Ladle modification agent

Ladle modification agent

Brief introduction to the advantages of ladle modification:

There are two kinds of preparation for ladle modification: block and powder. The main components are al and metal oxide. There are usually two ways of ladle reforming, one is slag dilution method, that is, adding premelted synthetic slag in the tapping process, and then flushing with molten steel to complete slag reforming and desulfurization of molten steel. The second is slag reduction, that is, CaO + Al and Al2O3 + SiO2 + Al are added after tapping to complete slag transformation. Among them, there are * methods, which are very conducive to deep dephosphorization of P and s, stable al yield and simple operation* The results show that the strong reducibility of Al in the preparation can reduce the unstable oxides such as FeO and MnO in ladle slag, and reduce the oxidizability of ladle slag; At the same time, due to the deoxidation effect of the modified agent, the loss of acid molten aluminum in aluminum wire and molten steel during refining is avoided; In addition, the atmosphere of high temperature, high alkalinity and low oxidation is conducive to the removal of S. the deoxidation of the modified agent can reduce the unstable oxides such as FeO and MnO. The ladle slag is modified to form a low oxidation environment, which is very conducive to the deep removal of S and can give full play to the function of ladle refining.

The main effects of ladle modifier on the mechanical properties of steel are summarized:

1. Strength refers to the ability of a material to resist deformation or fracture. There are two types: yield strength σ b. Tensile strength σ s。 The strength index is an important index to measure the structural steel. The higher the strength, the greater the load the steel bears;

2. Hardness refers to the ability of the material surface to resist the pressure of hard objects. There are three common types: Brinell hardness HBS, Rockwell hardness HRC, Vickers hardness HV. Hardness is an index to measure the surface deformation ability of steel. The higher the hardness, the better the wear resistance of steel; It is not easy to wear.

Advantages of ladle modification

1. Create conditions for LF furnace smelting ultra low sulfur steel

In order to ensure that the sulfur content at the end of LF refining is less than the original target value, it is necessary to control the original sulfur content of slag and liquid steel, and the control of the original sulfur content of liquid steel should be completed before lf entering the station, which not only requires strict control of sulfur content in steel in converter, but also requires partial desulfurization during tapping and transportation, Ladle slag modifier can meet this requirement.

2. Realize LF refining forward

Through the ladle slag modification during tapping, the slag making process in the early stage of LF refining is transferred to the process of converter tapping and ladle transportation, and the white slag making process in the early stage of LF is partially realized, which is of great significance for LF * production.

3. Purifying molten steel

After the ladle slag is modified, the top slag of ladle has high reducibility, which can achieve certain deoxidation and desulfurization and remove inclusions in steel.

4. Shorten refining time

Using ladle slag modifier can obviously shorten the smelting cycle of LF furnace. Because of the shortening of smelting cycle, the power on time of LF furnace is reduced, which is also beneficial to reduce the power consumption, power consumption and refractory consumption of LF furnace.

Main properties of ladle modifier:

1. Reduce the content of gas and inclusion in molten steel.

2. Adjust slag and molten slag to reduce steel slag, purify molten steel and improve the purity of molten steel.

3. Deoxidize the molten steel to prevent secondary oxidation with high deoxidation rate. The ladle slag in Tian'e county should be changed into preparation to change the concentration of molten steel.

4. Reduce the consumption of alloy, change the picture and quotation of ladle slag, and effectively improve the recovery rate of alloy.

5. Effectively adjust the properties of slag layer and basicity of steelmaking slag to make the inclusions in molten steel float and form slag.