Adjusting the Amount of Carbon in Induction Furnace

Add more iron.

Or less coke?

"When iron is smelted from its ore by commercial processes, it contains more carbon than is desirable. To become steel, it must be melted and reprocessed to reduce the carbon to the correct amount, at which point other elements can be added. "

http://en.wikipedia.org/wiki/Steel

"Steel is an alloy made by combining iron and other elements, the most common of these being carbon. When carbon is used, its content in the steel is between 0.2% and 2.1% by weight, depending on the grade. Other alloying elements sometimes used are manganese, chromium, vanadium and tungsten.^[1]Carbon and other elements act as a hardening agent, preventing dislocations in the iron atom crystal lattice from sliding past one another. Varying the amount of alloying elements and the form of their presence in the steel (solute elements, precipitated phase) controls qualities such as the hardness, ductility, and tensile strength of the resulting steel. Steel with increased carbon content can be made harder and stronger than iron, but such steel is also less ductile than iron."

Thank you for your attention.

We produce a steel which contains carbon between 0.3-0.4. Unfortunately, sometimes the pice of iron is charged in the furnace and amount of carbon increase to 0.5 or 0.6.

So, we must reduce the carbon to the correct amount. But which method??

My question is exactly it! What is the best applicable method to reduce the carbon in induction furnace?

There are some method to reduce carbon but these methodes make porosity and... in bar. So these methodes are rejected.

Please guid me and get me a correct method to produce a intact bar.

Thank you

You burn it out...This is the modern steel-making process called Basic Oxygen steel-making......

"Basic oxygen steelmaking (BOS, BOP, BOF, and OSM), also known as Linz-Donawitz-Verfahren steelmaking or the oxygen converter process^[1] is a method of primary steelmaking in which carbon-rich molten pig iron is made into steel. Blowing oxygen through molten pig iron lowers the carbon content of the alloy and changes it into low-carbon steel. The process is known as basic due to the type of refractories-calcium oxide and magnesium oxide-that line the vessel to withstand the high temperature of molten metal."

http://en.wikipedia.org/wiki/Basic_oxygen_steelmaking

I was involved in steel making using electric arc furnaces and watching the melter (foreman) was quite a learning experience. First we took a sample and had it analysed. If we were high in carbon then we blew it down with an oxygen lance. If we were low then we added carbon from our inventory usually with another lance but could be done with a scoop shovel depending on the lab reading. Electric arc furnaces use carbon electrodes and these will also add to the content of carbon but with experience you can gauge the carbon deposit. Other materials can be added to create a flux to remove impurities but for now I will just address the carbon issue. Adding iron is not an option unless you have a lot of time to play with the mix. Tackle each element one at a time.

Thank you dear roy hammy

You're right. But there isn't any oxygen blower in induction furnace.

Please help me

If you cannot insert an oxygen lance into the furnace through a port in the furnace door or lid then you will have to pour the molten metal into a ladle and blow it down that way. You will not loose heat as the oxygen will increase the heat somewhat. In my final year at the steel mill we adopted ladle refining where we performed the final analysis in the ladle and mixed the steel with a nitrogen lance. I am unfamiliar with the fine details of an induction furnace but our electric arc furnaces had a door about a meter square with a port about 15 cm square for performing the lance work. I was in maintenance but had close ties with production.

Thank you.

It is no doubt that arc furnace is better than induction.

You said to had close ties with production. So, perhaps you could answer my question about oxidation of carbon, manganese and silicium.

I want to know which of them are oxidized faster from 1500^oC to 1650^oC.

Thank you so much.

Sorry but I have no knowledge of these details concerning oxidation temperatures of various elements. This info should be found on the net or one of our colleagues on this site may be able to shed some light.

in induction furnace carbon contents can be reduced using rolling mill scale or bundles of iron