By measuring the casting properties of low carbon equivalent gray cast iron treated by different processes, the following conclusions are obtained:
- The addition of rare earth alloy in the melting process can effectively improve the fluidity of low-carbon equivalent gray cast iron. The fluidity of low-carbon equivalent gray cast iron first increases and then decreases with the increase of the amount of rare earth alloy. When the amount of rare earth alloy is 0.1%, the fluidity of molten iron is the best.
- The shrinkage of low-carbon equivalent gray cast iron is large. With the increase of rare earth alloy, the shrinkage of low-carbon equivalent gray cast iron decreases first and then increases. When the amount of rare earth alloy is 0.1%, the shrinkage is the smallest.
- The eutectic crystallization time of low carbon equivalent gray cast iron can be increased by adding rare earth. When the amount of rare earth is 0.1%, the eutectic crystallization time is the largest.
- Adding a certain amount of rare earth shoe iron alloy in the melting process of low carbon equivalent gray cast iron can play an obvious inoculation role, promote graphitization, reduce the tendency of white cast iron and increase the eutectic crystallization time. However, excessive addition will promote the white cast iron of low carbon equivalent gray cast iron. The inoculation effect is good when the amount of rare earth is 0-0.2%, but when the amount of rare earth is more than 0.25%, the white tendency of cast iron increases obviously and the modification effect changes suddenly.