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    High strength line pipe steel having low yield ratio and excellent in low temperature toughness
    22.
    发明授权
    High strength line pipe steel having low yield ratio and excellent in low temperature toughness 失效
    具有低屈服比，低温韧性优异的高强度线管钢

    公开(公告)号：US5755895A

    公开(公告)日：1998-05-26

    申请号：US718567

    申请日：1996-10-10

    申请人： Hiroshi Tamehiro ,  Hitoshi Asahi ,  Takuya Hara ,  Yoshio Terada

    发明人： Hiroshi Tamehiro ,  Hitoshi Asahi ,  Takuya Hara ,  Yoshio Terada

    IPC分类号： C22C38/04 ,  C22C38/44 ,  C22C38/48

    CPC分类号： C22C38/04 ,  Y10S148/909

    摘要： An ultra-high strength low yield ratio line pipe steel has an excellent HAZ toughness and field weldability and has a tensile strength of at least 950 MPa (exceeding X100 of the API standard). The steel is of a low carbon-high Mn-Ni-Mo-Nb-trace Ti type selectively containing B, Cu, Cr and V, whenever necessary. Its micro-structure comprises a martensite/bainite and ferrite soft/hard two-phase mixed structure having a ferrite fraction of 20 to 90%. This ferrite contains 50 to 1000 of worked ferrite, and the ferrite grain size is not greater than 5 Am. The production of an ultra-high strength low yield ratio line pipe steel (exceeding X100) excellent in low temperature toughness and field weldability becomes possible. As a result, the safety of a pipeline can be remarkably improved, and execution efficiency and transportation efficiency of the pipeline can be drastically improved.

    摘要翻译： PCT No.PCT / JP96 / 00157 Sec。 371日期：1996年10月1日 102（e）日期1996年10月1日PCT 1996年1月26日PCT PCT。 第WO96 / 23909号公报 日期1996年8月8日超高强度低屈服比管线钢具有优异的HAZ韧性和现场焊接性，拉伸强度至少为950MPa（超过API标准的X100）。 该钢是选择性含有B，Cu，Cr和V的低碳高Mn-Ni-Mo-Nb-微量Ti型。 其微结构包括铁素体分数为20〜90％的马氏体/贝氏体和铁素体软/硬两相混合结构。 该铁氧体含有50〜1000个加工铁素体，铁素体晶粒尺寸不大于5A。 可以生产出具有优异的低温韧性和现场焊接性的超高强度低屈服比管线钢管（超过X100）。 因此，可以显着提高管道的安全性，可以显着提高管道的执行效率和运输效率。

    Steel plates for ultra-high-strength linepipes and ultra-high-strength linepipes having excellent low-temperature toughness and manufacturing methods thereof
    25.
    发明申请
    Steel plates for ultra-high-strength linepipes and ultra-high-strength linepipes having excellent low-temperature toughness and manufacturing methods thereof 有权
    具有优异的低温韧性的超高强度线管和超高强度线管用钢板及其制造方法

    公开(公告)号：US20070125462A1

    公开(公告)日：2007-06-07

    申请号：US10582830

    申请日：2004-12-17

    申请人： Hitoshi Asahi ,  Takuya Hara

    发明人： Hitoshi Asahi ,  Takuya Hara

    IPC分类号： C22C38/12 ,  C22C38/14

    CPC分类号： C22C38/12 ,  C21D8/02 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0263 ,  C21D8/105 ,  C21D9/08 ,  C21D9/46 ,  C21D2211/002 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/14 ,  C22C38/16 ,  C22C38/22 ,  C22C38/26 ,  C22C38/28 ,  C22C38/38 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54 ,  C22C38/58

    摘要： Ultra-high-strength linepipes having excellent low-temperature toughness manufactured by welding together the edges of steel plates comprising C of 0.03 to 0.07 mass %, Si of not more than 0.6 mass %, Mn of 1.5 to 2.5 mass %, P of not more than 0.015 mass %, S of not more than 0.003 mass %, Ni of 0.1 to 1.5 mass %, Mo of 0.15 to 0.60 mass %, Nb of 0.01 to 0.10 mass %, Ti of 0.005 to 0.030 mass %, Al of not more than 0.06 mass %, one or more of required amounts of B, N, V, Cu, Cr, Ca, REM (rare-earth metals) and Mg, with the remainder consisting of iron and unavoidable impurities and having a (Hv-ave)/(Hv-M) ratio between 0.8 and 0.9 at 2.5≦P≦4.0, wherein Hv-ave is the average Vickers hardness in the direction of the thickness of the base metal and Hv-M is the martensite hardness depending on C-content (Hv-M=270+1300C) and a tensile strength TS-C between 900 MPa and 1100 MPa; P=2.7C+0.4Si+Mn+0.8Cr+0.45(Ni+Cu)+(1+β)Mo−1+β (β=1 when B≧3 ppm and β=0 when B

