公开(公告)号：US20250066889A1

公开(公告)日：2025-02-27

申请号：US18724660

申请日：2022-08-31

Applicant: TDK CORPORATION

Inventor： Kensuke ARA ,  Hajime AMANO ,  Kazuhiro YOSHIDOME ,  Takuya TSUKAHARA

IPC: C22C38/10 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/12 ,  C22C38/14 ,  C22C38/30 ,  C22C38/32

Abstract: This soft magnetic alloy contains Fe, Co, and at least one selected from among M and X. M is at least one selected from among Ti, V, Cr, Zr, Nb, Mo, Hf, Ta, and W. X is at least one selected from among Si, B, C and P. A volume ratio of a portion in which both the content of Fe and the total content of M and X fall within specific ranges have a specific relationship with a volume ratio of a portion in which both the content of Co and the total content of M and X fall within specific ranges

公开(公告)号：US20250066886A1

公开(公告)日：2025-02-27

申请号：US18723629

申请日：2022-12-14

Applicant: JFE STEEL CORPORATION

Inventor： Yoshiaki ZAIZEN ,  Yukino MIYAMOTO ,  Yoshihiko ODA ,  Tomoyuki OKUBO ,  Souichiro YOSHIZAKI

IPC: C22C38/02 ,  C22C38/00 ,  C22C38/10 ,  C22C38/60

Abstract: Low iron loss and high magnetic flux density in a Si-gradient magnetic material are achieved. A non-oriented electrical steel sheet is a multilayer electrical steel sheet comprising an inner layer and a surface layer located on each of both sides of the inner layer, wherein the surface layer and the inner layer have specific chemical compositions, ΔSi defined as a difference in Si content between the surface layer and the inner layer is 0.5 mass % to 3.3 mass %, a ratio t1/t of a total thickness t1 of both surface layers to a sheet thickness t is 0.08 to 0.73, a ratio B50/Bs is 0.825 or more, and iron loss W10/10k and the sheet thickness t satisfy W10/10k≤25+6900×t.

公开(公告)号：US20250066870A1

公开(公告)日：2025-02-27

申请号：US18945501

申请日：2024-11-12

Applicant: POSCO CO., LTD

Inventor： Hang-Sik CHO ,  Young-Roc IM

IPC: C21D9/46 ,  C21D8/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/22 ,  C22C38/28 ,  C22C38/32 ,  C23C2/04 ,  C23C2/40

Abstract: Provided is a method of manufacturing a cold-rolled steel sheet. The method includes: cold-rolling a steel material; applying nickel (Ni) powder on a surface of the cold-rolled steel material in a coating amount of 300 mg/m2; heating the steel material to completely transform the steel material to austenite; slowly cooling the heated steel material at a cooling rate of 5-12° C./s to a slow cooling termination temperature of 630-670° C., and maintaining the steel material at the slow cooling termination temperature for 10-90 seconds; rapidly cooling the slowly cooled and maintained steel material at a cooling rate of 7-30° C./s to a temperature range of a martensitic transformation termination temperature or higher and a martensitic transformation initiation temperature or lower; and maintaining the rapidly cooled steel material at a temperature higher than the martensitic transformation initiation temperature and the bainite transformation initiation temperature or lower for 300-600 seconds and partitioning the steel material.

公开(公告)号：US12234535B2

公开(公告)日：2025-02-25

申请号：US17435875

申请日：2020-02-20

Applicant: OSAKA UNIVERSITY

Inventor： Hidetoshi Fujii ,  Kohsaku Ushioda ,  Tomoya Nagira ,  Yoshiaki Morisada

IPC: C22C38/00 ,  B23K20/00 ,  B23K20/12 ,  C22C38/02 ,  C22C38/04 ,  C22C38/20 ,  B23K103/04

Abstract: The present invention provides a weathering steel for solid-state welding that forms an excellent weld when subjected to solid-state welding and has tensile properties equivalent or superior to those of high tensile strength steel, said steel having weathering properties superior to those of conventional weathering steel for welding, wherein the reliability of the weld is equivalent or superior to that of the parent material; and a weathering steel material for solid-state welding. Further, there is provided a solid-state welded structure that includes the weathering steel for solid-state welding according to the present invention, and a solid-state welding method for said weathering steel for solid-state welding. The weathering steel for solid-state welding having a steel composition comprises, in % by mass, C: 0.10 to 0.60% and P: more than 0.035 to 1.000%, with the remainder consisting of Fe and unavoidable impurities.

公开(公告)号：US20250059616A1

公开(公告)日：2025-02-20

申请号：US18721100

申请日：2022-12-20

Applicant: POSCO CO., LTD

Inventor： Hyunwoo Mun ,  Se Il Lee ,  Su-Yong Shin ,  Yunsu Kim

IPC: C21D9/46 ,  C21D1/74 ,  C21D6/00 ,  C21D8/12 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/14 ,  H01F1/147 ,  H01F41/00

Abstract: A double oriented electrical steel sheet according to an exemplary embodiment of the present disclosure contains, in wt %, at least 2.0% of Si, more than 0% and 0.02% or less of AI, 0.02-0.50% of Mn, more than 0% and 0.004% or less of C, and 0.0005-0.005% of S, with the remainder comprising Fe and inevitable impurities, wherein the area percentage of grains having a grain size of 2000 μm or less is 25% or less.

