Process of producing high quality carbon steel ingot with aluminium and RE added for high grade forging

Abstract

The present invention is the technological process of adding aluminum and RE to produce high quality carbon steel ingot for high grade forging. During producing high quality carbon steel ingot, final deoxidizing agent of aluminum and RE is adopted and aluminum in 0.5-0.9 Kg and RE in 0.5-0.8 Kg for each ton of steel are added successively while smelting, and the steel ingot is demolded after 7-9 times the setting time. The high quality carbon steel ingot of the present invention may be used in producing high grade forging.

Description

technical field

[0001] The invention relates to iron and steel smelting technology, in particular to a production process for adding aluminum and rare earth to high-quality carbon steel ingots to improve the flaw detection level of forgings. Background technique

[0002] At present, the production method of high-quality carbon steel ingots is to smelt solid raw materials into molten steel in an electric furnace, refine them with refining slag during the reduction period, and finally add trace amounts of aluminum or rare earth, silicon aluminum calcium barium and other strong deoxidizers to deoxidize and then pour them into Cooling in the ingot mould. Although such a process is better than deoxidizing without a strong deoxidizer, the structure of the steel ingot is coarse and the segregation is serious. When the steel ingot is used for forging products, it cannot guarantee that the flaw detection of the steel ingot after forging can reach the national standard level 3 or abov...