公开(公告)号：US20240301525A1

公开(公告)日：2024-09-12

申请号：US18662318

申请日：2024-05-13

申请人： JFE Steel Corporation

发明人： Takaaki TANAKA ,  Tomoyuki OKUBO

IPC分类号： C21D9/46 ,  C21D6/00 ,  C21D8/12 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/10 ,  C22C38/12 ,  C22C38/34 ,  C22C38/60 ,  H01F1/147

CPC分类号： C21D9/46 ,  C21D6/002 ,  C21D6/005 ,  C21D6/007 ,  C21D6/008 ,  C21D8/1222 ,  C21D8/1233 ,  C21D8/1261 ,  C21D8/1277 ,  C22C38/001 ,  C22C38/002 ,  C22C38/004 ,  C22C38/005 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/10 ,  C22C38/12 ,  C22C38/34 ,  C22C38/60 ,  H01F1/14791 ,  C22C2202/02

摘要： A non-oriented electrical steel sheet includes, by mass %, C: 0.010% or less, Si: 1.0% or more and 5.0% or less, Mn: 0.05% or more and 5.0% or less, P: 0.1% or less, S: 0.01% or less, Al: 3.0% or less, N: 0.005% or less, and the balance being Fe and inevitable impurities, wherein an average crystal grain size is 50 μm or less, and a sum SA of area ratios of crystal grains with oriented in a rolling direction or a direction perpendicular to the rolling direction and a sum SB of area ratios of crystal grains with oriented in the rolling direction or the direction perpendicular to the rolling direction satisfy SA−SB≥0.

公开(公告)号：US20240295014A1

公开(公告)日：2024-09-05

申请号：US18275704

申请日：2021-02-19

申请人： NIPPON STEEL CORPORATION

发明人： Yoshihiro ARITA ,  Masahiro FUJIKURA

IPC分类号： C22C38/02 ,  C21D6/00 ,  C21D8/12 ,  C21D9/46 ,  C22C38/00 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/14

CPC分类号： C22C38/02 ,  C21D6/008 ,  C21D8/1222 ,  C21D8/1233 ,  C21D8/1272 ,  C21D9/46 ,  C22C38/004 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/14 ,  C21D2211/004 ,  C21D2211/005

摘要： A hot rolled steel sheet for a non oriented electrical steel sheet according to the present invention includes a predetermined amount of Si, Mn, Al, Ti, Nb, V, and Zr as a chemical composition, wherein when viewing a cross section which is parallel to a rolling direction and a thickness direction, an AlN with an equivalent circle diameter of 10 to 200 nm exists in a grain and at a grain boundary of a ferrite grain, a number density of AlN which exists in the grain and at the grain boundary is 8.0 pieces/μm2 or less on the basis of an observed area, and a number density of AlN which exists at the grain boundary is 40 pieces/μm2 or less on the basis of a grain boundary area.

公开(公告)号：US20240254586A1

公开(公告)日：2024-08-01

申请号：US18625591

申请日：2024-04-03

申请人： ArcelorMittal

发明人： Sebastian COBO ,  Christian ALLELY ,  Martin BEAUVAIS ,  Anis AOUAFI ,  Emmanuel LUCAS

IPC分类号： C21D9/48 ,  B32B15/01 ,  C21D1/673 ,  C21D6/00 ,  C21D8/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/44 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54 ,  C23C2/02 ,  C23C2/06 ,  C23C2/12 ,  C23C2/28 ,  C23C2/40

CPC分类号： C21D9/48 ,  B32B15/012 ,  B32B15/013 ,  C21D1/673 ,  C21D6/004 ,  C21D6/005 ,  C21D6/008 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0263 ,  C22C38/001 ,  C22C38/004 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/44 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54 ,  C23C2/02 ,  C23C2/022 ,  C23C2/024 ,  C23C2/06 ,  C23C2/12 ,  C23C2/28 ,  C23C2/40 ,  C21D2211/002 ,  C21D2211/008

