Method for controlling A-shaped segregation by purification of liquid steel

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United States of America Patent

PATENT NO 9234252
APP PUB NO 20140096648A1
SERIAL NO

14105167

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Abstract

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A method for controlling A-shaped segregation of steel ingot. The method includes: 1) controlling a content of phosphorus in liquid steel at less than or equal to 0.005 wt. % upon tapping from an electric furnace, preventing steel slag from entering a ladle, controlling content of harmful elements at less than or equal to 100 ppm; and adding between 3 and 15 kg of calcium oxide and less than or equal to 0.5 kg of aluminum to each ton of the liquid steel; 2) pre-deoxidizing the liquid metal using vacuum carbon deoxidation; 3) de-sulfurizing, controlling content of oxygen, and controlling the content of sulfur in the liquid steel at less than or equal to 0.005 wt. %; and 4) performing vacuum degasification, controlling the total oxygen content at less than or equal to 15 ppm; and casting the steel in the presence of inert gas or in vacuum.

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Patent Owner(s)

Patent OwnerAddress
INSTITUTE OF METAL RESEARCH CHINESE ACADEMY OF SCIENCES110016 NO 72 WENHUA ROAD SHENHE DISTRICT LIAONING SHENYANG SHENYANG CITY LIAONING PROVINCE 110016

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Fu, Paixian Shenyang, CN 5 1
Li, Dianzhong Shenyang, CN 8 3
Li, Yiyi Shenyang, CN 7 3
Liu, Hongwei Shenyang, CN 123 844
Xia, Lijun Shenyang, CN 20 88

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