公开(公告)号：EP2728030A4

公开(公告)日：2015-09-02

申请号：EP12805050

申请日：2012-06-29

申请人： JFE STEEL CORP

发明人： ISHIGURO YASUHIDE ,  KIMURA MITSUO ,  EGUCHI KENICHIRO ,  YOKOGAWA HIROSHI ,  KATAGIRI TADAO ,  TANAKA MASAHITO

IPC分类号： C22C38/00 ,  C21D1/18 ,  C21D3/04 ,  C21D9/08 ,  C22C38/14 ,  C22C38/58

CPC分类号： C21D9/085 ,  C21D1/25 ,  C21D1/63 ,  C21D8/105 ,  C21D2261/00 ,  C22C38/001 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/14 ,  C22C38/20 ,  C22C38/22 ,  C22C38/24 ,  C22C38/28 ,  C22C38/38 ,  C22C38/40 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/58 ,  F16L9/02

摘要： A heavy wall and high strength seamless steel pipe having high sour resistance is provided. In particular, a quenching and tempering treatment is conducted to adjust the yield strength to be higher than 450 MPa and adjust the wickers hardness HV5 that can be measured at an outermost side or an innermost side of the pipe under a 5 kgf load (test load: 49 N) to be 250 HV5 or less. In order to achieve this, surface layers are ground from surfaces by a depth of 0.3 mm or more in a wall thickness direction after the quenching treatment, or the quenching treatment is designed to include holding a heating temperature equal to or higher than the Ac3 transformation point for 120 seconds or more in an air atmosphere and then performing water-cooling in a nucleate boiling region or performing water-cooling in a film boiling region and then in a nucleate boiling region. As a result of this quenching treatment, the hardness of the surface layers decreases to 250 HV5 or less and a steel pipe that has an M-shape hardness distribution in which the maximum hardness appears at some point in the profile other than the center of the wall or a U-shape hardness distribution in which the hardness of the surface layers is the highest but not more than 250 HV5 or a flat shape hardness distribution can be obtained. As a result, the sour resistance is significantly improved.

公开(公告)号：EP1284167A4

公开(公告)日：2005-11-09

申请号：EP02705439

申请日：2002-03-22

申请人： JFE STEEL CORP

发明人： TOYOOKA TAKAAKI ,  MIYATA YUKIO ,  KIMURA MITSUO ,  ITOYAMA SEIJI ,  KISHIMOTO YASUO ,  NISHIKOORI MASANORI ,  TAWARA EIJI ,  OZAKI SEIJI

IPC分类号： B22D11/22 ,  B21B19/04 ,  B21B19/06 ,  B22D11/00 ,  B22D11/124 ,  B22D11/12

CPC分类号： B22D11/00 ,  B21B19/04 ,  B21B19/06 ,  B22D11/124

摘要： A method for manufacturing a seamless steel pipe which is excellent in properties of its inner surface and its wall. A round billet having a center segregation zone parting degree W (%) of 20 % or more, defined by the following formula, is used as its material. W (%) = ( DELTA w/D) x 100 (wherein W is the center segregation band parting degree (%), DELTA w is the center segregation zone parting width (mm) at the thickness center of the round billet, and D is the external diameter (mm) of the round billet). The round billet is pierced into a hollow blank pipe while maintaining the temperature at a predetermined temperature, and is then formed into a steel pipe of a predetermined size by elongating or by elongating and drawing the blank pipe. The continuously cast slab is preferably a slab cast by using a molten steel the overheat temperature of which is 25 to 65 DEG C, using secondary cooling water is such a way that the amount of secondary cooling water at the central portion of the slab width is greater than that at the peripheral portion in the slab width direction, and that the ratio of the secondary cooling water till the complete solidification is 1.2 to 2.0 l/kg-steel.

公开(公告)号：EP2172573A4

公开(公告)日：2011-05-18

申请号：EP07829943

申请日：2007-10-10

申请人： JFE STEEL CORP

发明人： MIYATA YUKIO ,  KIMURA MITSUO ,  TANAKA MASAHITO ,  SHIMAMOTO KEN

IPC分类号： C22C38/00 ,  B21D3/00 ,  C21D9/08 ,  C22C38/02 ,  C22C38/58

CPC分类号： C21D9/14 ,  C21D1/22 ,  C21D6/004 ,  C21D8/105 ,  C21D9/08 ,  C21D2211/008 ,  C22C38/004 ,  C22C38/02 ,  C22C38/04 ,  C22C38/40 ,  C22C38/58

公开(公告)号：EP1514950A4

公开(公告)日：2005-07-20

申请号：EP03733478

申请日：2003-06-18

申请人： JFE STEEL CORP

发明人： KIMURA MITSUO ,  TAMARI TAKANORI ,  TOYOOKA TAKAAKI

IPC分类号： B21C37/08 ,  C21D9/08 ,  C22C38/00 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50

