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本发明提供一种高强度焊接钢管,该高强度焊接钢管的钢管母材抗拉强度为760MPa以上,不进行预热和后补加热就可以防止在焊缝金属中产生横向裂纹,其缝焊部的焊缝金属具有780MPa以上的抗拉强度,并且内表面缝焊部的焊缝金属
The present invention provides a high-strength welded steel pipe having a tensile strength of 760 MPa or more of a steel pipe base material which prevents lateral cracking in the weld metal without preheating and post-heating, Of the weld metal has a tensile strength of 780 MPa or more and the weld metal of the inner surface seam weld