公开(公告)号：US11821051B2

公开(公告)日：2023-11-21

申请号：US16708997

申请日：2019-12-10

Applicant: JFE STEEL CORPORATION

Inventor： Shunsuke Sasaki ,  Tatsuro Katsumura ,  Hiroki Ushida ,  Yasushi Kato

IPC: B21B17/04 ,  C21D9/08 ,  B21B3/02 ,  B21B17/08 ,  B21B19/04 ,  C22C38/00 ,  C22C38/58 ,  B21B45/02 ,  C21D8/10 ,  B21B45/00 ,  C21D6/00 ,  C22C30/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54

CPC classification number: C21D9/085 ,  B21B3/02 ,  B21B17/08 ,  B21B19/04 ,  B21B45/004 ,  B21B45/02 ,  B21B45/0209 ,  B21B45/0215 ,  C21D6/004 ,  C21D6/005 ,  C21D6/008 ,  C21D8/10 ,  C21D8/105 ,  C21D9/08 ,  C22C30/00 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54 ,  C22C38/58 ,  B21B2045/0227 ,  C21D2211/001 ,  C21D2211/005

Abstract: An apparatus line for manufacturing seamless steel pipes and tubes includes: a heating apparatus for heating a steel raw material; a piercing apparatus for piercing the heated steel raw material thus forming a hollow material; and a rolling apparatus for applying working to the hollow material to form a seamless steel pipe having a predetermined shape. A cooling apparatus is arranged on an exit side of the rolling apparatus. A heated steel raw material is worked by the rolling apparatus after being pierced by the piercing apparatus, and thereafter, using a surface temperature of a hollow piece before being cooled by the cooling apparatus as a cooling start temperature, the hollow piece is cooled to a cooling stop temperature differing by 50° C. or more from the cooling start temperature and being equal to or above 600° C. at an average cooling speed of 1.0° C./s or more in terms of an outer surface temperature.

公开(公告)号：US10562085B2

公开(公告)日：2020-02-18

申请号：US15031247

申请日：2014-09-25

Applicant: JFE STEEL CORPORATION

Inventor： Shunsuke Sasaki ,  Tatsuro Katsumura ,  Yasushi Kato

IPC: B21B45/00 ,  B21B19/04 ,  B21B45/02 ,  B21B23/00 ,  C22C38/58 ,  C22C38/00 ,  B21B1/38 ,  C21D9/46 ,  C21D8/10 ,  C21D8/02

Abstract: An equipment line for manufacturing heavy-walled steel products having excellent low-temperature toughness, the equipment line including a heating device, a cooling device, and a hot working device in this order. The working device includes plurality of hot working devices, and the cooling device is arranged on an entrance side of at least one of the plurality of hot working devices. Furthermore, a thermostat equipment is arranged on an exit side of the hot working device. The equipment line provides a steel product with a finer microstructure with a relatively small amount of working.

公开(公告)号：US20180243809A1

公开(公告)日：2018-08-30

申请号：US15557374

申请日：2016-02-18

Applicant: JFE STEEL CORPORATION

Inventor： Takatoshi Okabe ,  Sota Goto ,  Yuji Hashimoto ,  Yasushi Kato ,  Atsushi Matsumoto ,  Shinsuke Ide ,  Hiroki Ota

IPC: B21C37/08 ,  B23K11/06 ,  B23K11/087

CPC classification number: B21C37/08 ,  B23K11/062 ,  B23K11/0873 ,  B23K11/36 ,  B23K13/00 ,  B23K13/02 ,  B23K13/025 ,  B23K13/046 ,  B23K13/06 ,  B23K2101/06 ,  B23K2101/10 ,  B23K2103/04

Abstract: Provided are an electric resistance welded stainless clad steel manufactured by forming a hot-rolled steel strip of clad steel including low-carbon low-alloy steel and stainless steel into a cylindrical shape, and electric resistance welding the edges of the hot-rolled steel strip, characterized in that the flattening characteristic of an electric resistance weld, as-welded, satisfies the formula h/D

公开(公告)号：US10544476B2

公开(公告)日：2020-01-28

申请号：US15529842

申请日：2015-10-07

Applicant: JFE STEEL CORPORATION

Inventor： Shunsuke Sasaki ,  Tatsuro Katsumura ,  Hiroki Ushida ,  Yasushi Kato

IPC: C21D9/08 ,  B21B3/02 ,  B21B17/08 ,  B21B19/04 ,  B21B45/00 ,  B21B45/02 ,  C21D6/00 ,  C21D8/10 ,  C22C30/00 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54

