公开(公告)号：US20240209469A1

公开(公告)日：2024-06-27

申请号：US18563290

申请日：2022-05-25

申请人： BAOSHAN IRON & STEEL CO., LTD.

发明人： Zan Yao ,  Ziquan Yu ,  Feng Jin ,  Sixin Zhao ,  Haoyang Zhao

IPC分类号： 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分类号： 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

摘要： 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：US20240076766A1

公开(公告)日：2024-03-07

申请号：US18268511

申请日：2021-12-10

申请人： POSCO Co., Ltd

发明人： Sun-Mi KIM ,  Jae-Hun CHOI ,  Hak-Jun KIM

IPC分类号： C22C38/26 ,  C21D1/18 ,  C21D1/32 ,  C21D6/00 ,  C21D8/02 ,  C21D9/46 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/22 ,  C22C38/24

CPC分类号： C22C38/26 ,  C21D1/18 ,  C21D1/32 ,  C21D6/002 ,  C21D6/005 ,  C21D6/008 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0263 ,  C21D9/46 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/22 ,  C22C38/24 ,  C21D2211/003 ,  C21D2211/005 ,  C21D2211/008 ,  C21D2211/009

摘要： Provided are a QT heat treated high carbon hot rolled steel sheet, a high carbon cold rolled steel sheet, a QT heat treated high carbon cold rolled steel sheet, and manufacturing methods thereof, wherein the QT heat treated high carbon hot rolled steel sheet comprises, in weight %, C: 1.0-1.4%, Si: 0.1-0.4%, Mn: 0.1-0.8%, Cr: 0.3-11%, W: 0.05-2.5%, P: 0.03% or less, S: 0.03% or less, Al: 0.02% or less, and the balance being Fe and other inevitable impurities, the average size of carbides being 0.1-20 μm.

公开(公告)号：US20240068078A1

公开(公告)日：2024-02-29

申请号：US18015946

申请日：2022-03-09

申请人： HEBEI VOCATIONAL UNIVERSITY OF INDUSTRY AND TECHNOLOGY

发明人： Shuang LI ,  Zhen CAO ,  Zhen WANG ,  Yanlin Shi ,  Long LIU ,  Lulu ZHAO ,  Ziliang Wang ,  Yongliang Shi ,  Chenlong Wang ,  Yunchang Huo

IPC分类号： C22C38/12 ,  C21D1/18 ,  C21D1/32 ,  C21D6/00 ,  C22C38/00 ,  C22C38/10

CPC分类号： C22C38/12 ,  C21D1/18 ,  C21D1/32 ,  C21D6/007 ,  C22C38/005 ,  C22C38/10 ,  C21D2211/008

摘要： A die steel with a high thermal diffusion coefficient includes 0.30-0.40 wt. % of C, 0.05-0.10 wt. % of Si, 2.50-3.40 wt. % of Mo, 0.01-0.05 wt. % of Nb, 0.30-0.50 wt. % of Co, 0.01-0.05 wt. % of RE, the rest is Fe and unavoidable impurities, wherein in the die steel, P≤0.15 wt. %, S≤0.025 wt. %. A preparation method of the die steel includes steps of melting, electroslag remelting, electroslag ingot annealing, forging, spheroidizing annealing, quenching and tempering.

公开(公告)号：US20240018621A1

公开(公告)日：2024-01-18

申请号：US18268549

申请日：2021-12-10

申请人： POSCO CO., LTD

发明人： Je-Wook JANG ,  Hak-Jun KIM ,  Sun-Mi KIM

IPC分类号： C21D9/46 ,  C22C38/18 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C21D8/02 ,  C21D1/32 ,  C21D1/18 ,  C21D6/00

CPC分类号： C21D9/46 ,  C22C38/18 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/008 ,  C22C38/002 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0263 ,  C21D8/0268 ,  C21D1/32 ,  C21D1/18 ,  C21D6/002 ,  C21D6/005 ,  C21D6/008 ,  C21D2211/008 ,  C21D2211/005 ,  C21D2211/002 ,  C21D2211/001

摘要： One embodiment of the present invention provides: a high toughness high carbon cold rolled steel sheet having excellent formability comprising, by weight %, C: 0.80% to 1.25%, Mn: 0.2% to 0.6%, Si: 0.01% to 0.4%, P: 0.005% to 0.02%, S: 0.01% or less, Al: 0.01% to 0.1%, Cr: 0.01% to 1.0%, Sn: 0.05% to 0.5%, the remainder being Fe and other unavoidable impurities, in which a microstructure includes, by area %, retained austenite: 1% to 10%, martensite: 1% to 10%, ferrite: 5% or less (including 0%), the remainder being bainite, and has an average grain size of 3 μm to 20 μm, and an internal oxide layer formed directly below the surface has a thickness of 10 μm or less; and a method for manufacturing same.

