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Delayed mold addition practice

Figure 2. Delayed mold addition practice. The sketch depicts the moment at which teeming is resumed to fill the hot top volume after the mischmetal has been added all at once. This follows a 20-60-s hold of the ingot level at the hot junction to allow for the development of a solidified shell free of REM inclusions. Figure 2. Delayed mold addition practice. The sketch depicts the moment at which teeming is resumed to fill the hot top volume after the mischmetal has been added all at once. This follows a 20-60-s hold of the ingot level at the hot junction to allow for the development of a solidified shell free of REM inclusions.
REM Alloy Costs. For a typical North American sulfur specifics tion"Tfo7oT5 laax., a minimum retained REM content of O.OhS is required to insure full MnS substitution, i.e. a RE J/S ratio of minimum 3/1. Using the delayed mold addition practice with at least 75% recovery and mischmetal 5.30/lb the current cost of a typical treatment is ... [Pg.60]

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