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Apparatus for manufacturing seam-welded pipe excelling in welded portion characteristic

A technology of resistance welding and manufacturing equipment, which is applied in the direction of high-frequency current welding equipment, welding equipment, manufacturing tools, etc., to achieve the effect of reducing manufacturing efficiency

Active Publication Date: 2008-11-05
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, as in Patent Document 3, the strip is extremely difficult to be work-hardened by the reduction of the lateral edges by the vertical rolls, and even if the amount of upset is reduced in the subsequent fin forming, the strip will subsequently be hardened. The fin part is filled, so it is difficult to shape the lateral edge of the strip 20 as described in Patent Document 4

Method used

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  • Apparatus for manufacturing seam-welded pipe excelling in welded portion characteristic
  • Apparatus for manufacturing seam-welded pipe excelling in welded portion characteristic
  • Apparatus for manufacturing seam-welded pipe excelling in welded portion characteristic

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0094] A steel pipe with a diameter of 600mm is manufactured using a strip (steel strip) with a width of 1920mm and a thickness of 19.1mm, and then a strip (steel strip) with a width of 1920mm and a thickness of 11.3mm is used to manufacture a resistance welded pipe with a diameter of 600mm.

[0095] A test piece was cut from the welded portion of the manufactured electric resistance welded pipe, and the test piece was subjected to a Charpy test to evaluate the performance of the pipe. A Charpy test piece is sampled at each of ten different points along the length of the tube in such a way that the longitudinal direction of the test piece is parallel to the circumferential direction of the tube and the longitudinal center of the notch corresponds to the welded portion. The center position on the thickness. The test piece was shaped into a JIS5 2mm-V-notch impact test piece, impact tested at -46°C, and the Charpy impact value and brittle fracture surface ratio were measured. A...

Embodiment 2

[0105] A steel pipe with a diameter of 600 mm was manufactured using a strip (steel strip) with a width of 1920 mm and a thickness of 19.1 mm. A test piece was cut from the welded portion of the manufactured electric resistance welded pipe, and the test piece was subjected to a Charpy test to evaluate the performance of the pipe. A Charpy test piece is sampled at each of ten different points along the length of the tube in such a way that the longitudinal direction of the test piece is parallel to the circumferential direction of the tube and the longitudinal center of the notch corresponds to the welded portion. The center position on the thickness. The test piece was shaped into a JIS5 2mm-V-notch impact test piece, impact tested at -46°C, and the Charpy impact value and brittle fracture surface ratio were measured. A Charpy impact value of 125J or more and a brittle fracture surface ratio of 35% or less were designated as allowable performance ranges, respectively.

[010...

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PUM

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Abstract

The invention provides an apparatus for manufacturing an electric resistance welded pipe, which is capable of ensuring good weld quality through imparting of an appropriate taper configuration to a transverse edge of band plate prior to electric resistance welding for an electric resistance welded pipe. There is provided an apparatus for manufacturing an electric resistance welded steel pipe, satisfying at least either the requirement (1) of disposing cutting or grinding means (3) posterior to leveler (2) or the requirement (2) of disposing at least one fin pass forming stand (4) fitted with a fin having at least two stages of taper configuration.

Description

technical field [0001] The present invention relates to a manufacturing apparatus for a pipe requiring weld toughness such as a line pipe for an oil well or a pipe requiring weld strength such as a casing for an oil well. Background technique [0002] In general, pipes can be broadly classified into welded pipes and seamless pipes. An electric resistance welded pipe, which is a type of welded pipe, is manufactured by bending a sheet into a circle by roll forming or the like, and then butting the edges and welding them. In welded pipe, the weld is generally less tough and strong than the parent strip. Therefore, in the use of pipes, there is an inevitable problem of securing certain toughness and strength for each application. [0003] For example, because pipelines used to transport crude oil or natural gas are usually laid in cooler regions, toughness at low temperatures is a major consideration. Furthermore, strength is an important consideration for casing used to prot...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C37/083B23K13/00
Inventor 剑持一仁冈部能知横山泰康城泽广幸泽木哲郎杉本祐二井上智弘小出龙男
Owner JFE STEEL CORP
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