公开(公告)号：CN1208490C

公开(公告)日：2005-06-29

申请号：CN01816085.9

申请日：2001-09-21

Applicant: 新日本制铁株式会社

Inventor： 杉浦夏子 ,  吉永直树 ,  高桥学 ,  吉田亨

IPC: C22C38/06 ,  C21D8/02 ,  C21D9/46

CPC classification number: C22C38/004 ,  C21D1/185 ,  C21D8/0226 ,  C21D2201/05 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12

Abstract: 铁素体钢板，其中组{100} 至{223} 取向的X射线随机强度、{111} 与{111} 三个晶体取向的X射线随机强度比的平均值为3.5或小于此值，同时在轧制方向以及与此轧制方向成直角的方向上的r值中至少之一为0.7或小于此值。

公开(公告)号：CN1401012A

公开(公告)日：2003-03-05

申请号：CN01805008.5

申请日：2001-02-28

Applicant: 新日本制铁株式会社

Inventor： 藤田展弘 ,  吉永直树 ,  高桥学 ,  朝日均 ,  筱原康浩 ,  长谷川泰士

IPC: C22C38/00 ,  C22C38/04 ,  C22C38/58 ,  C21D8/10

CPC classification number: C21D8/10 ,  C21D2201/05 ,  C22C38/001 ,  C22C38/002 ,  C22C38/004 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/14 ,  Y10S148/909

Abstract: 一种具有良好成形性的钢管，其特征是它包括，以质量百分数计：0.0005－0.30％的C，0.001－2.0％的Si和0.01－3.0％的Mn，以及可供选择地含有特定量的特定元素，余量为Fe和不可避免的杂质，并且相对于在钢板的1/2板厚度位置处的板平面，取向群{110} ;－{111} 的平均X射线随机强度比为≥2.0和/或{110} 的X射线随机强度比为≥3.0。钢管具有高强度并在液压成形法和其它成形法中显示出良好的成形性。

公开(公告)号：US12123065B2

公开(公告)日：2024-10-22

申请号：US16065785

申请日：2016-12-23

Applicant: POSCO

Inventor： Oh Yeoul Kwon ,  Se Min Park ,  Jong-Tae Park ,  Jae Kyoum Kim ,  Seung Gon Lee ,  Won Gul Lee

IPC: B23K26/364 ,  B23K26/40 ,  C21D8/12 ,  C21D10/00 ,  C23G1/02 ,  H01F1/18 ,  B23K103/04 ,  C21D9/46 ,  C22C38/02

CPC classification number: C21D8/1283 ,  B23K26/364 ,  B23K26/40 ,  C21D8/12 ,  C21D10/00 ,  C23G1/02 ,  H01F1/18 ,  B23K2103/04 ,  C21D8/1222 ,  C21D8/1233 ,  C21D8/1255 ,  C21D8/1294 ,  C21D9/46 ,  C21D2201/05 ,  C22C38/02

Abstract: A grain-oriented electrical steel sheet according to an embodiment of the present disclosure includes: a forsterite layer formed on the surface of an electrical steel sheet; a groove which is formed on the forsterite layer in a direction perpendicular to a rolling direction; and a forsterite calcination layer which is formed in the direction of both ends of the electrical steel sheet on the basis of an upper end of the groove and has a width of 1.1 to 1.3 times the width of the groove.

公开(公告)号：US20240282491A1

公开(公告)日：2024-08-22

申请号：US18565274

申请日：2022-05-27

Applicant: JFE Steel Corporation

Inventor： Masanori Takenaka ,  Takeshi Imamura ,  Mari Takahashi ,  Noriki Fujita

IPC: H01F1/147 ,  C21D1/74 ,  C21D6/00 ,  C21D8/12 ,  C21D9/46 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/10 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/20 ,  C22C38/22 ,  C22C38/24 ,  C22C38/32 ,  C22C38/34 ,  C22C38/42 ,  C22C38/44 ,  C22C38/50 ,  C22C38/60

CPC classification number: H01F1/14775 ,  C21D1/74 ,  C21D6/001 ,  C21D6/002 ,  C21D6/004 ,  C21D6/005 ,  C21D6/007 ,  C21D8/1222 ,  C21D8/1233 ,  C21D8/1255 ,  C21D8/1261 ,  C21D8/1266 ,  C21D8/1283 ,  C21D9/46 ,  C22C38/001 ,  C22C38/002 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/10 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/20 ,  C22C38/22 ,  C22C38/24 ,  C22C38/32 ,  C22C38/34 ,  C22C38/42 ,  C22C38/44 ,  C22C38/50 ,  C22C38/60 ,  C21D2201/05 ,  C22C2202/02

