Production method of steel for medium-carbon wind power screw sleeve

The invention relates to a production method of steel for a medium-carbon wind power screw sleeve, the steel comprises the following chemical components in percentage by weight: 0.30%-0.40% of C, 0.17%-0.37% of Si, 1.00%-1.40% of Mn, 1.10%-1.30% of Cr, 0.030%-0.070% of Al, less than or equal to 0.030% of P, less than or equal to 0.030% of S, less than or equal to 0.20% of Cu, 0.0020%-0.0060% of B, less than or equal to 0.0030% of N, less than or equal to 0.0012% of O and the balance of Fe and inevitable impurities, the diameter of produced round steel is 60-90 mm, the heat treatment mechanical property reaches more than 10.9 grade, and the KV2 impact toughness value at-40 DEG C is more than or equal to The process comprises the steps of converter smelting, LF furnace refining, RH vacuum treatment, continuous casting pouring, controlled rolling and slow cooling. The produced steel for the medium-carbon wind power threaded sleeve is suitable for manufacturing the wind power threaded sleeve with the round steel