| 摘要 |
PROBLEM TO BE SOLVED: To provide a method with which horizontal cracks caused by hydrogen produced in the seam weld zone of a high strength welded steel pipe having a tensile strength of≥850 MPa and subjected to seam welding from the inside and outside faces are prevented. SOLUTION: In the method for producing a welded steel pipe having excellent embrittlement crack properties in a weld metal, and in a method for producing a welded steel pipe where a steel plate having a tensile strength of≥850 MPa is cylindrically formed, and the butted parts are subjected to submerged-arc welding from the inside and outside faces, the height in the thickness direction of the weld metal is reduced by 0.2 to 10% over the whole length in a welding direction. COPYRIGHT: (C)2007,JPO&INPIT
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