| 摘要 |
PURPOSE:To provide a titled vessel for stirring which economizes stirring gas by disposing a multihole plug produced by monolithic molding of refractories having many fine holes under the surface of molten steel. CONSTITUTION:A multihole plug which consists of refractories 1 having 30- 100 pieces of through-holes 2 having 0.1-3.0mm. diameter and formed by monolithic molding, and is mounted with a metallic cover 3, a pressure box 4 consisting of top and bottom metallic plates 5, 6 and a gas feed pipe 7 is mounted to the set brick 9 in the bottom of a vessel for steel making which refines molten steel by top blowing of oxygen, under the surface of the molten steel in said vessel. The above-described refractories contain 5-30% C and the balance >=1 kinds selected from MgO, Al2O3, Cr2O3, ZrO2, are less eroded, and have excellent quality in resistance to spalling and abrasion, strength, etc. The through-holes of small diameters for blowing gas contribute to the prevention of clogging with blowing of a small amt. of gas. |
