公开(公告)号：US20250043376A1

公开(公告)日：2025-02-06

申请号：US18719104

申请日：2022-12-13

Applicant: POSCO CO., LTD.

Inventor： Byungin JUNG ,  Youngsoo CHUN ,  Yongsik PARK

IPC: C21D9/00 ,  C21D1/18 ,  C21D1/84 ,  C21D6/00 ,  C21D8/00 ,  C21D8/06 ,  C21D9/52 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/28 ,  C22C38/32

Abstract: The present disclosure relates to methods for manufacturing a wire rod for cold forging and a screw part, which may manufacture with only quenching heat treatment a part with excellent drilling characteristics, and which may specifically manufacture a part to be used for mechanical coupling of automotive parts manufactured with different materials.

公开(公告)号：US20250019787A1

公开(公告)日：2025-01-16

申请号：US18715947

申请日：2021-12-10

Applicant: ArcelorMittal

Inventor： Xavier GARAT ,  Pascal LORENZINI

IPC: C21D9/46 ,  B32B15/01 ,  C21D1/84 ,  C21D6/00 ,  C21D8/02 ,  C22C38/00 ,  C22C38/04 ,  C22C38/06

Abstract: A low density hot rolled steel including of 0.12%≤carbon≤0.25%, 3%≤manganese≤10%, 3.5%≤aluminum≤6.5%, 0%≤phosphorus≤0.1%, 0%≤sulfur≤0.03%, 0%≤nitrogen≤0.1%, 0%≤silicon≤2%, 0.01%≤niobium≤0.03%, 0.01%≤titanium≤0.2%, 0%≤molybdenum≤0.5%, 0%≤chromium≤0.6%, 0.01%≤copper≤2.0%, 0.01%≤nickel≤3.0%, 0%≤calcium≤0.005%, 0%≤boron≤0.01%, 0%≤Magnesium≤0.005%, 0%≤Zirconium≤0.005%, 0%≤Cerium≤0.1%, and the balance including iron and unavoidable impurities, the steel sheet having a microstructure including of ferrite from 60% to 80%, 10% to 35% kappa carbides (Fe,Mn)3AlCx, where x is lower than or equal to 1 and austenite from 0% to 10% wherein the microstructure grains having less than 4 GPa nano-hardness must be more than 45% and microstructure grains having nano-hardness of more than 5 GPa must be less than 10%.

公开(公告)号：US20250011891A1

公开(公告)日：2025-01-09

申请号：US18711815

申请日：2022-08-29

Applicant: Baoshan Iron & Steel Co., Ltd.

Inventor： Sixin Zhao ,  Chengquan Wang

IPC: C21D9/00 ,  B22D11/00 ,  B22D17/00 ,  C21D1/18 ,  C21D1/84 ,  C21D6/00 ,  C21D8/00 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50

Abstract: Disclosed in the present disclosure is a steel. Apart from 90% or more by mass Fe and inevitable impurities, the steel further contains the following chemical elements in percentage by mass: C: 0.22-0.33%, Si: 0.1-1.0%, Mn: 0.3-1.5%, Cr: 0.2-1.6%, Ni: 2.2-3.8%, Mo: 0.1-0.7%, Cu: 0.02-0.3%, Al: 0.01-0.045%, V: 0.01-0.25%, and N≤0.013%. Further disclosed in the present disclosure is a method for manufacturing the steel, comprising: (1) smelting and casting; (2) forging or rolling, involving processing a casting blank to a finished product size by using a roll-in-one-heat process or roll-in-two-heat process; and (3) quenching and tempering: wherein the heating temperature of quenching is 860-1000° C., the holding time is 2-6 h, and water cooling is performed after the quenching; and the tempering temperature is 400-600° C., the holding time is 1-4 h, and air cooling to room temperature is performed after tempering. The steel of the present disclosure has high strength, well matched toughness and plasticity, and good weather resistance, thereby having good application prospects.

公开(公告)号：US20250003022A1

公开(公告)日：2025-01-02

申请号：US18711439

申请日：2022-11-07

Applicant: POSCO CO., LTD

Inventor： Jong-Pan Kong ,  Young-Roc Im

IPC: C21D9/46 ,  C21D1/18 ,  C21D1/74 ,  C21D1/84 ,  C21D6/00 ,  C21D8/02 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/22 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/38 ,  C23C2/02 ,  C23C2/26 ,  C23C2/40

Abstract: The present invention relates to a cold rolled steel sheet and a manufacturing method therefor, and, more specifically, to a cold rolled steel sheet and a manufacturing method therefor, the cold rolled steel sheet having excellent strength and formability, which can be preferably applied to a structure member such as the members, seat rails, and pillars of a vehicle, and the like.

公开(公告)号：US20240355515A1

公开(公告)日：2024-10-24

申请号：US18548206

申请日：2022-01-17

Applicant: FUJIAN GOLDEN DRAGON RARE-EARTH Co., Ltd.

