公开(公告)号：EP4116453A1

公开(公告)日：2023-01-11

申请号：EP20923002.8

申请日：2020-03-04

申请人： NIPPON STEEL CORPORATION

发明人： HARA, Takuya ,  SHINOHARA, Yasuhiro ,  FUJISHIRO, Taishi ,  EBIHARA, Kiyoshi ,  TSURU, Eiji

IPC分类号： C22C38/00 ,  C21D8/02 ,  C21D9/08 ,  C21D9/50 ,  C22C38/58

摘要： What is provided is a steel pipe including a base material portion and a welded portion, in which the base material portion has a predetermined chemical composition, a metallographic structure of a surface layer area in a range of 1 mm of a depth from a surface of the base material portion consists of one or more selected from polygonal ferrite, granular bainite, acicular ferrite, and bainite, a maximum hardness of the base material portion in the surface layer area is 250 HV or less, a yield stress is 415 to 630 MPa, and a proportional limit in a stress-strain curve is 90% or more of the yield stress.

公开(公告)号：EP3872205A1

公开(公告)日：2021-09-01

申请号：EP19915622.5

申请日：2019-02-19

申请人： NIPPON STEEL CORPORATION

发明人： HARA, Takuya ,  SAKAMOTO, Shinya ,  IWAMOTO, Shuji ,  KOBAYASHI, Shunichi ,  AMANO, Toshihiko ,  TASHIMA, Kenzo ,  NAGAI, Kensuke

IPC分类号： C22C38/00 ,  C22C38/58 ,  C21D9/08 ,  C21D1/18 ,  C21D6/00 ,  C21D8/02 ,  C21D8/10 ,  C21D9/46 ,  C22C38/02 ,  C22C38/04 ,  B23K9/025 ,  B23K11/00 ,  B23K11/06 ,  C21D9/50 ,  B21C37/06 ,  B23K101/10 ,  B23K103/04

摘要： An electric resistance welded steel pipe for a linepipe, the steel pipe having a chemical composition including, in terms of % by mass, 0.04 to 0.12% of C, 0.01 to 0.50% of Si, 0.5 to 2.0% of Mn, 0.005 to 0.030% of Ti, 0.005 to 0.050% of Nb, 0.001 to 0.008% of N, and a balance including of Fe and impurities; wherein, in the steel pipe, in a case in which a thickness of the base metal portion is defined as t B , and a thickness of the electric resistance welded portion is defined as ts, a value obtained by subtracting a hardness of the 1/2t B portion from a hardness of the outer surface layer portion B is 30 HV10 or less and a value obtained by subtracting a hardness of the 1/2t S portion from a hardness of the outer surface layer portion S is from 0 HV10 to 30 HV10, and each of the t B and the ts is 15 mm or more.

公开(公告)号：EP2264205B1

公开(公告)日：2019-08-28

申请号：EP09730216.0

申请日：2009-04-07

申请人： Nippon Steel Corporation

发明人： FUJISHIRO, Taishi ,  SAKAMOTO, Shinya ,  HARA, Takuya ,  ASAHI, Hitoshi

IPC分类号： C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/14 ,  C21D7/12 ,  C21D8/02 ,  C21D8/10 ,  C21D9/08 ,  B21C37/08 ,  C22C38/58 ,  C22C38/08 ,  C22C38/16 ,  C22C38/22 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/38

公开(公告)号：EP2264205A1

公开(公告)日：2010-12-22

申请号：EP09730216.0

申请日：2009-04-07

申请人： Nippon Steel Corporation

发明人： FUJISHIRO, Taishi ,  SAKAMOTO, Shinya ,  HARA, Takuya ,  ASAHI, Hitoshi

IPC分类号： C22C38/00 ,  B21C37/08 ,  C21D8/02 ,  C22C38/14 ,  C22C38/58

CPC分类号： C21D7/12 ,  B21C37/08 ,  C21D8/0231 ,  C21D8/0273 ,  C21D8/10 ,  C21D9/08 ,  C21D2211/002 ,  C21D2211/005 ,  C21D2211/008 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/005 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/22 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/38 ,  C22C38/44 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54 ,  C22C38/58 ,  Y10T428/12292 ,  Y10T428/12653 ,  Y10T428/12958 ,  Y10T428/12965 ,  Y10T428/12972

摘要： The present invention provides high strength steel plate with excellent low temperature toughness, high strength steel pipe using this as a base metal, and methods of production of the same. The steel plate of the present invention contains Mo: 0.05 to 1.00% and B: 0.0003 to 0.0100%, has a Ceq of 0.30 to 0.53, has a Pcm of 0.10 to 0.20, and has a metal structure which has an area percentage of polygonal ferrite of 20 to 90% and has a balance of a hard phase comprised of one or both of bainite and martensite. To obtain this steel plate, strain-introducing rolling is performed with a start temperature of not more than Ar 3 +60°C, an end temperature of Ar 3 or more, and a reduction ratio of 1.5 or more, then the plate is air-cooled and then acceleratedly cooled from Ar 3 -100°C to Ar 3 -10°C in temperature by 10°C/s or more.

