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：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.