Preparation method of nickel-chromium intermediate alloy through vacuum induction melting

The invention discloses a method for preparing a nickel-chromium intermediate alloy through vacuum induction melting, which comprises the following steps: proportioning: proportioning 30-50% by mass of Cr, 0.005% by mass of deoxidizer and the balance of Ni to obtain an alloy material; the alloy material is loaded into a crucible, a vacuum induction furnace is closed, a deflation valve is closed, a mechanical pump is started, vacuumizing is conducted, and a roots pump is started; smelting, namely heating, raising the temperature, increasing the power in a gradient manner, reducing the power after the raw materials in the crucible are uniform up and down, slowly filling high-purity argon into a furnace body, stopping gas filling when the pressure in the furnace is increased to 0.08 Mpa, and increasing the power for refining; deoxidation treatment: adding a deoxidizing agent for deoxidation treatment; casting: the deoxidation treatment power is reduced, and casting is started after the deoxidation treatment powe