Recarburizer for steelmaking with recarburizer (ferrous metallurgy industry standard of the People’s Republic of China, YB/T 192-2001 steelmaking with recarburizer) and cast iron with recarburizer, and some other added materials are also useful to recarburizer, such as brake pad with additives, as friction materials.Recarburizer belongs to external steelmaking, ironmaking recarburizer raw materials.High quality recarburizer is an indispensable auxiliary additive in the production of high quality steel.

Use of carbon agent:

In the smelting process, due to improper batching or charging and excessive decarburization and other reasons, sometimes caused in steel carbon content did not meet the requirements of the peak period, then to the liquid steel carburization.Commonly used carburizing agent carburizing pig iron, electrode powder, petroleum coke powder, charcoal powder and coke powder.Converter smelting medium and high carbon steel, the use of petroleum coke containing few impurities as carburizing agent.The requirements of recarburizer for top blown converter steelmaking are high fixed carbon, low content of ash, volatiles, sulfur, phosphorus, nitrogen and other impurities, dry, clean, and moderate      particle size.

The fixed carbon group is divided into:

w(C)>96%, volatile matter ≤1.0%, W (S)≤0.5%, W (moisture)≤0.55%, particle size of 1 to 5mm.

If the particle size is too fine, it is easy to burn. If it is too coarse, it floats on the surface of molten steel and is not easy to be absorbed by molten steel.For the particle size of the induction furnace in 0.2-6mm, steel and other black metal particle size in 1.4-9.5mm, high carbon steel requires low nitrogen, particle size in 0.5-5mm, and so on specific need according to the specific furnace smelting workpiece type and so on the details of the specific judgment and selection.

1, furnace input method:

Recarburizer is suitable for melting in the induction furnace, but the specific use is not the same according to the process requirements.

(1) the use of recarburizer in medium frequency electric furnace smelting, according to the ratio or carbon equivalent requirements with the material added to the lower part of the electric furnace, the recovery rate can reach more than 95%;

(2) if the lack of carbon adjustment, the first dozen net furnace slag, plus carburant, by raising the temperature of molten iron, or artificial electromagnetic stirring to dissolve carbon absorption, the recovery rate is around 90%, if the low-temperature carbonization process, the melt furnace charge only part of the molten iron liquid under the condition of low temperature, all recarburizer one-time in liquid iron,At the same time, it is pressed into the molten iron with a solid charge so as not to expose the surface of the molten iron.By this method, the carburization of liquid iron can reach more than 1.0%.

2, outside the furnace carburizing:

(1) spray graphite powder in the bag

Using graphite powder as recarburizer, the injection volume is 40kg/t, and the carbon content of liquid iron is expected to increase from 2% to 3%.The temperature of molten iron before carburization was 1600℃, and the average temperature after carburization was 1299℃.Jet graphite powder carburization, generally use nitrogen as a carrier, but under industrial production conditions, with compressed air is more convenient, and the oxygen combustion in compressed air to produce CO, chemical reaction heat can compensate part of the temperature drop, and CO reducing atmosphere to improve the effect of carburization.

(2) the use of recarburizer when iron

100-300 purposes of graphite powder carburizer can be put into the bag, or from the iron tank with the flow into, after the iron liquid fully stirred, as far as possible to dissolve carbon absorption, the recovery rate of carbon is about 50%.

Used for casting, cast iron, cast steel, cast will have a requirement for carbon, carburant just as its name implies is to increase the carbon content in liquid iron, and, for example, commonly used in smelting furnace charge for pig iron, scrap steel, back to the furnace charge, iron carbon content is high, but relatively scrap purchase price is higher section, so increase the scrap supply, reduce the quantity of cast iron,The addition of recarburizer can reduce the casting cost to some extent.