公开(公告)号：US11035017B2

公开(公告)日：2021-06-15

申请号：US16092272

申请日：2016-04-19

Applicant: JFE STEEL CORPORATION

Inventor： Yusuke Terazawa ,  Naoki Takayama ,  Kenji Hayashi ,  Kazukuni Hase

IPC: C21D8/02 ,  C21D6/00 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/20 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/38 ,  C22C38/42 ,  C22C38/46 ,  C22C38/58 ,  C22C38/06 ,  C22C38/18 ,  C22C38/40 ,  B22D11/12 ,  B22C11/12

Abstract: An abrasion-resistant steel plate that can achieve both gas cutting cracking resistance and abrasion resistance at low cost is provided. An abrasion-resistant steel plate comprises: a chemical composition containing, in mass %, C: more than 0.34% and 0.50% or less, Si: 0.01% to 1.0%, Mn: 0.30% to 2.00%, P: 0.015% or less, S: 0.005% or less, Cr: 0.01% to 2.00%, Al: 0.001% to 0.100%, N: 0.01% or less, and a balance consisting of Fe and inevitable impurities; and a microstructure in which a volume fraction of martensite at a depth of 1 mm from a surface of the abrasion-resistant steel plate is 90% or more, and a prior austenite grain size at the mid-thickness of the abrasion-resistant steel plate is 80 μm or less, wherein hardness at a depth of 1 mm from the surface of the abrasion-resistant steel plate is 560 HBW 10/3000 or more in Brinell hardness, and a concentration [Mn] of Mn in mass % and a concentration [P] of P in mass % in a plate thickness central segregation area satisfy 0.04[Mn]+[P]

公开(公告)号：US11118240B2

公开(公告)日：2021-09-14

申请号：US16092538

申请日：2016-04-19

Applicant: JFE STEEL CORPORATION

Inventor： Yusuke Terazawa ,  Naoki Takayama ,  Kenji Hayashi ,  Kazukuni Hase

IPC: C21D8/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/20 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/50 ,  C22C38/54 ,  C22C38/18 ,  C22C38/40 ,  B22D11/12 ,  C22C38/38 ,  C22C38/32 ,  C22C38/28 ,  B22D11/00 ,  C21D9/46

Abstract: An abrasion-resistant steel plate comprises: a chemical composition containing, in mass %, C: 0.20% to 0.45%, Si: 0.01% to 1.0%, Mn: 0.3% to 2.5%, P: 0.020% or less, S: 0.01% or less, Cr: 0.01% to 2.0%, Ti: 0.10% to 1.00%, B: 0.0001% to 0.0100%, Al: 0.1% or less, N: 0.01% or less, and a balance consisting of Fe and inevitable impurities; and a microstructure in which a volume fraction of martensite is 90% or more, and a prior austenite grain size is 80 μm or less, wherein a number density of TiC precipitate having a size of 0.5 μm or more is 400 particles/mm2 or more, and a Mn content [Mn] and a P content [P] in a plate thickness central segregation area satisfy 0.04[Mn]+[P]

公开(公告)号：US20150232971A1

公开(公告)日：2015-08-20

申请号：US14429557

申请日：2013-09-13

Applicant: JFE STEEL CORPORATION

Inventor： Shinichi Miura ,  Keiji Ueda ,  Nobuyuki Ishikawa ,  Naoki Takayama

IPC: C22C38/60 ,  C21D1/18 ,  C21D6/00 ,  C22C38/54 ,  C22C38/50 ,  C22C38/48 ,  C22C38/46 ,  C22C38/44 ,  C22C38/42 ,  C22C38/38 ,  C22C38/32 ,  C22C38/28 ,  C22C38/26 ,  C22C38/24 ,  C22C38/22 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C21D9/46

Abstract: An abrasion resistant steel plate which possesses excellent abrasion resistance, excellent low-temperature toughness and excellent corrosive wear resistance. The abrasion resistant steel plate includes the composition containing by mass %: 0.23% to 0.35% C, 0.05% to 1.00% Si, 0.1% to 2.0% Mn, 0.020% or less P, 0.005% or less S, 0.005% to 0.100% Al, 0.03% to 2.0% Cr, and 0.03% to 1.0% Mo in a state where DI* defined by the following formula (1) is satisfied 45 or more, and further containing remaining Fe and unavoidable impurities as a balance. The steel plate has a structure where an as-quenched martensitic phase forms a main phase and a grain size of prior austenite grains is 30 μm or less, and surface hardness of the steel plate is 450 or more at Brinel hardness HBW10/3000.

