The software View Cast was employed to predict the sizes and positions of the shrinkage porosities（holes）in the sideboard produced by lost foam casting.The results reveal that the sequential solidification can be achieved in the casting process

so absence of defect such as shrinkage porosities can be observed in the sideboard with sound structure

meeting the technical requirements.The microstructure of the sideboard prepared is mainly composed of acicular ferrite and pearlite as well as shperoidal graphite.With heated to 500 ℃and 700 ℃

there exist no obvious changes of the hardness and microstructure.With heated to 900℃

ferrite austenite is transformed into the broken ferrite and pearlite uniformly distributed in the microstrucutre after cooling

at the same time

the samples are increase in hardness.The analysis of oxidation experiments show that the temperatures have great influence on the oxidation rate of sample

which are attributed to different thickness of oxide films formed under different temperatures resulting in the varied oxidation rate of the samples due to changing the diffusion rate of Fe and oxygen.