公开(公告)号：US10196702B2

公开(公告)日：2019-02-05

申请号：US15023564

申请日：2014-12-11

申请人： NIPPON STEEL & SUMITOMO METAL CORPORATION

发明人： Takaaki Fukushi ,  Hideki Hamatani ,  Masakazu Ozaki ,  Yuusuke Ichinose

IPC分类号： C22C38/02 ,  C22C38/04 ,  C22C38/14 ,  C22C38/12 ,  C22C38/06 ,  C21D9/08 ,  B23K11/00 ,  B23K13/00 ,  B23K11/08 ,  C21D8/10 ,  C21D9/50 ,  C22C38/00 ,  C22C38/58 ,  B23K11/087 ,  C22C38/08 ,  C22C38/20 ,  C22C38/24 ,  C22C38/28 ,  C22C38/42 ,  C22C38/44 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54 ,  C22C38/60 ,  B23K101/10 ,  B23K103/04 ,  B21C37/08

摘要： An electric resistance welded steel pipe for an oil well includes in terms of mass %: 0.02 to 0.14% of C, 0.05 to 0.50% of Si, 1.0 to 2.1% of Mn, 0.020% or less of P, 0.010% or less of S, 0.010 to 0.100% of Nb, 0.010 to 0.050% of Ti, 0.010 to 0.100% of Al, and 0.0100% or less of N. Contents of Cu, Ni, Cr, Mo, V, and B are 0 to 0.50%, 0 to 1.00%, 0 to 0.50%, 0 to 0.30%, 0 to 0.10%, and 0 to 0.0030%, respectively. Remainder consisting of Fe and unavoidable impurities. In a case that a full thickness specimen is subjected to a pipe axis direction tensile test, a tensile strength is 780 MPa or more, 0.2% proof stress/tensile strength is 0.80 or more, and 2% flow stress/tensile strength is from 0.85 to 0.98.

公开(公告)号：US10738366B2

公开(公告)日：2020-08-11

申请号：US15022004

申请日：2013-12-20

申请人： NIPPON STEEL & SUMITOMO METAL CORPORATION

发明人： Hideki Hamatani ,  Keinosuke Iguchi ,  Masakazu Ozaki ,  Takaaki Fukushi ,  Takuya Asano

IPC分类号： C22C38/58 ,  C22C38/48 ,  C22C38/50 ,  C22C38/14 ,  C22C38/38 ,  C22C38/12 ,  C21D8/10 ,  C21D9/08 ,  C21D8/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/26 ,  C21D8/04 ,  C22C38/16 ,  C22C38/28 ,  C22C38/08 ,  C22C38/06 ,  F16L9/17 ,  C21D9/50 ,  B23K35/30

摘要： The present invention provides electric-resistance welded steel pipe optimal for applications such as production of shale gas which is comprised of steel having a chemical composition which contains, by mass %, respectively, C: 0.08 to 0.18%, Si: 0.01% to 0.50%, Mn: 1.30 to 2.1%, Al: 0.001 to 0.10%, Nb: 0.005 to 0.08%, and Ti: 0.005 to 0.03%, is limited to N 0.008% or less, P: 0.020% or less, and S: 0.010% or less, and has a balance of Fe and unavoidable impurities, wherein a structure at a center part of thickness is 40% to 70% by area of ferrite phase having a circle-equivalent diameter of 1.0 μm to 10.0 μm and a balance of a low temperature transformation phase comprising a bainite phase, and Ceq satisfies 0.32≤Ceq≤0.60.

公开(公告)号：US09726305B2

公开(公告)日：2017-08-08

申请号：US14420971

申请日：2013-09-27

申请人： NIPPON STEEL & SUMITOMO METAL CORPORATION

发明人： Yasuhiro Shinohara ,  Kensuke Nagai ,  Masakazu Ozaki

IPC分类号： C22C38/04 ,  C22C38/14 ,  C22C38/12 ,  C22C38/02 ,  C21D8/10 ,  C21D9/14 ,  F16L9/02 ,  C22C38/00 ,  C22C38/06 ,  C22C38/08 ,  C22C38/16 ,  C22C38/18 ,  B23K35/38 ,  B23K11/087 ,  C21D9/50 ,  B23K11/00 ,  C22C38/26 ,  C22C38/28 ,  C21D9/46

CPC分类号： F16L9/02 ,  B23K11/002 ,  B23K11/0873 ,  B23K35/38 ,  C21D9/46 ,  C21D9/50 ,  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 ,  C22C38/18 ,  C22C38/26 ,  C22C38/28 ,  Y10T428/12292

摘要： An electric resistance welded steel pipe which has sufficient strength and low-temperature toughness and a low yield ratio and which is suitable as a line pipe to be laid in depths of the sea, characterized in that: the composition of the base material contains, in mass %, 0.05 to 0.10% of C, 1.00 to 1.60% of Mn, and 0.005 to less than 0.035% of Nb, and has a Ceq value of 0.23 to 0.38; and the metal microstructure of the base material contains 3 to 13% of martensite in area fraction with the balance being ferrite.

公开(公告)号：US20150219249A1

公开(公告)日：2015-08-06

申请号：US14420971

申请日：2013-09-27

申请人： NIPPON STEEL & SUMITOMO METAL CORPORATION

发明人： Yasuhiro Shinohara ,  Kensuke Nagai ,  Masakazu Ozaki

IPC分类号： F16L9/02 ,  C22C38/26 ,  C22C38/16 ,  C22C38/14 ,  B23K11/00 ,  C22C38/08 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C22C38/28 ,  C22C38/12

CPC分类号： F16L9/02 ,  B23K11/002 ,  B23K11/0873 ,  B23K35/38 ,  C21D9/46 ,  C21D9/50 ,  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 ,  C22C38/18 ,  C22C38/26 ,  C22C38/28 ,  Y10T428/12292

摘要： An electric resistance welded steel pipe which has sufficient strength and low-temperature toughness and a low yield ratio and which is suitable as a line pipe to be laid in depths of the sea, characterized in that: the composition of the base material contains, in mass %, 0.05 to 0.10% of C, 1.00 to 1.60% of Mn, and 0.005 to less than 0.035% of Nb, and has a Ceq value of 0.23 to 0.38; and the metal microstructure of the base material contains 3 to 13% of martensite in area fraction with the balance being ferrite.

摘要翻译： 一种电阻焊钢管，其具有足够的强度和低温韧性和低屈服比，并且适合作为放置在海洋深处的管线管，其特征在于：所述基材的组成包含在 质量％，C：0.05〜0.10％，Mn：1.00〜1.60％，Nb：0.005〜小于0.035％，Ceq值：0.23〜0.38。 基体材料的金属组织含有3〜13％的马氏体，平均为铁素体。