公开(公告)号：EP2832889A4

公开(公告)日：2015-08-19

申请号：EP13767351

申请日：2013-03-29

Applicant: JFE STEEL CORP

Inventor： SHIMAMURA JUNJI ,  NISHIMURA KIMIHIRO

IPC: C22C38/14 ,  B23K9/025 ,  B23K9/23 ,  C21D8/02 ,  C21D9/08 ,  C21D9/50 ,  C22C38/04 ,  C22C38/58

CPC classification number: F16L9/02 ,  B23K9/025 ,  B23K9/18 ,  B23K9/23 ,  B23K31/027 ,  B23K2201/06 ,  B23K2201/10 ,  C21D6/001 ,  C21D6/002 ,  C21D6/004 ,  C21D6/005 ,  C21D6/008 ,  C21D8/02 ,  C21D8/0226 ,  C21D8/0263 ,  C21D8/105 ,  C21D9/08 ,  C21D9/50 ,  C21D2211/002 ,  C21D2211/005 ,  C21D2211/008 ,  C22C38/001 ,  C22C38/002 ,  C22C38/004 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/18 ,  C22C38/26 ,  C22C38/28 ,  C22C38/38 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/58

Abstract: A steel plate having a low yield ratio and high strength excellent in terms of strain ageing resistance of an API 5L X70 grade or less, a method for manufacturing the steel plate and a high strength welded steel pipe made of the steel plate are provided. A high strength steel plate having a low yield ratio, the steel plate having a chemical composition containing, by mass%, C: 0.03% or more and 0.08% or less, Si: 0.01% or more and 1.0% or less, Mn: 1.2% or more and 3.0% or less, P: 0.015% or less, S: 0.005% or less, Al: 0.08% or less, Nb: 0.005% or more and 0.07% or less, Ti: 0.005% or more and 0.025% or less, N: 0.010% or less, O: 0.005% or less and the balance being Fe and inevitable impurities, a metallographic structure including a bainite phase and island martensite, and further including a polygonal ferrite in surface portions within 5 mm from the upper and lower surfaces, wherein the area fraction of the island martensite is 3% or more and 15% or less, wherein the equivalent circle diameter of the island martensite is 3.0 µm or less, wherein the area fraction of the polygonal ferrite in the surface portions is 10% or more and less than 80%, and wherein the remainder of the metallographic structure consists of a bainite phase, a hardness variation in the thickness direction of ”HV30 or less in terms of Vickers hardness, a hardness variation in the width direction of ”HV30 or less in terms of Vickers hardness, a maximum hardness in the surface portions of the steel plate of HV230 or less in terms of Vickers hardness and a yield ratio of 85% or less and an elongation of 22% or more in a full-thickness tensile test using a test piece having a shape in accordance with GOST standards.

公开(公告)号：EP2535629B1

公开(公告)日：2015-08-05

申请号：EP12183614.2

申请日：2007-12-13

Applicant: Saipem S.p.A.

Inventor： Cittadini Bellini, Serafino

IPC: F16L13/02 ,  F16L58/18 ,  B23K37/053

CPC classification number: F16L13/00 ,  B23K37/0533 ,  B23K2201/10 ,  B29C47/0021 ,  B29C47/021 ,  B29C47/028 ,  B29C47/0806 ,  B29C47/0866 ,  B29C47/126 ,  B29C47/92 ,  B29C2947/9258 ,  B29C2947/926 ,  B29C2947/92904 ,  F16L1/26 ,  F16L13/0272 ,  F16L58/181

公开(公告)号：EP2436472A4

公开(公告)日：2015-05-27

申请号：EP09845247

申请日：2009-09-04

Applicant: JFE STEEL CORP

Inventor： ISHIGAMI ATSUSHI ,  OI KENJI ,  HAYAKAWA NAOYA

IPC: B23K9/18 ,  B23K9/025 ,  B23K101/06

CPC classification number: B23K9/18 ,  B23K9/0253 ,  B23K33/006 ,  B23K2201/06 ,  B23K2201/10 ,  B23K2203/04

Abstract: Provided is a submerged arc welding method for a steel plate which is preferably used in making and welding a large diameter pipe such as a UOE steel pipe or a spiral steel pipe. As specific means, in welding the steel plate from an internal surface or an external surface by a submerged arc welding, welding condition is set such that, a cross-sectional area of internal weld metal S 1 and a cross-sectional area of external weld metal S 2 satisfy the formula (1), the formula (2), and the formula (3), that is, 0.40‰¤(S1+S2)/t 2 ‰¤0.80 ...... (1), S 1 /t 2 ‰¤0.35 ...... (2), and S 2 /t 2 ‰¤0.45 ...... (3), wherein t: a plate thickness of the steel plate (mm), S 1 : a cross-sectional area of the internal weld metal (mm 2 ) excluding the cross-sectional area of a portion of the internal weld metal overlapping with the external weld metal after external welding, and S 2 : a cross-sectional area of the external weld metal (mm 2 ).

