公开(公告)号：US20230323500A1

公开(公告)日：2023-10-12

申请号：US18043036

申请日：2021-08-30

Applicant: BAOSHAN IRON & STEEL CO., LTD.

Inventor： Huanrong WANG ,  Feng YANG ,  Chen ZHANG ,  Ana YANG ,  Mingzhou BAI ,  Yaping NI ,  Ming WANG

IPC: C21D9/46 ,  C22C38/54 ,  C22C38/50 ,  C22C38/44 ,  C22C38/28 ,  C22C38/24 ,  C22C38/22 ,  C22C38/16 ,  C22C38/14 ,  C22C38/12 ,  C22C38/08 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C22C33/04 ,  C21D6/00 ,  C21D8/02 ,  C21D1/84

CPC classification number: C21D9/46 ,  C22C38/54 ,  C22C38/50 ,  C22C38/44 ,  C22C38/28 ,  C22C38/24 ,  C22C38/22 ,  C22C38/16 ,  C22C38/14 ,  C22C38/12 ,  C22C38/08 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/002 ,  C22C38/001 ,  C22C33/04 ,  C21D6/001 ,  C21D6/002 ,  C21D6/004 ,  C21D6/005 ,  C21D6/008 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0263 ,  C21D8/0278 ,  C21D1/84

Abstract: A 780 MPa-grade ultra-high reaming steel having high surface quality and high performance stability, and a manufacturing method therefor. The ultra-high reaming steel comprises the following components in percentage by weight: 0.03-0.08% of C, Si≤0.2%, 0.5-2.0% of Mn, P≤0.02%, S≤0.003%, 0.01-0.08% of Al, N≤0.004%, 0.05-0.20% of Ti, 0.1-0.5% of Mo, Mg≤0.005%, O≤0.0030%, and the remainder being Fe and other inevitable impurities. The ultra-high reaming steel of the present invention achieves matching between good structure homogeneity and performance homogeneity and excellent strength, plasticity, and ultra-high reaming rate; the ultra-high reaming steel has yield strength greater than or equal to 750 MPa, tensile strength greater than or equal to 780 MPa, an elongation A50 greater than or equal to 15%, and a reaming rate greater than or equal to 70%; moreover, appearance of red iron scales on the surface of a steel plate can be avoided, thereby improving the surface quality of pickled high-strength steel; the ultra-high reaming steel can satisfy user requirements well, and can be applied to parts of passenger vehicle chassis components such as a control arm and an auxiliary frame, which require high strength and thinning.

公开(公告)号：US20230307158A1

公开(公告)日：2023-09-28

申请号：US18113210

申请日：2023-02-23

Applicant: PROTERIAL, LTD.

Inventor： Daisuke FURUSAWA ,  Futoshi KUNIYOSHI

IPC: H01F1/055 ,  C22C38/00 ,  C22C38/10 ,  C22C38/16 ,  C22C38/14 ,  C22C38/06 ,  C22C33/04 ,  B22F9/02 ,  B22F9/04 ,  B22F1/10 ,  B22F3/16

CPC classification number: H01F1/0557 ,  C22C38/005 ,  C22C38/105 ,  C22C38/16 ,  C22C38/14 ,  C22C38/06 ,  C22C38/002 ,  C22C38/001 ,  C22C33/04 ,  B22F9/023 ,  B22F9/04 ,  B22F1/10 ,  B22F3/162 ,  C22C2202/02 ,  B22F2201/20 ,  B22F2009/044 ,  B22F2009/042 ,  B22F2304/10 ,  B22F2202/05 ,  B22F2301/35 ,  B22F2003/241

Abstract: A sintered R-T-B based magnet includes a main phase formed of an R2T14B compound and a grain boundary phase at grain boundaries of the main phase. The grain boundary phase contains an R-T-M compound (M is at least one selected from the group consisting of Ga, Cu, Zn, Al and Si) and an R-M compound. In any cross-section of the sintered R-T-B based magnet, a sum of an area ratio of the R-T-M compound and an area ratio of the R-M compound is not lower than 1.5% and not higher than 3.5%, the area ratio of the R-T-M compound is not lower than 0.4% and not higher than 2.5%, and the area ratio of the R-M compound is not lower than 0.4% and not higher than 2.5%.

