公开(公告)号：US20180030558A1

公开(公告)日：2018-02-01

申请号：US15552755

申请日：2015-12-11

Applicant: JFE STEEL CORPORATION

Inventor： Tomoyuki OKUBO ,  Kohei KURIHARA ,  Yoshihiko ODA ,  Hiroaki NAKAJIMA

IPC: C21D8/12 ,  H01F1/16 ,  C22C38/58 ,  C22C38/60 ,  C21D9/46 ,  C22C38/00

CPC classification number: C21D8/12 ,  C21D1/34 ,  C21D1/42 ,  C21D8/1272 ,  C21D9/46 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/004 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/58 ,  C22C38/60 ,  H01F1/14775 ,  H01F1/16

Abstract: In the production of a non-oriented electrical stress sheet by hot rolling a steel slab containing, by mass %, C: not more than 0.005%, Si: not more than 8.0%, Mn: 0.03-3.0%, P: not more than 0.2%, S: not more than 0.005%, Al: not more than 3.0%, N: not more than 0.005%, Ni: not more than 3%, Cr: not more than 5%, Ti: not more than 0.005%, Nb: not more than 0.003%, As: not more than 0.005% and O: not more than 0.005%, subjecting to one cold rolling or two or more cold rollings interposing an intermediate annealing therebetween after conducting a hot band annealing or without conducting a hot band annealing and subjecting to a finish annealing, an average heating rate from 600° C. to 700° C. during the heating process in the finish annealing is set to not less than 50° C./sec.

公开(公告)号：US20210040579A1

公开(公告)日：2021-02-11

申请号：US16976898

申请日：2019-02-06

Applicant: JFE STEEL CORPORATION

Inventor： Ken SAKAI ,  Shinichi KITAMURA ,  Kohei KURIHARA ,  Yusuke OTA

IPC: C21D9/56 ,  C21D1/26

Abstract: A method of annealing a steel sheet in an annealing furnace, including: supporting and conveying a steel sheet with hearth rolls; and supporting and conveying the steel sheet with a full-ceramic hearth roll as a hearth roll located in an area where a furnace temperature is equal to or higher than 950° C., wherein a main constituent of the full-ceramic hearth roll is silicon nitride with use of an Al—Y-based sintering aid.