... industry specially for mining machinery Material:Carbon steel,low alloy steel:ZG20SiMn,ZG50Mn,ZG35SiMn,ZG35CrMo,ZG35SiMnMo,ZG42CrMo, ... Break away the sand mold and remove the casting. Standard&certificate:ASTM,BS,NF,DIN,JIS and so on ... temperaturePorosityMelt temperature is too highNon-uniform cooling rateSand has low permeabilityHot tearingNon-uniform cooling rateSurface projectionsErosion of sand ...