公开(公告)号：US12163202B2

公开(公告)日：2024-12-10

申请号：US17437357

申请日：2020-02-13

Applicant: JFE STEEL CORPORATION

Inventor： Yoshie Obata ,  Katsutoshi Takashima ,  Minoru Tanaka ,  Yoshiko Nakahara

IPC: C21D9/46 ,  B21C47/02 ,  B21D22/02 ,  C21D8/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/14 ,  C22C38/60 ,  C23C2/02 ,  C23C2/06 ,  C23C2/12 ,  C23C2/28 ,  C23C2/40 ,  C23G1/00

Abstract: A hot press member includes excellent indentation peel strength which has a tensile strength of 1780 MPa or more. A plating layer has at a surface thereof a 10-point average roughness Rzjis of 25 μm or less, and a steel sheet contains, in mass %, not less than 0.25% but less than 0.50% of C, 1.5% or less of Si, 1.1-2.4% of Mn, 0.05% or less of P, 0.005% or less of S, 0.01-0.50% of Al, 0.010% or less of N, 0.001-0.020% of Sb, 0.005-0.15% of Nb, and 0.005-0.15% of Ti, the balance being Fe and incidental impurities. The average crystal grain size of prior austenite is 7 μm or less and the volume proportion of martensite is 90% or more, within 50 μm in the thickness direction from the surface of the steel sheet excluding the plating layer.

公开(公告)号：US12037665B2

公开(公告)日：2024-07-16

申请号：US17414111

申请日：2019-12-19

Applicant: JFE Steel Corporation

Inventor： Minoru Tanaka ,  Koichi Taniguchi ,  Rinta Sato ,  Katsutoshi Takashima ,  Hiroshi Matsuda ,  Rinsei Ikeda

IPC: C22C38/02 ,  B23K11/00 ,  B23K11/11 ,  B23K11/16 ,  B23K101/18 ,  B23K101/34 ,  B23K103/04 ,  C22C18/04 ,  C22C38/04 ,  C23C2/06 ,  C23C2/28 ,  C23C2/40

CPC classification number: C22C38/02 ,  B23K11/0026 ,  B23K11/115 ,  B23K11/166 ,  C22C18/04 ,  C22C38/04 ,  C23C2/06 ,  C23C2/28 ,  C23C2/40 ,  B23K2101/18 ,  B23K2101/34 ,  B23K2103/04

Abstract: A spot welded member includes a spot weld formed by holding a sheet stack of multiple steel sheets between a pair of electrodes and spot-welding the sheet stack, in which at least one of the multiple steel sheets is a high-strength zinc-based coated steel sheet having a tensile strength of 780 MPa or more, the high-strength zinc-based coated steel sheet having a coating with an Al content of 0.5% or more by mass, and in which the heat shock region of the spot weld outwardly extending from an edge of a corona bond area includes a coated layer including an FeAl alloy layer having an average thickness of 0.3 μm or more and a zinc-based coated layer having an average thickness of 2.0 μm or more on the FeAl alloy layer at the interface between the base steel sheet of the high-strength zinc-based coated steel sheet and the coating.

公开(公告)号：US20160230259A1

公开(公告)日：2016-08-11

申请号：US15021518

申请日：2014-09-11

Applicant: JFE STEEL CORPORATION

Inventor： Minoru Tanaka ,  Yoshitsugu Suzuki ,  Yasunobu Nagataki

IPC: C22C38/34 ,  C23C2/36 ,  C23C2/06 ,  C22C38/50 ,  C22C38/48 ,  C22C38/44 ,  C22C38/42 ,  C22C38/32 ,  C22C38/28 ,  C22C38/26 ,  C22C38/22 ,  C22C38/20 ,  C22C38/14 ,  C22C38/12 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C21D9/46 ,  C21D8/02 ,  C21D6/00 ,  C21D1/52 ,  C23C2/02

