Machining process of large super duplex stainless steel guide vane body

The invention relates to a machining process of a large super duplex stainless steel guide vane body. The machining process comprises the steps of casting, deformation protection before heat treatment, solid solution treatment, casting cleaning rough grinding, component rechecking, mechanical performance checking, PT dye penetrant inspection, defect cleaning-away repair welding rough grinding, rough machining, finishing, stress relief heat treatment, semi-finish machining, finish grinding finish machining and the like. According to the machining process, the machining hardening effect is small, size deformation is small, the machining size precision of the guide vane body is good, and surface smoothness is high. Finishing size checking is controlled to be below 40 DEG C; and the machiningefficiency is high, quality is good, the size precision and small form and position and dimensional tolerance deformation of the guide vane body can be guaranteed, and the drawing size requirement andthe technical requirement