Steel for high-frequency resistance straight weld oil well pipe and production method thereof

The invention relates to a steel for a high-strength oil well pipe and a production method thereof, in particular to a steel for a high-frequency resistance straight weld oil well pipe and a production method thereof, solving the technical problems that the steel for an ERW (Electrical Resistance Weld) oil well pipe in the prior art cannot meet the steel for N80 grade non-quenched ERW welding non-quenched oil well pipes due to extremely-low strength and toughness, higher yield, no favorable matching of the strength and the plasticity. The invention designs the steel for the high-frequency resistance straight weld oil well pipe. The steel is characterized by comprising the following chemical components in percentage by weight: 0.05-0.13 percent of C, 0.10-0.40 percent of Si, 1.0-1.8 percent of Mn, 0.1-0.5 percent of Cr, 0.1-0.5 percent of Mo, 0.02-0.06 percent of Nb, 0.02-0.06 percent of Ti, not more than 0.025 percent of P, not more than 0.020 percent of S and the balance of Fe and inevitable doped elements. The invention can be used for producing oil casings and oil pipes.