Abstract: Based on the ring rolling theory and the principle of invariable volume during the rolling process, the design principle of flange blanks and the limit scope of process parameters were determined for producing high neck flanges. The closed ring rolling process of the flange blanks was simulated by a finite element model (FEM). According to the simulated results the optimal process parameters were obtained by analyzing the influences of process parameters on the product quality and the mechanical parameters. Closed ring rolling experiments of high neck flanges were carried out in a D51-450 ring rolling mill with a self-designed mould. The reliability of the finite element simulation was proved by comparing the simulated results with the experimental ones.