| ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ KAWASAKI STEEL TECHNICAL REPORT No.7 ( March 1983 ) ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ |
| Application of Flame Gunning to Hot Fettling of BOF Tadashi Morimoto, Shigeru Ogura, Teruo Hiramatsu, Masuto Simizu, Ryoji Uchimura |
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Synopsis : A thermal spraying technique in which dead burnt magnesia powder is partially fused in flames made by combustion of premixed coke powder in oxygen flow gas and bonded to the furnace wall has been applied to the hot repair of BOF. The technique is called the "flame gunning" and introduced to No.1 steelmaking shop at Chiba Works, were hard operation such as stainless steel blowing is carried out. As the flame gunned layer has such low porosity as that of burnt magnesia-dolomite brick, it can withstand 2 hearts of stainless steel blowing and 11 hearts of low alloy steel blowing. By the introduction of flame gunning, the total refractory cost has been reduced to 26% less than the cost without the gunning. As the flame gunning has many advantages such as short repairing time, high corrosion resistance of the gunned layer and low cost, it can be said that the flame gunning is a desirable technique for the future BOF operation in which an increase in the continuous casting ratio and rising of tap temperature are inevitable. |
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