Cr-Ni-Mo合金铸钢大型水轮机转轮叶片,经铸造-热处理-机加工-焊接等多工序制造。本文介绍设计底返开放式浇注系统,运用MAGMA凝固模拟对冒口、补贴进行优化,采用组芯造型,严格材质成分控制,通过正交试验优化热处理工艺,以及严格管理,成功制造大型水轮机叶片。 Cr-Ni-Mo alloy steel castings large turbine runner blades, casting - heat treatment - machining - welding and other manufacturing processes. In this paper, the design of bottom pouring opencasting system is introduced, the riser and subsidy are optimized by MAGMA solidification simulation, the core shape is adopted, the material composition is controlled strictly, the heat treatment process is optimized through orthogonal experiment and the large hydraulic turbine blades are successfully manufactured.