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■■■■■■■■■■■■■■■■■■■ 川崎製鉄技報 KAWASAKI STEEL GIHO Vol.14 (1982) No.3 ■■■■■■■■■■■■■■■■■■■ |
| 転炉の溶射補修――フレーガンニング―― Application of Flame Gunning for HOr Fettling of BOF 森本 忠志(Tadashi Morimoto) 小倉 滋(Shigeru Ogura) 平松 輝男(Teruo Hiramatsu) 清水 益人(Masuto Shimizu) 内村 良治(Ryoji Uchimura) |
| 要旨 : コークスを熱源としてマグネシアの粉体を溶射する転炉炉壁の熱間補修技術（フレームガンニング）について述べた。本技術は、マグネシア微粉とコークス微粉を含む粉体を酸素と同時に炉内に噴出し，コークスの熱焼で得られる高温の火災中でマグレシア微粉の表面を溶融し炉壁に付着させる。従来の化学結合を利用した補修法と異なり，フレームガンニングでは溶着による強固な付着層が得られる。千葉第１製綱工場では，このフレームガンニング設備を導入し，補修技術の向上をはかって，転炉の炉寿命延長，耐火物原単価の低減が得られている。 |
| Synopsis : A thermal spraying technique in which dead bumed magnesia powder is partially fused in flames made by combustion of premixed coke powder in oxygen gas folw and bonded to the furnace wall has been applied to the furnace wal has been applied to the hoto repair of BOF. The technique is called the "flame gunning" and introduced to No.1 Steelmaking Shop at Chiba Works, were heard operation such as stainless steel blowing is carried out. As the flame gunned layer has such low porosity as that of burned magnesia-dolomite brick, it can withstand two heats of stainless steel blowing and 11 heats of low alloy steel bolowing. 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 increse in the continuous casting ratio and rising of tap temperature are inevitable. |
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