Patent ID: 6264716
Filing Date: 2001-07-24
Classification: B22D,C21C,F27D,Y02P

Abstract:
A process for stirring molten steel disposed within a container, comprising the steps of introducing argon gas into said container at a flow rate of from about 0.005 to about 0.2 cubic feet of argon per ton of said molten steel in said container per minute, measuring the extent to which said container is caused to vibrate because of the flow of said argon gas into said container, producing a multiplicity of analog signals corresponding to the rate of flow of said argon gas into said container, sampling said multiplicity of analog signals at a rate of at least 800 times per second, converting said analog signals to digital signals, transforming said digital signals by subjecting them to fast Fourier transformation, and evaluating said transformed digital signals, wherein the extent to which said container is caused to vibrate because of the flow of argon gas into said container is measured by a measuring means selected from the group consisting of a laser vibrometer and an integrated circuit piezoelectric accelerometer.