The steel and steel bearing trial produced by horizontal casting scheme is shown in Fig. 1. The overall appearance quality of the steel castings produced by EPC process is good, and there are no sand sticking and scab defects in the hole groove. However, there are slag blowholes visible to the naked eye on the upper plane and corners of the casting theory, as shown in Fig. 2.
The test pieces were machined by vertical lathe to verify the internal quality of castings. After 3 mm is removed by machining, there are inclusion defects visible to the naked eye at the corner of the casting, as shown in Fig. 3-12. The inclusions are mainly molten steel slag and carbon residue which is not fully pyrolyzed by foam.