摘要： A method for manufacture of a hot-rolled steel sheet which includes: producing a liquid steel to which manganese, silicon, niobium, and chromium are added, the additions being made in a vacuum chamber, then desulfurizing the liquid metal without increasing its nitrogen content, then adding titanium, said additions being made so as to obtain a liquid metal having a chemical composition where the titanium and nitrogen contents satisfy: Ti/N>3.42, and the carbon, manganese, chromium, and silicon contents satisfy: 2.6C+Mn/5.3+Cr/13+Si/15>=1.1%, then casting a semi-finished product, then heating said semi-finished product to a temperature between 1250° C. and 1300° C. for a holding period at this temperature between 20 minutes and 45 minutes, then hot rolling said semi-finished product to a rolling end temperature TFL between 825° C. and 950° C., to obtain a hot-rolled sheet, then coiling said hot-rolled sheet at a temperature between 500° C. and 750° C. to obtain a hot-rolled and coiled sheet, then pickling the oxide layer formed in the previous steps.

公开(公告)号：US20240229203A9

公开(公告)日：2024-07-11

申请号：US18277747

申请日：2022-02-08

申请人： NIPPON STEEL Stainless Steel Corporation

发明人： Toshiki YOSHIZAWA ,  Jun-ichi HAMADA

IPC分类号： C22C38/58 ,  C21D1/18 ,  C21D8/02 ,  C21D9/46 ,  C22C38/00 ,  C22C38/02 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48

CPC分类号： C22C38/58 ,  C21D1/18 ,  C21D8/0205 ,  C21D8/0226 ,  C21D9/46 ,  C22C38/001 ,  C22C38/004 ,  C22C38/02 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48

摘要： A martensitic stainless steel sheet for a brake disc rotor, characterized by containing predetermined components and having, in a mother phase, precipitates with a particle size of 2 μm or less and a density of 0.01 to 20 pieces/μm2. The precipitates finely present in hot rolling and hot-rolled sheet annealing improves productivity in hardening, improves temper softening resistance of the steel sheet in use as a component, inhibits cracking in hot stamping, and inhibits reduction in high-temperature strength. Accordingly, the martensitic stainless steel sheet excellent in temper softening resistance, hardenability, formability, and high-temperature strength that is applicable to the disc rotor is provided.

公开(公告)号：US12024762B2

公开(公告)日：2024-07-02

申请号：US18279161

申请日：2022-03-31

申请人： NIPPON STEEL CORPORATION

发明人： Minako Fukuchi ,  Yoshiaki Natori ,  Tesshu Murakawa

IPC分类号： C22C38/02 ,  C21D9/46 ,  C22C38/00 ,  C22C38/06 ,  H01F1/147

CPC分类号： C22C38/02 ,  C21D9/46 ,  C22C38/004 ,  C22C38/06 ,  H01F1/147

摘要： A non-oriented electrical steel sheet has a chemical composition in which α-γ transformation can occur and which contains at least, in terms of mass %, at most 0.010% of C, 1.50% to 4.00% of Si, 0.0001% to 1.0% of sol. Al, at most 0.010% of S, at most 0.010% of N, and a total of 2.50% to 5.00% of at least one selected from the group consisting of Mn, Ni, and Cu, with the balance including Fe and impurities, wherein when an average grain size of {411} crystal grains is defined as d411 and an average grain size of {111} crystal grains is defined as d111, d411/d111≥1.10.

