公开(公告)号：US20240301528A1

公开(公告)日：2024-09-12

申请号：US18568929

申请日：2021-06-16

申请人： ArcelorMittal

发明人： Marion FROTEY ,  Bernard RESIAK

IPC分类号： C21D9/52 ,  C21D1/18 ,  C21D6/00 ,  C21D8/06 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54 ,  C22C38/58

CPC分类号： C21D9/525 ,  C21D1/18 ,  C21D6/004 ,  C21D6/005 ,  C21D6/008 ,  C21D8/065 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54 ,  C22C38/58 ,  C21D2211/008

摘要： Method for producing a steel part including by weight: 0.05%≤C≤0.15%, 0.01%≤Si≤1%, 1.2%≤Mn≤2%, 0.1%≤Cr≤2%, 0.001≤Al≤0.1%, 0.003%≤N≤0.01%, 0≤S≤0.015%, 0≤P≤0.015%, 0%≤Ni≤1%, 0%≤B≤0.01%, 0%≤Mo≤1%, 0%≤Ti≤0.04%, 0%≤Nb≤0.1%, 0≤V≤0.5% the remainder consisting of iron and unavoidable impurities, annealing this semi-finished product at an annealing temperature strictly lower than the Ac1 temperature of the steel; cooling it down to room temperature; cold forming the semi-finished product into a cold formed product; subjecting the cold formed product to a heat treatment comprising heating the cold formed product to a heat treatment temperature greater than or equal to the full austenitisation temperature Ac3 of the steel; and quenching to room temperature; optionally reheating the product at a holding temperature from 180° C. to 400° C. for a time from 15 minutes to 2 hours.

公开(公告)号：US20240263286A1

公开(公告)日：2024-08-08

申请号：US18566219

申请日：2022-05-26

申请人： POSCO CO., LTD

发明人： Junmo LEE ,  Seokhwan CHOI ,  Myungsoo CHOI

IPC分类号： C22C38/02 ,  B22D11/00 ,  C21D8/06 ,  C21D9/52 ,  C22C38/04 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26

CPC分类号： C22C38/02 ,  B22D11/005 ,  C21D8/065 ,  C21D9/525 ,  C22C38/04 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C21D2211/002 ,  C21D2211/008 ,  C21D2211/009

摘要： Disclosed are a wire rod and a steel wire for a spring, a spring with improved strength and fatigue limit, and a method for manufacturing the same.
The disclosed wire rod for a spring with improved strength and fatigue limit according to an embodiment includes, in percent by weight (wt %): 0.6 to 0.7% of C, 2.0 to 2.5% of Si, 0.2 to 0.7% of Mn, 0.9 to 1.5% of Cr, 0.015% or less of P, 0.01% or less of S, 0.01% or less of Al, 0.01% or less of N, 0.25% or less of Mo, 0.25% or less of W, 0.05% to 0.2% of V, 0.05% or less of Nb, and the balance of Fe and unavoidable impurities, wherein Mn+Cr≤1.8% and 0.05 at %≤Mo+W≤0.15 at % may be satisfied.

公开(公告)号：US20240254588A1

公开(公告)日：2024-08-01

申请号：US18561348

申请日：2022-06-08

申请人： POSCO Co., Ltd

发明人： Byoung-Gab LEE ,  In-Gyu PARK ,  Jae-Seung LEE ,  Se-Hee KIM ,  Dae-Hwan KIM

IPC分类号： C21D9/52 ,  C21D8/06 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/18

CPC分类号： C21D9/525 ,  C21D8/065 ,  C22C38/001 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/18 ,  C21D2211/003 ,  C21D2211/009

摘要： The present invention relates to a machine structure wire rod, which is applicable to vehicles, construction components and the like, and a manufacturing method therefor, and to a wire rod having excellent drawability, and a method for manufacturing same.

