Tundish for molten alloy containing dense, undissolved alloying ingredient

• Main Authors: HOWARD M. PIELET, JOHN R. KNOEPKE, MASOOD A. TINDYALA, WILLIAM J. KREEVICH
• Format: Patent
• Language: English
• Published: 07.07.1994
• Edition: 5
• Subjects: CASTING; CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES; PERFORMING OPERATIONS; POWDER METALLURGY; TRANSPORTING

A tundish (10) has an entry location for receiving a molten alloy, such as steel, and bottom outlet openings (23) for withdrawing the molten alloy. The tundish bottom comprises a sump (26) located downstream of the inlet location and upstream of the outlet openings (23). Undissolved, molten alloying ingredient, denser than the molten alloy as whole, (e.g. lead or bismuth in the case of molten steel) accumulates in the sump. The sump (26) has a floor and passageways which extend downwardly from the sump floor (27) to a drain in the steel tundish shell underlying the sump. The passageways are permeable to undissolved, molten alloying ingredient but impermeable to the molten alloy. There are expedients for maintaining the passageways at a temperature which prevents undissolved alloying ingredient descending through the passageways from cooling to a temperature at which the undissolved alloying ingredient blocks the passageways against further passage by undissolved, molten alloying ingredient.