Large-specification ODS steel preparation method based on smelting, thin-strip cast rolling and compound forming

The invention belongs to the field of metal materials, and particularly relates to a large-specification ODS steel preparation method based on smelting, thin strip cast rolling and composite forming. The method comprises the following steps: (1) smelting molten steel according to set components; (2) before pouring, Y and Ti are added to control burning loss; (3) when the molten steel flows through a flow distribution bag, adding an oxygen-enriched precursor (0-20% of FeO + Fe2O3) into the molten steel through a quantitative powder feeding process; (4) the oxygen-enriched precursor and the molten steel are fully and uniformly mixed in a molten pool and then rapidly solidified and formed, and rare earth and oxygen atoms are uniformly and solidly dissolved in a matrix; (5) slitting the cast strip, carrying out vacuum sheathing and rolling, and then cutting off a sheathing material; and (6) after secondary or multi-time composite hot rolling, performing heat treatment to obtain the final performance. Uniform soli