1. What is the significance of the decarburization reaction for the steelmaking process?

1 The carbon in the molten iron is oxidized by the decarburization reaction to be close to or equal to the specification of the carbon in the molten steel at the time of tapping.

2 The cyclic agitation of the molten pool

3 The CO produced is necessary to remove the gas in the steel.

4 is conducive to the elimination of non-metallic inclusions in steel.

5 provides a heat source for the steelmaking reaction.

6 is conducive to the reaction between the slag steel in the blowing process.

2. Why do steel making slag?

The refining of steel must first be refined, and the completion of all steelmaking tasks is almost related to slag.

1 The purpose of steelmaking slag is to remove the harmful elements in the steel P, S

2 steel slag covering the surface of the molten steel, to protect the molten steel from excessive oxidation, not to absorb harmful gases, heat preservation, and reduce the burning of beneficial elements.

3 absorbs the floating inclusions and reaction products.

4 to ensure that the carbon and oxygen reaction proceeds smoothly.

5 can reduce the lining erosion.

3. What is the relationship between aluminum and steel properties?

Aluminum is added to steel as a deoxidizer or alloying element. Aluminum deoxidation ability is much stronger than silicon and manganese. The main role of aluminum in steel is to refine grains and fix nitrogen in steel, thereby significantly improving the impact toughness of steel and reducing the tendency of cold and brittleness and aging tendency. Aluminum can also improve the corrosion resistance of steel, especially when used in combination with molybdenum, copper, silicon, chromium and other elements.

4. What effect does oxygen have on the properties of steel?

The solubility of oxygen in solid iron is small, mainly in the form of oxide inclusions. Therefore, the inclusions in the steel are mostly oxides except for a part of the sulfide. Non-metallic inclusions are the main source of steel damage, and have significant adverse effects on the fatigue strength, processability, ductility, toughness, weldability, HIC resistance, and corrosion resistance of steel. The oxygen content is high, and the continuous casting slab also produces defects such as subcutaneous bubbles, which deteriorates the surface quality of the continuous casting blank.

5. Why do you want to stop the slag tapping?

Less slag or slag tapping is one of the necessary means to produce pure steel. Its purpose is to facilitate accurate control of molten steel composition, effectively reduce the return of phosphorus to molten steel, increase the absorption rate of alloying elements, and reduce alloy consumption. It is beneficial to reduce the content of inclusions in steel and improve the scouring effect of ladle. It is also beneficial to reduce the corrosion of ladle refractories. At the same time, it also improves the life of the converter tap.