公开(公告)号：US12043885B2

公开(公告)日：2024-07-23

申请号：US17253222

申请日：2019-07-09

申请人： NIPPON STEEL CORPORATION

发明人： Daisuke Matsuo ,  Yusaku Tomio

IPC分类号： C22C38/50 ,  C21D8/00 ,  C21D8/06 ,  C21D9/08 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/48

CPC分类号： C22C38/50 ,  C21D8/005 ,  C21D8/065 ,  C21D9/085 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/48 ,  C21D2211/001 ,  C21D2211/005 ,  C21D2211/008

摘要： The chemical composition of the seamless steel pipe contains Cr: 15.00 to 18.00% in mass % and satisfies Formulae (1) and (2). Furthermore, in the microstructure, (I) a total volume ratio of ferrite and martensite is 80% or more, with the balance being retained austenite of a volume ratio of 20% or less, (II) the number of intersections NTL in the L-direction observation field of view is 38 or more and NTL/NL is 1.80 or more, and further (III) the number of intersections NTC in the C-direction observation field of view is 30 or more and NTC/NC is 1.70 or more.

156Al+18Ti+12Nb+11Mn+5V+328.125N+243.75C+12.5S≤12.5  (1)

Ca/S≥4.0  (2)

公开(公告)号：US20240183010A1

公开(公告)日：2024-06-06

申请号：US18285775

申请日：2022-04-14

申请人： TOKYO ROPE MFG. CO., LTD.

发明人： Kazuhiro ISHIMOTO

IPC分类号： C22C38/00 ,  C21D1/20 ,  C21D1/40 ,  C21D8/06 ,  C21D9/52

CPC分类号： C22C38/00 ,  C21D1/20 ,  C21D1/40 ,  C21D8/065 ,  C21D9/525

摘要： Provided is a wiredrawn product drawn from a heat-treated steel containing: 0.38 to 1.05% by mass of C; 0.0 to 1.0% by mass of Mn; 0.0 to 0.50% by mass of Cr; and 0.0 to 1.5% by mass of Si, with the remainder being Fe and unavoidable impurities, wherein a GOS value/average crystal grain size is greater than or equal to −0.6×GAM value+1.5 at a grain boundary setting angle of 2° and a step number of 0.07 μm.

公开(公告)号：US20240060162A1

公开(公告)日：2024-02-22

申请号：US18268061

申请日：2021-12-14

申请人： POSCO CO., LTD

发明人： Youngsoo CHUN ,  Sang-yoon LEE ,  Seok-hwan CHOI ,  Myungsoo CHOI

IPC分类号： C22C38/04 ,  C21D8/06 ,  C21D9/52 ,  C22C38/00 ,  C22C38/02 ,  C22C38/14

CPC分类号： C22C38/04 ,  C21D8/065 ,  C21D9/525 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/14 ,  C21D2211/001 ,  C21D2211/008

摘要： Disclosed are wire rods and parts with improved delayed fracture resistance, and methods for manufacturing the same. The wire rod with improved delayed fracture resistance according to the present disclosure contains, by wt %, 0.15-0.30% of C, 0.15-0.25% of Si, 0.95-1.35% of Mn, 0.030% or less of P, 0.030% or less of S, 0.015-0.030% of Ti, 0.0010-0.0040% of B, 0.0010-0.0080% of N, and Fe and inevitable impurities as the balance, and satisfies formula 1 of 2.0≤5.5×[Si]+[Mn]≤2.4, where [Si] and [Mn] represent the contents (wt %) of the corresponding elements.

公开(公告)号：US20240052453A1

公开(公告)日：2024-02-15

申请号：US18267556

申请日：2021-11-18

申请人： POSCO

发明人： Junmo LEE ,  Seok-hwan CHOI ,  Myungsoo CHOI

IPC分类号： C21D9/52 ,  C22C38/34 ,  C22C38/24 ,  C22C38/22 ,  C22C38/06 ,  C22C38/04 ,  C22C38/00 ,  C21D8/06 ,  C21D6/00 ,  C21D1/84 ,  C21D1/18 ,  B21F3/02 ,  F16F1/04

CPC分类号： C21D9/525 ,  C22C38/34 ,  C22C38/24 ,  C22C38/22 ,  C22C38/06 ,  C22C38/04 ,  C22C38/002 ,  C22C38/001 ,  C21D8/065 ,  C21D6/002 ,  C21D6/005 ,  C21D6/008 ,  C21D1/84 ,  C21D1/18 ,  B21F3/02 ,  F16F1/04 ,  C22C2202/02 ,  C21D2211/009 ,  C21D2211/001

摘要： Disclosed are a wire rod and a steel wire for a spring, a spring with improved fatigue resistance and nitriding property, and methods for manufacturing same. The wire rod for a spring with improved fatigue resistance and nitriding property according to the present disclosure contains, by wt %, 0.6-0.7% of C, 2.0-2.5% of Si, 0.2-0.5% of Mn, 0.9-1.6% of Cr, 0.015% of less of P, 0.01% of less of S, 0.01% of less of Al, 0.007% of less of N, 0.1-0.25% of Mo, 0.1-0.25% of V, and Fe and inevitable impurities as the balance, wherein Cr+Mn is 1.8% or less, Mo/V is 1.5 or less, and the microstructure includes 60% or more of a pearlite structure in the C section.

