High-strength high-frequency electric resistance welding pipe and manufacturing method thereof

The invention discloses a high-strength high-frequency electric resistance welding pipe, which contains Fe and inevitable impurities, and further contains the following chemical elements in percentage by mass: 0.060 to 0.085 percent of C, 0.10 to 0.30 percent of Si, 1.60 to 1.85 percent of Mn, 0.01 to 0.12 percent of Ni, 0.10 to 0.30 percent of Cr, 0.01 to 0.15 percent of Mo, 0.040 to 0.065 percent of Nb, 0.005 to 0.020 percent of Ti, 0.020 to 0.050 percent of Al and 0.001 to 0.004 percent of Ca. Correspondingly, the invention also discloses a manufacturing method of the high-strength high-frequency electric resistance welded pipe, which comprises the following steps: (1) smelting and casting; (2) rolling a plate coil; (3) manufacturing a high-frequency welded pipe, namely (3a) butt welding of a plate coil; (3b) edge milling; (3c) forming; (3) high-frequency welding, wherein the extrusion amount is controlled to be larger than or equal to 0.6 T, and T represents the wall thickness of the pipe body; and (3e) w