Inventor： Weiguo Mou ,  Jiaying Huang

IPC: H01F1/057 ,  B22F3/16 ,  B22F3/24 ,  B22F9/02 ,  B22F9/04 ,  C21D1/84 ,  C21D6/00 ,  C22C33/04 ,  C22C38/00 ,  C22C38/10 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  H01F41/02

CPC classification number: H01F1/0577 ,  B22F3/16 ,  B22F3/24 ,  B22F9/023 ,  B22F9/04 ,  C21D1/84 ,  C21D6/007 ,  C22C33/04 ,  C22C38/002 ,  C22C38/005 ,  C22C38/10 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  H01F41/0293 ,  B22F2003/248 ,  B22F2009/044 ,  B22F2202/05 ,  B22F2301/355 ,  B22F2998/10 ,  B22F2999/00 ,  C22C2202/02

Abstract: Disclosed are an R-T-B magnet and a preparation method therefor. The R-T-B magnet comprises the following components: R≥29 wt. %, R being a rare earth element and containing Nd, wherein Nd is ≥22 wt. %; 0.2-0.75 wt. % of Ti+Nb; 0.05-0.45 wt. % of Cu; 0.955-1.15 wt. % of B; and 58-69 wt. % of Fe, wherein wt. % is the ratio of the mass of each component to the total mass of the components; and the mass ratio of Ti to Nb is (1-5):1. According to the present invention, the matching relationship among the added elements in the R-T-B magnet is further optimized, and an R-T-B magnet with better magnetic properties such as relatively high residual magnetization, coercivity, and squareness can be prepared by using the formula.

公开(公告)号：US20240344187A1

公开(公告)日：2024-10-17

申请号：US18294044

申请日：2022-11-17

Applicant: POSCO Co., Ltd

Inventor： Hyoung-Jin PARK

IPC: C22C38/38 ,  C21D1/84 ,  C21D6/00 ,  C21D8/02 ,  C21D9/46 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06

CPC classification number: C22C38/38 ,  C21D1/84 ,  C21D6/002 ,  C21D6/005 ,  C21D6/008 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0263 ,  C21D9/46 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C21D2211/001

Abstract: The present invention pertains to: a hot-rolled steel plate; a steel tube; and methods for manufacturing the steel plate and steel tube. More specifically, the present invention pertains to: a high manganese hot-rolled steel plate having excellent abrasion resistance; a steel tube manufactured using the hot-rolled steel plate; and methods for manufacturing the steel plate and steel tube.

公开(公告)号：US20240229182A1

公开(公告)日：2024-07-11

申请号：US18364840

申请日：2023-08-03

Applicant: GM Global Technology Operations LLC

Inventor： Zhou WANG ,  Zhisong Chai ,  Wei Xu ,  Jianfeng Wang

IPC: C21D9/46 ,  B32B15/01 ,  C21D1/74 ,  C21D1/84 ,  C21D6/00 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/20 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/38 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/58 ,  C23C2/06 ,  C23C2/40

CPC classification number: C21D9/46 ,  B32B15/013 ,  C21D1/74 ,  C21D1/84 ,  C21D6/002 ,  C21D6/004 ,  C21D6/005 ,  C21D6/008 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/20 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/38 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/58 ,  C23C2/06 ,  C23C2/40 ,  C21D2211/001 ,  C21D2211/002 ,  C21D2211/005 ,  C21D2211/008

Abstract: A coated steel sheet includes a steel sheet comprising iron (Fe); carbon (C) in a range from 0.05% to 0.35 wt. %; manganese (Mn) in a range from 0.1% to less than 2 wt. %; chromium (Cr) in a range from 1.2% to 6.0 wt. %; silicon (Si) in a range from 0.01% to less than 0.6 wt. %; aluminum (Al) in a range from 0.5% to 1.3 wt. %; vanadium (V) in a range from 0.01% to 0.5 wt. %; niobium (Nb) in a range from 0.01% to 0.2 wt. %; and titanium (Ti) in a range from 0.01% to 0.3 wt. %. A zinc coating is formed on an outer surface of the steel sheet.

公开(公告)号：US12024754B2

公开(公告)日：2024-07-02

申请号：US18247564

申请日：2022-12-08

Applicant: DAYE SPECIAL STEEL CO., LTD.