CPC classification number: C22C38/34 ,  B32B15/013 ,  C21D1/52 ,  C21D1/74 ,  C21D1/76 ,  C21D6/004 ,  C21D6/005 ,  C21D6/008 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0247 ,  C21D8/0263 ,  C21D8/0278 ,  C21D9/46 ,  C21D9/56 ,  C21D9/561 ,  C21D2211/004 ,  C21D2211/005 ,  C22C18/00 ,  C22C18/04 ,  C22C38/00 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/20 ,  C22C38/22 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/38 ,  C22C38/42 ,  C22C38/44 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54 ,  C22C38/58 ,  C23C2/02 ,  C23C2/06 ,  C23C2/28 ,  C23C2/36 ,  C23C2/40

Abstract: A hot-dip galvanized steel sheet having a good appearance and good adhesion to a coating, the hot-dip galvanized steel sheet having a composition containing, on a mass basis: C: 0.08% or more and less than 0.20%, Si: 0.1% to 3.0%, Mn: 0.5% to 3.0%, P: 0.001% to 0.10%, Al: 0.01% to 3.00%, and S: 0.200% or less, a remainder being Fe and incidental impurities, wherein the hot-dip galvanized steel sheet includes an internal oxidation layer and a decarburized layer, the internal oxidation layer having a thickness of 5 μm or less, the decarburized layer having a thickness of 20 μm or less, and 50% or more by area of the internal oxidation layer is composed of a Si oxide containing Fe and/or Mn represented by Fe2XMn2-2XSiOY, wherein X ranges from 0 to 1, and Y is 3 or 4.

Abstract translation: 具有良好的外观和对涂层的良好粘附性的热浸镀锌钢板，该热浸镀锌钢板具有以下质量的组成：C：0.08％以上且小于0.20％的Si：0.1 ％至3.0％，Mn：0.5％至3.0％，P：0.001％至0.10％，Al：0.01％至3.00％，S：0.200％以下，余量为Fe和杂质，其中热浸 镀锌钢板包括内部氧化层和脱碳层，内部氧化层的厚度为5μm以下，脱碳层的厚度为20μm以下，内部氧化层的面积为50％以上 由含有Fe和/或Mn的由Fe2XMn2-2XSiOY表示的Si氧化物组成，其中X为0至1，Y为3或4。

公开(公告)号：US20240076757A1

公开(公告)日：2024-03-07

申请号：US18272628

申请日：2021-10-22

Applicant: JFE Steel Corporation

Inventor： Rinta Sato ,  Daisuke Mizuno ,  Minoru Tanaka ,  Ryoto Nishiike

IPC: C21D1/18 ,  C21D8/02 ,  C21D9/46 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/60 ,  C23C2/06 ,  C23C2/12 ,  C23C2/40 ,  C25D3/56

CPC classification number: C21D1/18 ,  C21D8/0236 ,  C21D9/46 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/60 ,  C23C2/06 ,  C23C2/12 ,  C23C2/40 ,  C25D3/565

Abstract: A hot-pressed member is disclosed including at least one surface that has a filtered centerline waviness Wca of less than or equal to 1.5 μm.

公开(公告)号：US11814695B2

公开(公告)日：2023-11-14

申请号：US15779157

申请日：2016-11-08

Applicant: JFE STEEL CORPORATION

Inventor： Mai Aoyama ,  Minoru Tanaka ,  Yoshitsugu Suzuki ,  Yoshiyasu Kawasaki ,  Hideyuki Takahashi

IPC: C21D9/46 ,  C23C2/02 ,  C23C2/06 ,  C22C38/14 ,  C22C38/60 ,  C21D6/00 ,  C21D8/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/16 ,  C22C38/28 ,  C21D8/04 ,  C21D9/48 ,  C21D1/76 ,  C21D1/18 ,  B32B15/01 ,  C22C38/38 ,  C23C2/40

CPC classification number: C21D9/46 ,  B32B15/013 ,  C21D1/185 ,  C21D1/76 ,  C21D6/004 ,  C21D6/005 ,  C21D6/008 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0263 ,  C21D8/0273 ,  C21D8/0278 ,  C21D8/0463 ,  C21D8/0473 ,  C21D9/48 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/005 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/28 ,  C22C38/38 ,  C22C38/60 ,  C23C2/02 ,  C23C2/06 ,  C23C2/40 ,  C21D2211/001 ,  C21D2211/005

