Abstract
The fluidity of tin bronze was estimated from the filling ratio in the permanent mold, and the influence of the amount of tin, casting conditions, thickness of the casting and mold on fluidity was investigated. Fluidity increases as the superheat of melt and the mold temperature increase. It is difficult to obtain sound castings less than 6mm in thickness when pouring into permanent mold at room temperature. The addition of phosphorus causes the transition from the columnar grains to equiaxed ones and makes the dendrite structure coarse, because the freezing range of the tin bronze alloy is widened. Thus, fluidity increases with the increase of the phosphorus content. Fluidity decreases as the tin content increases up to the solubility limit, and then increases with the increase of the tin content.