Inventor： Xiaoliang Dong ,  Xiuli Zhang ,  Lixin Zhou ,  Yinghua Lei ,  Xianhua Wang ,  Guangpeng Xu ,  Peng Xu ,  Guoyang Sun ,  Zaoyu Li ,  Jun Zhang ,  Dong Ruan

IPC: C21D9/52 ,  C21C5/00 ,  C21C5/52 ,  C21D1/84 ,  C21D6/00 ,  C21D8/10 ,  C22C33/04 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/42 ,  C22C38/48 ,  C22C38/52 ,  C22C38/54

CPC classification number: C21D9/525 ,  C21C5/005 ,  C21C5/52 ,  C21D1/84 ,  C21D6/004 ,  C21D6/005 ,  C21D6/007 ,  C21D6/008 ,  C21D8/105 ,  C22C33/04 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/42 ,  C22C38/48 ,  C22C38/52 ,  C22C38/54 ,  C21D2211/001

Abstract: A method for manufacturing a low-carbon nitrogen-containing austenitic stainless steel bar sequentially includes smelting, electroslag remelting, and forging. During electroslag remelting, the steel ingot obtained in the smelting process is used as an electrode bar of the electroslag furnace and is remelted with specific slag and crystallized. The specific slag comprises CaF2 (65-70%), Al2O3 (15-20%), CaO (5-10%) and MgO (2-5%) in percentage by weight. Specific forging methods, including upsetting-and-drawing and radial forging, are used. In upsetting-and-drawing, the pass deformation is less than 35%, the pass reduction is 50-80 mm, the pass heating temperature is 1130-1150° C., and the pass deformation method is ellipse-ellipse-circle. The method can obtain the low-carbon high-strength nitrogen-containing austenitic stainless steel with uniformly distributed chemical composition, high purity and high strength.

公开(公告)号：US20240209469A1

公开(公告)日：2024-06-27

申请号：US18563290

申请日：2022-05-25

Applicant: BAOSHAN IRON & STEEL CO., LTD.

Inventor： Zan Yao ,  Ziquan Yu ,  Feng Jin ,  Sixin Zhao ,  Haoyang Zhao

IPC: C21D9/00 ,  C21C7/10 ,  C21D1/18 ,  C21D1/32 ,  C21D1/84 ,  C21D6/00 ,  C21D8/00 ,  C22C33/04 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46

CPC classification number: C21D9/0093 ,  C21C7/10 ,  C21D1/18 ,  C21D1/32 ,  C21D1/84 ,  C21D6/004 ,  C21D6/005 ,  C21D6/008 ,  C21D8/005 ,  C22C33/04 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C21D2211/00

Abstract: The present invention discloses a steel for bolts, which comprises the following chemical elements in percentage by mass in addition to Fe and inevitable impurities: C: 0.37 to 0.45%; Si: 0.01 to 0.08%; Mn: 0.45 to 0.80%; Cr: 0.90 to 1.30%; Mo: 0.20 to 0.45%; Ni: 0.10 to 0.30%; V: 0.15 to 0.30%; and Al: 0.015 to 0.035%. The present invention further discloses a method for manufacturing the steel for bolts, which comprises the following steps: (1) smelting; (2) casting; (3) rough rolling; (4) high-speed wire rolling; (5) Stelmor controlled cooling; and (6) heat treatment, wherein the holding temperature of spheroidizing heat treatment is 760 to 790° C. and the holding time is 4 to 12 h, followed by a slow cooling process after the holding with a cooling speed of lower than 40° C./h. The drawing area reduction rate of a coil rod is controlled to 5 to 30%. The heating temperature of quenching and tempering heat treatment is 850 to 950° C. The tempering temperature is 500 to 600° C. The steel for bolts disclosed in the present invention has a uniform structure and performance, has low production costs, and has high strength and good delayed fracture resistance.

公开(公告)号：US20240175102A1

公开(公告)日：2024-05-30

申请号：US18550132

申请日：2022-02-28

Applicant: JFE STEEL CORPORATION

Inventor： Shimpei YOSHIOKA ,  Shinjiro KANEKO ,  Yuma HONDA

IPC: C21D9/46 ,  C21D1/18 ,  C21D1/84 ,  C21D6/00 ,  C21D8/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/22 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/38 ,  C22C38/60

CPC classification number: C21D9/46 ,  C21D1/18 ,  C21D1/84 ,  C21D6/002 ,  C21D6/005 ,  C21D6/008 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0263 ,  C21D8/0278 ,  C22C38/001 ,  C22C38/002 ,  C22C38/005 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/22 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/38 ,  C22C38/60 ,  C21D2211/008

Abstract: To provide a steel sheet with a tensile strength of 1310 MPa or more that can achieve excellent press formability in a steel having a martensite-dominant microstructure with excellent delayed fracture resistance properties. Disclosed is a steel sheet including: a chemical composition containing, by mass %, C: 0.12-0.40%, Si: 1.5% or less, Mn: more than 1.7% and 3.5% or less, P: 0.05% or less, S: 0.010% or less, sol.Al: 1.00% or less, N: 0.010% or less, Ti: 0.002-0.080%, and B: 0.0002-0.0050%, with the balance being Fe and inevitable impurities; a metallic structure in which an area ratio of martensite to an entire microstructure is 85% or more, and a ratio LS/LB satisfies a predetermined formula (1), where LS denotes a length of a sub-block boundary and LB denotes a length of a block boundary; and a tensile strength of 1310 MPa or more.