公开(公告)号：EP2322312A4

公开(公告)日：2015-05-27

申请号：EP09770280

申请日：2009-06-22

Applicant: JFE STEEL CORP

Inventor： YANO KOJI ,  OI KENJI ,  SUZUKI MASAHITO ,  KODAMA TOSHIFUMI ,  SAKASHITA SHIGETO

IPC: B23K26/26 ,  B23K26/03 ,  B23K101/06

CPC classification number: B23K26/1429 ,  B23K26/03 ,  B23K26/032 ,  B23K26/262 ,  B23K2201/06 ,  B23K2201/10 ,  B23K2203/04

Abstract: There is provided a method for manufacturing a laser welded steel pipe in which the status of laser welding is accurately assessed, and the assessment is used to modify welding conditions, so that laser welded steel pipes can be manufactured at a high yield rate and in a stable manner. More specifically, irradiation point(s) of laser beam(s), with which the longitudinal edges are irradiated from the side of the outer surface, are monitored from the side of the inner surface of an open pipe, and then conditions of welding with the laser beam(s) are assessed to be kept unchanged if any keyhole is found penetrating out of the inner surface of the open pipe, or modified if no keyhole is found penetrating out of the inner surface of the open pipe, so that welding can be performed with any keyhole penetrating from the outer surface to the inner surface of the open pipe captured at any irradiation point of the laser beam(s) .

公开(公告)号：EP2764946A1

公开(公告)日：2014-08-13

申请号：EP12838033.4

申请日：2012-10-03

Applicant: JFE Steel Corporation

Inventor： TANIZAWA, Akihiko ,  OTA, Yoshiaki ,  UCHITOMI, Noriaki ,  OKATSU, Mitsuhiro ,  NISHIMURA, Kimihiro

IPC: B23K9/025 ,  B21C37/08 ,  B23K9/18 ,  B23K9/23 ,  C22C38/00 ,  C22C38/58 ,  B23K101/06 ,  B23K103/04

CPC classification number: F16L9/02 ,  B23K9/0253 ,  B23K9/0282 ,  B23K9/18 ,  B23K33/006 ,  B23K2201/10 ,  B23K2203/04 ,  C21D8/10 ,  C21D8/105 ,  C21D9/50 ,  C21D2211/001 ,  C21D2211/008 ,  C22C38/001 ,  C22C38/002 ,  C22C38/005 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/18 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/58 ,  Y10T428/12292

Abstract: It is an object to provide a welded steel pipe which is excellent in productivity and which has excellent welded heat-affected zone toughness without deteriorating the internal quality of welds.
A welded steel pipe with excellent welded heat-affected zone toughness includes a butt weld formed by prior welding either an inner surface or an outer surface with a single layer for each of the inner and outer surfaces, wherein in the metallographic structure of a welded heat-affected zone, the martensite-austenite constituent (MA) area fraction is 4% or less, the average prior-austenite grain size is 400 µm or less, and the following items are taken into account: the average prior-austenite grain size of a welded heat-affected zone formed by prior welding, the average prior-austenite grain size of a welded heat-affected zone formed by subsequent welding, the bead width determined at a position 5 mm apart from the tip of a weld bead formed by subsequent welding, the fusion line tilt angle of a weld bead of prior welding, and the fusion line tilt angle of a weld bead of subsequent welding.

公开(公告)号：EP2687311A1

公开(公告)日：2014-01-22

申请号：EP12760688.7

申请日：2012-01-27

Applicant: Mitsubishi Heavy Industries, Ltd.

Inventor： KAWASAKI, Kenji ,  TOYODA, Masahiko ,  KANASAKI, Hiroshi ,  INOUE, Tomoyuki ,  HIRO, Takafumi ,  KAWAGUCHI, Seiichi ,  KITAMURA, Kosuke ,  OTA, Tomohisa ,  NAKAJIMA, Nobutaka

IPC: B23K9/23 ,  B23K9/00 ,  B23K9/04 ,  B23K31/00 ,  B23K103/18

CPC classification number: B23K9/042 ,  B23K9/0026 ,  B23K9/046 ,  B23K9/232 ,  B23K2201/10 ,  B23K2201/12 ,  B23K2203/04 ,  B23K2203/05 ,  B23K2203/18 ,  B23K2203/26 ,  B32B15/015 ,  Y10T428/12937

Abstract: A welding structure (30A) includes a welding layer (60A) which is configured of a first built-up layer (33) which is formed of low-alloy steel or carbon steel having a carbon content of less than low-alloy steel and which is formed on a base metal (31), a second built-up layer (34) which is formed of a 600-type nickel-based alloy and which is formed on the first built-up layer (33) and a third built-up layer (35) which is formed of a 690-type nickel-based alloy and which is formed on the second built-up layer (34).

