Process method for smelting invar alloy

The invention relates to the technical field of invar alloy smelting, in particular to a process method for smelting invar alloy, which comprises the following steps: step 1, an intermediate frequency furnace is filled with an iron-nickel alloy raw material, the tapping temperature of the intermediate frequency furnace is 1590 +/-20 DEG C, and the power consumption per ton of steel of the intermediate frequency furnace is 520 +/-30Kwh/t; 2, after melting in the intermediate frequency furnace, adding AOD for smelting; thirdly, deslagging is conducted after oxygen blowing and P removal are completed in the AOD; 4, after AOD deslagging, component adjustment is carried out, and molten steel deoxidation is carried out; and 5, adjusting components and temperature of the LF, and treating the molten steel in an LF station. The method is a domestic pioneering low-cost invar alloy smelting process method, on the premise that the product quality is guaranteed, the invar alloy with the components meeting the requirements