Abstract translation: 具有优异的耐磨性，优异的低温韧性和优异的耐腐蚀性的耐磨钢板。 耐磨钢板包含以质量％计含有：C：0.23〜0.35％，Si：0.05〜1.00％，Mn：0.1〜2.0％，P：0.020％以下，S：0.005％〜0.100 在满足下式（1）所示的DI *为45以上的状态下，还含有剩余的Fe和不可避免的杂质作为平衡值的情况下，Al为0.03％〜2.0％的Cr，0.03〜1.0％的Mo。 该钢板具有淬火后的马氏体相形成主相的结构，而前奥氏体晶粒的晶粒尺寸为30μm以下，并且钢板的表面硬度在布氏硬度HBW10 / 3000时为450以上。

公开(公告)号：US11035018B2

公开(公告)日：2021-06-15

申请号：US16092530

申请日：2016-04-19

Applicant: JFE STEEL CORPORATION

Inventor： Yusuke Terazawa ,  Naoki Takayama ,  Kenji Hayashi ,  Kazukuni Hase

IPC: C21D8/02 ,  C22C38/38 ,  C22C38/58 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/20 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  B22D11/12 ,  C22C38/18 ,  C22C38/40 ,  B22D11/00

Abstract: An abrasion-resistant steel plate comprises: a specific chemical composition; and a microstructure in which a volume fraction of martensite at a depth of 1 mm from a surface of the abrasion-resistant steel plate is 90% or more, and a prior austenite grain size at the mid-thickness of the abrasion-resistant steel plate is 80 μm or less, wherein hardness at a depth of 1 mm from the surface of the abrasion-resistant steel plate is 360 to 490 HBW 10/3000 in Brinell hardness, and a concentration [Mn] of Mn in mass % and a concentration [P] of P in mass % in a plate thickness central segregation area satisfy 0.04[Mn]+[P]

公开(公告)号：US11926881B2

公开(公告)日：2024-03-12

申请号：US17636714

申请日：2020-06-19

Applicant: JFE STEEL CORPORATION

Inventor： Yuji Tanaka ,  Hidekazu Minami ,  Naoki Takayama ,  Takako Yamashita

IPC: C21D9/46 ,  B32B15/01 ,  C21D6/00 ,  C21D8/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/06 ,  C22C38/08 ,  C22C38/10 ,  C22C38/12 ,  C22C38/16 ,  C22C38/28 ,  C22C38/32 ,  C22C38/38 ,  C23C2/28 ,  C23C2/40

CPC classification number: C21D9/46 ,  B32B15/013 ,  C21D6/001 ,  C21D6/002 ,  C21D6/005 ,  C21D6/007 ,  C21D6/008 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C22C38/001 ,  C22C38/002 ,  C22C38/005 ,  C22C38/02 ,  C22C38/06 ,  C22C38/08 ,  C22C38/10 ,  C22C38/12 ,  C22C38/16 ,  C22C38/28 ,  C22C38/32 ,  C22C38/38 ,  C23C2/29 ,  C23C2/40 ,  C21D2211/002 ,  C21D2211/008 ,  Y10T428/12799

Abstract: A high-strength cold-rolled steel sheet having a high yield ratio and excellent stretch flangeability and a method for manufacturing the steel sheet. The high-strength cold-rolled steel sheet has a chemical composition including, by mass %, C: 0.10 to 0.30%, Si: 0.50 to 2.00%, Mn: 2.5 to 4.0%, P: 0.050% or less, S: 0.020% or less, Al: 0.10% or less, N: 0.01% or less, Ti: 0.100% or less, and B: 0.0003 to 0.0030%, with the balance being Fe and incidental impurities. N and Ti satisfy a specified formula, and the total area fraction of martensite and bainite is 95% or more. The number density of bainite grains having an area of 3 μm2 or more and a carbon concentration of less than 0.7C is 1200 grains/mm2 or less.

