The crucible working life is usually specified in terms of throughput, number of charges or working days. Depending on the working methods used, e.g. 1-, 2- or 3-shift operation, the crucible work- ing life will vary greatly. Very high casting temperatures above 1,600 °C reduce the working life by approx. 30% in comparison to the same furnace operated at 1,540 °C.
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