Application Technology of the Magnesium Cored Wire

1. The Amount of Magnesium in the Cored Wire

Magnesium powder is used to desulfurize molten steel. It is verified that magnesium is a good desulfurizer, and the highest desulfurization rate can reach 64.5%. With the increase of magnesium consumption, the desulfurization rate shows a downward trend. The reason is that with the increase of magnesium powder addition, the molten steel has a large splash, and the magnesium recovery rate drops sharply.

2. Desulfurization and Deoxidation

For the treatment of molten steel with magnesium-containing cored wire, controlling the oxygen content in the steel is a prerequisite for effective desulfurization according to the requirements of wire desulfurization.

3. Feed Thread Depth

In order to maximize the utilization of the alloy and make the best alloy cored wire, the wire feeding depth should be controlled appropriately.

4. Feeding Speed of Cored Wires of Different Specifications

It is very important to determine the appropriate parameters of the feeding speed. When the wire feeding speed is high, the core wire fed into the deep part of the ladle reacts too violently, causing molten steel to splash; when the speed is low, the cored wire is easy to burn on the surface of the molten steel, which affects the metallurgy.

5. Argon Blowing and Feed Line

It is generally believed that bottom-blown argon stirring while feeding the wire can promote the flow of molten steel and provide good kinetic conditions for desulfurization. However, in practice, the results of multiple heats are contrary to the above point of view. The experimental heat has severe fluctuations in the molten steel level, which affects the production operation, and the desulfurization effect is not ideal.

6. Desulfurization Rate and Temperature Drop

The production results show that the sulfur content w[S] before the converter tapping can be reduced from about 0.035% to less than 0.020% by using this process. The desulfurization rate can be high or low. The heats with low desulfurization rate are mainly due to the large amount of slag produced during the tapping process, which brings a large amount of converter final slag, resulting in the content of ladle top slag w (FeO) and molten steel too high, thereby reducing the desulfurization effect.

7. Social Benefits and Application Prospects

From the analysis of desulfurization thermodynamics, pre-desulfurization of molten iron in front of the furnace is more economical and feasible than molten steel desulfurization, but the slag must be removed after the molten iron feed line desulfurization, otherwise, the desulfurization will produce serious sulfur recovery in the converter's high oxidation atmosphere.

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