公开(公告)号：US11198920B2

公开(公告)日：2021-12-14

申请号：US16691951

申请日：2019-11-22

申请人： Hyundai Motor Company ,  Kia Motors Corporation ,  Hyundai Steel Company

发明人： Jae-Yoon Hwang ,  Min-Woo Kang ,  Shin-Woong Jeong ,  Soon-Jae Won ,  Sang-Min Song ,  Seung-Hyun Hong ,  Min-Woo Kang

IPC分类号： C21D9/52 ,  C22C38/44 ,  C22C38/04 ,  C22C38/02 ,  C21D1/32 ,  B21B3/00 ,  C21D6/00 ,  C23C8/32 ,  C23C8/80 ,  C21D8/06

摘要： Disclosed is a method for manufacturing high-carbon bearing steel, which include: heating a billet at a temperature of about 950 to 1,050° C. for about 70 to 120 minutes, rolling the billet to manufacture a wire rod, winding the wire rod to manufacture a wire rod coil, cooling the wire rod coil, and subsequently heat treating the wire rod coil for spheroidizing and carbonitriding, respectively. The bearing steel may include an amount of about 0.9 to 1.3 wt % of carbon (C), an amount of about 1.1 to 1.6 wt % of silicon (Si), an amount of about 1.0 to 1.5 wt % of manganese (Mn), an amount of about 1.5 to 1.9 wt % of chromium (Cr), an amount of about 0.2 to 0.6 wt % of nickel (Ni), an amount of about 0.1 to 0.3 wt % of molybdenum (Mo), and the balance iron (Fe) based on the total weight thereof.

公开(公告)号：US11168387B2

公开(公告)日：2021-11-09

申请号：US16639231

申请日：2018-08-24

申请人： Nippon Steel Corporation ,  JTEKT Corporation

发明人： Tomohiro Yamashita ,  Takahisa Suzuki ,  Yutaka Neishi ,  Daisuke Hirakami ,  Kohei Kanetani ,  Takashi Sada

IPC分类号： C22C38/46 ,  C21D1/06 ,  C21D1/32 ,  C21D6/00 ,  C21D9/40 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/44 ,  C23C8/22 ,  F16C33/62

摘要： The steel material for a carburized bearing part according to the present invention contains, by mass %, C: 0.25 to 0.45%, Si: 0.15 to 0.45%, Mn: 0.40 to 1.50%, P: 0.015% or less, S: 0.005% or less, Cr: 0.60 to 2.00%, Mo: 0.10 to 0.35%, V: 0.20 to 0.40%, Al: 0.005 to 0.100%, Ca: 0.0002 to 0.0010%, N: 0.0300% or less and O: 0.0015% or less, with the balance being Fe and impurities, and satisfies Formulae (1) to (3). 1.20 0.50  (2) 2.7C+0.4Si+Mn+0.45Ni+0.8Cr+Mo+V>2.55  (3) Formula (2) shows an area fraction of sulfides containing Ca in an amount of 1 mol % or more among sulfides having an equivalent circular diameter of 1 μm or more.

公开(公告)号：US10934609B2

公开(公告)日：2021-03-02

申请号：US16346461

申请日：2018-08-30

申请人： NIPPON STEEL CORPORATION

发明人： Yuri Toda ,  Kazuo Hikida ,  Motonori Hashimoto

IPC分类号： C22C38/04 ,  C21D1/32 ,  C21D8/02 ,  C21D9/46 ,  C22C38/00 ,  C22C38/02 ,  C22C38/06 ,  C22C38/08 ,  C22C38/10 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/32 ,  C23C8/22

摘要： [Object] To provide a steel sheet for carburizing that demonstrates improved extreme deformability prior to carburizing, and a method for manufacturing the same.
[Solution] A steel sheet consisting of, in mass %, C: more than or equal to 0.02%, and less than 0.30%, Si: more than or equal to 0.005%, and less than 0.5%, Mn: more than or equal to 0.01%, and less than 3.0%, P: less than or equal to 0.1%, S: less than or equal to 0.1%, sol. Al: more than or equal to 0.0002%, and less than or equal to 3.0%, N: less than or equal to 0.2%, and the balance: Fe and impurities, in which average value of X-ray random intensity ratio, assignable to an orientation group of ferrite crystal grain ranging from {100} to {223} , is 7.0 or smaller, average equivalent circle diameter of carbide is 5.0 μm or smaller, percentage of number of carbides with an aspect ratio of 2.0 or smaller is 80% or larger relative to the total carbides, and percentage of number of carbides present in the ferrite crystal grain is 60% or larger relative to the total carbides.

