| 摘要 |
PROBLEM TO BE SOLVED: To obtain a lance resisted to hot blasting at a specific surrounding temp. without applying water-cooling and excellent in durability by constituting the lance of a tube formed of oxide dispersion type iron base alloy containing a specific ratio of yttria (Y2O3). SOLUTION: This lance is composed of the tube formed of the oxide dispersion type iron base alloy containing 0.1-1.0 mass % yttria (Y2O3) and resisted to the hot blasting at the surrounding temp of about 1200 deg.C. Desirably, the iron-base alloy contains, by mass, 18.0-20.0% Cr, 4.0-6.0% Al and 0.1-1.0% Ti. Further, the iron base alloy has excellent heat resistance and at the same time, in the improvement of a creep strength without causing such trouble as hang- down of the lance. The blowing lance has the structure of inserting the lance 3 for blowing pulverized fine coal, which is constituted of a metallic pipe, into a blowing pipe 1 arranged on a blast furnace wall and a tuyere 2. In the case of the oxide dispersion type alloy-made non-water cooling lance, the continual use having >=1 year can be obtd. and the remarkably excellent durability in comparison with a heat resistant steel-made non-water cooling lance, is obtd.
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