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ULTRA-CLEAN RARE EARTH STEEL AND OCCLUDED FOREIGN SUBSTANCE MODIFICATION CONTROL METHOD 发明申请

2023-11-04 4130 834K 0

专利信息

申请日期 2025-07-01 申请号 EP19944733
公开(公告)号 EP3943631A1 公开(公告)日 2022-01-26
公开国别 EP 申请人省市代码 全国
申请人 Institute Of Metal Research Chinese Academy Of Sciences
简介 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 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, 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.


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