八幡製鐵所新第一製鋼工場建設に就て
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概要
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The open-hearth plant, the plant of which is shown in Fig.1, consists of four tilting furnaces of 100 tons capacity and one active mixer of 300tons capacity. These are in one line, the mixer being placed between two pairs of furnaces. The building, the cross-section of which is shown in Fig.2, consists of four bays, namely, stockyard bay, charging bay, tapping bay and casting bay. The stockyard, which is not completely covered in, has two 15ton overhead box lifting and magnet cranes and two 20ton larry cars running along the bunkers full-filled with iron ores, manganese ores, calcined lime and others carried to by a locomotive. The charging boxes are handled in special containers, each holding 3 boxes. The boxes, having been filled on the ground floor, are lifted on to the extention of the furnace platform projecting into the stockyard. The furnaces and the mixer, designed suitable to use the mixed gas, are served by two 5ton revolving type open-hearth charging cranes, each having 10ton auxiliary hoist. The hot metal is charged into the furnaces or the mixer in the tapping bay, the pre-refined metal from the mixer provided to them by two 60ton hot metal cranes on the upper rails and three 100 ton ladle-cranes on the lower rails, in the same bay. From the inception of the plant, it was decided to exploit the use of mixed gas of the coke-oven gas and the blast-furnace gas, in order to a minimum the purchase of external fuel. To secure the most efficient use of the gases, the plant is well supplied with instruments. The gases are metered separately at each point of use for the purposes of holding at a good mixing rate as economically possible. The amounts used are continuously recorded for each individual part. The slag is taken from the furnaces on the charging side the slag-ladle being run into position from the stock-yard bay side under and at right angles to the furnaces, there being a track to each furnace and two tracks to the mixer. The finished steel in the furnace is tapped into two 60ton ladles which are transfered to the teeming cranes moved in the casting bay. Then the ingots are cast in moulds arranged in the casting-pits, and carried off by a locomotive to the blooming mills, after baving been sat on the cars by three 12ton stripping cranes running over the casting bay.
- 社団法人日本鉄鋼協会の論文
- 1937-02-25