Metallurgical apparatus – Process
Patent
1993-05-11
1994-07-19
Kastler, Scott
Metallurgical apparatus
Process
266100, 266220, B22D 4158
Patent
active
053301609
ABSTRACT:
A gas stirring plug for introducing gas into a mass of molten metal. The plug is a generally frusto-conical shaped member which is worn away during use and which should be replaced when it has worn away to a predetermined point and comprises a shell, a core, and a low melting point component disposed within a cavity in the core. The core is located within the shell and is comprised of a refractory material extending between the bottom end and the top end of the plug. The cavity is of a predetermined height and has a bottom located a first predetermined distance above the bottom end of the plug. The cavity is filled with the low melting point component, e.g., soapstone, calcium silicate, talcum, or some other material having a melting point lower than steel, from its bottom to an intermediate point located a predetermined height above the bottom of the cavity. Mortar or some other high melting point refractory component is disposed in the cavity from the intermediate point to the top of the plug. The device is operative so that when it has worn away to the intermediate point the low melting point component will be exposed to the molten metal, whereupon it will melt and flow out the cavity and molten metal flows will flow therein to provide a predetermined visual appearance, e.g., a glowing dot surrounded by a darker area. That predetermined visual appearance changes, e.g., the glowing dot disappears, when the plug has worn away to the bottom of the cavity, thereby indicating that it should be replaced.
REFERENCES:
patent: 4749172 (1988-06-01), Detalle et al.
patent: 4971295 (1990-11-01), Rothfuss et al.
patent: 5007366 (1991-04-01), Handler
patent: 5202079 (1993-04-01), Winkelmann et al.
Eisermann Eckehard
Mascara Robert
Kastler Scott
Martin & Pagenstecher, Inc.
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