公开(公告)号：US10041160B2

公开(公告)日：2018-08-07

申请号：US15021048

申请日：2014-09-11

申请人： JFE STEEL CORPORATION ,  SUMIHATSU CO., LTD. ,  NHK SPRING CO., LTD.

发明人： Minoru Honjo ,  Kiyoshi Uwai ,  Shigeru Endo ,  Katsutoshi Yamashita ,  Koei Tsuru ,  Keiichi Fujie ,  Akira Tange

IPC分类号： C22C38/02 ,  C22C38/04 ,  C22C38/18 ,  C21D8/06 ,  C21D9/02 ,  F16F1/02 ,  C22C38/60 ,  C22C38/00 ,  C21D1/25 ,  C21D1/18 ,  C21D6/00 ,  C21D9/52 ,  C22C38/06 ,  C22C38/20 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/42

摘要： Provided is high strength steel for springs that, compared to conventional high strength steel for springs, has excellent decarburization resistance and scale exfoliation property, by optimization of the added amounts of C, Si, Mn, and Cr as well as of Sb and Sn. The steel for springs contains C: more than 0.45 mass % and less than 0.65 mass %, Si: 0.15 mass % or more and 0.70 mass % or less, Mn: 0.10 mass % or more and 1.00 mass % or less, Cr: 0.20 mass % or more and 1.50 mass % or less, P: 0.025 mass % or less, S: 0.025 mass % or less, O: 0.0015 mass % or less, Sb: 0.010 mass % or more and less than 0.030 mass %, and Sn: 0.010 mass % or more and 0.030 mass % or less, under predetermined conditions.

公开(公告)号：US10023946B2

公开(公告)日：2018-07-17

申请号：US14774366

申请日：2014-03-05

申请人： JFE STEEL CORPORATION

发明人： Yusuke Terazawa ,  Katsuyuki Ichimiya ,  Kazukuni Hase ,  Shigeru Endo

IPC分类号： C22C38/00 ,  C22C38/50 ,  C22C38/14 ,  C21D8/02 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/16 ,  C22C38/18 ,  C21D6/00 ,  C21D9/46

摘要： 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.

公开(公告)号：US20180073095A1

公开(公告)日：2018-03-15

申请号：US15560087

申请日：2016-03-25

申请人： JFE STEEL CORPORATION

发明人： Shusaku Ota ,  Junji Shimamura ,  Nobuyuki Ishikawa ,  Shigeru Endo

IPC分类号： C21D9/08 ,  C21D8/10 ,  C22C38/50 ,  C22C38/48 ,  C22C38/46 ,  C22C38/44 ,  C22C38/28 ,  C22C38/26 ,  C22C38/24 ,  C22C38/22 ,  C22C38/16 ,  C22C38/14 ,  C22C38/12 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C22C38/08 ,  F16L9/17

CPC分类号： C21D9/08 ,  C21D8/02 ,  C21D8/105 ,  C21D9/46 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/005 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/58 ,  F16L9/17

摘要： High-strength steel having a specified chemical composition wherein the ratio of Ti to N, Ti/N, is 2.0 to 4.0, and X (%), as calculated by equation (1): X=0.35Cr+0.9Mo+12.5Nb+8V (1) is 0.90% or more, wherein the symbols of chemical elements in equation (1) respectively denote the contents (mass %) of the corresponding chemical elements and wherein the symbol of a chemical element which is not included is assigned a value of 0, a microstructure having a bainite phase fraction of 70% or more, and a tensile strength of 760 MPa or more at a temperature of 350°C., methods for manufacturing such high-strength steel, and methods for manufacturing steel pipe from such high-strength steel, is disclosed.

公开(公告)号：US20180066332A1

公开(公告)日：2018-03-08

申请号：US15560013

申请日：2015-03-27

申请人： JFE STEEL CORPORATION

发明人： Shusaku Ota ,  Junji Shimamura ,  Nobuyuki Ishikawa ,  Shigeru Endo

IPC分类号： C21D9/08 ,  C21D8/10 ,  C21D6/00 ,  C22C38/58 ,  C22C38/50 ,  C22C38/48 ,  C22C38/46 ,  C22C38/44 ,  C22C38/42 ,  C22C38/38 ,  C22C38/28 ,  C22C38/26 ,  C22C38/16 ,  C22C38/14 ,  C22C38/12 ,  C22C38/08 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00

