公开(公告)号：US20220388057A1

公开(公告)日：2022-12-08

申请号：US17770848

申请日：2020-10-23

Applicant: JFE STEEL CORPORATION

Inventor： Tomoya ODAGAKI ,  Kohei FURUMAI ,  Norichika ARAMAKI ,  Kohei ISHIDA ,  Daiki YANAGIDA

IPC: B22D11/057 ,  B22F7/08 ,  B22F10/28 ,  B22D11/059 ,  B33Y10/00 ,  B33Y70/00 ,  B33Y80/00 ,  C22C19/07

Abstract: A method for manufacturing a continuous casting mold in which cracking and spalling are less likely to occur in a filling laminate. The method includes filling a plurality of concave portions formed on an inner surface of a copper-made mold copper plate or a copper alloy-made mold copper plate used for continuously casting steel at least in a region including a meniscus position of molten steel in a casting process with a metal having a thermal conductivity different from that of the mold copper plate.

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.

公开(公告)号：US20200055113A1

公开(公告)日：2020-02-20

申请号：US16342576

申请日：2017-10-16

Applicant: JFE STEEL CORPORATION

Inventor： Kohei FURUMAI ,  Norichika ARAMAKI ,  Yuji MIKI

IPC: B22D11/059 ,  B22D11/04

Abstract: A continuous casting mold including a water-cooled copper mold having a mold copper plate including an inner wall surface, recessed portions disposed partially or entirely in a region of the inner wall surface of the water-cooled copper mold from at least a position located at a meniscus to a position located 20 mm lower than the meniscus, and material-filled layers disposed in the recessed portions with a metal or nonmetal having a thermal conductivity different from that of the mold copper plate of the water-cooled copper mold. A shape of each of the recessed portions at a surface of the mold copper plate includes a curved surface.

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：US20180001377A1

公开(公告)日：2018-01-04

申请号：US15546401

申请日：2016-01-22

Applicant: JFE STEEL CORPORATION

Inventor： Keigo TOISHI ,  Hiroyuki OHNO ,  Norichika ARAMAKI ,  Yuji MIKI

IPC: B22D11/124 ,  B22D11/20

CPC classification number: B22D11/1246 ,  B21B1/466 ,  B21B2201/14 ,  B22D11/1206 ,  B22D11/1282 ,  B22D11/20 ,  B22D11/207 ,  B22D11/225

Abstract: Provided is a continuous casting method of steel that prevents a solidification completion position from being changed even when a drawing speed V of a cast slab is changed. The method includes drawing a cast slab by setting a drawing speed V0 while spraying cooling water to the cast slab at a cooling water spray amount W0 [kg/ton-cast slab]. Then, changing the drawing speed to the speed V1 while spraying cooling water to the cast slab at a cooling water spray amount W1 [kg/ton-cast slab]. The method further includes spraying cooling water to the cast slab at a cooling water spray amount Wt [kg/ton-cast slab] during a period of time t that is obtained by dividing a target length Lt by the drawing speed V0. The water spray amount Wt satisfying either formula (1): Wt W1 under a condition of V1>V0.