公开(公告)号：US20250059618A1

公开(公告)日：2025-02-20

申请号：US18722256

申请日：2022-12-21

Applicant: POSCO CO., LTD

Inventor： Soobin Kwon

IPC: C21D9/46 ,  C21D1/30 ,  C21D1/74 ,  C21D6/00 ,  C21D8/12 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/38 ,  C22C38/60 ,  H01F1/147 ,  H02K1/02 ,  H02K15/02

Abstract: A non-oriented electrical steel sheet according to an embodiment of the present invention includes: a steel sheet base material containing, by wt %: 2.0 to 6.5% of Si, 0.1 to 1.3% of Al, 0.3 to 2.0% of Mn, 0.005 to 0.06% of Cr, and a balance of Fe and other inevitable impurities; and an insulating coating film positioned on the steel sheet base material, wherein Formula 1 below is satisfied before stress relief annealing, and Formula 2 below is satisfied after the stress relief annealing. 0.1 ≥ [ Mn ⁢ coating ⁢ film ] ⁢ / [ Mn ⁢ 50 ] [ Formula ⁢ 1 ] 10 ≥ [ Mn ⁢ coating ⁢ film ] ⁢ / [ Mn ⁢ 50 ] ≥ 1 [ Formula ⁢ 2 ] (in Formulas 1 and 2, [Mn coating film] refers to an average content of Mn (wt %) in the insulating coating film, and [Mn 50] refers to a content of Mn (wt %) at a depth of 50 μm from an interface between the steel sheet base material and the insulating coating film toward an inside of the steel sheet base material.)

公开(公告)号：US12227851B2

公开(公告)日：2025-02-18

申请号：US16615955

申请日：2017-09-01

Applicant: NIPPON STEEL NISSHIN CO., LTD.

Inventor： Susumu Fujiwara ,  Shinya Uesugi ,  Tomoharu Shigetomi

IPC: C23C2/06 ,  C21D3/06 ,  C21D8/02 ,  C22C18/04 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/14 ,  C22C38/32 ,  C23C2/02 ,  C23C2/26 ,  C23C2/28

Abstract: A high-strength surface-coated steel sheet includes a base steel sheet having a composition by mass of C: 0.01 to 0.20%, Si: 0.01 to 0.50%, Mn: 0.10 to 2.50%, P: 0.005 to 0.050%, B: 0.0005 to 0.010%, Ti: 0.01 to 0.20%, Nb: 0 to 0.10%, Mo: 0 to 0.50%, Cr: 0 to 0.50%, Al: 0.01 to 0.10%, and the balance of Fe and inevitable impurities; and a Zn—Al—Mg-based coating layer disposed on a surface of the base steel sheet, The steel sheet has a diffusible hydrogen concentration in the base steel sheet of 0.30 ppm or less and having a time until occurrence of red rust of 7000 hours or more as measured by a salt spray test. The high-strength hot-dip Zn—Al—Mg-based-plated steel sheet has a significantly lowered in-steel concentration of hydrogen which has entered the steel in a plating line and exhibits excellent corrosion resistance.

公开(公告)号：US20250051889A1

公开(公告)日：2025-02-13

申请号：US18719489

申请日：2022-12-14

Applicant: POSCO CO., LTD

Inventor： Jae-Hoon LEE ,  Seong-Ho HAN ,  Yong-Hoon CHOI

IPC: C22C38/04 ,  C21D6/00 ,  C21D8/02 ,  C21D9/68 ,  C22C38/02 ,  C22C38/06 ,  C22C38/12 ,  C22C38/14

Abstract: The present invention relates to a high-strength steel sheet having excellent formability and a high yield ratio, and a manufacturing method therefor, and more particularly, to a high-strength steel sheet having excellent formability and a high yield ratio, and a manufacturing method therefor, the steel sheet having various uses such as that of vehicle parts.

公开(公告)号：US20250051883A1

公开(公告)日：2025-02-13

申请号：US18808644

申请日：2024-08-19

Applicant: ASSAN ALÜMINYUM SANAYI VE TICARET ANONIM SIRKETI

Inventor： Mustafa Murat DUNDAR ,  Mert GUNYUZ ,  Cemil ISIKSACAN ,  Edip Ayberk MUHARREMOGLU

IPC: C22C21/00 ,  C21D8/02 ,  C21D9/00 ,  C22C1/02

Abstract: Disclosed is a method for producing aluminum alloy materials suitable for use in the food industry including processing of a liquid metal mixture having strontium in addition to aluminum by the twin roll continuous casting technique.