公开(公告)号：US12180572B2

公开(公告)日：2024-12-31

申请号：US17753552

申请日：2020-08-17

Applicant: JFE STEEL CORPORATION

Inventor： Naoki Takayama ,  Shigeki Kitsuya ,  Yoshiaki Murakami

IPC: C22C38/38 ,  C21D8/04 ,  C22C38/02

Abstract: The steel plate has a specific chemical composition, and a microstructure where a volume fraction of martensite at a depth of 1 mm from a surface of the steel plate is 95% or more, and at a depth of 1 mm from a surface of the steel plate, a Vickers hardness at 400° C. is 288 or more, and a Brinell hardness at 25° C. is 360 HBW10/3000 to 490 HBW10/3000.

公开(公告)号：US11111556B2

公开(公告)日：2021-09-07

申请号：US16092553

申请日：2016-04-19

Applicant: JFE STEEL CORPORATION

Inventor： Yusuke Terazawa ,  Naoki Takayama ,  Kenji Hayashi ,  Kazukuni Hase

IPC: C21D8/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/20 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/50 ,  C22C38/54 ,  C22C38/18 ,  C22C38/40 ,  B22D11/12 ,  C22C38/38 ,  C22C38/32 ,  C22C38/28 ,  B22D11/00 ,  C21D9/46 ,  C22C38/58 ,  B22D11/041 ,  C21D6/00 ,  C22C38/44

Abstract: An abrasion-resistant steel plate comprises: a specific chemical composition; and a microstructure in which a volume fraction of martensite at a depth of 1 mm from a surface of the abrasion-resistant steel plate is 90% or more, and a prior austenite grain size in a plate thickness central part at the mid-thickness of the abrasion-resistant steel plate is 80 μm or less, wherein hardness at a depth of 1 mm from the surface of the abrasion-resistant steel plate is 460 to 590 HBW 10/3000 in Brinell hardness, and a concentration [Mn] of Mn in mass % and a concentration [P] of P in mass % in a plate thickness central segregation area satisfy 0.04[Mn]+[P]

公开(公告)号：US11060172B2

公开(公告)日：2021-07-13

申请号：US16488701

申请日：2018-02-02

Applicant: JFE STEEL CORPORATION

Inventor： Naoki Takayama ,  Yusuke Terazawa ,  Yoshiaki Murakami ,  Kazukuni Hase ,  Yusaku Takemura ,  Yasuhiro Murota

IPC: C22C38/00 ,  C22C38/02 ,  C22C38/54 ,  C21D8/02 ,  C21D9/46 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/50 ,  C22C38/52

Abstract: Provided is an abrasion-resistant steel plate which has high hardness up to the mid-thickness part thereof although the steel plate is 50 mm or more, and can be manufactured at low cost. The abrasion-resistant steel plate has a specific chemical composition having DI* of 120 or more, where DI* is defined by the following Formula (1): DI*=33.85×(0.1×C)0.5×(0.7×Si+1)×(3.33×Mn+1)×(0.35×Cu+1)×(0.36×Ni+1)×(2.16×Cr+1)×(3×Mo+1)×(1.75×V+1)×(1.5×W+1) . . . (1), has HB1 of 360 HBW10/3000 to 490 HBW10/3000, HB1 being a Brinell hardness at a depth of 1 mm from a surface, has a hardness ratio, HB1/2 to HB1, of 75% or more, HB1/2 being a Brinell hardness at a mid-thickness position, and has a plate thickness of 50 mm or more.