摘要翻译： 本发明提供具有优良的低温韧性，以此作为基体金属的高强度钢管，和生产中相同的方法高强度钢板。 本发明的钢板含有Mo：0.05〜1：00％和B：0.0003〜0.0100％，具有12点半一个CEQ到12点53，具有12点10分至12时二十一PCM，并具有具有在多边形区域百分比的金属结构 的20〜90％铁素体和具有由一个的硬质相的平衡或两者贝氏体和马氏体的。 为了获得该钢板，应变导入轧制，进行与Ar 3相以上的最终温度不超过Ar 3相+ 60℃的开始温度，和1.5或更大的压缩比，则所述板是空气 -cooled然后冷却速度加速选自Ar 3 -100℃以10℃/ s以上至Ar在温度3 -10℃。

公开(公告)号：EP2105513A1

公开(公告)日：2009-09-30

申请号：EP07850314.1

申请日：2007-12-04

申请人： Nippon Steel Corporation

发明人： HARA, Takuya ,  ASAHI, Hitoshi

IPC分类号： C22C38/00 ,  B21C37/08 ,  C21D8/02 ,  C21D9/08 ,  C21D9/50 ,  C22C38/14 ,  C22C38/58

CPC分类号： C22C38/02 ,  B21C37/08 ,  B23K9/0253 ,  B23K2201/06 ,  B23K2203/04 ,  C21D8/021 ,  C21D8/0226 ,  C21D9/08 ,  C21D9/50 ,  C21D9/505 ,  C21D2211/001 ,  C21D2211/002 ,  C21D2211/005 ,  C21D2211/008 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/14 ,  Y10T428/12292 ,  Y10T428/12653 ,  Y10T428/12958 ,  Y10T428/12965 ,  Y10T428/12972

摘要： The present invention provides high strength thick welded steel pipe for line pipe superior in low temperature toughness, and a method of production of the same. A base material steel plate containing C: 0.010 to 0.050%, Si: 0.01 to 0.50%, Mn: 0.50 to 2.00%, Al: 0.020% or less, Ti: 0.003 to 0.030%, and Mo: 0.10 to 1.50%, having a carbon equivalent Ceq of 0.30 to 0.53, having a crack susceptability parameter Pcm of 0.10 to 0.20, satisfying formula 3, comprised an area ratio of 20% or less of polygonal ferrite and an area ratio of 80% or more of bainite, and having an effective crystal grain size of 20 µm or less is formed into a pipe shape, then seam welded to make the effective crystal grain size of the heat affected zone 150 µm or less: 10 ⁢ C + 100 ⁢ Al + 5 ⁢ Mo + 5 ⁢ Ni 3.3

摘要翻译： 本发明提供高强度厚壁焊接钢管管线管用的低温韧性优异，并且生产中相同的方法。 甲母材钢板含有C：0.010〜0.050％以下，Si：0.01〜12：50％以下，Mn：0.50〜2：00％以下，Al：0.020％以下，Ti：0.003〜0.030％和Mo：0.10〜1.50％，具有 碳的12:30至12点53分当量Ceq，具有12:10的裂纹敏感性测定指数Pcm至12:20，满足式3，由多边形铁素体为20％或更小的面积比，并或80％的面积比更贝氏体，以及具有 在20微米或更小被形成为管形状有效晶体粒径，然后缝焊，使热影响区的有效晶体粒径为150微米或更小：10¢C¢的Al + 100 + 5¢ 沫+ 5¢镍<3.3

公开(公告)号：EP2039793A1

公开(公告)日：2009-03-25

申请号：EP07743726.7

申请日：2007-05-14

申请人： Nippon Steel Corporation

发明人： ASAHI, Hitoshi ,  HARA, Takuya ,  DOI, Naoki ,  TERADA, Yoshio

IPC分类号： C22C38/00 ,  B21B1/26 ,  B21B3/00 ,  B21C37/08 ,  B23K9/18 ,  C21D8/02 ,  C22C38/58 ,  B23K101/06

CPC分类号： B21B3/00 ,  B21C37/08 ,  B23K9/18 ,  B23K2201/06 ,  B23K2203/04 ,  C21D6/005 ,  C21D8/0226 ,  C21D9/08 ,  C21D9/085 ,  C22C38/02 ,  C22C38/42 ,  C22C38/44 ,  C22C38/48 ,  C22C38/58 ,  F16L9/02