Abstract translation: 一种焊接结构（30A）包括由第一组合层（33）构成的焊接层（60A），所述第一组合层由碳含量低于低合金钢的低合金钢或碳钢形成，并且其 形成于基底金属31上;第二积层34，其由600型镍基合金形成并形成在第一积层33上;第二积层34， （35），其由形成在第二积层（34）上的690型镍基合金形成。

公开(公告)号：EP2664686A1

公开(公告)日：2013-11-20

申请号：EP13163031.1

申请日：2013-04-10

Applicant: Hitachi Ltd.

Inventor： IMANO, Shinya ,  DOI, Hiroyuki ,  SATO, Jun

IPC: C22C19/05 ,  C22F1/10 ,  F22B37/10

CPC classification number: F22B37/04 ,  B23K9/0282 ,  B23K9/167 ,  B23K9/23 ,  B23K31/027 ,  B23K35/0261 ,  B23K35/3033 ,  B23K35/304 ,  B23K35/40 ,  B23K2201/06 ,  B23K2201/10 ,  B23K2203/08 ,  B23K2203/26 ,  B32B1/08 ,  B32B15/01 ,  B32B15/043 ,  C21D6/001 ,  C21D6/02 ,  C21D8/10 ,  C21D9/08 ,  C21D2251/04 ,  C22C19/03 ,  C22C19/05 ,  C22C19/051 ,  C22C19/055 ,  C22C19/056 ,  C22F1/10 ,  F16L9/02 ,  F16L13/02 ,  F22B37/10 ,  Y10T428/12931 ,  Y10T428/12944 ,  Y10T428/13

Abstract: A high-temperature piping product is configured from a plurality of primary pipe members and a welding material. The primary pipe members are each made from an Ni-based forged alloy containing: Ni, Al, and at least one of Mo and W, the total content of the Mo and the W being 3-8 mass%, the Ni-based forged alloy exhibiting a γ'-phase dissolution temperature of from 920 to 970°C, and the γ' phase being precipitated in 30 volume% or more in a temperature range of from 700 to 800°C. The welding material is made from an Ni-based cast alloy having a cast structure formed by welding, the Ni-based cast alloy containing: Ni, Al, and at least one of Mo and W, the total content of the Mo and the W being 9-15 mass%, the Ni-based cast alloy exhibiting a γ'-phase dissolution temperature of from 850 to 900°C, the γ' phase being precipitated in 20 volume% or more in a temperature range of from 700 to 800°C. The welding material is buttered to the primary pipe members in portions to be welded to each other.

Abstract translation: 高温管道产品由多个主管件和焊接材料构成。 主要管件均由Ni，Al和Mo和W中的至少一种的Ni基锻造合金制成，Mo和W的总含量为3-8质量％，Ni基锻造 合金表现出920〜970℃的3相溶解温度，在700〜800℃的温度范围内，3相析出为30体积％以上。 焊接材料由具有通过焊接形成的铸造结构的Ni基铸造合金制成，Ni基铸造合金含有Ni，Al，Mo和W中的至少一种，Mo和W的总含量 为9〜15质量％，Ni系铸造合金的3相溶解温度为850〜900℃，3相在700〜800℃的温度范围内析出为20体积％以上 C。 焊接材料以相互焊接的部分焊接到主管部件上。

公开(公告)号：EP2634271A1

公开(公告)日：2013-09-04

申请号：EP12773882.1

申请日：2012-02-03

Applicant: Nippon Steel & Sumitomo Metal Corporation

Inventor： SAWAMURA, Mitsuru ,  ASAHI, Hitoshi

IPC: C21D8/02 ,  B21B3/00 ,  B21C37/08 ,  C22C38/00 ,  C22C38/14 ,  C22C38/58

CPC classification number: B23K11/00 ,  B21C37/08 ,  B23K11/002 ,  B23K11/0073 ,  B23K2201/06 ,  B23K2201/10 ,  B23K2203/04 ,  C21D1/18 ,  C21D1/25 ,  C21D8/0226 ,  C21D8/0263 ,  C21D8/105 ,  C21D9/08 ,  C22C38/001 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/14 ,  F16L9/00 ,  F16L13/02

Abstract: [Object] There are provided electric resistance welded oil country tubular goods having strength corresponding to API specification 5CT P110 without a heat treatment being performed on the whole steel pipe and further having excellent toughness, and a manufacturing method of an electric resistance welded oil country tubular goods.
[Solution] Electric resistance welded oil country tubular goods according to the present invention have a chemical composition that contains, in mass%, C: 0.05 to 0.12%, Si: 0.03 to 0.5%, Mn: 0.80 to 2.2%, P: 0.03% or less, S: 0.003% or less, Al: 0.08% or less, Nb: 0.01% to 0.10%, Ti: 0.005 to 0.03%, B: 0.0005 to 0.0030%, and N: 0.008% or less, and in which Ti > 3.4 N is satisfied, its balance is composed of Fe and inevitable impurities, and, V C90 is 15 to 40.

