| 摘要 |
PROBLEM TO BE SOLVED: To provide a lance pipe having a curved part of a core metal, in which the core metal is hardly worn even when a solid molten metal treatment agent such as powder is introduced, and which can be easily manufactured.SOLUTION: The lance pipe 1 for supplying the solid molten metal treatment agent to molten metal includes the cylindrical core metal 10 made of metal, and a refractory layer 20 covering the outer circumferential surface of the core metal. The core metal includes a straight pipe part 11 linearly extended from an inlet port 21 for introducing the molten metal treatment agent and a curved pipe part 12 extended from the straight pipe part in a curved shape. The line pipe 1 includes one or more metallic protruding pieces P protruding from the inner circumferential surface on the side corresponding to the outside relative to the curve of the curved pipe part in the inner circumferential surface of the straight pipe part and the curved pipe part of the metal core in a height of 1/20-1/2 of the inside diameter of the core metal. |