摘要： The present invention provides steel plate for high strength line pipe suppressing the rise in yield strength in the longitudinal direction of expanded steel pipe due to the heating at the time of coating to prevent corrosion and superior in strain aging resistance and steel pipe for the material for the same, that is, high strength steel pipe for line pipe superior in strain aging resistance characterized in that a base material having a composition of chemical elements containing, by mass%, Mo: over 0% to less than 0.15% and Mn: 1.7 to 2.5%, satisfying Mo/Mn: over 0 to 0.08, containing C, Si, P, S, Al, Ti, N, and B, furthermore containing one or more of Ni, Cu, and Cr, having a balance of iron and unavoidable impurities, having a P value of 2.5 to 4.0 in range, and having a metallurgical structure comprised of bainite and martensite: P - value = 2.7 ⁢ C + 0.4 ⁢ Si + Mn + 0.8 ⁢ Cr + 0.45 ( Ni + Cu ) + 2 ⁢ Mo .
Furthermore, it may contain one or more of Nb, V, Ca, REM, and Mg.

摘要翻译： 本发明提供了一种高强度干线用管抑制屈服强度的上升膨胀钢管的长度方向钢板由于在涂层的时间，以防止在应变腐蚀和卓越的加热老化性和钢管的材料 相同的，所做的是，高强度钢管的管线管用在特征的抗应变时效性优异的那样具有含化学元素的组合物的基体材料，以质量％以下，Mo：超过0％但不到0.15％至和Mn：1.7 ，此外更含有一种或多种镍，铜，大于0至12:08的，含有的C，Si，P，S，铝，钛，N和B和Cr，具有余量的铁：〜2.5％，满足沫/ Mn为 和不可避免的杂质，具有2.5至4.0范围中P值，并具有由贝氏体和马氏体的金属组织：P - 值= 2.7¢C + 0.4¢的Si +的Mn + 0.8¢的Cr + 12:45（镍 + Cu）的+ 2¢MO。 进一步，它可以含有一个以上的Nb，V，钙，REM，Mg中。

公开(公告)号：EP2532765B1

公开(公告)日：2020-01-15

申请号：EP11739858.6

申请日：2011-02-04

申请人： NIPPON STEEL CORPORATION

发明人： FUJISHIRO, Taishi ,  HARA, Takuya ,  TERADA, Yoshio ,  SAKAMOTO, Shinya ,  ASAHI, Hitoshi

IPC分类号： C22C38/00 ,  B21C37/08 ,  B23K9/025 ,  B23K9/18 ,  B23K9/23 ,  B23K31/00 ,  C21D8/10 ,  C21D9/08 ,  C21D9/50 ,  C22C38/14 ,  C22C38/58 ,  B23K35/30 ,  C22C38/02 ,  C22C38/04 ,  C22C38/12 ,  B23K31/02 ,  B23K103/04 ,  B23K101/06

公开(公告)号：EP2532765A1

公开(公告)日：2012-12-12

申请号：EP11739858.6

申请日：2011-02-04

申请人： Nippon Steel Corporation

发明人： FUJISHIRO, Taishi ,  HARA, Takuya ,  TERADA, Yoshio ,  SAKAMOTO, Shinya ,  ASAHI, Hitoshi

IPC分类号： C22C38/00 ,  B21C37/08 ,  B23K9/025 ,  B23K9/18 ,  B23K9/23 ,  B23K31/00 ,  C21D8/10 ,  C21D9/08 ,  C21D9/50 ,  C22C38/14 ,  C22C38/58 ,  B23K35/30

CPC分类号： B23K35/3053 ,  B23K31/027 ,  B23K2101/06 ,  B23K2103/04 ,  C21D8/105 ,  C21D9/08 ,  C21D9/50 ,  C21D2211/002 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/12 ,  C22C38/14 ,  Y10S148/909

摘要： A high-strength welded steel pipe is obtained by welding a seam weld portion of a steel plate that are formed in a pipe shape. In the high-strength welded steel pipe, a base metal of the steel plate includes, by mass%, C: 0.010% to 0.080%, Si: 0.01% to 0.50%, Mn: 0.50% to 2.00%, S: 0.0001% to 0.0050%, Ti: 0.003% to 0.030%, Mo: 0.05% to 1.00%, B: 0.0003% to 0.0100%, O: 0.0001% to 0.0080%, N: 0.006% to 0.0118%, P: limited to 0.050% or less, Al: limited to 0.008% or less, and the balance of Fe and inevitable impurities, Ceq is 0.30 to 0.53, Pcm is 0.10 to 0.20, [N] - [Ti] /3.4 is less than 0.003, the average grain size of the prior γ grains in heat affected zones in the steel plate is 250 µm or less, and the prior γ grains include bainite and intragranular bainite.

