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：US10036079B2

公开(公告)日：2018-07-31

申请号：US14774351

申请日：2014-03-05

Applicant: JFE STEEL CORPORATION

Inventor： Yusuke Terazawa ,  Katsuyuki Ichimiya ,  Kazukuni Hase ,  Shigeru Endo

IPC: C22C38/00 ,  C21D9/46 ,  C21D8/02 ,  C22C38/14 ,  C22C38/58 ,  B23K35/30 ,  C22C38/04 ,  C22C38/08 ,  C21D1/84 ,  C21D6/00 ,  C22C38/02 ,  C22C38/06 ,  C22C38/12 ,  C22C38/16 ,  C22C38/50

CPC classification number: C21D9/46 ,  B23K35/3073 ,  C21D1/84 ,  C21D6/004 ,  C21D6/005 ,  C21D6/008 ,  C21D8/02 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0247 ,  C21D8/0263 ,  C21D2211/004 ,  C22C38/001 ,  C22C38/002 ,  C22C38/005 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/50 ,  C22C38/58

Abstract: There is provided a thick steel plate having good multipass weld joint CTOD characteristics for low to medium heat input and a method for manufacturing the thick steel plate. A steel plate containing, on a mass percent basis, C: 0.03% to 0.12%, Si: 0.5% or less, Mn: 1.0% to 2.0%, P: 0.015% or less, S: 0.0005% to 0.0050%, Al: 0.005% to 0.060%, Ni: 0.5% to 2.0%, Ti: 0.005% to 0.030%, N: 0.0015% to 0.0065%, O: 0.0010% to 0.0050%, Ca: 0.0005% to 0.0060%, and optionally one or two or more of Cu and the like, wherein Ti/N, Ceq, Pcm, and ACR are in particular ranges, a base material of the plate has an effective grain size of 20 μm or less at half the thickness of the plate, and the plate contains a particular number of complex inclusions at ¼ and ½ of the thickness of the plate, the complex inclusions being composed of a sulfide containing Ca and Mn and an oxide containing Al and having an equivalent circular diameter of 0.1 μm or more. Steel having the composition described above is heated at a particular temperature, is then hot-rolled, and is cooled.

公开(公告)号：US20170044639A1

公开(公告)日：2017-02-16

申请号：US15304702

申请日：2015-04-24

Applicant: JFE Steel Corporation

Inventor： Shigeki Kitsuya ,  Katsuyuki Ichimiya ,  Kazukuni Hase ,  Shigeru Endo

IPC: C21D9/46 ,  C22C38/58 ,  C22C38/54 ,  C22C38/50 ,  C22C38/48 ,  C22C38/46 ,  C22C38/44 ,  C22C38/42 ,  C22C38/16 ,  C22C38/14 ,  C22C38/08 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C21D8/02 ,  B21B1/22

CPC classification number: C21D9/46 ,  B21B1/22 ,  B21B1/26 ,  B21B3/00 ,  B21B2001/225 ,  C21D8/02 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0263 ,  C21D2211/002 ,  C21D2211/008 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/005 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/14 ,  C22C38/16 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54 ,  C22C38/58

Abstract: A steel plate has excellent strength and toughness in a mid-thickness part thereof, despite having a plate thickness of 100 mm or greater. The steel plate has a chemical composition containing specific amounts of C, Si, Mn, P, S, Cr, Ni, Al, N, B, and 0, with the balance being Fe and incidental impurities, and having an equivalent carbon content Cer of 0.65 or greater. The steel plate has a yield strength of 620 MPa or greater, a plate thickness of 100 mm or greater, and has a microstructure in which prior γ grain size in a mid-thickness part of the steel plate has a maximum value, expressed as an equivalent circle diameter, of 150 μm or less, and a total area ratio of martensite and bainite in the mid-thickness part is 80% or greater.

Abstract translation: 尽管板厚为100mm以上，钢板在其中厚部分具有优异的强度和韧性。 钢板具有含有特定量的C，Si，Mn，P，S，Cr，Ni，Al，N，B和0的化学成分，余量为Fe和附带杂质，具有等效碳含量Cer 为0.65以上。 钢板的屈服强度为620MPa以上，板厚为100mm以上，并且具有以下的微观结构，其中钢板的中间部分中的γ粒径之前为最大值，表示为 当量圆直径为150μm以下，中厚部的马氏体和贝氏体的总面积比为80％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：US20210140023A1

公开(公告)日：2021-05-13

申请号：US16074184

申请日：2017-01-30

Applicant: JFE Steel Corporation

Inventor： Yuki Toji ,  Akio Ohmori ,  Koichi Nakashima ,  Ryo Arao ,  Katsuyuki Ichimiya ,  Kazukuni Hase

IPC: C22C38/54 ,  C22C38/00 ,  C22C38/04 ,  C22C38/46 ,  C22C38/42 ,  C22C38/48 ,  C22C38/50 ,  C22C38/06 ,  B23K35/30 ,  C22C38/44

Abstract: Provided is a steel material for high heat input welding having excellent welding heat affected zone low-temperature toughness at −55° C. in the case that the steel material is welded by high heat input welding with a heat input of more than 80 kJ/cm. The steel material may be used in low-temperature storage tanks, for example. The steel material for high heat input welding includes, in mass %, C: 0.04 to 0.09%, Si: 0.15 to 0.25%, Mn: 1.40 to 2.00%, P: 0.015% or less, S: 0.0005 to 0.0040%, Al: 0.030 to 0.080%, Ti: 0.005 to 0.025%, B: 0.0003 to 0.0020%, Ca: 0.0005 to 0.0030%, N: 0.0030 to 0.0060%, O: 0.0040% or less, Nb: 0.005% or less, and Mo: 0.005% or less, the balance being Fe and incidental impurities.