Abstract translation: 本发明提供一种电阻焊油井管材和电阻焊油井管的制造方法，所述电阻焊油井管具有对应于API规格5CT P110的强度，而不对钢管整体进行热处理并且具有优异的韧性， 产品。 根据本发明的电阻焊油井管材的化学组成以质量％计含有C：0.05〜0.12％，Si：0.03〜0.5％，Mn：0.80〜2.2％，P：0.03 S：0.003％以下，Al：0.08％以下，Nb：0.01〜0.10％，Ti：0.005〜0.03％，B：0.0005〜0.0030％，N：0.008％以下， 其中，Ti> 3.4N，其余量由Fe和不可避免的杂质构成，VC90为15〜40。

公开(公告)号：EP2289662A3

公开(公告)日：2012-12-05

申请号：EP10014805.5

申请日：2003-09-05

Applicant: SUMITOMO METAL INDUSTRIES, LTD.

Inventor： Amaya, Hisashi ,  Oagawa, Kazuhiro ,  Kondo, Kunio ,  Sagara, Masayuki ,  Hirata, Hiroyuki

IPC: B23K35/30 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/40 ,  C22C38/42 ,  C22C38/44 ,  B23K9/028 ,  B23K9/16 ,  B23K9/23 ,  C21D9/50 ,  C22C38/00

CPC classification number: B23K9/0286 ,  B23K9/16 ,  B23K9/23 ,  B23K35/3086 ,  B23K2201/10 ,  B23K2203/05 ,  C21D9/50 ,  C22C38/004 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/40 ,  C22C38/42 ,  C22C38/44 ,  Y10T428/12611 ,  Y10T428/12979 ,  Y10T428/13

Abstract: This invention relates to a welded line pipe structure for transporting corrosive petroleum or natural gas. It is constituted by martensitic stainless steel pipes containing 8 - 16% Cr and at most 0.05% C. By suitably controlling the welding conditions at the time of girth welding of the steel pipes so as to ensure that the Cr concentration in grain boundary Cr-depleted portions existing immediately beneath a weld oxide scale is at least 5%, the occurrence of SCC in a high temperature CO 2 environment can be prevented.

公开(公告)号：EP2507006A1

公开(公告)日：2012-10-10

申请号：EP10788387.8

申请日：2010-11-30

Applicant: Saipem S.p.A.

Inventor： BOWERS, Jonathan

IPC: B23K9/028 ,  B23K9/167 ,  B23K9/173 ,  B23K37/02 ,  F16L1/12 ,  C21D9/08 ,  C21D9/50

CPC classification number: B23K9/0284 ,  B23K9/0213 ,  B23K9/0286 ,  B23K9/167 ,  B23K9/1735 ,  B23K10/02 ,  B23K37/0276 ,  B23K2201/10 ,  C21D9/50 ,  F16L13/02

Abstract: A method of laying a pipeline is described in which both internal and external weld passes are performed in order to weld together the pipe sections (2a, 2b). The method includes arranging a pipe section (2b) adjacent to the end (2a) of a pipeline thereby defining a circumferential joint (8) to be welded, performing an external weld pass with, for example GMAW - MIG torch (10), on the root of the joint (8) to be welded during which weld material is deposited in the root of the joint to be welded, thereby forming a root weld (4r), and then performing an internal weld pass with, for example a GTAW - TIG torch (12), on the root weld (4r) during which the root weld (4r) is melted and re-shaped. The method has particular application in relation to pipes clad with corrosion resistant alloy (CRA) (6).

Abstract translation: 铺设管道的方法，描述了其中内部和外部焊接道次以将管段焊接在一起进行。 该方法包括布置管部邻近于管道从而限定一个周向接合的端部被焊接，在执行外部的焊道，与对于实施例GMAW MIG焊炬，在接头的根部哪种焊接材料中要被焊接 在接头的根部沉积被焊接，由此形成根部焊缝，然后在内部焊接道哪个期间执行，与实施例一GTAW TIG焊炬，在根部焊缝根部焊缝熔化和重新成形 ， 该方法具有相对于与耐蚀合金复合管的特定应用。