公开(公告)号：US4695318A

公开(公告)日：1987-09-22

申请号：US917864

申请日：1986-10-14

申请人： William F. Knauss, Jr. ,  Uday B. Pal ,  Balaji V. Patil

发明人： William F. Knauss, Jr. ,  Uday B. Pal ,  Balaji V. Patil

IPC分类号： B22D1/00 ,  C21C1/00 ,  C21C5/28 ,  C21C7/072 ,  C21C7/076 ,  C22C33/00 ,  C21C7/02

CPC分类号： C21C5/28 ,  C21C1/00 ,  C21C7/076 ,  Y02P10/242

摘要： There is practiced a method of making low carbon silicon steel in which the lining of the ladle is made of dolomite instead of fireclay or alumina, and there is added to the ladle, before the metal is teemed into it, a pre-melted or pre-fused mixture containing appropriate portions of calcium silicate, lime, magnesia, and spar, and argon bubbling is practice as before but preferably for a slightly longer period of time, and the ladle is provided during argon bubbling with a hood or lid. There is then obtained a product steel with desirably low contents of oxygen and nitrogen, and without penalty in the form of higher contents of aluminum and titanium in the finished steel.

公开(公告)号：US4733853A

公开(公告)日：1988-03-29

申请号：US15418

申请日：1987-02-17

申请人： Uday B. Pal ,  William F. Knauss, Jr.

发明人： Uday B. Pal ,  William F. Knauss, Jr.

IPC分类号： C21C5/46 ,  C21C5/42

CPC分类号： C21C5/4653

摘要： A taphole structure for BOF vessels that will prevent slag entrapment through vortexing and allow most of the metal to be tapped free of slag. This is accomplished through the use of a refractory member of generally tubular configuration which extends through the sidewall of the BOF vesssel and has a closed end portion extending into the vessel. The sidewall openings are provided in the tubular refractory member closely adjacent its closed end such that the molten metal will not flow directly into the end of the tubular refractory member but rather will flow into the refractory member through the sidewall openings, thereby creating an irrotational flow of metal into the tubular structure in the last stages of tapping without vortexing.