公开(公告)号：US20250059615A1

公开(公告)日：2025-02-20

申请号：US18681514

申请日：2022-06-01

Applicant: JFE STEEL CORPORATION

Inventor： Shuji NISHIDA ,  Ayako TA ,  Hirokazu TANAKA ,  Yasutada SUNAMORI

IPC: C21D9/46 ,  C21D6/00 ,  C21D8/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/20 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/50 ,  C22C38/52 ,  C22C38/54 ,  C22C38/60 ,  C25F1/06

Abstract: Provided is a ferritic stainless steel sheet having both high whiteness and high image clarity. A surface of the ferritic stainless steel sheet is made up of plateau portions and valley portions, an area ratio of the plateau portions is 30% to 70%, Sdr of the plateau portions is 0.100 or less, Sdq of the valley portions is 0.20 or more, Sal is 50 μm or less, and Str is 0.30 or more.

公开(公告)号：US12227817B2

公开(公告)日：2025-02-18

申请号：US18036253

申请日：2022-01-19

Applicant: NIPPON STEEL CORPORATION

Inventor： Shinichiro Tabata ,  Kazuhisa Kusumi ,  Yuki Suzuki

IPC: B32B15/01 ,  C21D1/18 ,  C21D6/00 ,  C21D8/02 ,  C21D9/46 ,  C22C33/04 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/20 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/34 ,  C22C38/38 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54 ,  C22C38/60 ,  C23C2/06 ,  C23C2/12 ,  C23C2/40

Abstract: This steel has a steel sheet substrate and a protective film formed on at least a part of a surface of the steel sheet substrate, the chemical composition of the steel sheet substrate is, by mass %, C: 0.25% to 0.65%, Si: 0.05% to 2.00%, Mn: 0.30% to 3.00%, P: 0.050% or less, S: 0.0100% or less, N: 0.010% or less, O: 0.010% or less, Cr: 0.05% to 1.00%, and Cu: 0.10% to 1.00%, in an X-ray analysis in which measurement is carried out using a CuKα radiation, in a case where a peak intensity at a diffraction angle (2θ) position of 36.6±0.5° is regarded as 100%, the protective film has a peak having a peak intensity of more than 250% at a diffraction angle (2θ) position of 35.5±0.5° and a tensile strength is more than 1,500 MPa.

公开(公告)号：US12227815B2

公开(公告)日：2025-02-18

申请号：US17623919

申请日：2020-06-12

Applicant: JFE Steel Corporation

Inventor： Masao Yuga ,  Hiroyuki Takai ,  Yasumasa Takemura ,  Mitsuhiro Okatsu

IPC: C21D9/08 ,  C21D1/28 ,  C21D6/00 ,  C21D8/10 ,  C22C38/00 ,  C22C38/02 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/58

Abstract: A seamless steel pipe of the present invention is a seamless steel pipe having a composition that includes, in mass %, C: 0.02 to 0.12%, Si: 0.010 to 1.00%, Mn: 0.10 to 2.00%, P: 0.050% or less, S: 0.004% or less, Al: 0.010 to 0.100%, Cu: 0.03 to 0.80%, Ni: 0.02 to 0.50%, Cr: 0.55 to 1.00%, Sb: 0.005 to 0.20%, and the balance Fe and incidental impurities, and satisfying the following formula (1), 1.7×Cu*+11×Cr*+3.8×Sb*≥13.5  (1), where Cu*, Cr*, and Sb* represent average concentrations of Cu, Cr, and Sb, respectively, in mass %, as measured in a region 0.5 to 2.0 mm away from an outer surface of the steel pipe, the seamless steel pipe having a yield strength of 230 MPa or more, and a tensile strength of 380 MPa or more.

公开(公告)号：US20250051893A1

公开(公告)日：2025-02-13

申请号：US18718328

申请日：2022-12-12

Applicant: Hyundai Steel Company

Inventor： Nu Ri Shin ,  Yong Ki Seo ,  Ji Hee Son ,  Sang Bae Jung

IPC: C22C38/32 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/28

Abstract: A material for hot stamping according to an embodiment of the present disclosure includes: a steel sheet including carbon (C) in an amount of 0.28 to 0.50 wt %, silicon (Si) in an amount of 0.15 to 0.70 wt %, manganese (Mn) in an amount of 0.5 to 2.0 wt %, phosphorus (P) in an amount of 0.05 wt % or less, sulfur(S) in an amount of 0.01 wt % or less, chromium (Cr) in an amount of 0.1 to 0.5 wt %, boron (B) in an amount of 0.001 to 0.005 wt %, an additive in an amount of 0.1 wt % or less, a remainder of iron (Fe), and other inevitable impurities; fine precipitates distributed inside the steel sheet, wherein the additive includes at least one of titanium (Ti), niobium (Nb), and vanadium (V), the fine precipitates include nitride or carbide of at least one of titanium (Ti), niobium (Nb), and vanadium (V), and traps hydrogen, and a mean diameter variation coefficient, which is a value obtained by dividing a standard deviation of a mean diameter of the fine precipitates by the mean diameter of the fine precipitates, is 0.7 or less.

公开(公告)号：US20250051892A1

公开(公告)日：2025-02-13

申请号：US18721451

申请日：2022-12-19

Applicant: POSCO Co., Ltd

Inventor： Hong-Seok YANG ,  Nam-II JO ,  Jin-Joo CHOI ,  Seung-Gohn KIM ,  Seok-Jong SEO

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

Abstract: An aspect of the present invention may provide a hot-rolled steel sheet that is excellent in terms of yield strength, vibration damping ratio, weldability, and weld site-low temperature toughness and thus has physical properties suitable for use in a vacuum train tube maximizing energy efficiency of a vacuum train; and a manufacturing method therefor.