Abstract
The fluidity of AC4CH alloy in thin sections was measured using a vacuum fluidity test equipment. Molten metal was drawn into test tubes (of quartz, stainless and copper tube) under carefully controlled conditions. The influence of test variables, such as suction pressures, test tube properties, shielding gases in the test tube and coating of paraffin wax on copper tubes, on the fluidity was examined. The fluidity length increases linearly with increasing tube diameter and with increasing superheat. The fluidity length is proportional to the square root of the effective suction pressure. The fluidity decreases with increasing thermal conductivity of tube material. The fluidity is improved by using paraffin wax coating and by using Argon atmosphere.