公开(公告)号：US20230295786A1

公开(公告)日：2023-09-21

申请号：US18001894

申请日：2021-06-02

Applicant: THE UNIVERSITY OF HONG KONG

Inventor： Mingxin HUANG ,  Kaiping YU

IPC: C22C38/38 ,  C22C38/30 ,  C22C38/02 ,  C22C33/04 ,  C21D9/46 ,  C21D8/02

CPC classification number: C22C38/38 ,  C22C38/30 ,  C22C38/02 ,  C22C33/04 ,  C21D9/46 ,  C21D8/0205 ,  C21D8/0236

Abstract: The present invention provides a non-magnetic stainless steel with high strength and corrosion resistance and a preparation method thereof. The non-magnetic stainless steel composed of the following components according to percentage by weight: 17%

公开(公告)号：US20230243014A1

公开(公告)日：2023-08-03

申请号：US18011090

申请日：2021-06-30

Applicant: JFE STEEL CORPORATION

Inventor： Shinsuke KOMINE ,  Tatsuya NAKAGAITO ,  Kentaro SATO ,  Tomohiro SAKAIDANI

IPC: C21D9/46 ,  C22C33/04 ,  C22C38/60 ,  C22C38/28 ,  C22C38/32 ,  C22C38/38 ,  C22C38/34 ,  C22C38/16 ,  C22C38/14 ,  C22C38/12 ,  C22C38/08 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C21D8/02 ,  C21D6/00 ,  C21D1/18 ,  C25D3/22 ,  C25D5/36 ,  C25D5/50 ,  C23C2/28 ,  C23C2/40

CPC classification number: C21D9/46 ,  C22C33/04 ,  C22C38/60 ,  C22C38/28 ,  C22C38/32 ,  C22C38/38 ,  C22C38/34 ,  C22C38/16 ,  C22C38/14 ,  C22C38/12 ,  C22C38/08 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/008 ,  C22C38/005 ,  C22C38/002 ,  C22C38/001 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0263 ,  C21D8/0278 ,  C21D6/001 ,  C21D6/002 ,  C21D6/005 ,  C21D6/008 ,  C21D1/18 ,  C25D3/22 ,  C25D5/36 ,  C25D5/50 ,  C23C2/29 ,  C23C2/40 ,  C21D2211/005 ,  C21D2211/008 ,  C21D2211/002 ,  C21D2211/001

Abstract: A galvanized steel sheet includes: a steel sheet having a chemical composition satisfying an equivalent carbon content Ceq of 0.35% or more and less than 0.60%, and a specified steel microstructure; and a galvanized layer on a surface of the steel sheet. The retained austenite has a solute C content of 0.6% or more by mass, and retained austenite grains with an aspect ratio of less than 2.0 constitute 50% or more of all retained austenite grains. In 90-degree bending at a curvature radius/thickness ratio of 4.2 in a rolling (L) direction with respect to an axis extending in a width (C) direction, an L cross section in a 0 to 50 μm region from a surface of the steel sheet on a compression side has a number density of voids of 1000/mm2 or less, and the galvanized steel sheet has a tensile strength of 590 MPa or more.

公开(公告)号：US20230227930A1

公开(公告)日：2023-07-20

申请号：US17927781

申请日：2021-05-25

Applicant: BAOSHAN IRON & STEEL CO., LTD.

Inventor： Wei LI ,  Xiaodong ZHU ,  Peng XUE

IPC: C21D9/00 ,  C22C33/04 ,  C22C38/14 ,  C22C38/12 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C21D6/00 ,  C21D8/02 ,  C21D1/18 ,  C25D3/22 ,  C25D5/36

CPC classification number: C21D9/0081 ,  C21D1/18 ,  C21D6/005 ,  C21D6/008 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0263 ,  C21D8/0278 ,  C22C33/04 ,  C22C38/001 ,  C22C38/02 ,  C22C38/002 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/14 ,  C25D3/22 ,  C25D5/36 ,  C21D2211/005 ,  C21D2211/008

