抄録
Stator flange castings were produced in our foundry as the parts for a 1 million kwh power generator at the Hekinan Plant of the Chubu Electric Company. Nonmagnetic ductile iron was applied as its material. The guarantees of their permeability and the mechanical properties were required in the trepan test samples taken from the stator flange castings using a core drill. Since the sensitivity of the wall thickness on those properties is severer than that of normal ductile iron, the precise quality control was needed. The site theory was helpful to control the graphite nodularity and to avoid the chunky graphite formation. Heat treatment was conducted to gain the austenitic matrix structure. Nondestructive tests such as VT, PT and RT were applied to prove the soundness of the castings. As the results, all the properties required could be satisfied well.
