Medium-strength high-toughness corrosion-resistant weldable alloy and preparation method thereof

The invention discloses a medium-strength high-toughness corrosion-resistant weldable alloy and a preparation method thereof. The alloy comprises the following components by mass percent: 3.0 to 8.0% of Al, 0.3 to 3.0% of V, 0.3 to 3.0% of Sn, 0.3 to 4.0% of Zr, 0.3 to 3.0% of Mo and 0.02 to 0.50% of Si, and the balance being Ti. The alloy is prepared through the steps of raw material weighing, ingot smelting, blooming forging and plate rolling. According to the invention, the prepared alloy has good cold and hot processing and casting performances, can be formed into forged pieces, plates and castings, and has relatively high plasticity and toughness and good welding property and seawater corrosion resistance.