    摘要翻译： 通过将包含0.03〜0.07质量％的C，不大于0.6质量％的Si，1.5〜2.5质量％的Mn，1.5〜2.5质量％的Mn，不为P的钢板的边缘焊接在一起，制造出优异的低温韧性的超高强度线管 大于0.015质量％，S：0.003质量％以下，Ni：0.1〜1.5质量％，Mo：0.15〜0.60质量％，Nb：0.01〜0.10质量％，Ti：0.005〜0.030质量％ 大于0.06质量％，所需量的B，N，V，Cu，Cr，Ca，REM（稀土金属）和Mg中的一种或多种，​​其余由铁和不可避免的杂质组成，并具有（Hv- ave）/（Hv-M）的比例在2.5 <= P <= 4.0时为0.8-0.9，其中Hv-ave是贱金属厚度方向上的维氏硬度平均值，Hv-M是马氏体硬度取决于 （Hv-M = 270±1300℃），拉伸强度TS-C在900MPa〜1100MPa之间; 当B> = 3ppm时，P = 2.7C + 0.4Si + Mn + 0.8Cr + 0.45（Ni + Cu）+（1 +β）Mo-1 +β（当B <3ppm时，β= 。

    Ultrahigh strength welded joint and ultrahigh strength welded steel pipe excellent in cold cracking resistance of weld metal, and methods for producing the same
    26.
    发明申请
    Ultrahigh strength welded joint and ultrahigh strength welded steel pipe excellent in cold cracking resistance of weld metal, and methods for producing the same 有权
    焊接金属的耐寒裂纹性优异的超高强度焊接接头和超高强度焊接钢管及其制造方法

    公开(公告)号：US20050016980A1

    公开(公告)日：2005-01-27

    申请号：US10898307

    申请日：2004-07-23

    申请人： Takuya Hara ,  Hitoshi Asahi

    发明人： Takuya Hara ,  Hitoshi Asahi

    IPC分类号： B21C37/08 ,  B23K9/00 ,  B23K9/025 ,  B23K9/18 ,  B23K9/23 ,  B23K35/02 ,  B23K35/30 ,  C21D8/10 ,  C21D9/08 ,  C21D9/50 ,  C22C38/00 ,  C22C38/58

    CPC分类号： B23K35/0261 ,  B23K9/0253 ,  B23K9/186 ,  B23K9/23 ,  B23K35/3066 ,  B23K2101/06 ,  B23K2103/04 ,  Y10T428/12972

    摘要： The present invention, in a welded joint of steel sheets and a steel pipe body having a tensile strength of 800 MPa or more (over X100 in API Standards), provides: the welded joint of the steel sheets and the steel pipe produced by forming a steel sheet into a cylindrical shape and welding both the ends thereof, both excellent in cold cracking resistance; and methods for producing them. The present invention includes an ultrahigh strength welded joint and an ultrahigh strength welded steel pipe excellent in the cold cracking resistance of a weld metal, characterized in that the amount of non-diffusible hydrogen in the inner side weld metal is 0.01 ppm or more. It is preferable that the ratio of the non-diffusible hydrogen amount to the total hydrogen amount in said inner side weld metal is 0.5% or more. Further, it is preferable that Mo carbide is contained by not less than 1 piece/μm2 in said inner side weld metal. The present invention also includes a method for producing said welded joint and welded steel pipe, characterized by welding the butted portion from the inner side and thereafter welding it from the outer side so that the reheating temperature of the inner side weld metal may reach within the range from 500° C. to 700° C.

