公开(公告)号：US20240327962A1

公开(公告)日：2024-10-03

申请号：US18711903

申请日：2022-11-29

申请人： NIPPON STEEL CORPORATION

发明人： Takafumi YOKOYAMA ,  Chisato YOSHINAGA ,  Takuya KUWAYAMA ,  Kengo TAKEDA ,  Takuya MITSUNOBU ,  Seiji FURUSAKO ,  Tatsuya OBUCHI

IPC分类号： C22C38/04 ,  C21D6/00 ,  C21D8/02 ,  C22C38/02 ,  C22C38/06 ,  C23C2/06 ,  C23C2/20 ,  C23C2/28 ,  C23C2/40

CPC分类号： C22C38/04 ,  C21D6/005 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0273 ,  C22C38/02 ,  C22C38/06 ,  C23C2/06 ,  C23C2/20 ,  C23C2/28 ,  C23C2/40 ,  C21D2211/001 ,  C21D2211/002 ,  C21D2211/003 ,  C21D2211/005 ,  C21D2211/008 ,  C21D2211/009

摘要： Provided are a hot dip galvanized steel sheet having a predetermined chemical composition, and a steel microstructure comprising, by vol %, ferrite: 0 to 50%, tempered martensite: 1% or more, retained austenite: 5% or more, fresh martensite: 0 to 15%, total of pearlite and cementite: 0 to 5%, and balance: bainite, when measuring by GDS, a maximum value of Al concentration of an Al rich layer present at an interface of the base steel sheet and the hot dip galvanized layer is 2.0 mass % or more and an Sis/Sib right under the interface is 0.90 or less, a number density of recessed parts with a depth of more than 2 μm at the interface is 2.0/100 μm or less per interface length, and a tensile strength is 980 MPa or more, and a method for producing the same.

公开(公告)号：US20240182997A1

公开(公告)日：2024-06-06

申请号：US18410064

申请日：2024-01-11

申请人： NIPPON STEEL CORPORATION

发明人： Takafumi YOKOYAMA ,  Hiroyuki KAWATA ,  Kunio HAYASHI ,  Yuji YAMAGUCHI ,  Satoshi UCHIDA

IPC分类号： C21D9/46 ,  B32B15/01 ,  C21D8/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/18 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/52 ,  C22C38/54 ,  C22C38/60 ,  C23C2/02 ,  C23C2/06 ,  C23C2/28 ,  C23C2/40

CPC分类号： C21D9/46 ,  B32B15/013 ,  C21D8/0226 ,  C21D8/0263 ,  C22C38/001 ,  C22C38/002 ,  C22C38/005 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/18 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/52 ,  C22C38/54 ,  C22C38/60 ,  C23C2/02 ,  C23C2/0224 ,  C23C2/06 ,  C23C2/28 ,  C23C2/40 ,  C21D2211/001 ,  C21D2211/002 ,  C21D2211/003 ,  C21D2211/005 ,  C21D2211/008 ,  C21D2211/009

摘要： A hot dip galvanized steel sheet includes a base steel sheet and a hot dip galvanized layer on at least one surface of the base metal steel sheet, wherein the base steel sheet has a predetermined chemical composition, and contains, by volume fraction, ferrite: 0% to 50%, retained austenite: 0% to 30%, tempered martensite: 5% or more, fresh martensite: 0% to 10%, and pearlite and cementite in total: 0% to 5%, when there are remaining structures, the remaining structures consist of bainite, a concentration of B atoms at prior austenite grain boundaries is 2.0 atm % or more, and an average effective crystal grain size is 7.0 μm or less, and a method for producing the same.

