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Technical steps of steel making in induction furnace


Induction furnace is widely used in metallurgy, casting and other industries because of its short melting time, power saving and high degree of automation.

Induction furnace is suitable for smelting high quality steel and alloy with high quality raw materials, but there are also many problems that need to be paid attention to in the smelting process. The following is a small edition of Red Teng for you to introduce what steps induction furnace steel making technology has.

Charge selection

The main raw materials of smelting are scrap steel and a part of pig iron. The scrap steel and return charge, in addition to the chemical composition to meet the requirements, should also have the appropriate size, so that the charge can be heated effectively. For this purpose, some scraps can also be used to fill the void, in order to improve the density of the furnace in the crucible. When a molten pool is formed at the bottom of the crucible, the size of the charge has no effect on the heating effect.


Because there is no oxidation period during melting, the element burns less and can be accurately mixed. Alloy material that is not easy to oxidize, such as nickel, ferro molybdenum, can be added at the same time with scrap steel. In order to improve productivity, reduce the hydrogen content in steel, and avoid the explosion of scrap steel containing moisture or grease when heating in the furnace, scrap steel can be preheated to below 550℃, preheating temperature is too high will cause serious oxidation of furnace charge, reduce thermal efficiency.

In non-continuous steelmaking, wet material and grease material must be added in batch for drying, and only dry material can be added after forming a molten pool. Small stoves generally hand loading, with boxes or chute will be loaded into the furnace, big stoves can be used conveyor belt or basket loading.


It is necessary to pay close attention to the melting of the charge, constantly add the charge and loosen the charge timely and constantly, so that it drops smoothly to the molten pool, keep the melting in line, and avoid the appearance of bridging. The so-called "bridge" is in the semi-molten state of the furnace charge above the molten pool bond so that the furnace charge can not contact the molten pool. This causes the temperature of the molten pool to rise sharply, damaging the crucible.

Once there is a bridge, tilt the crucible, melting the gap on the raised charge, in order to continue to feed, the steel water surface to the bridge, to remove the bonded charge.


After the charge is fully melted, temperature measurement, sampling, skilled operators can adjust the input power, correctly predict the temperature rise to the steel temperature time, so as to coordinate the operation before the furnace. According to the analysis result of steel sample before furnace, alloy material was added, and at the same time, ferrosilicon powder and various compound deoxidizer were used to deoxidize.

The above is the introduction of induction furnace steelmaking technology, select the appropriate charge, pay attention to the size, fill with small blocks in the middle of the large block, avoid the occurrence of bridging and other situations, affecting the smooth decline of the charge.

Metal can go a long way from the furnace to the highway, but without this process, we wouldn't be living in the convenient and advanced world in which we live.

Our company is a manufacturer of industrial induction furnaces. You can pay attention to us to learn more about melting furnaces.

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