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] Carbon-containing pellets, as the name implies, are pellets containing a certain amount of carbon, such as coke, coal, graphite carbon, charcoal, etc. 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 the carbon content of ordinary metallurgical carbon-containing pellets is relatively low, generally not exceeding 30%, such as the pellets used to produce sponge iron, usually with a carbon content of 10-20%, and its role is that carbon is used as a reducing agent throughout the roasting process; iron-containing sintering used in the blast furnace or shaft furnace production process Pellets are generally mixed with 5% coke powder, and the carbon in them is used...

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.