Si-Al-Ca alloy deoxidizing agent for steel making

A Si-Al-Ca alloy deoxidizing agent for steel making can effectively solve the problems that the cost of pure aluminum de-oxidation in steel making is high, nozzle clogging takes place, and labor strength of cleaning is high. The Si-Al-Ca alloy deoxidizing agent comprises, by weight, the metal raw materials including 25-35 kg of silicon iron, 35-45 kg of aluminum metal, 10-20 kg of calcium metal and 10-20 kg of steel blocks. The preparation method for the alloy deoxidizing agent comprises the following steps: crushing silicon iron into blocks of 20-40 cm, crushing aluminum metal powder into particles, crushing the calcium metal into blocks, mixing the blocks and the particles with the steel blocks, preheating an electric furnace to over 800 DEG C, delivering a mixture of the four metals into the electric furnace for smelting, pouring the mixture in the electric furnace into a tundish when the mixture is melted completely and the temperature reaches 1000-1500 DEG C, conducting pouring sizing in an ingot mold, a