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公开(公告)号：US20220307097A1
公开(公告)日：2022-09-29
申请号：US17641732
申请日：2019-09-29
Inventor： Dianzhong LI , Yikun LUAN , Pei WANG , Xiaoqiang HU , Paixian FU , Hongwei LIU , Lijun XIA , Chaoyun YANG , Hanghang LIU , Hang LIU , Yiyi LI
Abstract: Provided in the present application are a rare-earth microalloyed steel and a control process. The steel has a special microstructure, and the microstructure comprises a rare earth-rich nanocluster having a diameter of 1-50 nm. The nanocluster has the same crystal structure type as a matrix. The rare earth-rich nanocluster inhibits the segregation of the elements S, P and As on a grain boundary, and obviously improves the fatigue life of the steel. In addition, a rare-earth solid solution also directly affects a phase change dynamics process so that the diffusion-type phase change starting temperature in the steel changes at least to 2° C., and even changes to 40-60° C. in some kinds of steel, thereby greatly improving the mechanical properties thereof, and providing a foundation for the development of more kinds of high-performance steel.
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2.发明申请公开(公告)号：US20140096648A1
公开(公告)日：2014-04-10
申请号：US14105167
申请日：2013-12-12
Inventor： Dianzhong LI , Paixian FU , Hongwei LIU , Lijun XIA , Yiyi LI
CPC classification number: C21C7/064 , C21C7/0075 , C21C7/06 , C21C7/0645 , C21C7/076 , C21C7/10 , C22C38/22 , C22C38/40 , Y02P10/242
Abstract: 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.
Abstract translation: 控制钢锭A型偏析的方法。 该方法包括：1）控制钢液中的磷含量小于或等于0.005wt。 从电炉出来，防止钢渣进入钢包，控制有害元素的含量小于或等于100ppm; 并向每吨液态钢中加入3至15kg的氧化钙和少于或等于0.5kg的铝; 2）使用真空碳脱氧对液态金属进行预脱氧; 3）脱硫，控制氧含量，控制钢液中硫的含量小于或等于0.005wt。 ％; 和4）进行真空脱气，控制总氧含量小于或等于15ppm; 并在惰性气体存在下或在真空中铸造钢。
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公开(公告)号：US20220259707A1
公开(公告)日：2022-08-18
申请号：US17611061
申请日：2019-09-29
Inventor： Dianzhong LI , Yikun LUAN , Hongwei LIU , Paixian FU , Xiaoqiang HU , Pei WANG , Lijun XIA , Chaoyun YANG , Hanghang LIU , Yang LIU , Peng LIU , Yiyi LI
Abstract: Provided are an ultra-clean rare earth steel and an occluded foreign substance modification control method, the steel includes 10-200 ppm of rare earth elements, 50% or more occluded foreign substances in the steel are dispersed into RE-oxygen-sulfide with the average equivalent diameter Dmean ranging from 1-5 μm in a spherical shape or a substantially spherical shape or a granular shape; according to the method, at least 80%, preferably at least 90%, of Al2O3 occluded foreign substances in the steel are modified into RE-oxygen-sulfide, compared with steel with the same components without rare earth, the total amount of the occluded foreign substances in the steel is reduced by 18% or higher, the cracking probability caused by occluded foreign substances such as Al2O3 in traditional pure steel is reduced, the mechanical performance such as the fatigue life of the steel is remarkably improved.
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4.发明公开公开(公告)号：US20230295780A1
公开(公告)日：2023-09-21
申请号：US18142152
申请日：2023-05-02
Inventor： Dianzhong LI , Yikun LUAN , Hongwei LIU , Paixian FU , Xiaoqiang HU , Pei WANG , Lijun XIA , Chaoyun YANG , Hanghang LIU , Yang LIU , Peng LIU , Yiyi LI
CPC classification number: C22C38/005 , C21C7/0006 , C21C7/04 , C21C7/06 , C22C33/04 , C22C38/004
Abstract: A control process of inclusions in ultra-clean rare earth steel, wherein the content of rare earth elements REM in the ultra-clean rare earth steel, the total oxygen content T[O]m, the total sulfur content T[S]m in the steel, and the total oxygen content T[O]r in a rare earth metal or alloy added to the steel are controlled to satisfy the following formula: −500
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