Casting Method Study and Practice for Heavy Stainless Steel Diversion Shell
Author of the article:ZHANG Jiyan;ZHANG Bin;LIU Zhongli
Author's Workplace：Yantai Taihaimanuer Nuclear Equipment Co.,Ltd.,Yantai 264003,China;School of Nuclear Equipment and Nuclear Engineering,Yantai 264003,China
Key Words：diversion shell stainless steel casting method
Abstract：The heavy stainless steel discharge bowl for seawater circulation system,used in conventional island of nuclear power plant,is easy to generate some defects,such as distortion,crack,slag inclusion and so on when make the casting.In this paper,based on the analysis of the product shape,quality requirement,material and working environment,corresponding solutions were proposed,finally,the qualified pilot casting was made.The results show that,firstly,mold precision,core assembly precision and control of sand boxes closing are the key points to guarantee the dimensional precision of discharge bowl;secondly,the risers should be placed at the thin wall position to prevent shrinkage porosity and make the stress even;thirdly,circular ribs avail distortion avoidance.