公开(公告)号：US20240175112A1

公开(公告)日：2024-05-30

申请号：US18552755

申请日：2022-03-22

申请人： Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)

发明人： Yosuke MATSUMOTO ,  Kenshi IKEDA ,  Takuya KOCHI ,  Masayuki SAKATA ,  Tatsunori UCHIDA ,  Koji YAMASHITA ,  Yuta INOUE

IPC分类号： C22C38/18 ,  C21D1/32 ,  C21D8/06 ,  C21D9/52 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06

CPC分类号： C22C38/18 ,  C21D1/32 ,  C21D8/065 ,  C21D9/525 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C21D2211/003 ,  C21D2211/005

摘要： A steel wire for machine structural parts, including respective predetermined contents of C, Si, Mn, P, S, Al, Cr, N, and iron, wherein when a total content of Cr and Mn (% by mass) in cementite in the metallurgical microstructure is expressed as {Cr+Mn}, a total content of Cr and Mn (% by mass) in steel is expressed as [Cr+Mn], and a C content (% by mass) of the steel is expressed as [C], a concentration ratio {Cr+Mn}/[Cr+Mn] is (0.5[C] +0.040) or more, and an average circular-equivalent diameter of all the cementite is (1.668-2.13[C]) μm or more and (1.863-2.13[C]) μm or less.

公开(公告)号：US11920208B2

公开(公告)日：2024-03-05

申请号：US16954510

申请日：2018-12-18

申请人： ArcelorMittal

发明人： Coralie Jung ,  Astrid Perlade ,  Kangying Zhu ,  Frédéric Kegel

IPC分类号： C21D9/46 ,  B23K11/16 ,  B32B15/01 ,  C21D6/00 ,  C21D8/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/06 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/38 ,  C23C2/02 ,  C23C2/06 ,  C23C2/12 ,  C23C2/28 ,  C23C2/40 ,  B23K101/00

CPC分类号： C21D9/46 ,  B23K11/16 ,  B32B15/012 ,  B32B15/013 ,  C21D6/002 ,  C21D6/005 ,  C21D6/008 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0263 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/06 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/38 ,  C23C2/02 ,  C23C2/0224 ,  C23C2/06 ,  C23C2/12 ,  C23C2/29 ,  C23C2/40 ,  B23K2101/006 ,  C21D2211/001 ,  C21D2211/003 ,  C21D2211/005 ,  C21D2211/008

摘要： A cold-rolled and heat-treated steel sheet, has a composition comprising, by weight percent: n0.10%≤C≤0.25%, 3.5%≤Mn—≤6.0%, 0.5%≤Si≤2.0%, 0.3%≤Al≤1.2%, with Si+Al≥0.8%, 0.10%≤Mo≤0.50%, S≤0.010%, P≤0.020%, N≤0.008%. The cold-rolled steel sheet has a microstructure consisting of, in surface fraction: between 10% and 45% of ferrite, having an average grain size of at most 1.3 μm, the product of the surface fraction of ferrite by the average grain size of the ferrite being of at most 35 μm %, between 8% and 30% of retained austenite, the retained austenite having an Mn content higher than 1.1*Mn %, Mn % designating the Mn content of the steel, at most 8% of fresh martensite, at most 2.5% of cementite and partitioned martensite.

公开(公告)号：US20240035515A1

公开(公告)日：2024-02-01

申请号：US18025379

申请日：2021-09-16

申请人： NTN Corporation

发明人： Naoki FUJIMURA ,  Masahiro YAMADA ,  Chikara OHKI

IPC分类号： F16C33/62 ,  F16C19/06 ,  C21D9/40 ,  C21D1/18 ,  C21D1/74 ,  C23C8/32

CPC分类号： F16C33/62 ,  F16C19/06 ,  C21D9/40 ,  C21D1/18 ,  C21D1/74 ,  C23C8/32 ,  C21D2211/003 ,  C21D2211/008

摘要： A bearing part (10) is composed of a steel, and has a quench-hardened layer (11) in a surface of the bearing part. The quench-hardened layer includes a plurality of martensite crystal grains. The plurality of martensite crystal grains are classified into a first group and a second group. A minimum value of crystal grain sizes of the martensite crystal grains belonging to the first group is larger than a maximum value of crystal grain sizes of the martensite crystal grains belonging to the second group. A value obtained by dividing a total area of the martensite crystal grains belonging to the first group by the total area of the plurality of martensite crystal grains is more than or equal to 0.3. A value obtained by dividing, by the total area of the plurality of martensite crystal grains, a total area of the martensite crystal grains belonging to the first group except for a martensite crystal grain that has a minimum crystal grain size and that belongs to the first group is less than 0.3. An average grain size of the martensite crystal grains belonging to the first group is less than or equal to 1.5 μm. The quench-hardened layer (11) further includes a plurality of cementite grains. A number density of cementite grains each having a grain size of more than or equal to 1 μm is more than or equal to 0.025/μm2.