    摘要翻译： 本发明在钢板焊接接头和抗拉强度为800MPa以上（在API标准中为X100以上）的钢管体中，提供：钢板的焊接接头和通过形成 钢板成为圆筒状并焊接其两端，耐寒性均优异; 及其生产方法。 本发明包括焊接金属的耐寒裂性优异的超高强度焊接接头和超高强度焊接钢管，其特征在于，内侧焊接金属中的非扩散性氢的量为0.01ppm以上。 优选所述内侧焊接金属中的所述非扩散性氢量与所述总氢量的比率为0.5％以上。 此外，优选在所述内侧焊接金属中含有不小于1个/ m 2的Mo碳化物。 本发明还包括一种用于制造所述焊接接头和焊接钢管的方法，其特征在于，从内侧焊接对接部分，然后从外侧焊接，使得内侧焊接金属的再加热温度可达到 范围从500°C到700°C

    Ultra-high strength, weldable steels with excellent ultra-low temperature toughness
    27.
    发明授权
    Ultra-high strength, weldable steels with excellent ultra-low temperature toughness 失效
    超高强度，可焊接的钢，具有优异的超低温韧性

    公开(公告)号：US06264760B1

    公开(公告)日：2001-07-24

    申请号：US09123625

    申请日：1998-07-28

    申请人： Hiroshi Tamehiro ,  Hitoshi Asahi ,  Takuya Hara ,  Yoshio Terada ,  Michael J. Luton ,  Jayoung Koo ,  Narasimha-Rao V. Bangaru ,  Clifford W. Petersen

    发明人： Hiroshi Tamehiro ,  Hitoshi Asahi ,  Takuya Hara ,  Yoshio Terada ,  Michael J. Luton ,  Jayoung Koo ,  Narasimha-Rao V. Bangaru ,  Clifford W. Petersen

    IPC分类号： C22C3808

    CPC分类号： C21D8/0226 ,  C21D1/19 ,  C21D2211/002 ,  C21D2211/008 ,  C22C38/04 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14

    摘要： An ultra-high strength steel having excellent ultra-low temperature toughness, a tensile strength of at least about 930 MPa (135 ksi), and a microstructure comprising predominantly fine-grained lower bainite, fine-grained lath martensite, or mixtures thereof, transformed from substantially unrecrystallized austenite grains and comprising iron and specified weight percentages of the additives: carbon, silicon, manganese, copper, nickel, niobium, vanadium, molybdenum, chromium, titanium, aluminum, calcium, Rare Earth Metals, and magnesium, is prepared by heating a steel slab to a suitable temperature; reducing the slab to form plate in one or more hot rolling passes in a first temperature range in which austenite recrystallizes; further reducing said plate in one or more hot rolling passes in a second temperature range below said first temperature range and above the temperature at which austenite begins to transform to ferrite during cooling; quenching said plate to a suitable Quench Stop Temperature; and stopping said quenching and allowing said plate to air cool to ambient temperature.

    摘要翻译： 具有优异的超低温韧性，至少约930MPa（135ksi）的拉伸强度和主要包含细粒度的下贝氏体，细粒状板条马氏体或其混合物的微观结构的超高强度钢被转化 来自基本上未再结晶的奥氏体晶粒并且包含铁和指定重量百分比的添加剂：碳，硅，锰，铜，镍，铌，钒，钼，铬，钛，​​铝，钙，稀土金属和镁，由 将钢板加热到合适的温度; 在奥氏体重结晶的第一温度范围内，在一个或多个热轧道中将板坯还原成板; 在低于所述第一温度范围的第二温度范围内并且高于在冷却期间奥氏体开始转变为铁素体的温度的一个或多个热轧道中进一步减少所述板; 将所述板淬火至合适的淬火停止温度; 并停止所述淬火并允许所述板空气冷却至环境温度。

    Weldable high strength steel having excellent low temperature toughness
    28.
    发明授权
    Weldable high strength steel having excellent low temperature toughness 失效
    具有优异的低温韧性的可焊接高强度钢

