| 摘要 |
<p>PURPOSE:To improve the quality and the productivity of a steel by forming a filter as a screw shape molten metal passage having plural bending parts. CONSTITUTION:The colliding hole type filter for filtrating molten metal is formed as the screw shape molten metal passage having plural bending parts. The screw shape is made to satisfy the condition of 30-100mm the outer diameter, 10-90mm the inner diameter and 10-20mm the screw pitch and the thickness of the filter is made to be 50-100mm. The material of the filter is suitable to be constituted with a refractory combined of MgO, Al2O3, CaO, MgO-CaO, Al2O3-SiO2 (particularly mullite quality). By action of the plural bending parts formed with female screw type thread ridge, the contact surface of the molten metal in the molten metal passage is increased and the removing efficiency of inclusion is drastically improved.</p> |