公开(公告)号：US10851445B2

公开(公告)日：2020-12-01

申请号：US15342078

申请日：2016-11-02

申请人： The NanoSteel Company, Inc.

发明人： Charles D. Tuffile ,  Harald Lemke ,  Patrick E. Mack

IPC分类号： C22C38/58 ,  B23K15/00 ,  B23K26/00 ,  B23K26/342 ,  B33Y10/00 ,  B33Y70/10 ,  B33Y80/00 ,  C22C38/04 ,  C22C38/34 ,  C22C38/54 ,  B22F3/105 ,  C21D6/00 ,  C21D1/26 ,  C21D1/32 ,  C22C38/02 ,  C21D6/02 ,  C22C33/02 ,  B22F3/00 ,  B33Y70/00 ,  B23K101/20 ,  B23K103/04 ,  B23K103/10 ,  B23K101/04 ,  B23K101/06 ,  B23K101/10 ,  B23K101/12 ,  B22F3/24 ,  B22F7/04 ,  B22F7/06

摘要： The present disclosure is directed at alloys and method for layer-by-layer deposition of metallic alloys on a substrate to produce a metallic part. Applications for the metallic parts include pumps, pump parts, valves, molds, bearings, cutting tools, filters or screens.

公开(公告)号：US10704125B2

公开(公告)日：2020-07-07

申请号：US15346885

申请日：2016-11-09

申请人： CRS Holdings, Inc. ,  Olivier Schiess ,  Pierre Marechal

发明人： Olivier Schiess ,  Pierre Marechal ,  Gregory J. Del Corso ,  Alberto Polar-Rosas

IPC分类号： B22F3/24 ,  B22F3/15 ,  B22F5/12 ,  B22F9/06 ,  C21D9/52 ,  C21D8/06 ,  C21D6/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/08 ,  C22C38/12 ,  C22C38/18 ,  C22C38/24 ,  C22C38/40 ,  C22C38/16 ,  C22C38/42 ,  C22C38/60 ,  C22C38/22 ,  C22C38/44 ,  C22C33/02 ,  C22C38/46 ,  C21D1/32 ,  B22F9/08 ,  C22C38/00

摘要： A method of making a small diameter elongated steel article such as wire or strip is disclosed. The method includes the step of melting a steel alloy having the following weight percent composition C0.88-1.00 Mn0.20-0.80 Si0.50max. P0.050max. S0.010-0.100 Cr0.15-0.90 Ni0.10-0.50 Mo0.25max. Cu0.08-0.23 V0.025-0.15  N0.060max. O0.040max. and the balance is iron and usual impurities. The method includes melting the alloy, atomizing the molten alloy to make a pre-alloyed metal powder, consolidating the metal powder to substantially full density, and then hot working the consolidated metal powder to form an intermediate elongated article. The method further includes a multi-step heat treating process. A small diameter, elongated steel article having enhanced machinability is also disclosed.

公开(公告)号：US20200208246A1

公开(公告)日：2020-07-02

申请号：US16639231

申请日：2018-08-24

申请人： Nippon Steel Corporation ,  JTEKT Corporation

发明人： Tomohiro Yamashita ,  Takahisa Suzuki ,  Yutaka Neishi ,  Daisuke Hirakami ,  Kohei Kanetani ,  Takashi Sada

IPC分类号： C22C38/46 ,  C22C38/44 ,  C22C38/32 ,  C22C38/28 ,  C22C38/26 ,  C22C38/24 ,  C22C38/22 ,  C22C38/04 ,  C22C38/06 ,  C22C38/02 ,  C22C38/00 ,  C21D9/40 ,  C21D6/00 ,  C21D1/32 ,  C21D1/06 ,  C23C8/22 ,  F16C33/62

摘要： The steel material for a carburized bearing part according to the present invention contains, by mass %, C: 0.25 to 0.45%, Si: 0.15 to 0.45%, Mn: 0.40 to 1.50%, P: 0.015% or less, S: 0.005% or less, Cr: 0.60 to 2.00%, Mo: 0.10 to 0.35%, V: 0.20 to 0.40%, Al: 0.005 to 0.100%, Ca: 0.0002 to 0.0010%, N: 0.0300% or less and O: 0.0015% or less, with the balance being Fe and impurities, and satisfies Formulae (1) to (3). 1.20 0.50  (2) 2.7C+0.4Si+Mn+0.45Ni+0.8Cr+Mo+V>2.55  (3) Formula (2) shows an area fraction of sulfides containing Ca in an amount of 1 mol % or more among sulfides having an equivalent circular diameter of 1 μm or more.