Anticorrosion high-strength alloy and smelting method thereof, as well as product of alloy and processing method of same

The invention discloses an anticorrosion high-strength alloy, consisting of the following elements in percentage by weight: 30 to 40 percent of Ni, 18 to 22 percent of Cr, 7 to 12 percent of Mo, and the balance of Co and unavoidable impurities. The content of the impurities has the following elements in percentage by weight: less than 0.05 percent of C, less than 0.20 percent of Si, less than 0.25 percent of Mn, less than 0.010 percent of S, less than 0.015 percent of P, less than 1.0 percent of Tim, and less than 2.0 percent of Fe. The smelting method comprises the following steps: 1) selecting the required chemical elements, smelting the elements in a vacuum inductance furnace, regulating the content of each element in the smelting process to ensure the weight of each element accords with the designing requirement, controlling the content of impurity elements as low as possible, and casting the alloy into a consumable electrode by a vacuum casting method; and 2) carrying out electroslag remelting on the consumable electrode to further reduce the content of impurity elements to ensure that the electrode accords with the designing requirement to obtain an electroslag remelt ingot with excellent quality. The alloy and the metal product manufactured by the corresponding process method have higher strength and excellent anticorrosion performance.