公开(公告)号：US20240011115A1

公开(公告)日：2024-01-11

申请号：US18035157

申请日：2021-11-04

申请人： POSCO Co., Ltd

发明人： Jai-Ik Kim

IPC分类号： C21D9/46 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C21D8/02 ,  C21D6/00 ,  C21D1/74

CPC分类号： C21D9/46 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/002 ,  C22C38/001 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0263 ,  C21D6/005 ,  C21D6/008 ,  C21D1/74 ,  C21D2211/003

摘要： An exemplary embodiment of the present invention provides an enamel steel sheet, including: by wt % (% by weight), 0.01 to 0.05% of C, 0.05 to 0.8% of Mn, 0.001 to 0.03% of Si, 0.03 to 0.12% of Al, 0.001 to 0.02% of P, 0.001 to 0.02% of S, 0.004% or less (excluding 0%) of N, 0.001 to 0.003% of B, 0.003% or less (excluding 0%) of O, and the balance of Fe and inevitable impurities. The enamel steel sheet according to an exemplary embodiment of the present invention includes an oxide layer in an inside direction from a surface, and a thickness of the oxide layer is 0.006 to 0.030 μm.

公开(公告)号：US11866801B2

公开(公告)日：2024-01-09

申请号：US17477073

申请日：2021-09-16

申请人： PanGang Group Panzhihua Iron & Steel Research Institute Co., Ltd.

发明人： Xin Lu ,  Dadong Li ,  Wei Bai ,  Feixiang Xu

IPC分类号： C21D9/50 ,  C21D8/00 ,  C21D9/04

CPC分类号： C21D9/505 ,  C21D8/005 ,  C21D9/04 ,  C21D2211/003 ,  C21D2211/009

摘要： The present disclosure relates to the technical field of rails welding, and particularly to a method for optimizing microstructure of a rail welded joint, the method comprises the following steps: step 1): subjecting a rail web area of a to-be-cooled welded joint which is obtained by flash butt welding to an accelerated cooling by means of an accelerated cooling device and by using compressed air as a cooling medium, measuring and monitoring temperature of a central position of the rail web of the welded joint while cooling; step 2): stopping the accelerated cooling when the temperature of the central position of the rail web drops to a preset temperature, then placing the welded joint in air and naturally cooling to room temperature, wherein the rail is a pearlite rail having a carbon content of 0.6-0.9 wt %.

公开(公告)号：US20190169707A1

公开(公告)日：2019-06-06

申请号：US16267973

申请日：2019-02-05

申请人： NIPPON STEEL & SUMITOMO METAL CORPORATION

发明人： Koutarou HAYASHI ,  Toshinobu NISHIBATA

IPC分类号： C21D9/46 ,  C22C38/18 ,  C21D7/13 ,  C22C38/14 ,  C22C38/12 ,  C22C38/08 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C22C38/16 ,  C21D8/02 ,  C21D1/673 ,  C22C38/38

CPC分类号： C21D9/46 ,  C21D1/18 ,  C21D1/673 ,  C21D7/13 ,  C21D8/0221 ,  C21D8/0247 ,  C21D2211/001 ,  C21D2211/003 ,  C21D2211/005 ,  C21D2211/008 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/005 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/18 ,  C22C38/38

摘要： A steel sheet for hot pressing includes: a specific chemical composition; and a steel structure comprising ferrite and cementite and represented, in area %: a total area ratio of bainite and martensite: 0% to 10%; and an area ratio of cementite: 1% or more; and a concentration of Mn in the cementite is 5% or more.

