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High-strength welded steel pipe excellent in hydrogen embrittlement cracking resistance of weld metal and process for producing the same

一种焊接金属、焊接钢管的技术，应用在制造工具、焊接设备、金属加工等方向，能够解决成本上升等问题

Inactive Publication Date: 2008-02-20
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the application of hydrogen capture sites is not necessarily a useful method for high-strength materials. In addition, the use of low-temperature phase-change melting materials will lead to a significant increase in cost

Method used

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  • High-strength welded steel pipe excellent in hydrogen embrittlement cracking resistance of weld metal and process for producing the same
  • High-strength welded steel pipe excellent in hydrogen embrittlement cracking resistance of weld metal and process for producing the same
  • High-strength welded steel pipe excellent in hydrogen embrittlement cracking resistance of weld metal and process for producing the same

Examples

Experimental program
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Effect test

Embodiment

[0066] The present invention will be described in detail below based on examples. In addition, here, φ represents a diameter, and t represents a wall thickness.

[0067] Table 1 shows the UOE forming process and roll bending of steel pipes with steel pipe sizes of φ711×13t, φ762×16t, φ914×16t, φ1118×19t, and φ1219×19t, with a steel pipe strength of 850-1100MPa and a steel pipe strength of 900-1050MPa. Examples and comparative examples when steel pipes are manufactured by machine (BR) forming process, and seam welding is performed in the order of inner surface and outer surface. In addition, the tensile strength in Table 1 is the result of cutting and measuring API full-thickness test pieces from the base material with the longitudinal direction as the circumferential direction.

[0068] The composition of the base material of the UOE steel pipe used in this example contains C: 0.08%, Si: 0.15%, Mn: 1.85%, P: 0.011%, S: 0.0003%, and Ni: 0.38% in mass % , Mo: 0.34%, Nb: 0.029%...

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Abstract

The present invention provides a high strength welded steel pipe superior in weld zone embrittlement crack characteristics and a method of production of the same, that is, a method of production of a welded steel pipe superior in hydrogen embrittlement cracking resistance of weld metal characterized by seam welding from the inner and outer surfaces by a tensile strength of 850 MPa or more, then expanding or reducing the size of the pipe for correction, which method of production of welded steel pipe characterized in that the hydrogen concentration of the preceding weld metal is 0.2 cc or less per 100 g at ordinary temperature.

Description

technical field [0001] The present invention relates to a high-strength welded steel pipe and its manufacturing method. The welded steel pipe is used for pipeline pipes for natural gas and crude oil transportation, etc., and the tensile strength in the circumferential direction of the base material and the weld metal formed by arc welding is 850 MPa or more . Background technique [0002] In recent years, for long-distance pipelines for transporting natural gas, from the perspective of improving the efficiency of transportation and reducing the cost of incidental equipment, studies have begun to lay high-strength and large-diameter pipelines with a tensile strength of 850 MPa or more. Such pipelines generally use the UOE method, the UOC method, the JOE method, or the roll bender method, and the steel plate is formed into a cylindrical shape, and the butt joints are seam-welded to produce the pipeline. In this case, submerged arc welding is used for the seam welded portion s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C37/08B23K9/025B23K9/18C21D3/06C21D9/08C21D9/50C22C38/00C22C38/58
CPCC22C38/46B23K2201/06C21D9/08C22C38/44B23K31/027C21D3/06C21D9/50B23K33/006B21C37/08C22C38/58C22C38/42B23K2101/06Y10T29/5185B23K9/02
Inventor 津留英司原卓也朝日均森本裕寺田好男吉田达哉品田功一
Owner NIPPON STEEL CORP
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