スーパークリーン希土類鋼及び介在物の改質制御方法

Japanese Patent JP7384935

B2

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.

Mr. Lee
▲欒▼ ▲義▼坤
▲劉▼ 宏▲偉▼
fu destination
胡 小▲強▼
Wang Pai
夏 立▲軍▼
▲楊▼ 超▲雲▼
▲劉▼ 航航
▲劉▼ 洋
▲劉▼ 朋
Yi Yi Lee

JP2021571312A

November 21, 2023

September 29, 2019

Click for automatic bibliography generation  

Chinese Academy of Sciences

C22C38/00; C21C7/00; C21C7/10

JP2004277777A

CN106609313A
CN106521293A

YUE, Lijie, et al.,"Study on nonmetallic inclusions in clean Cu-P-RE weathering steels",Mater. Res. Express,2018年06月22日,Vol. 5,066534-1~066534-10

Yasuhiko Murayama
Shinya Mihiro
Tatsuhiko Abe

Previous Patent: Continuous interconnections between dissimilar materials

Next Patent: Self-aligned contacts in three-dimensional memory devices and methods for forming them