Use of recarburizers

In the smelting process, due to improper batching or charging and excessive decarburization, sometimes the carbon content in the steel does not meet the requirements of the peak period, and carbon should be added to the molten steel at this time.

Commonly used recarburizers include carbonized pig iron, electrode powder, petroleum coke powder, charcoal powder and coke powder. In converter smelting of medium and high carbon steel, petroleum coke with few impurities is used as a recarburizer. The requirements for recarburizers for top-blown converter steelmaking are that the fixed carbon should be high, the ash, volatile, and sulfur, phosphorus, nitrogen and other impurities should be low, dry, clean, and moderate in particle size.

Carburizer

Its fixed carbon components are:

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

If the particle size is too fine, it is easy to burn, and if it is too coarse, it floats on the surface of molten steel and is not easily absorbed by molten steel. For induction furnaces, the particle size is 0.2-6mm, of which steel and other ferrous metals have a particle size of 1.4-9.5mm, high carbon steel requires low nitrogen, and the particle size is 0.5-5mm, etc. The specific needs of smelting workpieces according to specific furnace types The types and other details of the specific judgment and selection.

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