Smelting process of low-aluminum high-titanium iron-based A286 alloy large-size cast ingot

The invention discloses a smelting process of a low-aluminum high-titanium-iron-based A286 alloy large-size cast ingot, and aims to provide the cast ingot with stable and reliable chemical components for an impeller forge piece for a large centrifugal compressor so as to ensure that the performance of the forge piece meets the use of a compressor impeller. According to the technical scheme, 1, an electric arc furnace (EAF), an LF furnace, a VOD/VHD furnace and a protective atmosphere electroslag furnace are adopted for smelting (phi 750 mm) ingot casting, the non-metallic inclusion level of a large ingot type and the forging ratio of a large forged piece are solved, and the finished product structure and the product performance are improved; 2, according to the aluminum and titanium components of the electrode blank, titanium dioxide powder is added into the ternary pre-melting slag system, and aluminum powder is added in the process, so that the burning loss of the easily burnt element titanium is solved, an