公开(公告)号：US10077490B2

公开(公告)日：2018-09-18

申请号：US14399289

申请日：2013-05-07

申请人： VALLS BESITZ GMBH

发明人： Isaac Valls

IPC分类号： C22C38/12 ,  C22C38/22 ,  C22C38/44 ,  C22C38/58 ,  C21D9/00 ,  C22C38/18 ,  C21D6/00 ,  C21D1/30 ,  C22C38/02 ,  C22C38/04 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/30 ,  C22C38/32 ,  C22C38/38 ,  C22C38/50 ,  C22C38/52 ,  C22C38/00 ,  C22C38/08 ,  C22C38/14

CPC分类号： C22C38/58 ,  C21D1/30 ,  C21D6/002 ,  C21D9/00 ,  C21D2211/001 ,  C21D2211/002 ,  C21D2211/003 ,  C21D2211/008 ,  C22C38/002 ,  C22C38/005 ,  C22C38/02 ,  C22C38/04 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/18 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/30 ,  C22C38/32 ,  C22C38/38 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/52 ,  C22C38/54

摘要： The present invention relates to the application of at least partially bainitic or interstitial martensitic heat treatments on steels, often tool steels or steels that can be used for tools. The first tranche of the heat treatment implying austenitization is applied so that the steel presents a low enough hardness to allow for advantageous shape modification, often trough machining. Thus a steel product is obtained which can be shaped with ease and whose hardness can be raised to a higher working hardness with a simple heat treatment at low temperature (below austenitization temperature).

公开(公告)号：US20180245175A1

公开(公告)日：2018-08-30

申请号：US15754635

申请日：2016-07-25

申请人： BAOSHAN IRON & STEEL CO., LTD.

发明人： Jun LI ,  Dechao XU ,  Xin LIU ,  Zhilong DING ,  Yuling REN ,  Xuewei YE ,  Hengfa HU ,  Hongming CHEN

IPC分类号： C21D9/46 ,  B32B15/08 ,  B32B15/04 ,  B32B15/18 ,  B32B15/20 ,  C21D8/02 ,  C21D6/00 ,  C23C2/12 ,  C23C2/28 ,  C23C2/40 ,  C23F17/00 ,  C23C2/06 ,  C22C38/14 ,  C22C38/12 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C22C21/10 ,  C22C18/04 ,  C22C30/06

CPC分类号： C21D9/46 ,  B32B15/012 ,  B32B15/013 ,  B32B15/043 ,  B32B15/08 ,  B32B15/18 ,  B32B15/20 ,  C21D1/52 ,  C21D6/005 ,  C21D6/008 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0263 ,  C21D8/0273 ,  C21D8/0278 ,  C21D8/0473 ,  C21D9/48 ,  C21D2211/002 ,  C21D2211/003 ,  C21D2211/004 ,  C21D2211/005 ,  C21D2211/008 ,  C22C18/04 ,  C22C21/10 ,  C22C30/06 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/12 ,  C22C38/14 ,  C23C2/02 ,  C23C2/06 ,  C23C2/12 ,  C23C2/26 ,  C23C2/28 ,  C23C2/40 ,  C23F17/00

摘要： An aluminium-zinc-hot-dipped and colour-coated steel plate having a 500 MPa yield strength grade and a high elongation and a manufacturing method thereof, with the chemical components in mass percentage of a substrate of the steel plate being: 0.07-0.15% of C, 0.02-0.5% of Si, 1.3-1.8% of Mn, N≤0.004%, S≤0.01%, Ti≤0.15%, Nb≤0.050%, and the balance being Fe and other inevitable impurities, and meanwhile satisfying the conditions of: (C+Mn/6)≥0.3%; Mn/S≥150; Nb satisfying 0.01%≤(Nb-0.22C-1.1N)≤0.05% where no Ti is contained; Ti satisfying 0.5≤Ti/C≤1.5 where no Nb is contained; and 0.04%≤(Ti+Nb)≤0.2% where Ti and Nb are added in combination. The steel plate has a yield strength of ≥500 MPa, a tensile strength of ≥550 MPa, an elongation after fracture of ≥15%, a good strength and toughness and an excellent corrosion resistance.