JPS58151909A - Method for conveying slab - Google Patents

Abstract

PURPOSE:To make the best possible use of the heat retained in slabs which do not require blooming in a blooming line used alternately and commonly for continuous casting slabs and ingot materials by retreating the succeeding ingot when the slab arrives at the inlet side of a blooming mill. CONSTITUTION:In a producing line for steel plates wherein a continuous casting plant A, a blooming plant B and a hot rolling plant C are coupled directly, the continuous casting slab (a) from the plant A and the ingot material (b) from a holding furnace 1 are both bloomed with the blooming mill 2. The slab (a) is fed through a hot scarfer 3 and a hot shear 4 to the plant C, and the bloomed slab of the material (b) is fed temporarily to a cooling hearth 7. A slab lifter 8 is provided between the mill 2 and the scarfer 3. When the slab (a) which does not require blooming is fed into the line during the blooming work of the material (b) under working, the material (b) under the work is retreated to above the line by the lifter 8, and the slab (a) is passed preferentially so as to be fed to the plant C. The lifter 8 is brought down thereafter to return the material (b) again in the blooming stage and the work is completed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for conveying slabs in a blooming line which is used alternately for continuous casting slabs and ingot materials.

As shown in Figure 1, in a steel plate production line with a layout in which continuous casting factory A, blooming factory B, and hot rolling factory C are directly connected, continuous casting slabs (
Hereinafter, it is called CC slab. ) processing and ingot material processing, and in the blooming process, CC
Slab α and ingot material are processed alternately. In other words, CC sent from continuous casting factory A
Both the slab α and the ingot material sent out from the soaking furnace 1 are bloomed in a blooming mill 2, surface defects are removed in a hot scarfer 3, and defective parts are cut in a hot scarf 4. The CC slab a is sent to the rough rolling mill B through the heating furnace 5, and the blooming slab of the ingot material is temporarily sent to the cooling bed 7 to be cooled.

In such a blooming process, CC slab a and ingot material are processed alternately, but some CC slabs require blooming and others are processed directly without the need for this. , some materials may be sent to the hot rolling process. However, since the blooming process uses alternating processing with ingot material as mentioned above, C
Even in the case of C slabs, if the above-mentioned slabbing process is in use, the slab cannot be allowed to pass through the blooming process, so it must be allowed to wait on the entrance side of the blooming process. For this reason, the running time of the CC slab becomes long, and even though the CC slab is required to make the most effective use of its own heat, the heat is reduced due to the aforementioned loss time. It was necessary to significantly raise the temperature by reheating in the spreading heating furnace 5.

Therefore, an object of the present invention is to obtain a slab conveying method that can preferentially pass CC slabs that do not require a blooming process, and to eliminate the drawbacks of conventional plate passing lines of this type. .

In the present invention, when the preceding ingot material is in the process of blooming and rolling, a waiting time is required for the following CC slab, and a trapping slab lifter is provided at the location where the waiting time is the longest, and the CC slab is placed at the location where the CC slab arrives. At this point, the preceding impeding material is evacuated from the threading line using a slab lifter.

In the present invention, a slab lifter 8 is installed between the blooming mill 2 and the hot scarfer 3. This slab lifter 8
For example, as shown in FIG. 2, a plurality of fluid cylinders 81 are used as a set, and the retracted slab is lifted and held above the threading line by a hanging beam 82 that is framed together and integrated. It is. When not in use, it is in the lowered position, and the hanging beam 82 is placed between the table rollers and does not interfere with the passage of the slab.

In the method of the present invention, it is not necessary to use a slab lifter if there is no problem in transporting the threaded material.
If an unnecessary CC slab is sent in during the preceding slabbing operation of ingot material, the ingot material being worked on is evacuated to the upper part of the line by the slab lifter 8, and the empty blooming slab is removed. The CC slab is quickly passed through the process and sent to the hot rolling factory. When the threading of the CC slab is completed, the slab lifter 8 is lowered to return the ingot material being processed to the blooming process again to complete the work.

Compared to the implementation of the method of the present invention, the heating time of the CC slab after threading was significantly reduced. In other words, in the conventional method that required waiting time, the heating time after passing through the blooming rolling process required 5 to 6 hours, but by implementing the method of the present invention, the heating time was reduced to 1 to 1.5 hours. It was shortened to . As a result, the time required for rolling and the amount of fuel consumed were significantly reduced, resulting in significant improvements in work efficiency and fuel consumption. Additionally, there is no longer a need to secure a waiting space on the sheet threading line, resulting in a reduction in equipment space.

[Brief explanation of drawings]

Figure 1 is a schematic plan view of a rolling line that directly connects continuous casting, blooming, and hot rolling. FIG. 2 is a schematic perspective view of a slab lifter according to the method of the present invention. 1: Soaking furnace 2: Blooming mill 6: Hot scarf 4: Hot shaver 8: Slurp lifter

Claims (1)

[Claims] In a slab conveying method for a line in which a continuous casting process, a blooming process, and a hot rolling process are directly connected, and the blooming process is alternately used for continuous casting slabs and ingot material, A slab lifter is installed in between, and when the continuous casting slab arrives at the input side of the blooming mill, the ingot material being rolled or after rolling is evacuated upward from the line by the slab lifter, and the continuous casting slab is removed. A slab conveying method characterized by passing the slab first.