CPC分类号： C21D9/08 ,  C21D6/004 ,  C21D6/005 ,  C21D6/008 ,  C21D8/02 ,  C21D8/10 ,  C21D8/105 ,  C21D9/46 ,  C21D2211/002 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/22 ,  C22C38/26 ,  C22C38/28 ,  C22C38/38 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/58

摘要： A high-strength steel having a specified chemical composition, wherein parameter Peff is 0.050% or more, the relationship (TS0−TS)/TS0≦0.050 is satisfied, wherein TS is defined as tensile strength determined at a temperature of 350° C. after aging has been performed under the condition of a Larson-Miller Parameter (LMP) of 15700, and wherein TS0 is defined as tensile strength determined at a temperature of 350° C. before the aging is performed, and having a toughness represented by a vE−20 of 100 J or more in a weld heat-affected zone, which is formed when welding is performed.

公开(公告)号：US20160312327A1

公开(公告)日：2016-10-27

申请号：US15103093

申请日：2014-12-10

申请人： JFE STEEL CORPORATION

发明人： Katsuyuki Ichimiya ,  Shigeki Kitsuya ,  Kazukuni Hase ,  Shigeru Endo

IPC分类号： C21D9/46 ,  C22C38/54 ,  C22C38/50 ,  C22C38/48 ,  C22C38/46 ,  C22C38/44 ,  C22C38/42 ,  C22C38/16 ,  C22C38/14 ,  C22C38/12 ,  C22C38/08 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C21D8/02 ,  C22C38/58

CPC分类号： C21D9/46 ,  C21D8/02 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0263 ,  C21D9/50 ,  C21D2211/004 ,  C22C38/001 ,  C22C38/002 ,  C22C38/005 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54 ,  C22C38/58

摘要： A steel plate includes a predetermined chemical composition, in which B is controlled to be less than 0.0003%, and the balance is Fe and incidental impurities. The steel plate also includes precipitates containing Ti, Nb, and Mo and having a mean particle size of 20 nm or less, the relationship [Nb]/([Ti]+[Nb]+[Mo])≧0.3 being satisfied, where [Ti] is the Ti content, [Nb] is the Nb content, and [Mo] is the Mo content, thereby providing a thick, high tensile strength steel plate that is suitable for use in steel structures such as marine structures, ships, pressure vessels, and penstocks, has a yield stress (YS) of 460 MPa or greater, and has excellent low-temperature toughness of the heat-affected zone in a multilayer weld (CTOD property) and excellent strength and toughness after Post Weld Heat Treatment (PWHT property).

摘要翻译： 钢板包括预定的化学组成，其中B被控制在小于0.0003％，余量为Fe和杂质。 钢板还含有含有Ti，Nb，Mo的平均粒径为20nm以下的析出物，满足[Nb] /（[Ti] + [Nb] + [Mo]）≥0.3的关系， [Ti]为Ti含量，[Nb]为Nb含量，[Mo]为Mo含量，由此提供厚度高的抗拉强度钢板，适用于海洋结构，船舶， 压力容器和回液管的屈服应力（YS）为460MPa以上，并且在多层焊接中的热影响区域（CTOD性质）具有优异的低温韧性，并且在焊后热处理后具有优异的强度和韧性 （PWHT属性）。

公开(公告)号：US20160017456A1

公开(公告)日：2016-01-21

申请号：US14774351

申请日：2014-03-05

申请人： JFE STEEL CORPORATION

发明人： Yusuke Terazawa ,  Katsuyuki Ichimiya ,  Kazukuni Hase ,  Shigeru Endo

IPC分类号： C21D9/46 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C21D1/84 ,  C22C38/16 ,  C22C38/14 ,  C22C38/12 ,  C21D6/00 ,  C21D8/02 ,  C22C38/50 ,  C22C38/00

CPC分类号： 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

摘要： 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.

