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

A high-quality carbon steel and production process technology, applied in the field of iron and steel smelting, can solve the problems of coarse ingot structure, unfavorable forging of high-quality forgings, etc., and achieve the effect of improving the level of flaw detection

Inactive Publication Date: 2009-01-14
RUI STEEL INDAL OF PANZHIHUA GANGCHENG GROUP
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  • Summary
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AI Technical Summary

Problems solved by technology

[0005] The invention overcomes the disadvantages of simply using a certain deoxidizer for deoxidation, resulting in coarse structure of the smelted steel ingot, which is not conducive to forging high-quality forgings, and improves the flaw detection level of forgings

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] For 12 pieces of 45# high-quality steel ingot 9.42T type, the final deoxidation is adopted. First, 0.5Kg / t of aluminum is added to the steel for smelting for 10 minutes, and then 0.5Kg / t of rare earth is added to the steel for re-smelting, and injected into the ingot mold to reach 7-9 times the solidification time After the steel ingot is forged into a shaft, the flaw detection is carried out on the forging, and the flaw detection grades all meet the second level of the national standard.

Embodiment 2

[0013] 35# high-quality steel ingot 9.0T type 16 adopts final deoxidation, first add aluminum 0.9Kg / t steel for smelting for 15 minutes, then add rare earth 0.8Kg / t steel for re-smelting, inject into the ingot mold, reach 7-9 times of solidification time When the mold is demoulded, after forging into a shaft, the forgings are tested for flaws, and the flaw detection grades all meet the national standard level two.

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/06B22D11/16
Inventor 刘南平陈振中周康官常忠
Owner RUI STEEL INDAL OF PANZHIHUA GANGCHENG GROUP
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