公开(公告)号：US10351926B2

公开(公告)日：2019-07-16

申请号：US15525672

申请日：2015-11-17

Applicant: JFE STEEL CORPORATION

Inventor： Yota Kuronuma ,  Hirofumi Ohtsubo ,  Shigeki Kitsuya ,  Katsuyuki Ichimiya ,  Kazukuni Hase

IPC: C21D9/46 ,  B21J1/02 ,  C22C38/00 ,  C22C38/58 ,  C21D6/00 ,  C21D7/13 ,  C21D8/00 ,  C21D8/02 ,  C21D9/00 ,  C21D1/18 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/20 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54 ,  B21J5/02

Abstract: A thick steel plate is provided by heating a continuously-cast slab, hot forging the continuously-cast slab using opposing dies having respective short sides differing such that when a short side length of a die having a shorter one of the short sides is taken to be 1, a short side length of a die having a longer one of the short sides is 1.1 to 3.0, allowing cooling to obtain a steel raw material, reheating the steel raw material, performing hot rolling of the steel raw material including at least two passes carried out, allowing cooling to obtain a thick steel plate, reheating the thick steel plate to at least the Ac3 temperature and no higher than 1050° C., rapidly cooling the thick steel plate to 350° C. or lower, and tempering the thick steel plate at at least 550° C. and no higher than 700° C.

公开(公告)号：US10300564B2

公开(公告)日：2019-05-28

申请号：US15129932

申请日：2015-03-31

Applicant: JFE STEEL CORPORATION

Inventor： Katsuyuki Ichimiya ,  Masao Yuga ,  Kazukuni Hase ,  Shigeru Endo

IPC: B23K35/30 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/14 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54 ,  C22C38/58 ,  C21D9/18 ,  C21D9/30 ,  C21D9/50 ,  F16B5/08 ,  B23K9/23 ,  B23K9/18 ,  B23K103/04

Abstract: A weld joint with an excellent CTOD property is produced with a weld metal, using a steel plate as a base metal. The steel plate has a chemical composition including C: 0.03% to 0.09%, Si: 0.01% to 0.35%, Mn: 1.3% to 2.0%, P: 0.012% or less, S: 0.0035% or less, Al: 0.01% to 0.06%, Ni: less than 0.3%, Mo: less than 0.10%, Nb: 0.005% to 0.023%, Ti: 0.005% to 0.025%, B: less than 0.0003%, N: 0.002% to 0.005%, Ca: 0.0005% to 0.0050%, and O: 0.0030% or less, with the components additionally satisfying a predetermined relationship. The weld metal has a chemical composition including C: 0.040% to 0.090%, Si: 0.1% to 0.8%, Mn: 1.0% to 2.5%, Al: 0.020% or less, Ni: 0.1% to 1.0%, Mo: 0.05% to 0.50%, Ti: 0.005% to 0.050%, and B: 0.0015% or less, the balance being Fe and incidental impurities.

公开(公告)号：US20190040488A1

公开(公告)日：2019-02-07

申请号：US16072717

申请日：2017-01-23

Applicant: JFE Steel Corporation

Inventor： Hideyuki Kimura ,  Ryo Nagao ,  Nobuyuki Ishikawa ,  Kazukuni Hase

IPC: C21D9/46 ,  C21D9/08 ,  C21D8/02 ,  C21D8/10 ,  C21D6/00 ,  C22C38/38 ,  C22C38/28 ,  C22C38/26 ,  C22C38/22 ,  C22C38/16 ,  C22C38/14 ,  C22C38/12 ,  C22C38/08 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00

Abstract: A steel plate for high-strength and high-toughness steel pipes has a chemical composition containing, by mass %, C: 0.03% or more and 0.08% or less, Si: more than 0.05% and 0.50% or less, Mn: 1.5% or more and 2.5% or less, P: 0.001% or more and 0.010% or less, S: 0.0030% or less, Al: 0.01% or more and 0.08% or less, Nb: 0.010% or more and 0.080% or less, Ti: 0.005% or more and 0.025% or less, and N: 0.001% or more and 0.006% or less, and further containing, by mass %, at least one selected from Cu: 0.01% or more and 1.00% or less, Ni: 0.01% or more and 1.00% or less, Cr: 0.01% or more and 1.00% or less, Mo: 0.01% or more and 1.00% or less, V: 0.01% or more and 0.10% or less, and B: 0.0005% or more and 0.0030% or less, with the balance being Fe and inevitable impurities. The steel plate has a microstructure in which an area fraction of ferrite at a ½ position of a thickness of the steel plate is 20% or more and 80% or less and deformed ferrite constitutes 50% or more and 100% or less of the ferrite.

