公开(公告)号：US11459149B2

公开(公告)日：2022-10-04

申请号：US16631539

申请日：2018-07-25

Applicant: JFE STEEL CORPORATION

Inventor： Takashi Ueno ,  Nobusuke Kariya ,  Katsumi Kojima ,  Yoshihide Yamamoto ,  Akihiro Katagiri

IPC: B65D41/12 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C21D8/02 ,  C23G1/00

Abstract: A steel sheet for crown cap having excellent formability from which a crown cap having an excellent pressure resistance can be produced without an expensive soft liner even if the steel sheet is subjected to sheet metal thinning, the steel sheet having: a chemical composition containing, in mass %, C: more than 0.006% and 0.012% or less, Si: 0.02% or less, Mn: 0.10% or more and 0.60% or less, P: 0.020% or less, S: 0.020% or less, Al: 0.01% or more and 0.07% or less, and N: 0.0080% or more and 0.0200% or less, with the balance being Fe and inevitable impurities; and a percentage of a region of more than 0% and less than 20% at a position of ½ of a sheet thickness, the region having a dislocation density of 1×1014 m−2 or less.

公开(公告)号：US11359255B2

公开(公告)日：2022-06-14

申请号：US16628793

申请日：2018-07-25

Applicant: JFE STEEL CORPORATION

Inventor： Nobusuke Kariya ,  Takashi Ueno ,  Yoshihide Yamamoto ,  Katsumi Kojima ,  Bungo Tateno

IPC: C21D9/46 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C21D8/02 ,  C21D6/00 ,  B65D41/12

Abstract: A steel sheet for crown cap having: a chemical composition containing, C, Si, Mn, P, S, Al, N, with the balance being Fe and inevitable impurities; a ferrite phase in a region from a depth of ¼ of a sheet thickness to a mid-thickness part, the ferrite phase having a standard deviation of ferrite grain size of 7.0 μm or less; a yield strength of 560 MPa or more and 700 MPa or less in a rolling direction; and a difference of 25 MPa or more between a yield strength in a 2% strain tensile test and a yield strength in a tensile test after heat treatment at 170° C. for 20 minutes, in the rolling direction.