Free carbon-free casting powder for ultra-low carbon steel automobile sheet

Abstract

The invention relates to free carbon-free casting powder for an ultra-low carbon steel automobile sheet. The casting powder comprises calcium, magnesium, strontium, barium, titanium, zirconium, chromium, manganese, aluminum, silicon, mixed or single rare earth oxide and CaF2, and the melting temperature of the obtained composite oxide or mixture is 1240-1300 DEG C. The slagging reaction temperature between the materials of the free carbon-free casting powder is high, so that the melting speed of the casting powder is controlled. In the melting process of the free carbon-free casting powder, the melt separation phenomenon is avoided, and the surface quality of a casting blank is good. The solubility of molten slag of the free carbon-free casting powder in water is low, and the environmental pollution is small. The free carbon-free casting powder uses little or no framework materials such as carbonaceous materials, so that the cost is reduced, and recarburization of molten steel is prevented. The free carbon-free casting powder does not contain Na2O, and can prevent the generation of'white spots' of a tin-plated steel plate. The free carbon-free casting powder can be applied to all types of steel, so that all the casting powder is changed from black to white, and the damage of carbon black to human health is prevented.

Description

technical field [0001] The invention relates to the field of mold slag for continuous casting in iron and steel smelting, in particular to a non-free carbon mold slag for ultra-low carbon steel automobile plates. Background technique [0002] During continuous casting, the mold slag is added to the mold and contacts the molten steel to form a molten layer, which undergoes a metallurgical reaction with the molten steel, resulting in the transfer of inclusions and migration of components. At the same time, the vibration of the mold and the fluctuation of the molten steel level will also cause The surface and the unmelted layer have an effect, and the characteristics of the mold flux directly affect the surface quality of the slab. When casting ultra-low carbon steel, the carbon-rich layer that exists between the liquid slag layer and the sintered layer during the use of mold slag in the mold is the main reason for the carbonization of ultra-low carbon steel. The thickness and...

AI Technical Summary

Problems solved by technology

[0016] (3) Affect the spreading performance of mold flux

In fact, the amount of mold slag carbon increase in this method is between 5-10ppm, and it can reach about 15ppm when the production is unstable. In order to ensure that the carbon content of the billet meets the standard, the RH decarburization is generally made below 10ppm, which prolongs the RH time and increases cost

Images