improve the productivity by subjecting a Cu alloy ingot having a regulated composition to hot extrusion, cold working and heat treatment each under specified conditions so as to provide electric conductivity fit for electromagnetic agitation to the resulting material for a casting mold and to prevent the softening and deformation of the casting mold. CONSTITUTION:A Cu alloy ingot consisting of, by weight, 0.4-2.0% Ni, 0.1-0.4% Si, 0.05-1.0% Zn, 0.02-0.1% Mn, 0.001-0.1% in total of one or more among Mg, Cr, Zr and Ti and the balance Cu with inevitable impurities is hot extruded. At this time, the ingot is heated at >=200 deg.C/hr heating rate and hot extruded. It is then cooled from >=600 deg.C at >=5 deg.C/sec cooling rate, cold worked at 5-30% reduction of area and subjected to annealing at 600-800 deg.C and cooling at >=5 deg.C/sec cooling rate twice or more to obtain the titled material for a casting mold.
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