Abstract: An apparatus line for manufacturing seamless steel pipes and tubes includes: a heating apparatus for heating a steel raw material; a piercing apparatus for piercing the heated steel raw material thus forming a hollow material; and a rolling apparatus for applying working to the hollow material to form a seamless steel pipe having a predetermined shape. A cooling apparatus is arranged on an exit side of the rolling apparatus. A heated steel raw material is worked by the rolling apparatus after being pierced by the piercing apparatus, and thereafter, using a surface temperature of a hollow piece before being cooled by the cooling apparatus as a cooling start temperature, the hollow piece is cooled to a cooling stop temperature differing by 50° C. or more from the cooling start temperature and being equal to or above 600° C. at an average cooling speed of 1.0° C./s or more in terms of an outer surface temperature.

公开(公告)号：US20180023158A1

公开(公告)日：2018-01-25

申请号：US15549514

申请日：2015-02-20

Applicant: JFE Steel Corporation

Inventor： Shunsuke Sasaki ,  Tatsuro Katsumura ,  Yasushi Kato

IPC: C21D9/08 ,  C21D6/00 ,  C22C38/54 ,  C22C38/50 ,  C22C38/48 ,  C22C38/46 ,  C22C38/44 ,  C22C38/42 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  B21B3/02 ,  B21B19/04 ,  C21D8/10

CPC classification number: C21D9/08 ,  B21B3/02 ,  B21B19/04 ,  C21D1/18 ,  C21D1/25 ,  C21D6/004 ,  C21D6/005 ,  C21D6/007 ,  C21D7/12 ,  C21D8/10 ,  C21D8/105 ,  C21D2211/001 ,  C21D2211/005 ,  C21D2211/008 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/005 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54 ,  C22C38/58

Abstract: A high-strength heavy-walled stainless steel seamless tube or pipe exhibiting excellent low-temperature toughness is characterized by having a chemical composition containing Cr: 15.5% to 18.0% and a steel microstructure containing a ferritic phase and a martensitic phase, wherein the maximum value of the areas of the ferrite grains in the steel microstructures in a circumferential direction cross section and an L direction (rolling direction) cross section of the steel tube or pipe is 3,000 μm2 or less and the content of ferrite grains having areas of 800 μm2 or less is 50% or more on an area fraction basis, where, when adjacent ferrite grains are present in the steel microstructure and the crystal misorientation between one ferrite grain and the other ferrite grain is 15° or more, the adjacent grains are assumed to be grains different from each other.

公开(公告)号：US20170335422A1

公开(公告)日：2017-11-23

申请号：US15529842

申请日：2015-10-07

Applicant: JFE STEEL CORPORATION

Inventor： Shunsuke Sasaki ,  Tatsuro Katsumura ,  Hiroki Ushida ,  Yasushi Kato

IPC: C21D9/08 ,  B21B3/02 ,  C22C38/48 ,  C22C38/46 ,  C22C38/44 ,  C22C38/42 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C22C30/00 ,  C22C38/50 ,  B21B17/08 ,  B21B19/04 ,  C21D8/10 ,  C21D6/00 ,  B21B45/02 ,  B21B45/00 ,  C22C38/54

CPC classification number: C21D9/085 ,  B21B3/02 ,  B21B17/08 ,  B21B19/04 ,  B21B45/004 ,  B21B45/02 ,  B21B45/0209 ,  B21B45/0215 ,  B21B2045/0227 ,  C21D6/004 ,  C21D6/005 ,  C21D6/008 ,  C21D8/10 ,  C21D8/105 ,  C21D9/08 ,  C21D2211/001 ,  C21D2211/005 ,  C22C30/00 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54 ,  C22C38/58

Abstract: An apparatus line for manufacturing seamless steel pipes and tubes includes: a heating apparatus for heating a steel raw material; a piercing apparatus for piercing the heated steel raw material thus forming a hollow material; and a rolling apparatus for applying working to the hollow material to form a seamless steel pipe having a predetermined shape. A cooling apparatus is arranged on an exit side of the rolling apparatus. A heated steel raw material is worked by the rolling apparatus after being pierced by the piercing apparatus, and thereafter, using a surface temperature of a hollow piece before being cooled by the cooling apparatus as a cooling start temperature, the hollow piece is cooled to a cooling stop temperature differing by 50° C. or more from the cooling start temperature and being equal to or above 600° C. at an average cooling speed of 1.0° C./s or more in terms of an outer surface temperature.