Observation method of B-type inclusion behaviors in aluminum killed steel

Abstract

The invention relates to the technical field of metallurgy, particularly to an observation method of B-type inclusion behaviors in aluminum killed steel. The method comprises the steps as follows: preparing an aluminum killed steel sample, and performing coarse grinding, fine grinding, polishing and cleaning on the surface of the sample; placing the sample in a metallographic heating furnace of a high-temperature laser confocal microscopic; performing vacuum pumping treatment on the metallographic heating furnace and then feeding an inert gas continuously; performing radiation heating and real-time temperature measurement on the sample; heating the sample to 1550-1600 DEG C, keeping the sample at the constant temperature for 120-600 s, and then continuously cooling the sample at the speed of 0.2-1 DEG C / s; irradiating the surface of the aluminum killed steel sample by a laser beam, and performing high-speed scanning and observation on the surface of molten steel in the cooling process by the high-temperature laser confocal microscopic. With the adoption of the observation method of the B-type inclusion behaviors in the aluminum killed steel, the forming process of B-type inclusions in the aluminum killed steel can be observed clearly and conveniently, and a basis is provided for the research and the control on the B-type inclusions in the aluminum killed steel.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to an observation method for the behavior of B-type inclusions in aluminum-killed steel. Background technique [0002] Exceeding the standard of type B inclusions is a common problem faced by current medium and heavy plate enterprises. At present, the non-compliance rate of inclusions in the pipeline steel of enterprises with the best control level is as high as about 2%, among which CaO-Al is mainly 2 o 3 Department of B-type inclusions. The existence of B-type inclusions in aluminum-killed steel is inseparable from the steelmaking and refining processes commonly used at present. In order to control the cleanliness of molten steel, aluminum with strong deoxidation ability is mainly used for deoxidation in steelmaking, and the aluminum oxide inclusions formed are very easy. Sticking to the side wall of the nozzle, causing blockage. In order to avoid alumina sticking and plugg...

AI Technical Summary

Problems solved by technology

At present, due to the unclear formation mechanism of B-type inclusions, it is difficult to effectively observe the formation of B-type inclusions, so the control effect on B-type inclusions in aluminum-killed steel is poor

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