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Energy and output-optimised method and assembly for producing hot rolled steel strips

机译:能源和产量优化的方法和用于生产热轧钢带的组件

摘要

The method of continuously or semi-continuously producing hot steel strip, comprises rolling a slab (3) guided through a slab-guiding device (6) in four rolling stages using a four-stand roughing train (4) or in five rolling stages using a five-stand roughing train to form an intermediate strip (3'), heating the intermediate strip using an inductive heating device by a cross-field heating method at 1170[deg] C for 5-13 seconds, cooling the intermediate strip at a cooling rate of 2.5 K/m, and rolling the intermediate strip in four rolling stages using the four-stand roughing train. The method of continuously or semi-continuously producing hot steel strip, comprises rolling a slab (3) guided through a slab-guiding device (6) in four rolling stages using a four-stand roughing train (4) or in five rolling stages using a five-stand roughing train to form an intermediate strip (3'), heating the intermediate strip using an inductive heating device by a cross-field heating method at 1170[deg] C for 5-13 seconds, cooling the intermediate strip at a cooling rate of 2.5 K/m, rolling the intermediate strip in four rolling stages using the four-stand roughing train or in five rolling stages using the five-stand roughing train to form a final strip (3'') with a thickness of less than 1.2 mm, and cooling the final strip between an end of the slab-guiding device and an inlet region of the roughing train by an ambient temperature. The thickness of the slab that is cast in a die is reduced to 95-115 mm in a liquid core reduction process using the adjoining slab-guiding device. A slab support length measured between the meniscus such as a bath level of the die and an end of the slab-guiding device facing the roughing train is = 20.1-23 m, and a casting speed is 3.8-7 m/min. The slabs with different thicknesses are poured into the cast, where the slab with 110-120 mm thickness is produced at the casting speed of 3.8-5 m/min, the slab with 95-110 mm thickness is produced at the casting speed of 5-5.9 m/min and the slab with 102 mm thickness is produced at the casting speed of = 5.9 m/min. The slab is rolled in the roughing train within 50 seconds, where a first slab is rolled in the roughing train within 6.2 minutes. A reduction in the thickness of 40-55% of the slab carried out in the roughing train in per rolling stage. The intermediate strip is rolled in the finishing roughing train within 8 seconds. The slab exiting from the die and entering into the slab-guiding device has a slab thickness of 115-125 mm. Guiding elements of the slab-guiding device are adjusted relative to a longitudinal axis of the slab for the liquid core thickness reduction of the slab, where an adjustment of the guide elements is performed depending on the material of the slab and/or the casting speed. The slab thickness is: dynamically and quasi-statically adjustable at the beginning of a casting sequence such as shortly after discharge of the slab from the die; and adjustable during the casting process or during the passage of the slab through the slab-guiding device. The slab thickness measured with the casting speed is observed in a stationary-continuous operation of the plant according to vc = K/d 2for using a spray device in a region of the slab-guiding device that is hard to be cooled by applying 3-4 liters of coolant per kg slab steel, where K is a speed factor at a slab supporting length of 17.5 m in a corridor area of 45500-48900, which is suitable for the determination of casting speeds or slab thickness for the plant. The slab thickness measured with the casting speed is observed in the stationary-continuous operation of the plant according to vc = K/d 2for using a spray device in a region of the slab-guiding device that is medium-hard to be cooled by applying 3-4 liters of coolant per kg slab steel, where K is the speed factor at a slab supporting length of 17.5 m in a corridor area of 59,9000-64,600, which is suitable for the determination of casting speeds or slab thickness for the plant. The slab thickness measured with the casting speed is observed in the stationary-continuous operation of the plant according to vc = K/d 2for using a spray device in a region of the slab-guiding device that is soft to be cooled by applying less than 2.2 liters of coolant per kg slab steel, where K is the speed factor at a slab supporting length of 23 m in a corridor area of 53950-59000, which is suitable for the determination of casting speeds or slab thickness for the plant. An independent claim is included for a plant for continuous or semi-continuous production of hot steel strip.
机译:连续或半连续生产热轧钢带的方法,包括使用四机架粗轧机(4)在四个轧制阶段中轧制通过板坯导向装置(6)的板坯(3),或者使用五机架粗轧机以形成中间带材(3'),使用感应加热装置通过交叉场加热方法在1170℃下加热中间带材5-13秒,然后在250℃下冷却中间带材。冷却速度为2.5 K / m,并使用四机架粗轧机在四个轧制阶段轧制中间带。连续或半连续生产热轧钢带的方法,包括使用四机架粗轧机(4)在四个轧制阶段中轧制通过板坯导向装置(6)的板坯(3),或者使用五机架粗轧机以形成中间带材(3'),使用感应加热装置通过交叉场加热方法在1170℃下加热中间带材5-13秒,然后在250℃下冷却中间带材。冷却速度为2.5 K / m,使用四机架粗轧机在四个轧制阶段轧制中间带材,或使用五机架粗轧机在五个轧制阶段轧制中间带材,以形成厚度较小的最终带材(3'')板坯导向装置的端部与粗轧机的入口区域之间的最终钢带的冷却温度应小于1.2mm。使用邻接的板坯引导装置,在液芯减小过程中,在模具中铸造的板坯的厚度减小到95-115mm。在弯月面之间的板坯支撑长度(例如模具的熔池高度)和板坯引导装置的面向粗轧机的端部之间测得的≥20.1-23 m,铸造速度为3.8-7 m / min。将不同厚度的板坯倒入铸件中,以3.8-5 m / min的铸造速度生产110-120 mm厚度的板坯,以5的铸造速度生产95-110 mm厚度的板坯-5.9 m / min,以> = 5.9 m / min的铸造速度生产厚度为102 mm的板坯。板坯在50秒内在粗轧机中轧制,其中第一块板坯在6.2分钟内在粗轧机中轧制。在每个轧制阶段,在粗轧机中进行的板坯厚度减少40-55%。中间带材在8秒钟内在精加工粗轧机中轧制。从模具离开并进入板坯引导装置的板坯具有115-125mm的板坯厚度。相对于板坯的纵轴调节板坯引导装置的引导元件,以减小板坯的液芯厚度,其中,根据板坯的材料和/或浇铸速度对引导元件进行调节。 。板坯厚度是:在铸造过程开始时,例如在从模具中排出板坯之后不久,可以动态和准静态地调节板坯厚度;在铸造过程中或在板坯通过板坯导向装置的过程中可调节。在铸坯导引装置的难以冷却的区域,根据vc = K / d 2>,在使用设备进行固定冷却的连续连续运行过程中观察以铸造速度测量的铸坯厚度。每公斤板坯钢3-4升冷却液,其中K是在45500-48900走廊区域中板坯支撑长度17.5 m处的速度因子,适用于确定工厂的铸造速度或板坯厚度。在设备固定连续运行中根据vc = K / d 2>观察在铸造中测量的板坯厚度,以便在中硬要冷却的板坯导向装置区域内使用喷雾装置每公斤板坯使用3-4升冷却液,其中K是在59,9000-64,600的走廊区域中板坯支撑长度17.5 m处的速度因子,适用于确定铸造速度或板坯厚度为植物。在设备固定连续运行中,根据vc = K / d 2>,使用浇铸速度测量的板坯厚度是通过在板坯引导装置的区域内使用喷涂装置进行软化而通过喷涂来冷却的每公斤板坯钢的冷却剂少于2.2升,其中K是在53950-59000走廊区域中板坯支撑长度23 m处的速度因子,适用于确定工厂的铸造速度或板坯厚度。连续或半连续生产热轧钢带的工厂包括独立索赔。

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