Pockmark can easily occur on the surface of investment casting martensite chromium stainless steel

which is a common flaw and difficult to solve during investment casting.According to the formation mechanism

different test schemes were carried out to verify the necessary conditions for the formation of pockmark defects and various solutions were put forward.First special magnetic separation equipment was used for shell material magnetic separation to reduce magnetic oxide.Second

flake graphite sand is used as the transition layer during the process of shell making

which could not only create the reduction atmosphere but also prevent the penetration of ferric silicate

effectively avoiding the generation of pockmark.