PURPOSE: To control stably the melt level in a mold and to perform titled continuous casting by regulating the flow rate in the initial period when charging is started with a steel orifice mounted to the tip of an immersion nozzle made of refractories, melting the orifice by molten steel with time and expelling the air in the immersion nozzle in a short time right after starting of charging.
CONSTITUTION: A tundish stopper 6 is opened to start charging molten metal into a mold in order to start casting by using an immersion nozzle 5 made of refractories. The molten steel in the tundish 1 is charged into the mold 2 at the low flow rate throttled with a steel orifice block 9 having a small diameter. There is therefore no possibility of charging the molten steel at one time into the mold 2 in the stage of starting the casting, so that a good connection between a dummy bar head and a billet is obtd. The air in the nozzle 5 is substd. with the molten steel and the equil. state between the total head of the molten steel and the gaseous pressure is obtained in an extremely short time in order to maintain a stopper 6 in the intermediate casting state. The block 9 is melted by the molten steel flowing downward so that the bore thereof is gradually expanded until finally the block is thoroughly melted and the stable operation is started.
HIRATA KATSUMI
IDEGAMI KAZUO
SUZUKI SEISHIROU
MITSUBISHI STEEL MFG
| JPS50137828A | 1975-11-01 | |||
| JPS4994523A | 1974-09-07 | |||
| JPS5528095B2 | 1980-07-25 |