In the use of industrial metal furnaces, we need to understand the furnace body heating charge information.
I master the chemical composition of all kinds of charges, and carefully and reasonably calculate the ingredients, and use a reasonable combination of all kinds of charges to achieve the main chemical composition in liquid steel to meet the requirements.
Today to share with you the knowledge of the charge.
The charge must be properly classified according to its chemical composition, impurity content and lumpiness size.
The size of charge lumpiness should be compatible with the frequency of power supply. The frequency of power supply for induction furnace decreases with the increase of furnace capacity.
Therefore, large capacity medium frequency furnace can use large charge, small capacity induction furnace use small charge. The distribution of induced current in a polymetallic conductor is subject to skin response.
The induced current in charge and liquid steel is attenuated from the surface to the center.
The induced current in the charge is mainly concentrated in the depth layer, and the heat of the hot charge is mainly supplied by the surface layer, so that the whole cross section of the charge can get the same temperature.
With the prolonging of heating time, the heat lost from the charge to the surrounding medium increases, thus the heat rate decreases.
If the penetration depth layer and the charge geometry fit properly, the heating time is short and the heat rate is high.
When adding the charge, we must pay attention to keep the charge clean. It is not good to have a dirty and miscellaneous charge.
The content of harmful impurity elements in the charge is as little as possible, not exceeding the standard, to avoid delaying the melting time due to the adjustment of the composition, due to the unqualified composition of the liquid steel scrap, increase material consumption, power consumption.
On the basis of making clear the composition of various charges, the ingredients should be calculated carefully. The removal of C star and increase of Si due to "self-boiling" in the later stage of smelting must be taken into account when mixing.
When charging, should check whether there are inflammable and explosive and other harmful goods mixed in the charge. If you find it, clear it immediately. It is forbidden to add cold material and wet material directly into the molten steel. After the melting liquid is filled with the upper part, it is forbidden to add large material to prevent capping.
Medium frequency induction furnace is made of copper tube wound induction coil in the outside of the furnace, the metal charge is installed in the furnace.
When the alternating current passes through the induction coil, the alternating magnetic flux is generated in the first ring, and the induced current is generated at a fixed depth on the surface of the charge through the closed metal charge, so that the charge is heated and melted.
It is strictly forbidden to mix iron filings and iron oxide when filling furnace and ramming crucible, and the ramming crucible must be compact.
This is our share today, I hope it can be helpful to you.
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