| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a refractory for an injection tuyere by which peeling caused by spalling cracks is reduced and durability is enhanced, and to provide a method for producing the refractory for an injection tuyere. <P>SOLUTION: The refractory 1 for an injection tuyere, which is provided at the injection tuyere of a molten metal vessel and in which a hole passing from a face 1A forming the inner-furnace side face of the molten metal vessel through a face 1B confronted with the iron skin 5 of the molten metal vessel is formed, is composed of two layers of an inner circumferential material 4 facing to the hole 2 and an outer circumferential material 3 surrounding the inner circumferential material 4. The inner circumferential material 4 is obtained by being applied with an alumina-magnesia unshaped refractory, and in which, regarding the face exposed when viewed from the side of the face 1A forming the inner-furnace side face of the molten metal, the elastic modulus of the applied body at 1,200°C is ≤30 GPa, and the outer circumferential material 3 is composed of a material whose linear thermal expansion coefficient at 1,400°C is lower than that of the inner circumferential material. <P>COPYRIGHT: (C)2010,JPO&INPIT |
