公开(公告)号：US20240158885A1

公开(公告)日：2024-05-16

申请号：US18549589

申请日：2022-02-14

Applicant: JFE STEEL CORPORATION

Inventor： Kenichi OSUKA ,  Maiko WATANABE ,  Shinsuke KOMINE ,  Hideyuki TAKAHASHI

IPC: C21D11/00 ,  C21D8/02 ,  C21D9/60 ,  C23C2/00

CPC classification number: C21D11/00 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0263 ,  C21D8/0278 ,  C21D9/60 ,  C23C2/004 ,  C21D2211/001

Abstract: To provide continuous annealing equipment, a continuous annealing method, a method of producing cold-rolled steel sheets and a method of producing coated or plated steel sheets which enable a quick response to fluctuations in material properties and enable minimization of fluctuations in mechanical properties of products. The continuous annealing equipment is continuous annealing equipment for steel sheets including, in this order, a heating zone (6) and a soaking zone (7), the soaking zone (7) including a first soaking zone (7A) and a second soaking zone (7B) provided after the first soaking zone (7A), the continuous annealing equipment including: a first induction heating device (9) provided between first soaking zone (7A) and a second soaking zone (7B); and a measuring device (10) configured to measure austenite fractions of the steel sheets at an exit of the second soaking zone (7B).

公开(公告)号：US20220152694A1

公开(公告)日：2022-05-19

申请号：US17600899

申请日：2020-03-27

Applicant: JFE STEEL CORPORATION

Inventor： Shuhei IRIE ,  Satoshi UEOKA ,  Hirokazu SUGIHARA ,  Hiroyuki FUKUDA ,  Norichika ARAMAKI ,  Akitoshi MATSUI ,  Kenichi OSUKA ,  Sho KOKUFU

IPC: B22D11/124 ,  B22D11/14

Abstract: A method for continuously casting steel capable of reducing center segregation that occurs in a slab. In a section in a continuous casting machine in a slab withdrawal direction, a section from a start point at which the average value of solid phase ratios along a thickness direction at a widthwise center of a slab is within a range of 0.4 or more and 0.8 or less to an end point at which the average value of solid phase ratios along the thickness direction at the widthwise center of the slab is greater than the average value of solid phase ratios at the start point and is 1.0 or less is set as a first section. The slab is cooled by water in the first section at a water flow rate per surface area of the slab within a range of 50 L/(m2×min) or more and 2,000 L/(m2×min) or less.