Hot-rolled steel strip for CT90 level continuous pipe and production method of hot-rolled steel strip

A hot-rolled steel strip for a CT90 level continuous pipe comprises chemical components including, by weight percent, 0.05%-0.10% of C, 0.10%-0.30% of Si, 0.40%-0.90% of Mn, smaller than or equal to 0.015% of P, smaller than or equal to 0.0020% of S, 0.25%-0.40% of Cu, 0.15%-0.35% of Ni, 0.50%-1.00% of Cr, 0.10%-0.20% of Mo, 0.020%-0.050% of Nb, smaller than or equal to 0.010% of V, 0.010%-0.030% of Ti, smaller than or equal to 0.0050% of N, 0.015%-0.060% of Al, 0.0008%-0.0025% of Ca and 0.0008%-0.0015% of B. A production method comprises the steps that a cast ingot is heated after smelting and ingot casting; rough rolling is conducted; finish rolling is conducted; cooling is conducted in three stages; and after a steel roll is rolled, the steel roll is placed in a thermal insulating wall to be subjected to slow cooling. Through adding of the B, the content of the C is reduced, structure segregation of the steel is improved, and it is ensured that the HIC resisting and SSCC resisting performance is qualified; through composite adding of the Cu and the Ni, the hot shortness of the Cu is improved; staging controlled cooling is conducted, regulation and control over a complex phase structure are achieved, and the yield ratio of the steel strip is reduced.