CPC分类号： C21D6/004 ,  B21C37/08 ,  C21D9/14 ,  C21D2211/008 ,  C22C38/001 ,  C22C38/002 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50

摘要： A stainless-steel pipe with excellent corrosion resistance for oil wells, characterized by having a composition which comprises, in terms of wt.%, up to 0.05% carbon, up to 0.5% silicon, 0.20 to 1.80% manganese, up to 0.03% phosphorus, up to 0.005% sulfur, 14.0 to 18.0% chromium, 5.0 to 8.0% nickel, 1.5 to 3.5% molybdenum, 0.5 to 3.5% copper, up to 0.05% aluminum, up to 0.20% vanadium, 0.01 to 0.15% nitrogen, up to 0.006% oxygen, and iron and unavoidable impurities as the remainder, provided that Cr+0.65Ni+0.6Mo+0.55Cu-20C≥18.5 and Cr+Mo+0.3Si-43.5C-0.4Mn-Ni-0.3Cu-9N≤11 (wherein Cr, Ni, Mo, Cu, C, Si, Mn, and N mean the contents of the respective elements (wt.%)).

摘要翻译： 1，一种对油井具有优异耐腐蚀性的不锈钢管，其特征在于其组成按重量百分比计包含至多0.05％的碳，至多0.5％的硅，0.20至1.80％的锰，至多0.03％ 磷，高达0.005％的硫，14.0-18.0％的铬，5.0-8.0％的镍，1.5-3.5％的钼，0.5-3.5％的铜，至多0.05％的铝，至多0.20％的钒，0.01-0.15％的氮， 如果Cr + 0.65Ni + 0.6Mo + 0.55Cu-20C≥18.5且Cr + Mo + 0.3Si-43.5C-0.4Mn-Ni-0.3Cu-20C≥18.5，则氧含量高达0.006％，余量为铁和不可避免的杂质。 9N≤11（其中Cr，Ni，Mo，Cu，C，Si，Mn和N是指各元素的含量（重量％））。

公开(公告)号：EP3272893A4

公开(公告)日：2018-01-24

申请号：EP16764427

申请日：2016-03-07

申请人： JFE STEEL CORP

发明人： TAKAGI SHUSAKU ,  NAGAO AKIHIDE ,  KIMURA MITSUO ,  OKANO HIROSHI

IPC分类号： C22C38/00 ,  C21D8/10 ,  C21D9/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/18 ,  C22C38/58 ,  F17C1/00

CPC分类号： C21D8/10 ,  C21D9/00 ,  C21D2211/002 ,  C21D2211/008 ,  C22C38/00 ,  C22C38/001 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/18 ,  C22C38/58 ,  F17C1/00 ,  Y02E60/321

摘要： Steel material for composite pressure vessel liners that, when used as raw material for manufacturing a composite pressure vessel liner, yields a liner having sufficient strength and a high fatigue limit and enables the manufacture of an inexpensive composite pressure vessel is provided. Steel material for composite pressure vessel liners comprises: a chemical composition containing, in mass%, C: 0.10% to 0.60%, Si: 0.01% to 2.0%, Mn: 0.1% to 5.0%, P: 0.0005% to 0.060%, S: 0.0001% to 0.010%, N: 0.0001% to 0.010%, and Al: 0.01% to 0.06%, with a balance being Fe and incidental impurities; and a metallic microstructure in which a mean grain size of prior austenite grains is 20 µm or less, and a total area ratio of martensite and lower bainite is 90% or more.

公开(公告)号：EP2447386A4

公开(公告)日：2016-06-15

申请号：EP10792232

申请日：2010-06-23

申请人： JFE STEEL CORP

发明人： EGUCHI KENICHIRO ,  TANAKA YUJI ,  KIMURA MITSUO ,  ISHIGURO YASUHIDE ,  YAMADA KATSUMI ,  NAKAMICHI HARUO

IPC分类号： C22C38/00 ,  C21D9/08 ,  C21D9/14 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/20 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54

CPC分类号： C21D9/14 ,  C21D2211/004 ,  C21D2211/008 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/20 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54

摘要： Provided is a high-strength seamless steel tube, having excellent resistance to sulfide stress cracking (SSC resistance), for oil wells. In particular, the seamless steel tube contains 0.15% to 0.50% C, 0.1% to 1.0% Si, 0.3% to 1.0% Mn, 0.015% or less P, 0.005% or less S, 0.01% to 0.1% Al, 0.01% or less N, 0.1% to 1.7% Cr, 0.4% to 1.1% Mo, 0.01% to 0.12% V, 0.01% to 0.08% Nb, and 0.0005% to 0.003% B or further contains 0.03% to 1.0% Cu on a mass basis and has a microstructure which has a composition containing 0.40% or more solute Mo and a tempered martensite phase that is a main phase and which contains prior-austenite grains with a grain size number of 8.5 or more and 0.06% by mass or more of a dispersed M 2 C-type precipitate with substantially a particulate shape.

