JPS6238748A - Direct rolling method for steel ingot - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a method for directly rolling continuously cast slabs.

[Prior art and its problems]

Conventionally, a slab cast by a continuous casting machine is conveyed to a rolling process in the following manner. That is, the cast slab 2 that has been cast 21 by 1 and 2 continuous casting machines shown in FIG. The dummy par is removed from the movement line □ of the slab 2 by the dummy par receiver 4 after cutting the slab. The slab 2 cut to a predetermined length is transported by a trolley 5 to a heating furnace 6 and heated to a predetermined temperature,
Then, it is rolled by a rolling mill 7.

In this way, heating the slab 2 with the heating furnace 6 is as follows:
This is because it takes a long time for the cut slab 2 to be transported to the rolling mill 7, and the temperature of the slab 2 decreases. In addition to this, the cause of the temperature drop in the slab 2 is the natural release of the slab 2 while it passes through the secondary cooling zone 8 of the continuous casting machine 10 and until the slab 2 is cut. There is cold etc.

Therefore, the cut slab 2 can be rolled in a short time □
, and before the slab 2 is cut.
``If the natural cooling of the slab 2 is reduced, the heating furnace 6 of the slab 2 can be reduced.
This eliminates the need for energy saving.

Therefore, there is a desire for a direct rolling method for extruding slabs that eliminates the need for the heating furnace 6 and can save energy, but such a method has not yet been proposed.

[Purpose of the invention]

Accordingly, an object of the present invention is to provide a method for directly rolling continuously cast slabs, which eliminates the need for a heating furnace for the slabs and can save energy.

[Summary of the invention]

This invention provides a heat insulation zone between the secondary cooling zone of the continuous casting machine and the cutting machine, and the cast slab is placed in the casting machine after passing through the secondary cooling zone until it is cut by the cutting machine. The present invention is characterized in that the natural cooling of the slab is reduced, and the slab cut by the cutter is conveyed to a rolling mill at high speed and rolled, thereby saving energy.

[Structure of the invention]

Next, one embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a process diagram showing a continuous cast slab being transported to a rolling mill according to an embodiment of the present invention.

In FIG. 1, the heat insulation zone 9 is provided in the slab movement line between the slab 2 passing through the secondary cooling zone 8 of the continuous casting machine 1 and being cut into a predetermined length by the cutting machine 3. It is being The insulation zone 9 is constituted by a cover that covers the slab 2 and the like. The dummy bar receiver 4 is installed on the downstream side of the cutting machine 3 in the direction of slab movement, and as a result, compared to the case where the dummy bar receiver 4 is installed on the upstream side of the cutting machine 3 in the slab movement direction, Since the moving distance of the slab 2 is shortened, the natural cooling of the slab 2 can be reduced accordingly.

The high-speed conveyance table 10 conveys the slab 2 to the heating furnace 7 at a higher speed than a conventional conveyance table.

This makes it possible to directly roll the continuously cast slab 2 with the rolling mill 7 without heating it with a heating furnace as in the conventional method.

If the rolling capacity of the rolling mill 7 and the casting capacity of the continuous casting machine 1 do not match, a holding furnace 11 is installed in the slab conveyance line between the cutting machine 3 and the rolling mill 7, and the inside of the holding furnace 11 is Temporarily store slab 2.

The holding furnace 11 can of course heat the entire slab like a heating furnace, but its main purpose is to locally heat the ends of the slab, where the temperature tends to drop during rolling. .

In one embodiment of the present invention configured in this way, the slab 2 cast by the continuous casting machine 1 is cut into a predetermined length by the cutting machine 3 without significantly reducing the temperature. The high-temperature slab 2 cut into a predetermined length is transported to the rolling mill 7 by a high-speed transport table 10 (via a holding furnace 11 if necessary) and rolled.

〔Effect of the invention〕

As explained above, according to the present invention, continuous cast slabs can be directly rolled in a rolling mill without being heated in a heating furnace, resulting in extremely useful effects such as significant energy savings. .

[Brief explanation of the drawing]

Fig. 1 is a process diagram showing continuous cast slabs being conveyed to a rolling mill by a conventional method, and Fig. 2 is a process diagram showing continuous cast slabs being conveyed to a rolling mill according to an embodiment of the present invention. FIG. In the drawings, l... Continuous casting machine, 2... Slab, 3... Cutting machine, 4... Dummy barge 5... Cart, bar, 6... Heating furnace,
7... Rolling mill, 8... Secondary cooling zone, 9...
- Heat insulation zone, 10...high speed transfer table, 11...holding furnace.

Claims (1)

[Claims] A heat insulation zone is provided between the secondary cooling zone of the continuous casting machine and the cutting machine, and the slab is heated after passing through the secondary cooling zone until it is cut by the cutting machine. A method for directly rolling continuously cast slabs, characterized in that natural cooling is reduced, and the slabs cut by the cutter are conveyed at high speed to a rolling mill and rolled.