公开(公告)号：US12221705B2

公开(公告)日：2025-02-11

申请号：US18251269

申请日：2021-11-05

Applicant: JFE STEEL CORPORATION

Inventor： Shunsuke Yamamoto ,  Katsutoshi Takashima ,  Mai Aoyama ,  Yusuke Okumura ,  Tomomi Kanazawa ,  Katsuya Hoshino ,  Hiroshi Matsuda ,  Ei Okumura ,  Yoichi Makimizu ,  Masaki Koba

IPC: C23C28/02 ,  C21D1/74 ,  C21D6/00 ,  C21D8/02 ,  C21D9/46 ,  C22C33/04 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/28 ,  C22C38/32 ,  C22C38/38 ,  C23C2/02 ,  C23C2/26 ,  C23C2/28 ,  C25D3/20 ,  C25D5/36 ,  C23C2/06 ,  C23C2/40

Abstract: Provided is an alloyed galvanized steel sheet with excellent resistance to cracking in resistance welding at a welded portion, even if crystal orientations of an Fe-based electroplating layer and a cold-rolled steel sheet are integrated at a high ratio at the interface between the Fe-based electroplating layer and the cold-rolled steel sheet. The alloyed galvanized steel sheet has a Si-containing cold-rolled steel sheet containing Si in an amount of 0.1 mass % to 3.0 mass %; an Fe-based electroplating layer formed on at least one surface of the Si-containing cold-rolled steel sheet with a coating weight per surface exceeding 20.0 g/m2, and an alloyed galvanized layer formed on the Fe-based electroplating layer, where crystal orientations of the Fe-based electroplating layer and the Si-containing cold-rolled steel sheet are integrated at a ratio of more than 50% at the interface between the Fe-based electroplating layer and the Si-containing cold-rolled steel sheet.

公开(公告)号：US12221700B2

公开(公告)日：2025-02-11

申请号：US18266269

申请日：2021-12-15

Applicant: POSCO CO., LTD

Inventor： Suk-Kyu Lee ,  Jong-Gi Oh ,  Myung-Soo Kim

IPC: C23C2/02 ,  C21D8/02 ,  C21D9/46 ,  C22C21/10 ,  C22C38/04 ,  C22C38/06 ,  C23C2/00 ,  C23C2/12 ,  C23C2/40

Abstract: Provided is an aluminum coated steel sheet having excellent anti-corrosion properties and weldability, and a manufacturing method thereof. The aluminum coated steel sheet includes: an austenitic base steel sheet including at least 70 area % of an austenite microstructure; and an aluminum coating layer formed on the base steel sheet, wherein the base steel sheet includes at least 80 area % of ferrite in a surface layer portion, which denotes a region extending from the interface with the coating layer to a depth of 100 μm into the base steel sheet, and the aluminum coating layer may have a composition comprising 2-12 wt % of Si, 5-30 wt % of Zn, and 0.1-5 wt % of Mn, with the balance being Al and inevitable impurities.

公开(公告)号：US12221677B2

公开(公告)日：2025-02-11

申请号：US17933633

申请日：2022-09-20

Applicant: KAISER ALUMINUM FABRICATED PRODUCTS, LLC

Inventor： Zhengdong Long ,  Philippe Gomiero ,  Ravi Rastogi ,  Robert A. Matuska ,  Garry R. McDaniel ,  Jason N. Scheuring

IPC: C22C21/10 ,  C21D8/02 ,  C22F1/053

Abstract: Dispersoids 7xxx aluminum alloy products with enhanced fatigue crack growth deviation and Environmentally Assisted Cracking (EAC) resistance are disclosed. The 7xxx aluminum alloy comprises 1 to 3 wt. % Cu, 1.2 to 3 wt. % Mg, 4 to 8.5 wt. % Zn, up to 0.3 wt. % Mn, up to 0.15 wt. % Zr, up to 0.3 wt. % Cr dispersoid elements, incidental elements, and the balance Al. In one embodiment, the alloy includes Zr+Cr+Mn in the range of 0.2 to 0.8 wt. %. In another embodiment, the alloy includes Zr+Mn in the range of 0.07 to 0.7 wt. %. This alloy can be fabricated to plate, extrusion, or forging products, and is especially suitable for aerospace structural components. The products have enhanced EAC resistance and fatigue crack growth deviation resistance. Meanwhile, the products have an excellent combination of strength, fracture toughness, ductility at different orientations, and Stress Crack Corrosion (SCC), and exfoliation corrosion resistance suitable for aerospace application.

