Steel for petroleum sleeve connecting piece and production method of steel

The invention discloses steel for a petroleum sleeve connecting piece and a production method thereof and belongs to the technical field of metallurgy. The steel for the petroleum sleeve connecting piece comprises the following chemical components in percent by mass: 0.29-0.30% of C, 0.25-0.28% of Si, 0.51-0.54% of Mn, 0.008-0.012% of P, 0.003-0.006% of S, 0.96-0.97% of Cr, 0.190-0.200% of Mo, 0.024-0.030% of Alt, 50*10-58*10% of N, 12*10-14*10% of T.O and balance of Fe and inevitable impurities. The production method of the steel for the petroleum sleeve connecting piece comprises the following production processes: electric furnace primary smelting, LF (low frequency) refining, VD (vacuum degassing), continuous casting, slowly cooling of a casting blank, testing and finishing. Cleanliness, tissue compactness and uniformity of a continuous casting round billet, obtained by adopting the production method, for the petroleum sleeve connecting piece are greatly improved, and requirements for the