Abstract: A high-strength galvanized steel sheet and a method for producing the steel sheet. The steel sheet has a composition that includes C: 0.030% to 0.250%, Si: 0.01% to 3.00%, Mn: 2.00% to 10.00%, P: 0.001% to 0.100%, S: 0.0001% to 0.0200%, N: 0.0005% to 0.0100%, Ti: 0.005% to 0.200%, on a mass basis, and Fe and inevitable impurities. Additionally, the steel sheet has concentration of solute Mn at a depth of 5 μm or less from a surface of the steel sheet that is 1.50% by mass or less, and a value obtained by dividing the average mass percentage of Mn in retained austenite by the average mass percentage of Mn in ferrite is 2.0 or more.

公开(公告)号：US20150315692A1

公开(公告)日：2015-11-05

申请号：US14649760

申请日：2013-11-29

Applicant: JFE STEEL CORPORATION

Inventor： Minoru Tanaka ,  Yoshitsugu Suzuki ,  Mai Miyata ,  Yasunobu Nagataki

IPC: C23C2/02 ,  C23C2/40 ,  C21D9/46 ,  C21D6/00 ,  C22C38/60 ,  C22C38/58 ,  C22C38/54 ,  C22C38/50 ,  C22C38/48 ,  C22C38/44 ,  C22C38/42 ,  C22C38/38 ,  C22C38/34 ,  C22C38/32 ,  C22C38/28 ,  C22C38/26 ,  C22C38/22 ,  C22C38/20 ,  C22C38/16 ,  C22C38/14 ,  C22C38/12 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C23C2/06

CPC classification number: C21D9/46 ,  C21D1/74 ,  C21D6/004 ,  C21D6/005 ,  C21D6/008 ,  C21D9/561 ,  C22C18/04 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/20 ,  C22C38/22 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/34 ,  C22C38/38 ,  C22C38/42 ,  C22C38/44 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54 ,  C22C38/58 ,  C22C38/60 ,  C23C2/02 ,  C23C2/06 ,  C23C2/28 ,  C23C2/40

Abstract: A method for manufacturing a galvanized steel sheet includes heating a base steel sheet in a heating zone such that the surface of the base steel sheet is heated at a temperature of 600° C. or higher and 790° C. or lower while a furnace temperature T° C. in the heating zone of an annealing furnace is controlled based on the water vapor partial pressure PH2Oin Air of air fed into the heating zone, the base steel sheet having a chemical composition consisting of, by mass %, C: 0.05% or more and 0.25% or less, Si: 0.1% or more and 3.0% or less, Mn: 0.5% or more and 3.0% or less, P: 0.001% or more and 0.10% or less, Al: 0.01% or more and 3.00% or less, S: 0.200% or less, and the balance being Fe and inevitable impurities, heating the base steel sheet in the heating zone such that the surface of the base steel sheet is heated at a temperature of 630° C. or higher and 850° C. or lower in an atmosphere containing hydrogen gas having a partial pressure PH2 of 1000 Pa or more and 50000 Pa or less, water vapor gas having a partial pressure PH2O of 610 Pa or less, and the balance being N2 and inevitable impurities, and galvanizing the base steel sheet.

Abstract translation: 镀锌钢板的制造方法包括：在加热区域中加热基材钢板，使基材钢板的表面在600℃以上且790℃以下的温度下加热，同时炉温 基于进入加热区域的空气的水蒸气分压PH2Oin控制退火炉的加热区域中的T℃，基质钢板以质量％计含有C：0.05％ 以上，0.25％以下，Si：0.1％以上且3.0％以下，Mn：0.5％以上且3.0％以下，P：0.001％以上且0.10％以下，Al：0.01％以上 和3.00％以下，S：0.200％以下，余量为Fe和不可避免的杂质，在加热区域中加热基材钢板，使基材钢板的表面在630℃的温度下加热。 在含有分压PH2为1000Pa以上且50000Pa的氢气的气氛中，为850℃以下 以下，分压PH2O为610Pa以下的水蒸汽气体，余量为N2和不可避免的杂质，镀锌基板。