公开(公告)号：US20240158884A1

公开(公告)日：2024-05-16

申请号：US18550459

申请日：2022-02-28

申请人： JFE STEEL CORPORATION

发明人： Yoshiyasu KAWASAKI ,  Yuki TOJI ,  Tatsuya NAKAGAITO ,  Shinya YAMAGUCHI ,  Masayasu UENO ,  Katsutoshi TAKASHIMA ,  Tomohiro ONO

IPC分类号： C21D9/46 ,  B32B15/01 ,  C21D6/00 ,  C21D8/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/10 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/24 ,  C22C38/38 ,  C22C38/60 ,  C23C2/06 ,  C23C2/28 ,  C25D3/22 ,  C25D5/50

CPC分类号： C21D9/46 ,  B32B15/011 ,  C21D6/001 ,  C21D6/002 ,  C21D6/005 ,  C21D6/007 ,  C21D6/008 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0257 ,  C21D8/0263 ,  C21D8/0278 ,  C22C38/001 ,  C22C38/002 ,  C22C38/004 ,  C22C38/005 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/10 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/24 ,  C22C38/38 ,  C22C38/60 ,  C23C2/06 ,  C23C2/285 ,  C25D3/22 ,  C25D5/50

摘要： A clad steel plate having tensile strength (TS) of 780 MPa or more, excellent ductility, bendability, collision resistance, and LME resistance. The clad steel plate having a base metal and a cladding metal on front and back surfaces of the base metal, and the chemical composition and microstructure of the base metal and the cladding metal being appropriately controlled so that the average Vickers hardness (HVL) of the cladding metal is 260 or less, the average Vickers hardness (HVL) of the cladding metal divided by the average Vickers hardness (HVB) of the base metal is 0.80 or less, the boundary roughness between the base metal and the cladding metal is 50 μm or less at the maximum height Ry, and the number of voids at the boundary between the base metal and the cladding metal is controlled to 20 or fewer per 10 mm length of the boundary.

公开(公告)号：US20240084415A1

公开(公告)日：2024-03-14

申请号：US18284765

申请日：2022-03-31

申请人： NIPPON STEEL CORPORATION

发明人： Hiroyoshi YASHIKI ,  Yoshiaki NATORI ,  Kazutoshi TAKEDA ,  Ichiro TANAKA ,  Yoshihiro ARITA ,  Hiroki HORI ,  Wataru OHASHI

IPC分类号： C21D9/46 ,  C21D6/00 ,  C21D8/12 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/60 ,  H01F1/147

CPC分类号： C21D9/46 ,  C21D6/001 ,  C21D6/005 ,  C21D6/008 ,  C21D8/1222 ,  C21D8/1233 ,  C21D8/1261 ,  C21D8/1266 ,  C21D8/1283 ,  C22C38/001 ,  C22C38/002 ,  C22C38/004 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/60 ,  H01F1/14775

摘要： This non-oriented electrical steel sheet includes a base material having a chemical composition including Si: 3.7 to 4.8%, wherein a recrystallization rate is less than 100% in terms of an area fraction, the following Formula (i) and Formula (ii) are satisfied, and the tensile strength is more than 700 MPa.


4.3≤Si+sol. Al+0.5×Mn≤4.9  (i)



(B50(0°)+2×B50(45°)+B50(90°))/4≥1.57  (ii)

公开(公告)号：US20240052463A1

公开(公告)日：2024-02-15

申请号：US18267660

申请日：2021-12-15

申请人： POSCO

发明人： Minserk Kwon ,  Woncheol Chung ,  Hokyung Shim ,  Changsoo Park ,  Seonghoon Min

IPC分类号： C22C38/02 ,  C22C38/00 ,  C22C38/60 ,  C22C38/06 ,  C22C38/04 ,  C21D8/12 ,  C21D6/00

CPC分类号： C22C38/02 ,  C22C38/008 ,  C22C38/60 ,  C22C38/06 ,  C22C38/001 ,  C22C38/004 ,  C22C38/04 ,  C21D8/125 ,  C21D6/008 ,  C21D2201/05

摘要： A grain oriented electrical steel sheet according to an embodiment of the present invention comprises: an electrical steel sheet base comprising 2.0 to 7.0 weight % of Si and 0.01 to 0.07 weight % of Sb, and the remainder being Fe and other unavoidable impurities; a fine-grained interfacial layer positioned in a direction toward the inside of the electrical steel sheet base from the surface of the electrical steel sheet base; a base coating layer positioned on the fine-grained interfacial layer; and an insulating coating layer positioned on the base coating layer.
The grain oriented electrical steel sheet according to an embodiment of the present invention satisfies Formula 1 below.