摘要翻译： 提供了一种具有良好的用于低至中等热输入的多通道焊接CTOD特性的厚钢板和用于制造厚钢板的方法。 以质量％计含有C：0.03％〜0.12％，Si：0.5％以下，Mn：1.0％〜2.0％，P：0.015％以下，S：0.0005〜0.0050％的Al钢，Al ：0.005〜0.060％，Ni：0.5〜2.0％，Ti：0.005〜0.030％，N：0.0015〜0.0065％，O：0.0010〜0.0050％，Ca：0.0005〜0.0060％ 或两种以上的Cu等，其中Ti / N，Ceq，Pcm和ACR在特定范围内，板的基材在板的厚度的一半处具有20μm或更小的有效晶粒尺寸， 并且该板在板的厚度的1/4和1/2处含有特定数量的复杂夹杂物，复合夹杂物由含有Ca和Mn的硫化物和含有Al的氧化物组成，其等效圆直径为0.1μm以上。 将具有上述组成的钢在特定温度下加热，然后热轧并冷却。

公开(公告)号：US10036079B2

公开(公告)日：2018-07-31

申请号：US14774351

申请日：2014-03-05

申请人： JFE STEEL CORPORATION

发明人： Yusuke Terazawa ,  Katsuyuki Ichimiya ,  Kazukuni Hase ,  Shigeru Endo

IPC分类号： 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分类号： 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

摘要： 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

申请人： JFE Steel Corporation

发明人： Shigeki Kitsuya ,  Katsuyuki Ichimiya ,  Kazukuni Hase ,  Shigeru Endo

IPC分类号： 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分类号： 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

摘要： 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.

摘要翻译： 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：US20160083820A1

公开(公告)日：2016-03-24

申请号：US14779755

申请日：2014-03-25

申请人： JFE STEEL CORPORATION

发明人： Tatsumi Kimura ,  Kiyoshi Uwai ,  Shigeru Endo ,  Moriyasu Yamaguchi

IPC分类号： C22C38/28 ,  C21D9/04 ,  C21D6/00 ,  C22C38/26 ,  C22C38/24 ,  C22C38/22 ,  C22C38/16 ,  C22C38/14 ,  C22C38/12 ,  C22C38/08 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C21D8/00

CPC分类号： C22C38/28 ,  C21D6/001 ,  C21D6/002 ,  C21D6/005 ,  C21D6/008 ,  C21D8/00 ,  C21D8/005 ,  C21D9/04 ,  C21D2211/009 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/005 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/18 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/50

摘要： A pearlitic rail includes a composition including in % by mass: 0.70% to 0.90% of C; 0.1% to 1.5% of Si; 0.01% to 1.5% of Mn; 0.001% to 0.035% of P; 0.0005% to 0.030% of S; 0.1% to 2.0% of Cr, remainder of the composition consisting of Fe and inevitable impurities. Surface hardness of a rail top is not less than HB 430, and hardness at a depth of 25 mm from a surface of the rail top is not less than HB 410.

摘要翻译： 珠光体钢轨包括以质量％计的组成：C的0.70〜0.90％ 0.1％〜1.5％的Si; 0.01％〜1.5％的Mn; 0.001％〜0.035％的P; 0.0005％〜0.030％的S; 0.1％至2.0％的Cr，组成的剩余部分由Fe和不可避免的杂质组成。 轨顶的表面硬度不小于HB 430，并且距离轨道顶部的表面的深度为25mm的硬度不小于HB 410。

公开(公告)号：US10767250B2

公开(公告)日：2020-09-08

申请号：US15560613

申请日：2016-03-25

申请人： JFE STEEL CORPORATION

发明人： Junji Shimamura ,  Nobuyuki Ishikawa ,  Shigeru Endo ,  Shusaku Ota

IPC分类号： C21D8/02 ,  C22C38/14 ,  C22C38/58 ,  C22C38/00 ,  B23K31/02 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/54 ,  C22C38/56 ,  B23K101/06 ,  B23K103/04

摘要： Disclosed is, as a high-strength steel plate of API X80 grade or higher with a thickness of 38 mm or more, a thick steel plate for structural pipes or tubes that exhibits high strength in the rolling direction, excellent Charpy properties at its mid-thickness part, and high material homogeneity without addition of large amounts of alloying elements. The thick steel plate for structural pipes or tubes disclosed herein has: a specific chemical composition; a microstructure mainly composed of bainite; a tensile strength of 620 MPa or more; a Charpy absorption energy vE−20° C. at −20° C. at the mid-thickness part of 100 J or more; a variation of Vickers hardness in a plate thickness direction ΔHV10,t of 50 or less; and a variation of Vickers hardness in a plate widthwise direction ΔHV10,c of 50 or less.