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    • 28. 发明专利
    • Melting method of low nitrogen killed steel
    • 低氮杀死钢的熔炼方法
    • JPS59190314A
    • 1984-10-29
    • JP6374183
    • 1983-04-13
    • Nippon Kokan Kk
    • SHIRATANI YUUSUKEHASEGAWA TERUYUKIMATSUDA YASUHIROKOMATSU YOSHIMIIKEDA MASABUMIKOBAYASHI HITOSHI
    • C21C7/06C21C7/04
    • C21C7/04
    • PURPOSE:To melt a low nitrogen killed steel in a short denitriding treatment time by tapping the steel without deoxidation or with half deoxidation to maintain the concn. of oxygen in the steel at a specific value or above then adding a deoxidizing agent and an alloy iron thereto in a low nitrogen atmosphere then subjecting the steel to vacuum degassing. CONSTITUTION:Molten steel is tapped from a converter 1 to a ladle 2 in the state of un-deoxidation (about >=150ppm concn. of O in the steel) without addition of a deoxidizing agent or after the steel is half deoxidized to the extent of assuring >=40ppm concn. of O in the steel. The ladle 2 is then capped and gaseous Ar is blown therein. The deoxidizing agent and the entire volume of the alloy iron are charged into the steel in a low nitrogen atmosphere. The steel is subjected to a degassing treatment with an installation 3 of RH (reflux type vacuum degassing device) or the like, by which the steel is denitrided. The nitrogen is less absorbed in the steel in the stage of tapping according to the above- mentioned method and therefore the killed steel contg. nitrogen in a low concn. is obtd. in a short denitriding time.
    • 目的:在短时间的脱氮处理时间内,通过对钢进行脱氧而不进行脱氧或半脱氧以维持浓度,从而熔化低氮杀死的钢。 的氧气在特定值以上,然后在低氮气氛下加入脱氧剂和合金铁,然后对钢进行真空脱气。 构成:在不脱氧剂的情况下,在未脱氧(约> = 150ppm浓度的钢中)将钢水从转炉1中分离到钢包2中,而不加入脱氧剂,或者钢在半脱氧后达到一定程度 确保> = 40ppm浓度 的O在钢。 然后将钢包2盖上,气体Ar吹入其中。 将脱氧剂和合金铁的总体积在低氮气氛中装入钢中。 对钢进行脱气处理,使用RH的装置3(回流式真空脱气装置)等进行脱氮处理。 根据上述方法,在攻丝阶段,氮在钢中吸收较少,因此, 低浓度氮 是obtd。 在短暂的脱硝时间。
    • 29. 发明专利
    • Method and device for adding molten additive into molten iron
    • 将添加剂加入到铁中的方法和装置
    • JPS59159920A
    • 1984-09-10
    • JP3340883
    • 1983-02-28
    • Kawasaki Steel CorpKomazawa Kinzoku Kogyo Kk
    • OONUMA KEIMEIBETSUSHIYO NAGAYASUOGUCHI MASAOKAKIO YASUHIROKOMAZAWA HIROSHI
    • C21C7/04
    • C21C7/04
    • PURPOSE:To adjust easily the amt. of the molten additive to be added to a molten iron and to add a required amt. thereof with good accuracy in the stage of feeding under pressure the molten additive in a hermetic vessel through a suspended tubular body into the molten iron by controlling the amt. of the additive to be added with a target value and feeding pressurized gas into the tubular body. CONSTITUTION:An additive of the amt. larger than the target value W to be added is put into a hermetic vessel 1 which is then hermetically sealed. The value W and the value (w) slightly smaller than the same are set in a control device 11 and when a detector 10 for the amt. of the additive to be added and the device 11 are operated, a shutter 12 is opened by a driving device 13 and the additive in the vessel 1 flows downward through the inside of a tubular body 3. When pressurized gas is fed into the vessel 1 by a means 5, the additive is forcibly fed into a molten iron 2. When the amt. of the additive value to be added attains the value (w), the shutter 12 is driven and opened to a prescribed opening degree by the devices 11, 13 in accordance with the input from the device 10, by which the speed of addition is decelerated. When the amt. of the additive to be added attains further the value W, the shutter 12 is closed and the downflow of the additive is stopped; at the same time, gas is fed into the body 3 through a means 14 and the additive in the body 3 is forcibly fed fully into the iron 2.
    • 目的:轻松调整amt。 的熔融添加剂加入到铁水中并添加所需的amt。 在密封容器中的熔融添加剂通过控制悬臂通过悬挂的管状体进入熔融铁的阶段中具有良好的精度。 的添加剂加入目标值并将加压气体供给到管状体中。 构成:amt的添加剂。 将大于待添加的目标值W放入密封容器1中,然后气密地密封。 在控制装置11中设定值W和略小于该值的值(w),并且在用于amt的情况下设定检测器10。 的添加剂和装置11操作时,闸板12由驱动装置13打开,并且容器1中的添加剂向下流过管状体3的内部。当加压气体被供给到容器1中时 通过5号手段,将添加剂强制送入铁水2中。 要添加的添加值达到值(w)时,根据来自装置10的输入,通过装置11,13将闸门12驱动并打开到规定的开度,加速速度减速 。 当amt。 要添加的添加剂进一步达到值W,则闸门12关闭并且添加剂的下流停止; 同时,气体通过装置14进入主体3,并且主体3中的添加剂被强制地进入铁2。