公开(公告)号：US20220193745A1

公开(公告)日：2022-06-23

申请号：US17594527

申请日：2020-03-04

Applicant: JFE STEEL CORPORATION

Inventor： Shunsuke SASAKI ,  Tatsuro KATSUMURA ,  Hiroki OTA

IPC: B21D3/06

Abstract: Provided is a rolling straightening machine which enables outer-diameter-reducing rolling and straightening rolling of a pipe or tube material or a bar material at high speed with high accuracy. The rolling straightening machine includes at least two rollers arranged across a pass line of a pipe or tube material or a bar material, the at least two rollers having a gap therebetween, the gap being defined by an outer-diameter-reducing rolling portion having a diameter reduced from an upstream side toward a downstream side in the rolling straightening machine and a straightening rolling portion continuous from an exit side of the outer-diameter-reducing rolling portion toward a downstream side of the rolling straightening machine, the rollers having shapes which are symmetrical about the pass line in the outer-diameter-reducing rolling portion, and in the straightening rolling portion, asymmetrical to the pass line in the outer-diameter-reducing rolling portion.

公开(公告)号：US20220106659A1

公开(公告)日：2022-04-07

申请号：US17426245

申请日：2019-11-14

Applicant: JFE STEEL CORPORATION

Inventor： Yusuke YOSHIMURA ,  Shunsuke SASAKI ,  Yuichi KAMO

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

Abstract: Provided is duplex stainless steel which has high strength and high toughness and can be subjected to hot working during manufacturing processes, the duplex stainless steel having a predetermined chemical composition and a microstructure containing an austenite phase in a volume fraction of 20% to 70% and a ferrite phase in a volume fraction of 30% to 80%, and mechanical properties such that a yield strength is 862 MPa or more and an absorption energy in a Charpy impact test at −10° C., vE−10, is 40 J or more.

公开(公告)号：US20230182185A1

公开(公告)日：2023-06-15

申请号：US17921283

申请日：2021-03-17

Applicant: JFE STEEL CORPORATION

Inventor： Shunsuke SASAKI ,  Tatsuro KATSUMURA ,  Hideo KIJIMA

IPC: B21B19/04

CPC classification number: B21B19/04

Abstract: A skew rolling apparatus with which shape defects in non-steady-state portions at the front and back ends of a seamless pipe shell can be prevented. The skew rolling apparatus includes a skew pierce rolling mill configured to pierce roll a steel material into a seamless pipe shell, and a skew outside-diameter mill following the skew piercing mill in a pass direction of the seamless pipe shell in the skew rolling apparatus. The skew rolling apparatus satisfies specified formulae.

公开(公告)号：US20230265947A1

公开(公告)日：2023-08-24

申请号：US18020458

申请日：2021-07-21

Applicant: JFE STEEL CORPORATION

Inventor： Shunsuke SASAKI ,  Ryosuke TACHI ,  Hiroyuki YAMASAKI ,  Hiroyuki FUKUDA

IPC: F16L9/02 ,  B21B19/04

CPC classification number: F16L9/02 ,  B21B19/04

Abstract: A seamless steel pipe has a t/Dout of 0.05 to 0.40, where t is a wall thickness (mm) of the seamless steel pipe, and Dout is an outside diameter (mm) of the seamless steel pipe. The seamless steel pipe has a maximum depth dmax (mm)≤0.350 mm for defects in an inner surface of the steel pipe on a cross section perpendicular to a pipe axis. The seamless steel pipe has an average defect depth dave (mm)≤0.200 mm for defects having a depth of 0.050 mm or more in the inner surface of the steel pipe. The seamless steel pipe, per millimeter of an inner circumferential length of the pipe, has at most 30 defects having a depth of 0.050 mm or more in the inner surface of the steel pipe.

公开(公告)号：US20220388048A1

公开(公告)日：2022-12-08

申请号：US17775952

申请日：2020-09-29

Applicant: JFE STEEL CORPORATION

Inventor： Shunsuke SASAKI ,  Tatsuro KATSUMURA ,  Hiroki OTA

IPC: B21B1/16 ,  B21B19/10 ,  B21B27/02

Abstract: A rolling mill includes three or more rolling rolls aligned along a circumferential direction and arranged so each rotary shaft is skewed with respect to a pass line of a material to be rolled, wherein the material to be rolled made of a pipe or bar material passes between the rolling rolls while being rotated to undergo diameter reducing rolling. At least one rolling roll selected from the three or more rolling rolls is smaller in roll diameter than at least one other rolling roll. When at least one rolling roll having a relatively maximum roll diameter defined as a maximum diameter rolling roll and at least one rolling roll smaller in roll diameter than the maximum is defined as a small diameter rolling roll, the small diameter rolling roll has a roll diameter equal to or less than 90% of the roll diameter of the maximum diameter rolling roll.

公开(公告)号：US20160236249A1

公开(公告)日：2016-08-18

申请号：US15031247

申请日：2014-09-25

Applicant: JFE STEEL CORPORATION

Inventor： Shunsuke SASAKI ,  Tatsuro KATSUMURA ,  Yasushi KATO

IPC: B21B19/04

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.

Abstract translation: 一种用于制造具有优异的低温韧性的重型钢制品的设备生产线，该设备线依次包括加热装置，冷却装置和热加工装置。 工作装置包括多个热加工装置，冷却装置设置在多个热加工装置中的至少一个的入口侧。 此外，在热加工装置的出口侧配置有恒温装置。 设备线为钢产品提供了一种更细微的微结构，相对较少的工作量。