Abstract: Disclosed in the present disclosure is an ultrahigh-strength dual-phase steel. The matrix structure of the ultrahigh-strength dual-phase steel is ferrite and martensite, wherein the ferrite and the martensite are evenly distributed in an island shape. The ultrahigh-strength dual-phase steel contains the following chemical elements in percentage by mass: 0.12-0.2% of C, 0.5-1.0% of Si, 2.5-3.0% of Mn, 0.02-0.05% of Al, 0.02-0.05% of Nb, 0.02-0.05% of Ti, and 0.001-0.003% of B. Further disclosed in the present disclosure is a manufacturing method for the ultrahigh-strength dual-phase steel, comprising the steps of smelting and continuous casting, hot rolling, cold rolling, annealing, tempering, and leveling. The ultrahigh-strength dual-phase steel in the present disclosure has not only good mechanical properties but also excellent delayed cracking resistance and low initial hydrogen content, and can be suitable for manufacturing of vehicle safety structural parts.

公开(公告)号：US20230193436A1

公开(公告)日：2023-06-22

申请号：US18084126

申请日：2022-12-19

Applicant: Chung Yo Materials Co., Ltd.

Inventor： CHIEN-HUNG YEH ,  CHENG-CHIN WANG ,  CHANG-FU WANG ,  YI-JEN LAI ,  HONG-YI CHEN

IPC: C22C33/02 ,  C22C33/04 ,  C22C38/42 ,  C22C38/44 ,  C22C38/04 ,  C22C38/00 ,  B22F10/28

CPC classification number: C22C33/0285 ,  B22F10/28 ,  C22C33/04 ,  C22C38/002 ,  C22C38/04 ,  C22C38/42 ,  C22C38/44 ,  B22F2203/13 ,  B22F2301/35 ,  B22F2998/10 ,  B22F2999/00 ,  B33Y10/00

Abstract: Provided is a stainless steel powder composition, which comprises Cr, Cu, Mn, Mo, Ni and Fe; wherein, based on a total weight of the stainless steel powder composition, a content of Cr is 20 wt% to 24 wt%, and a content of Cu is more than 0 wt% and less than or equal to 0.5 wt%, a content of Mn is more than 0 wt% and less than or equal to 2 wt%, a content of Mo is 2.25 wt% to 3 wt% and a content of Ni is 10 wt% to 15 wt%. When applying the stainless steel powder composition of the present invention to laser additive manufacturing (LAM), the produced stainless steel workpiece has enhanced tensile strength, thereby expanding the follow-up applications and increasing the commercial value.

公开(公告)号：US11680306B2

公开(公告)日：2023-06-20

申请号：US17748901

申请日：2022-05-19

Applicant: TAIYO YUDEN CO., LTD.

Inventor： Yoko Orimo ,  Tomoo Kashiwa

IPC: C22C38/02 ,  C22C33/02 ,  C22C38/18 ,  C22C38/06 ,  C22C33/04 ,  C22C38/14

CPC classification number: C22C38/02 ,  C22C33/0264 ,  C22C33/04 ,  C22C38/06 ,  C22C38/14 ,  C22C38/18 ,  C22C2202/02

Abstract: A method for manufacturing magnetic alloy powder constituted by magnetic grains whose alloy phase is coated with an oxide film, includes: providing a material powder for magnetic alloy whose Fe content is 96.5 to 99 percent by mass and which also contains Si and at least one of non-Si elements (element M) that oxidize more easily than Fe; and heat-treating the material powder and thus forming an oxide film on a surface of each grain constituting the material powder, to obtain a magnetic alloy powder, wherein a content of Fe in the alloy phase is higher than in the material powder; and at a location in the oxide film where its content of Si is in element distributions in a film thickness direction is highest, the content of Si is higher than a content of Fe, and also higher than its content of element M, at the location.

