Cu-Ni-Si-based copper alloy sheet material and method of manufacturing same
A manufacturing method and technology of copper alloys, applied in electrical components, electrical solid devices, circuits, etc., can solve the problems of reduced stress relaxation resistance, no consideration of crack prevention, and difficulty in improving the pressing groove bending method, etc., to achieve excellent Effects of stress relaxation resistance and good bending workability
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[0125] Ingots having the compositions shown in Table 1 were cast using a vertical melting casting machine. With some exceptions for comparison, samples having a thickness of 50 mm (thickness: 180 mm) were cut out from ingots, and these samples were heated to 950° C. and subjected to hot rolling. Except for some comparative examples, the rolling schedule was set so that the rolling ratio in the temperature range of 950°C to 700°C was 60% or more, and rolling was also performed in the temperature range lower than 700°C. Except for some comparative examples, the final pass of hot rolling was set between 600°C and 400°C. The rolling rate from ingot casting to the end of hot rolling is about 90%. After hot rolling, the oxide film on the surface is removed by mechanical polishing (washing). Next, solution treatment was performed after cold rolling at various rolling ratios. During solution treatment, attach a thermocouple to the surface of the sample, continuously measure the cha...
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