    公开(公告)号：US5798004A

    公开(公告)日：1998-08-25

    申请号：US714098

    申请日：1997-01-14

    申请人： Hiroshi Tamehiro ,  Hitoshi Asahi ,  Takuya Hara ,  Yoshio Terada

    发明人： Hiroshi Tamehiro ,  Hitoshi Asahi ,  Takuya Hara ,  Yoshio Terada

    IPC分类号： C21D8/02 ,  C22C38/04 ,  C22C38/08 ,  C22C38/48

    CPC分类号： C21D8/0226 ,  C22C38/04 ,  C21D2211/002 ,  C21D2211/008 ,  C21D8/0263

    摘要： This invention adds elements such as Cu, B, Cr, Ca, V, etc., to a low carbon-high Mn--Ni--Mo-trace Ti type steel, and allows the steel to have a tempered martensite/bainite mixed structure containing at least 60% of tempered martensite transformed from un-recrystallized austenite having a mean austenite grain size (d.gamma.) of not greater than 10 .mu.m as a micro-structure, or a tempered martensite structure containing at least 90% of martensite transformed from un-recrystallized austenite. The present invention further stipulates a P value to the range of 1.9 to 4.0 and thus provides a ultra-high strength steel having a tensile strength of at least 950 MPa (not lower than 100 of the API standard) and excellent in low temperature toughness, HAZ toughness and field weldability in cold districts.

    摘要翻译： PCT No.PCT / JP96 / 00155 Sec。 371日期1997年1月14日 102（e）1997年1月14日PCT PCT 1996年1月26日PCT公布。 公开号WO96 / 23083 日期1996年8月1日本发明将诸如Cu，B，Cr，Ca，V等的元素添加到低碳高Mn-Ni-Mo-Trace Ti型钢中，并允许钢具有回火马氏体 或含有至少60％的平均奥氏体晶粒尺寸（dγ）不大于10μm的未再结晶奥氏体作为微结构的回火马氏体的贝氏体混合结构，或包含至少90°的回火马氏体组织 从未再结晶奥氏体转变的马氏体的％。 本发明进一步规定P值在1.9〜4.0的范围内，由此提供抗拉强度为至少950MPa（API标准的100以上），低温韧性优异的超高强度钢， 冷区的HAZ韧性和现场焊接性。

    High-strength steel pipe and producing method thereof
    30.
    发明授权
    High-strength steel pipe and producing method thereof 有权
    高强度钢管及其制造方法

    公开(公告)号：US08685182B2

    公开(公告)日：2014-04-01

    申请号：US13261070

    申请日：2010-06-10

    申请人： Kensuke Nagai ,  Yasuhiro Shinohara ,  Shinya Sakamoto ,  Takuya Hara ,  Hitoshi Asahi

    发明人： Kensuke Nagai ,  Yasuhiro Shinohara ,  Shinya Sakamoto ,  Takuya Hara ,  Hitoshi Asahi

    IPC分类号： C22C38/48 ,  C22C38/50 ,  C21D8/10

    CPC分类号： C22C38/04 ,  C21D8/02 ,  C21D9/08 ,  C21D2211/002 ,  C22C38/001 ,  C22C38/06 ,  C22C38/26 ,  C22C38/28 ,  C22C38/42 ,  C22C38/44 ,  C22C38/48 ,  C22C38/50 ,  C22C38/58

    摘要： This high-strength steel pipe includes, by mass %, C: 0.02% to 0.09%, Mn: 0.4% to 2.5%, Cr: 0.1% to 1.0%, Ti: 0.005% to 0.03%, Nb: 0.005% to 0.3%, and a balance consisting of Fe and inevitable impurities, in which Si, Al, P, S, and N are limited to 0.6% or less, 0.1% or less, 0.02% or less, 0.005% or less, 0.008% or less, respectively, the bainite transformation index BT is 650° C. or less, and the microstructure thereof is a single bainite microstructure including first bainite and second bainite, the first bainite being a gathered microstructure of bainitic ferrite including no carbide, and the second bainite being a mixed microstructure of bainitic ferrite including no carbide and cementite between the bainitic ferrites.

    摘要翻译： 该高强度钢管以质量％计含有C：0.02％〜0.09％，Mn：0.4〜2.5％，Cr：0.1〜1.0％，Ti：0.005〜0.03％，Nb：0.005〜0.3 ％，余量由Fe和不可避免的杂质组成，其中Si，Al，P，S和N分别为0.6％以下，0.1％以下，0.02％以下，0.005％以下，0.008％以下 贝氏体相变指数BT分别为650℃以下，其微观结构为包括第一贝氏体和第二贝氏体的单贝氏体组织，第一贝氏体为不含碳化物的贝氏体铁素体的集聚组织，第二贝氏体组织 贝氏体是贝氏体铁素体之间不含碳化物和渗碳体的贝氏体铁素体的混合微观结构。