Recently, the CAP1400 nuclear power regulators forging manufactured for the first time in China was successfully cast in a one-time smelting workshop at the No.2 Heavy Machinery Group's steelmaking plant in China. CAP1400 Nuclear Power Regulator Forgings adopts the third generation of non-active nuclear power generation units with independent intellectual property rights in China. The chemical composition of the CAP1400 requires strict control of the products. Non-destructive flaws and mechanical properties are the most demanding indicators. CAP1400 is currently the most difficult product for smelting one. The smelting process must be completely dephosphorization, desulfurization, degassing, remove inclusions, but also precise control of chemical composition, to maximize the purity of ingot to ensure product quality. Second, the preparation of raw materials, production equipment status and the relevant measures to be taken were fully prepared. Smelting and pouring process, the strict control of phosphorus content, precise control of chemical composition, improve the purity of molten steel; the same time, careful injection speed control, effectively prepared, meticulous smelting, careful pouring to ensure that the chemical composition of smelting technology Parameters fully meet the technical requirements.