公开(公告)号：US20230392244A1

公开(公告)日：2023-12-07

申请号：US17754748

申请日：2020-10-15

申请人： NIPPON STEEL CORPORATION ,  NIPPON STEEL SG WIRE CO., LTD.

发明人： Shinya TERAMOTO ,  Yutaka NEISHI ,  Michimasa AONO ,  Shuji KOZAWA ,  Satoru MINETA ,  Tatsuro OCHI ,  Shoichi SUZUKI

IPC分类号： C22C38/54 ,  C22C38/50 ,  C22C38/48 ,  C22C38/46 ,  C22C38/44 ,  C22C38/42 ,  C22C38/34 ,  C22C38/06 ,  C22C38/04 ,  C22C38/00 ,  C21D9/52 ,  C21D8/06 ,  C21D6/00 ,  C21D1/18 ,  C21D9/02 ,  C21D1/30 ,  C21D1/74 ,  B21C1/00 ,  B21C37/04

CPC分类号： C22C38/54 ,  F16F1/021 ,  C22C38/48 ,  C22C38/46 ,  C22C38/44 ,  C22C38/42 ,  C22C38/34 ,  C22C38/06 ,  C22C38/04 ,  C22C38/002 ,  C22C38/001 ,  C21D9/525 ,  C21D8/065 ,  C21D6/004 ,  C21D6/005 ,  C21D6/008 ,  C21D1/18 ,  C21D9/02 ,  C21D1/30 ,  C21D1/74 ,  B21C1/003 ,  B21C37/045 ,  C22C2202/02 ,  C21D2211/008 ,  C22C38/50

摘要： A steel wire which has an excellent fatigue limit when made into a spring is provided. A chemical composition of the steel wire according to the present embodiment consists of, in mass %, C: 0.53 to 0.59%, Si: 2.51 to 2.90%, Mn: 0.70 to 0.85%, P: 0.020% or less, S: 0.020% or less, Cr 1.40 to 1.70%, Mo: 0.17 to 0.53%, V: 0.23 to 0.33%, Cu: 0.050% or less, Ni: 0.050% or less, Al: 0.0050% or less, Ti: 0.050% or less, N: 0.0070% or less, Ca: 0 to 0.0050%, and Nb: 0 to 0.020%, with the balance being Fe and impurities. In the steel wire, a number density of V-based precipitates having a maximum diameter ranging from 2 to 10 nm is 500 to 8000 pieces/μm2.

公开(公告)号：US20230295784A1

公开(公告)日：2023-09-21

申请号：US18020999

申请日：2021-08-16

申请人： BAOSHAN IRON & STEEL CO., LTD.

发明人： Zan YAO ,  Feng JIN ,  Ziquan YU ,  Zongze HUANG ,  Sixin ZHXO ,  Haoyang ZHAO ,  Ruiyin ZHAI

IPC分类号： C22C38/24 ,  C22C38/02 ,  C22C38/04 ,  C22C38/00 ,  C21D8/06

CPC分类号： C22C38/24 ,  C22C38/02 ,  C22C38/04 ,  C22C38/002 ,  C21D8/065 ,  C21D2211/008 ,  C21D2211/003

摘要： A high-strength and high-fatigue-life steel for a cable, which comprises, in addition to Fe, the following chemical elements in percentages by mass: 0.90-1.00% of C; 0.90-1.50% of Si; 0.25-0.58% of Mn; 0.20-1.00% of Cr; 0.03-0.12% of V; and 0.0008-0.0025% of Ca. In addition, further provided are a wire rod made of the high-strength and high-fatigue-life steel for a cable and a preparation method for the wire rod.

公开(公告)号：US20230151449A1

公开(公告)日：2023-05-18

申请号：US17980888

申请日：2022-11-04

申请人： The University of Hong Kong

发明人： Mingxin Huang ,  Chengpeng Huang

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

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

摘要： 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%.