we have more than ten years experience in this industry specially for mining machinery Material:Carbon steel,low alloy steel:ZG20SiMn, ... -uniform cooling rateSurface projectionsErosion of sand mold interiorA crack in the sand moldMold halves shiftThere are no these problems ... as a hot spot, causes uneven cooling and can result in shrinkage, porosity, or cracking. CornersRound corners to reduce stress ...