公开(公告)号：US12221669B2

公开(公告)日：2025-02-11

申请号：US18709045

申请日：2022-09-22

Applicant: NIPPON STEEL CORPORATION

Inventor： Kentarou Hirata ,  Masaharu Oka ,  Masahito Sakaki ,  Mamoru Saito

IPC: C21D9/46 ,  C21D8/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/14 ,  C23C2/02 ,  C23C2/06 ,  C23C2/40

Abstract: A hot-rolled steel sheet which has excellent rigidity along with high strength, excellent workability, and excellent LME resistance is provided. A hot-rolled steel sheet of the present embodiment consists of, in mass %, C: 0.040 to 0.120%, Si: 0.01 to 0.60%, Mn: 0.50 to 1.50%, P: 0.025% or less, S: 0.010% or less, Al: 0.010 to 0.070%, N: 0.0070% or less, Ti: 0.055 to 0.200%, and B: 0.0010 to 0.0050%, with the balance being Fe and impurities. In the microstructure of the hot-rolled steel sheet, an area fraction of bainitic ferrite is 85% or more and the dislocation density is 8.0×1013 to 100.0×1013/m2. The average equivalent circular diameter of Ti carbides in the hot-rolled steel sheet is 10 nm or less, and the average equivalent circular diameter of grains of the bainitic ferrite is 15 μm or less.

公开(公告)号：US12221668B2

公开(公告)日：2025-02-11

申请号：US17770116

申请日：2020-10-08

Applicant: JFE Steel Corporation

Inventor： Kazuki Endoh ,  Yoshiyasu Kawasaki ,  Yuki Toji

IPC: C21D9/46 ,  B32B15/01 ,  C21D8/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/16 ,  C22C38/38 ,  C22C38/60 ,  C23C2/06 ,  C23C2/28 ,  C23C2/40

Abstract: Provided is a high strength steel sheet that has a predetermined chemical composition and is manufactured under optimum conditions, the high strength steel sheet having a steel microstructure including, by area, ferrite: 30% or more and 80% or less, martensite: 5% or more and 35% or less, and retained austenite: 8% or more, wherein the quotient of the area fraction of grains of the retained austenite, the grains having an aspect ratio of 2.0 or more and a minor axis length of 1 μm or less, divided by the total area fraction of the retained austenite is 0.3 or more, wherein the quotient of the average Mn content (mass %) in the retained austenite divided by the average Mn content (mass %) in the ferrite is 1.5 or more.

公开(公告)号：US12221664B2

公开(公告)日：2025-02-11

申请号：US17292984

申请日：2019-11-08

Applicant: NIPPON STEEL CORPORATION

Inventor： Takuya Takayama ,  Hiroshi Harada ,  Kenji Yamada ,  Masashi Sakamoto

IPC: C21D9/46 ,  B21B1/46 ,  B22D11/128 ,  C21D6/00 ,  C21D8/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/14

Abstract: Using an apparatus for manufacturing a thin steel sheet including the followings which are arranged in order: a continuous casting machine (1) for a thin slab having a slab thickness of 70 mm to 120 mm at a lower end of a mold; a holding furnace (2) that is configured to maintain a temperature of a cast slab (10) and/or heats the cast slab (10); and a rolling stand (3) by which finish rolling is performed, the casting speed of the thin slab is set to 4 to 7 m/min, the slab (10) is reduced at a rolling reduction of 30% or more by the reduction roll (4) after solidification is completed and when a center temperature of the slab is 1300° C. or higher, and the slab (10) is held at a temperature of 1150° C. or higher and 1300° C. or lower for five minutes or longer in the holding furnace (2).