公开(公告)号：US10000833B2

公开(公告)日：2018-06-19

申请号：US14770853

申请日：2014-03-11

Applicant: JFE Steel Corporation

Inventor： Shigeki Kitsuya ,  Naoki Matsunaga ,  Katsuyuki Ichimiya ,  Kazukuni Hase ,  Shigeru Endo

IPC: C22C38/50 ,  C22C38/58 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/54 ,  C21D1/78 ,  C21D6/00 ,  C21D8/02 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/20 ,  C22C38/22 ,  C22C38/24 ,  C22C38/28 ,  C22C38/32 ,  C22C38/38 ,  C21D1/25

CPC classification number: C22C38/58 ,  C21D1/25 ,  C21D1/78 ,  C21D6/004 ,  C21D6/005 ,  C21D6/008 ,  C21D8/0205 ,  C21D8/021 ,  C21D8/0226 ,  C21D8/0263 ,  C21D2211/001 ,  C21D2211/002 ,  C21D2211/004 ,  C21D2211/008 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/005 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/20 ,  C22C38/22 ,  C22C38/24 ,  C22C38/28 ,  C22C38/32 ,  C22C38/38 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/50 ,  C22C38/54

Abstract: A thick, high-toughness high-strength steel plate has excellent strength and toughness in the central area through the plate thickness. The thick steel plate has a specific chemical composition and includes a microstructure having, throughout an entire region in the plate thickness direction, an average prior austenite grain size of not more than 50 μm and a martensite and/or bainite phase area fraction of not less than 80%. A continuously cast slab having the specific chemical composition is heated to 1200° C. to 1350° C., hot worked with a strain rate of not more than 3/s and a cumulative working reduction of not less than 15%, and thereafter hot rolled and heat treated.

公开(公告)号：US20160040274A1

公开(公告)日：2016-02-11

申请号：US14774366

申请日：2014-03-05

Applicant: JFE STEEL CORPORATION

Inventor： Yusuke Terazawa ,  Katsuyuki Ichimiya ,  Kazukuni Hase ,  Shigeru Endo

IPC: C22C38/50 ,  C21D9/46 ,  C21D6/00 ,  C22C38/16 ,  C22C38/00 ,  C22C38/12 ,  C22C38/08 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C21D8/02 ,  C22C38/14

CPC classification number: C22C38/50 ,  C21D6/001 ,  C21D6/002 ,  C21D6/005 ,  C21D6/008 ,  C21D8/0226 ,  C21D8/0263 ,  C21D9/46 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/005 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/18

Abstract: Provided are a thick steel plate with which a welded joint having good CTOD property is formed by low-to-medium heat input multipass welding and a method for producing the thick steel plate.The steel plate has a composition containing, by mass, C: 0.03% to 0.10%, Si: 0.5% or less, Mn: 1.0% to 2.0%, P: 0.015% or less, S: 0.0005% to 0.0050%, Al: 0.005% to 0.060%, Ni: 0.5% to 2.0%, Ti: 0.005% to 0.030%, N: 0.0015% to 0.0065%, O: 0.0010% to 0.0050%, Ca: 0.0005% to 0.0060%, and, as needed, one or more elements such as Cu. Ti/N, Ceq, Pcm, and ACR each fall within the specific range. The effective crystal grain size of the base metal at the center of the plate in the thickness direction is 20 μm or less. A specific amount of a composite inclusion including a sulfide containing Ca and Mn and an oxide containing Al having an equivalent circular diameter of 0.1 μm or more is present at the ¼-thickness position and the ½-thickness position of the plate. The steel having the above-described composition is heated to a specific temperature, hot rolled, and cooled.

Abstract translation: 本发明提供一种厚钢板，通过低 - 中加热输入多次焊接形成具有良好CTOD性能的焊接接头，以及生产厚钢板的方法。 该钢板的组成为：含有C：0.03〜0.10％，Si：0.5％以下，Mn：1.0％〜2.0％，P：0.015％以下，S：0.0005〜0.0050％，Al ：0.005〜0.060％，Ni：0.5〜2.0％，Ti：0.005〜0.030％，N：0.0015％〜0.0065％，○：0.0010％〜0.0050％，Ca：0.0005〜0.0060％ 需要，一个或多个元素如Cu。 Ti / N，Ceq，Pcm和ACR分别落在特定范围内。 板厚中心处的母材的有效晶粒尺寸为20μm以下。 存在特定量的包含Ca和Mn的硫化物的复合夹杂物和含有等效圆直径为0.1μm以上的Al的氧化物存在于板的1/4厚度位置和1/2厚度位置。 将具有上述组成的钢加热到特定温度，热轧并冷却。