摘要翻译： 通过焊接形成为管状的钢板的焊缝部分来获得高强度焊接钢管。 在高强度焊接钢管中，钢板的贱金属以质量％计含有C：0.010〜0.080％，Si：0.01〜0.50％，Mn：0.50〜2.00％，S：0.0001％ 至0.0050％，Ti：0.003％至0.030％，Mo：0.05％至1.00％，B：0.0003％至0.0100％，O：0.0001％至0.0080％，N：0.006％至0.0118％，P：限于0.050％ 以下，Al：0.008％以下，余量为Fe和不可避免的杂质，Ceq为0.30〜0.53，Pcm为0.10〜0.20，[N] - [Ti] /3.4小于0.003，平均粒径 钢板热影响区域中先前3个晶粒的尺寸为250μm以下，而先前的3个晶粒包括贝氏体和晶粒内贝氏体。

公开(公告)号：EP2036995A1

公开(公告)日：2009-03-18

申请号：EP07768340.7

申请日：2007-07-02

申请人： Nippon Steel Corporation

发明人： HARA, Takuya ,  ASAHI, Hitoshi ,  TERADA, Yoshio

IPC分类号： C22C38/00 ,  B23K35/30 ,  C21D8/02 ,  C21D8/10 ,  C21D9/08 ,  C21D9/50 ,  C22C38/14 ,  C22C38/58

CPC分类号： F16L9/02 ,  B23K35/30 ,  C21D8/02 ,  C21D8/10 ,  C21D9/08 ,  C22C38/002 ,  C22C38/005 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/16 ,  C22C38/20 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/38 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54 ,  C22C38/58

摘要： The present invention provides high strength steel pipe for line pipe superior in low temperature toughness suppressed in drop of toughness of the HAZ and a method of production of the same, more particularly high strength steel plate for line pipe used as a material for high strength steel pipe for line pipe and a method of production of the same, in particular high strength steel pipe for line pipe superior in low temperature toughness characterized in that the chemical compositions of the base metal is, by mass%, C: 0.020 to 0.080%, Si: 0.01 to 0.50%, Mo: 0.01 to 0.15%, Al: 0.0005 to 0.030%, and Nb: 0.0001 to 0.030% contained in a range of C+0.25Si+0.1Mo+Al+Nb: 0.100% or less and the mixture of austenite and martensite present along prior austenite grain boundaries of the reheated part of the heat affected zone has a width of 10 µm or less and a length of 50 µm or less.

公开(公告)号：EP1951519A2

公开(公告)日：2008-08-06

申请号：EP06846104.5

申请日：2006-10-17

申请人： ExxonMobil Upstream Research Company ,  Nippon Steel Corporation

发明人： BANGARU, Narasimha-rao, V. ,  KOO, Ja-young ,  JIN, Hyun-Woo ,  OZEKCIN, Adnan ,  FAIRCHILD, Douglas, P. ,  TERADA, Yoshio ,  ASAHI, Hitoshi ,  HARA, Takuya ,  SUGIYAMA, Masaaki

IPC分类号： B32B15/01

CPC分类号： C22C38/44 ,  B32B15/01 ,  C21D1/18 ,  C21D1/19 ,  C21D6/005 ,  C21D8/02 ,  C21D8/021 ,  C21D2211/002 ,  C21D2211/005 ,  C21D2211/008 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/58

摘要： A dual phase, high strength steel having a composite microstructure of soft and hard phases providing a low yield ratio, high strain capacity, superior weldability, and high toughness is provided. The dual phase steel includes from, about 10% by volume to about 60% by volume of a first phase or constituent consisting essentially of fine-grained ferrite. The first phase has a ferrite mean grain size of about 5 microns or less. The dual phase steel further includes from about 40% by volume to about 90% by volume of a second phase or constituent comprising fine-grained martensite, fine-grained lower bainite, fine-grained granular bainite, fine-grained degenerate upper bainite, or any mixture thereof. Methods for making the same are also provided.