([P]×[PS]+[F]×[FS]+[C]×[CS])/−([S]/2)≥13.0 MPa   [Formula 1]

(wherein [P] is thickness (μm) of the insulating coating layer, [PS] is residual stress (MPa) of the insulating coating layer, [F] is thickness (μm) of the base coating layer, [FS] is residual stress (MPa) of the base coating layer, [C] is thickness(μm) of the fine-grained interfacial layer, [CS] is residual stress (MPa) of the fine-grained interfacial layer, and [S] is thickness (μm) of the electrical steel sheet base)

公开(公告)号：US20240035128A1

公开(公告)日：2024-02-01

申请号：US18268584

申请日：2021-12-17

申请人： POSCO Co., Ltd

发明人： Minserk KWON ,  Seonghoon MIN ,  Heonjo CHOI

IPC分类号： C22C38/02 ,  C22C38/00 ,  C22C38/60 ,  C22C38/06 ,  C22C38/04 ,  C21D8/12

CPC分类号： C22C38/02 ,  C22C38/008 ,  C22C38/60 ,  C22C38/06 ,  C22C38/04 ,  C22C38/004 ,  C21D8/1283 ,  C21D2201/05

摘要： A method for manufacturing a grain-oriented electrical steel sheet, according to one embodiment of the present invention, comprises the steps of: manufacturing a hot rolled sheet by hot rolling a slab comprising, by wt %, 2.5-4.0% of Si, 0.03-0.09% of C, 0.015-0.040% of Al, 0.04-0.15% of Mn, 0.01% or less of S (excluding 0%) and 0.002-0.012% of N, and the balance of Fe and other inevitable impurities; cold rolling the hot rolled sheet to manufacture a cold rolled sheet; performing primary recrystallization annealing on the cold rolled sheet; and performing secondary recrystallization annealing on the cold rolled sheet for which the primary recrystallization annealing has been completed.

公开(公告)号：US20240026484A1

公开(公告)日：2024-01-25

申请号：US18265413

申请日：2021-12-09

申请人： POSCO CO., LTD

发明人： Yu-Mi HA ,  Jun-Sung YEOM ,  Sang-Ho HAN ,  Seong-Ho HAN ,  Yong-Hoon CHOI

IPC分类号： C21D9/46 ,  C22C38/16 ,  C22C38/14 ,  C22C38/12 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C21D8/02 ,  C21D6/00 ,  C23C2/28

CPC分类号： C21D9/46 ,  C22C38/16 ,  C22C38/14 ,  C22C38/12 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/004 ,  C22C38/002 ,  C22C38/001 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0263 ,  C21D8/0278 ,  C21D6/005 ,  C21D6/008 ,  C23C2/28 ,  C21D2211/005 ,  C23C2/06

摘要： Provided is a plated steel sheet having excellent surface quality, as well as having excellent formability while also having high strength characteristics; and a method for manufacturing same. The plated steel sheet includes: base iron; and a plating layer provided on at least one surface of the base iron. The base iron includes by weight: 0.002 to 0.01% of carbon (C), 0.1% or less of silicon (Si), 0.4 to 1.0% of manganese (Mn), 0.04 to 0.1% of phosphorus (P), 0.01% or less of sulfur (S), 0.005% or less of nitrogen (N), 0.1% or less of aluminum (S·Al), 0.005 to 0.03% of titanium (Ti), 0.01 to 0.05% of niobium (Nb), 0.06 to 0.1% of copper (Cu), 0.0015% or less of boron (B), a content of molybdenum (Mo). The base iron includes ferrite as a matrix structure.