公开(公告)号：US20230151449A1

公开(公告)日：2023-05-18

申请号：US17980888

申请日：2022-11-04

Applicant: The University of Hong Kong

Inventor： Mingxin Huang ,  Chengpeng Huang

IPC: C21D8/06 ,  C22C38/12 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C21D9/52 ,  C21D6/00 ,  C22C33/04

CPC classification number: C21D8/065 ,  C22C38/12 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C21D9/525 ,  C21D6/005 ,  C21D6/008 ,  C22C33/04 ,  C21D2211/001 ,  C21D2211/008

Abstract: The present invention relates to a manufacturing method of 800 MPa grade steel bar and the 800 MPa grade steel bar produced therefrom. The 800 MPa grade steel bar produced by the manufacturing method comprises, in weight percentages, the following composition: carbon, 0.10%-0.30%; manganese, 7.00%-11.00%; aluminum, 1.00%-3.00%; silicon, 0-1.00%; vanadium, 0.05%-0.30%; niobium; 0-0.10%; and the balance of Fe and inevitable impurities; the manufacturing method comprises the steps of smelting to obtain molten steel containing components of the steel bar; forming the molten steel into a billet by casting; heating the billet to a temperature T1 of 1050° C.≤T1≤1200° C. and thermally insulating for 1.5-2.5 hours; performing hot rolling on the thermally insulated billet, the finishing rolling temperature T2 being 500° C.≤T2≤800° C.; and naturally cooling the hot-rolled billet to ambient temperature. The hot-rolled steel bar of the present invention has a dual-phase microstructure of martensite and austenite. The hot rolled steel bar both has a high yield strength of 800-1000 MPa, an ultra-high tensile strength of 1300 MPa-1900 MPa, an ultra-high tensile to yield ratio of 1.6-2.2, and a high uniform elongation of 8%-20%.

公开(公告)号：US20230115623A1

公开(公告)日：2023-04-13

申请号：US17966900

申请日：2022-10-17

Applicant: North China University of Science and Technology

Inventor： Jimeng Liu ,  Shuhuan Wang ,  Dingguo Zhao ,  Yuekai Xue ,  Hao Li ,  Cunshuai Zhang

IPC: C22C38/00 ,  C22C38/02 ,  C22C38/22 ,  C22C38/28 ,  C22C38/04 ,  C21D8/02 ,  B21J1/06 ,  C22C33/04

Abstract: The present invention discloses a high nitrogen steel with high strength, low yield ratio and high corrosion resistance for ocean engineering, comprising the following chemical components by weight percentage: C≤0.01%, Si≤0.1%, Cr 17%-19%, Mn 14%-16%, Mo 1%-1.5%, Ti≤0.05%, N 0.45%-0.6%, P≤0.01%, S≤0.01%, O≤0.02%, and the balance of iron. The present invention also discloses a preparation method as follows: (1) raw material weighing; (2) ingot preparation, remelting and smelting; (3) solution and forging treatments; and (4) hot rolling and post-rolling treatment. A product provided by the present invention has high tensile strength, low yield ratio and high corrosion resistance. At the same time, the present invention does not need pressurized equipment in the preparation process, therefore the preparation method is simple, the cost is low, and the present invention is suitable for industrial popularization in China.

公开(公告)号：US20230077573A1

公开(公告)日：2023-03-16

申请号：US17800924

申请日：2021-02-24

Applicant: NIPPON STEEL Stainless Steel Corporation

Inventor： Yuto SAKAIZAWA ,  Tooru SHIBATA ,  Shin KIKUCHI ,  Shigeo FUKUMOTO

IPC: C22C38/44 ,  C22C38/42 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C22C33/04

Abstract: The stainless steel for metal foils includes, in mass %, 0.0001% or more and 0.15% or less of C, 0.30% or more and 2.0% or less of Si, 0.1% or more and 15% or less of Mn, 0.040% or less of P, 5% or more and 30% or less of Ni, 0.0001% or more and 0.01% or less of S, 16% or more and 25% or less of Cr, 5% or less of Mo, 0.005% or less of Al, 0.0030% or less of Ca, 0.0010% or less of Mg, 0.0010% or more and 0.0060% or less of O, and 0.0001% or more and 0.5% or less of N. The number of inclusions with a maximum equivalent circle diameter of 5 μm or more is 0.5 inclusions/mm2 or less in a thickness of 0.010 mm or more and 0.2 mm or less.