公开(公告)号：EP2990714A4

公开(公告)日：2016-04-13

申请号：EP14788687

申请日：2014-04-24

申请人： JFE STEEL CORP ,  JFE CONTAINER CO LTD

发明人： TAKAGI SHUSAKU ,  NAGAO AKIHIDE ,  KIMURA MITSUO ,  ISHIKAWA NOBUYUKI ,  TAKANO TOSHIO

IPC分类号： F17C1/06

CPC分类号： F17C1/06 ,  F17C1/00 ,  F17C2201/058 ,  F17C2203/0604 ,  F17C2203/0621 ,  F17C2203/0639 ,  F17C2203/0648 ,  F17C2203/066 ,  F17C2203/0663 ,  F17C2203/0675 ,  F17C2209/2154 ,  F17C2209/2163 ,  F17C2209/225 ,  F17C2221/012 ,  F17C2223/0123 ,  F17C2223/036 ,  F17C2260/011 ,  F17C2260/012 ,  F17C2270/0168 ,  F17C2270/0184 ,  Y02E60/321

摘要： To provide an inexpensive hydrogen storage tank while the safety is ensured. A hydrogen storage tank 10 includes a liner layer 12 to store hydrogen and a carbon fiber reinforced plastic layer 14 disposed outside the liner layer 12. The liner layer 12 is formed from a low-alloy steel, and the carbon fiber forming the carbon fiber reinforced plastic layer 14 is a pitch based carbon fiber.

公开(公告)号：EP2843068A4

公开(公告)日：2015-08-05

申请号：EP12875045

申请日：2012-04-26

申请人： JFE STEEL CORP

发明人： MIYATA YUKIO ,  KIMURA MITSUO

IPC分类号： C22C38/00 ,  C22C38/58

CPC分类号： C22C38/58 ,  C21D6/004 ,  C21D8/0226 ,  C21D8/0263 ,  C21D9/50 ,  C22C38/001 ,  C22C38/002 ,  C22C38/004 ,  C22C38/005 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50

公开(公告)号：EP2865777A4

公开(公告)日：2015-11-11

申请号：EP13807143

申请日：2013-06-19

申请人： JFE STEEL CORP

发明人： EGUCHI KENICHIRO ,  ISHIGURO YASUHIDE ,  MIYATA YUKIO ,  KIMURA MITSUO

IPC分类号： C22C38/00 ,  C21D6/00 ,  C21D9/08 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54

CPC分类号： C22C38/54 ,  C21D6/004 ,  C21D6/005 ,  C21D6/008 ,  C21D9/08 ,  C21D9/085 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/005 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50

摘要： Chemical composition contains, by mass%, C: 0.05% or less, Si: 0.5% or less, Mn: 0.15% or more and 1.0% or less, Cr: 13.5% or more and 15.4% or less, Ni: 3.5% or more and 6.0% or less, Mo: 1.5% or more and 5.0% or less, Cu: 3.5% or less, W: 2.5% or less, and N: 0.15% or less so that the relationship -5.9 x (7.82 + 27C - 0.91Si + 0.21Mn - 0.9Cr + Ni - 1.1Mo - 0.55W + 0.2Cu + 11N) ‰¥ 13.0 is satisfied. By this method, it is possible to manufacture a high strength stainless steel seamless pipe having excellent resistance to sulfide stress cracking equivalent to that of a steel having a chemical composition containing about 17% of Cr even with a chemical composition having comparatively low Cr content of about 15 mass%. In addition, V: 0.02% or more and 0.12% or less and/or Al: 0.10% or less and/or one or more selected from among Nb: 0.02% or more and 0.50% or less, Ti: 0.02% or more and 0.16% or less, Zr: 0.50% or less, and B: 0.0030% or less and/or one or more selected from among REM: 0.005% or less, Ca: 0.005% or less, and Sn: 0.20% or less may be further contained.

公开(公告)号：EP1876253A4

公开(公告)日：2010-07-28

申请号：EP06728594

申请日：2006-02-24

申请人： JFE STEEL CORP

发明人： KIMURA MITSUO ,  YAMAZAKI YOSHIO ,  TANAKA MASAHITO

IPC分类号： C22C38/00

CPC分类号： C22C38/002 ,  C21D6/004 ,  C21D8/10 ,  C21D9/08 ,  C22C38/001 ,  C22C38/02 ,  C22C38/04 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46