High-performance seamless continuous pipe and manufacturing method thereof

The invention discloses a high-performance seamless continuous pipe and a manufacturing method thereof. The method comprises the steps of preparing a continuous pipe dedicated board through processesof high-purity refining, continuous casting, thermal controlled rolling and controlled cooling, acid pickling and the like; preparing pipe blanks through rolled plate longitudinal shear, steel strip abut joint, cage-roll forming and high-frequency induction welding with protection gas; continuously producing equal-outer-diameter or variable-outer-diameter pipes through hot rolling reducing of thesame specification of pipe blanks; destressing the pipes to achieve the aims of reducing the pipe residual stress, improving the pipe toughness and reducing the pipe hardness, and obtaining the continuous pipe product with the good comprehensive property. The continuous pipe product meets the API standard need, through the hot rolling reducing technology, the pipe annular and longitudinal weldingjoint structure is obviousl