公开(公告)号：US20250144702A1

公开(公告)日：2025-05-08

申请号：US18730104

申请日：2023-03-23

Applicant: JFE STEEL CORPORATION

Inventor： Norichika ARAMAKI ,  Shuhei IRIE ,  Akitoshi MATSUI ,  Hirokazu SUGIHARA ,  Yusuke NOJIMA

IPC: B22D11/124 ,  B22D11/22

Abstract: A steel continuous casting method effectively reducing center segregation occurring inside a cast piece includes cooling of a cast piece performed with a water volume density per surface area of the cast piece in a first section set within a range of 50 to 2000 L/(m2×min) or lower. The first section is a range along a cast piece withdrawing direction in a continuous casting machine, from a start point at which an average value of a solid phase ratio along a thickness direction at a final solidified part in a cast piece width direction is 0.8 or lower to an end point at which the average value of the solid phase ratio along the thickness direction at the final solidified part in the cast piece width direction is higher than the solid phase ratio at the start point but not higher than 1.0.

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.