公开(公告)号：EP3943631A1

公开(公告)日：2022-01-26

申请号：EP19944733.5

申请日：2019-09-29

申请人： Institute Of Metal Research Chinese Academy Of Sciences

发明人： LI, Dianzhong ,  LUAN, Yikun ,  LIU, Hongwei ,  FU, Paixian ,  HU, Xiaoqiang ,  WANG, Pei ,  XIA, Lijun ,  YANG, Chaoyun ,  LIU, Hanghang ,  LIU, Yang ,  LIU, Peng ,  LI, Yiyi

IPC分类号： C22C33/04 ,  C21C7/00

摘要： 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 1-5µm 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 Al 2 O 3 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 Al 2 O 3 in traditional pure steel is reduced, the mechanical performance such as the fatigue life of the steel is remarkably improved, precise control over the modification type, distribution and dimension of the occluded foreign substances in the steel is achieved, the method is suitable for researching and producing of high-performance steel in more varieties.

公开(公告)号：EP2876171B1

公开(公告)日：2017-12-06

申请号：EP12878213.3

申请日：2012-10-15

申请人： Institute of Metal Research Chinese Academy of Sciences

发明人： LI, Dianzhong ,  FU, Paixian ,  LIU, Hongwei ,  Xia, Lijun ,  LI, Yiyi

IPC分类号： C21C7/00 ,  C21C7/06 ,  C21C7/064 ,  C21C7/072 ,  C21C7/10 ,  C22C38/22 ,  C22C38/40 ,  C21C7/076

CPC分类号： C21C7/064 ,  C21C7/0075 ,  C21C7/06 ,  C21C7/0645 ,  C21C7/076 ,  C21C7/10 ,  C22C38/22 ,  C22C38/40 ,  Y02P10/242

摘要： 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.

公开(公告)号：EP4008797A1

公开(公告)日：2022-06-08

申请号：EP19945027.1

申请日：2019-09-29

申请人： Institute of Metal Research, Chinese Academy of Sciences

发明人： LI, Dianzhong ,  LUAN, Yikun ,  WANG, Pei ,  HU, Xiaoqiang ,  FU, Paixian ,  LIU, Hongwei ,  XIA, Lijun ,  YANG, Chaoyun ,  LIU, Hanghang ,  LIU, Hang ,  LI, Yiyi

IPC分类号： C21C7/06 ,  C21C7/00 ,  C21C7/10 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/24 ,  C22C38/22

摘要： 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 startingtemperature 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.

公开(公告)号：EP3076152A1

公开(公告)日：2016-10-05

申请号：EP14866310.7

申请日：2014-11-25

申请人： Institute of Metal Research Chinese Academy of Sciences

发明人： GAI, Xiuying ,  LIU, Jinzhu ,  LIU, Yanmei ,  LIU, Hongwei ,  WANG, Yanyan

IPC分类号： G01N1/32

CPC分类号： G01N1/32 ,  C23F1/28

摘要： A corrosion reagent for detecting steel macrostructure and defects, and a detection method; the corrosion reagent is
divided into three sub-reagents in order of use, a first sub-reagent comprising 5%-10% H 2 SO 4 , 20%-25% HNO 3 , and 65%-75% H 2 O, a second sub-reagent comprising 25%-35% HNO 3 and 65%-75% H 2 O, and a third sub-reagent comprising 3%-5% HNO 3 and 95%-97% H 2 O. The detection method comprises the following steps: pretreatment; corroding with the first sub-reagent for 20-30 minutes; corroding with the second sub-reagent for 10-20 minutes; corroding with the third sub-reagent for 3-5 minutes; and scanning and imaging. The method enables the metallurgical defects and microstructure of a steel ingot to be clearly shown without heat erosion, and has low requirements for surface smoothness and flatness of a sample, and is particularly suitable for macrostructure and defect detection for heavy casting and forging.

摘要翻译： 用于检测钢宏观结构和缺陷的腐蚀试剂和检测方法; 腐蚀试剂按使用顺序分为三个副试剂，第一副试剂包含5％-10％H 2 SO 4，20％-25％HNO 3和65％-75％H 2 O，a 包含25％-35％HNO 3和65％-75％H 2 O的第二副试剂，以及包含3％-5％HNO 3和95％-97％H 2 O的第三副试剂。检测方法包括 以下步骤：预处理; 腐蚀第一次试剂20-30分钟; 腐蚀第二次试剂10-20分钟; 用第三副试剂腐蚀3-5分钟; 并进行扫描和成像。 该方法能够在没有热侵蚀的情况下清楚地显示钢锭的冶金缺陷和微观结构，并且对样品的表面平滑度和平坦度要求低，特别适用于重铸和锻造的宏观结构和缺陷检测。

公开(公告)号：EP2876171A1

公开(公告)日：2015-05-27

申请号：EP12878213.3

申请日：2012-10-15

申请人： Institute of Metal Research Chinese Academy of Sciences

发明人： LI, Dianzhong ,  FU, Paixian ,  LIU, Hongwei ,  Xia, Lijun ,  LI, Yiyi

IPC分类号： C21C7/00 ,  C21C7/06 ,  C21C7/064 ,  C21C7/072 ,  C21C7/10

CPC分类号： C21C7/064 ,  C21C7/0075 ,  C21C7/06 ,  C21C7/0645 ,  C21C7/076 ,  C21C7/10 ,  C22C38/22 ,  C22C38/40 ,  Y02P10/242

摘要： 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.

摘要翻译： 一种用于控制钢锭的A形偏析方法。 该方法包括：1）在从上电炉出钢，在小于或等于进入浇包，控制有害元素含量防止钢渣以小于或等于0.005％（重量）控制钢液中磷的含量 为100ppm; 并加入千克氧化钙的3至15之间，且小于或等于0.5公斤的铝与每吨钢液; 2）预脱氧用真空碳脱氧液体金属; 3）脱硫化，控制氧含量，和在小于或等于0.005％（重量）硫控制在钢液中的内容; 和4）进行真空脱气，在小于或等于15ppm的控制总氧含量; 和铸造钢中的惰性气体的或真空存在下进行。