| 摘要 |
PURPOSE:To cast a continuous slab of a martensitic stainless steel which does not require surface conditioning by using a specific mold powder and specifying the oscillation conditions of a casting mold. CONSTITUTION:Mold powder of which the viscosity at 1,300 deg.C is 1.5-2.5 poise is used and the oscillation conditions for a casting mold conforming to the equation I and satisfying the equation II are specified. The tN, tP in the equations I , IIare expressed respectively in the equations III, IV and in the equations III, IV, V; the drawing speed of a casting mold (mm./sec), (f); the oscillation frequency of the mold (cycle/sec), (a); amplitude (mm.). If a martensitic stainless steel is cast continuously under such conditions, the generation of the defect occuring in an oscillation mark is obviated and the need for surface conditioning is eliminated. |
