| 摘要 |
A blast tuyere of a blast furnace making it possible that the temperature of Cu of the outer surface of the tuyere is not overheated to its melting point or higher so as to prevent tuyere failure and endure long-term use. This tuyere comprises a tuyere trunk 1 having a cooling chamber 2 of a tuyere body and a cooling chamber 3 of a tuyere nose. At least the upper half of the whole of the outer circumference surface of a portion being in the tuyere trunk and projecting into the blast furnace, or the whole excluding the forefront of the outer circumference surface is coated with a shell layer 5 made of a material having a higher melting point than the melting point of Cu and temperature of a hot metal in the blast furnace. Furthermore, a jacket 4 made of a metal for protecting the tuyere from mechanical impacts received at the time of inserting the tuyere into the blast furnace is fitted onto the outside of the shell layer.
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