Abstract: A method for producing a grain-oriented electrical steel sheet includes: heating a steel slab containing a specific composition; subsequently performing hot rolling; performing hot-band annealing as necessary; performing cold rolling either once or two or more times with intermediate annealing between each rolling to obtain a cold-rolled sheet having a final sheet thickness; performing primary recrystallization annealing which also serves as decarburization annealing; and performing finishing annealing. In the method for producing a grain-oriented electrical steel sheet, the heating temperature for the slab is 1300° C. or higher. In the rough rolling of the hot rolling, one of rolling passes is performed in the temperature range of 1200° C. or higher, and subsequently, a next rolling pass is performed in an opposite direction after a time interval of 5 seconds or longer, with a total rolling reduction of the rough rolling achieved 75% or higher.

公开(公告)号：US12060630B2

公开(公告)日：2024-08-13

申请号：US17422471

申请日：2020-01-16

Applicant: NIPPON STEEL CORPORATION

Inventor： Shinsuke Takatani ,  Yoshihiro Arita ,  Shunsuke Okumura ,  Shohji Nagano

IPC: C21D3/04 ,  C21D8/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/54

CPC classification number: C22C38/54 ,  C21D8/0205 ,  C21D8/0226 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C21D2201/05

Abstract: This grain-oriented electrical steel sheet does not have a forsterite film present between a base steel sheet and a tension-insulation coating, in which the base steel sheet contains a predetermined element in a predetermined amount, and in a case in which a cross section perpendicular to a rolling direction of the base steel sheet is viewed, when a region having a length of 10 μm from a surface of the base steel sheet toward the inside of the base steel sheet in a sheet thickness direction of the base steel sheet and a length of 20 mm in a direction perpendicular to the sheet thickness direction is an observation region, needle-like inclusions having a length of 1 μm or more are not present in the observation region.

公开(公告)号：US20240254584A1

公开(公告)日：2024-08-01

申请号：US18289601

申请日：2022-05-13

Applicant: JFE Steel Corporation

Inventor： Hiroshi Hasegawa ,  Hideyuki Kimura

IPC: C21D8/02 ,  C21D9/46 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06

CPC classification number: C21D8/0226 ,  C21D8/0263 ,  C21D9/46 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C21D2201/05 ,  C21D2211/002 ,  C21D2211/008

Abstract: A high-strength hot-rolled steel sheet according to the present invention has a specific chemical composition and a steel microstructure including, as main phases, 80% to 100% of martensite and bainite in terms of total area fraction. An entire area fraction of the martensite dispersed in the bainite is 2% to 20%. Among the martensite dispersed in the bainite, an area fraction of martensite each having an orientation difference of less than 15° between a crystal orientation of the martensite and a crystal orientation of at least one of bainite adjacent to the martensite is 50% or more relative to the whole martensite dispersed in the bainite.

公开(公告)号：US20240247347A1

公开(公告)日：2024-07-25

申请号：US18564171

申请日：2022-05-26

Applicant: JFE Steel Corporation

Inventor： Masanori Takenaka ,  Takeshi Imamura ,  Takaaki Tanaka ,  Hiroi Yamaguchi

IPC: C22C38/02 ,  C21D3/04 ,  C21D6/00 ,  C21D8/12 ,  C21D9/46 ,  C22C38/00 ,  C22C38/04 ,  C22C38/06 ,  C22C38/60

CPC classification number: C22C38/02 ,  C21D3/04 ,  C21D6/008 ,  C21D8/1205 ,  C21D8/1222 ,  C21D8/1233 ,  C21D8/1255 ,  C21D8/1266 ,  C21D8/1272 ,  C21D8/1283 ,  C21D9/46 ,  C22C38/001 ,  C22C38/04 ,  C22C38/06 ,  C22C38/60 ,  C21D2201/05

Abstract: In the production of a grain-oriented electrical steel sheet by heating a steel slab containing, in mass %, C: 0.02 to 0.10%, Si: 2.5 to 5.5%, Mn: 0.01 to 0.30%, S: 0.0010 to 0.040%, Se: 0 to 0.040%, sol. Al: 0.010 to 0.040%; and N: 0.004 to 0.020% to 1300° C. or higher; subsequently performing hot rolling, hot-band annealing as necessary, cold rolling, and primary recrystallization annealing which also serves as decarburization annealing; applying an annealing separator on the surface of the steel sheet; and performing finishing annealing, edge cracks that may occur in the hot rolling are effectively prevented by keeping a slab lateral face temperature at a time of starting rough rolling during the hot rolling equal to or lower than a temperature Te defined by the following Expression Te=−120000 [% S]2+1400 (1) and carrying out width reduction after at least one pass in the rough rolling.

