Composite carbon containing pellet

Abstract

The invention belongs to ferrous metallurgy field. It mainly relates to steel smelting carbon containing ball, especially electric furnace using scrap steel making or cast steel carburetion. The compound carbon containing ball chemical compositions (wt%)are containing material 40-80%, metal oxide 10-42%, rare earth oxide 5-30%, bonding agent 2-10%, reinforcing agent 1-5%, expansion agent 1-5%, and steel products processing smear metal 1-4%. Its intensity is high; mono ball compressive strength can reach more than 5Mpa. It can be add into the molten steel to increase carbon, reduce inclusion, removing harmful gas, purify grain boundary, and refine grain to improve steel toughness.

Description

Technical field [0001] The invention belongs to the field of iron and steel metallurgy, and mainly relates to carbon-containing pellets for iron and steel smelting. Background technique [0002] As the name implies, the carbon-containing pellets contain a certain amount of carbon, such as coke, coal, graphite carbon, and charcoal. In the field of iron and steel metallurgy, in different processes, due to the requirements of a certain metallurgical process, different carbon-containing pellets are used, but ordinary carbon-containing pellets for metallurgy have low carbon content and generally do not exceed 30%, such as pellets used in the production of sponge iron, usually contain 10-20% carbon, and its function is to use carbon as a reducing agent during the entire roasting process; iron-containing sintering used in the production process of blast furnace or shaft furnace The pellets are generally mixed with 5% coke powder, and the carbon in it is used as a heating agent and binde...

AI Technical Summary

Problems solved by technology

However, the main disadvantage of the carbon-containing pellets is that the carburization effect is poor, and it cannot meet the carburization requirements of scrap steelmaking for electric furnaces.