公开(公告)号：US20240240293A1

公开(公告)日：2024-07-18

申请号：US18561841

申请日：2022-05-27

Applicant: JFE STEEL CORPORATION

Inventor： Takeshi IMAMURA ,  Ayaka YOSHIKAWA ,  Masanori TAKENAKA ,  Hiroi YAMAGUCHI

IPC: C22C38/02 ,  C21D1/26 ,  C21D3/04 ,  C21D6/00 ,  C21D8/00 ,  C21D8/12 ,  C22C38/04 ,  C23G1/08

CPC classification number: C22C38/02 ,  C21D1/26 ,  C21D3/04 ,  C21D6/008 ,  C21D8/005 ,  C21D8/1222 ,  C21D8/1233 ,  C21D8/1255 ,  C21D8/1272 ,  C21D8/1283 ,  C22C38/04 ,  C23G1/08 ,  C21D2201/05

Abstract: To provide a method for producing a grain-oriented electrical steel sheet that can solve the problem of cracking in steel sheets during final cold rolling and that can stably produce a grain-oriented electrical steel sheet with low iron loss. A production method includes predetermined steps, wherein the conditions: T≤−4000×A+440, and T≤360 are satisfied, where A denotes an average C content in mass % in a predetermined region of the steel sheet after subjection to annealing preceding final cold rolling and before subjection to the final cold rolling, and T denotes a time in hours from just after the completion of the annealing preceding the final cold rolling to just before the start of the final cold rolling, and after the final cold rolling and before the decarburization annealing, pickling treatment is performed with a predetermined treatment solution.

公开(公告)号：US12037654B2

公开(公告)日：2024-07-16

申请号：US17279194

申请日：2019-09-26

Applicant: JFE Steel Corporation

Inventor： Yukihiro Shingaki ,  Yusuke Shimoyama

IPC: C21D8/12 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/48

CPC classification number: C21D8/1222 ,  C21D8/1205 ,  C21D8/1233 ,  C22C38/001 ,  C22C38/002 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/48 ,  C21D2201/05

Abstract: In a method of producing a grain-oriented electrical steel sheet comprising subjecting a steel slab containing no inhibitor-forming components to hot rolling, cold rolling, primary recrystallization annealing working also as decarburization and to final annealing causing secondary recrystallization after applying an annealing separator on the surface, the final cold rolling for cold rolling the steel sheet to the final thickness uses a warm rolling with a tandem rolling mill at a total rolling reduction of not less than 80% at 150 to 280° C. and is performed by extending a pass line length of the steel sheet between the stands so that T satisfies T≥1.3×L/V, where an distance between the stands is defined as L(m), a speed of the steel sheet passing between the stands is defined as V (mpm), and a pass time during which the steel sheet passes between the stands is defined as T(min).

公开(公告)号：US20240209483A1

公开(公告)日：2024-06-27

申请号：US18562530

申请日：2022-05-24

Applicant: JFE STEEL CORPORATION

Inventor： Yoshihisa ICHIHARA ,  Takeshi OMURA ,  Kunihiro SENDA

IPC: C22C38/02 ,  C21D8/12 ,  C22C38/04

CPC classification number: C22C38/02 ,  C21D8/1294 ,  C22C38/04 ,  C21D2201/05

Abstract: Disclosed is a grain-oriented electrical steel sheet that exhibits excellent transformer characteristics and that has low iron loss and low magnetostriction properties. The grain-oriented electrical steel sheet has a magnetic flux density B-magnetostriction waveform λ, referred to as a butterfly curve, when excited to 1.5 T or more, such that an amount of steel sheet elongation (Δλ) with a magnetic flux density B ranging from 1.0 T to 1.5 T is 0.010×10−6 or more and 0.240×10−6 or less, and a length of a closure domain in the rolling direction, referred to as a closure domain width, is 20 μm or more and 240 μm or less.