JPS5825802A - Hot rolling installation - 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] This invention relates to hot rolling equipment.

Blooming mill 1! ! When manufacturing slabs, the dimensions of the slab are generally determined by taking into consideration the finished dimensions of the coil.When hot rolling slabs using a normal arc of blooming, the width of the rolling equipment is set at 50. A small value of ~60×1i degrees was sufficient.

That is, the slab which is cast as a solid arc or continuously cast is used in the first process of the hot pressure section. ! 1 before charging into a heating furnace
Slabs with various step dimensions are stored in the storage area. In hot rolling, the normal method of straightening the slab is to roll it in order from the widest part to the narrowest part of the slab. This rounding prevents deterioration of the board profile, shape, and surface quality.

However, in recent years, continuous casting has become popular, and the improvement in production efficiency that comes with continuous casting has become a superimposed factor.

One of the ways to improve production efficiency (manufacturing capacity) using continuous casting is to maintain constant casting dimensions and perform continuous high-speed casting.

However, the requirements for the width of the H-Kan area products are 11 units, and the materials in these aggregated slabs must be rolled or widened in 1 units in a normal arc. .

With and ζ, the amount of width increase and width reduction in the conventional technology is 50 to 60
■However, if you try to operate the newly installed rolling roll within the allowable range from the product plate profile, shape, and quality, it will cost 500~
At a rolling amount of about 800'I''ON, it is necessary to change to a polished roll and roll again.

In the rolling operation, the rolling mill must be stopped during the roll change, which does not reduce the operating rate of the rolling mill.
Due to the rearrangement of rolls by small-volume rolling, a large amount of wear is caused by regrinding of the rolls, and from both of these points of view, this operating method has problems in terms of resource and energy conservation.

HiL71) SotS! ! In order to improve production efficiency using the continuous casting method, the dimensions of the slab during casting are kept as constant as possible, and continuous high-speed drawing is performed. It has become necessary to carry out medium rolling or offering.

In addition, in recent years, in order to further promote energy conservation, continuous casting equipment and hot rolling equipment have been deployed continuously, and slabs produced by continuous casting are charged into hot rolling heating furnaces and reheated within a short time. Even if a method is adopted in which the temperature of the slab during heating and extraction in a hot rolling heating furnace is lowered to about 1100°C (conventionally 120.0°C or higher), this is the mainstream for hot straight arc products. It is known that material deterioration of low [C] aluminum killed steel due to insufficient MN solid solution can be prevented.

However, in conventional hot rolling equipment trains, it is not sufficient to reduce the temperature drop, and low [C] aluminum killed steel 04. It was difficult to perform finish rolling at another material superposition temperature.

The present invention is one of the recent technological trends mentioned above! IIIK
This was developed in order to provide hot rolling equipment that allows for wide width adjustment and reduces temperature drop.

An embodiment of the present invention will be described below based on the drawings.

In the figure, 1 is the details of the rough rolling mill, 2 is the finishing rolling mill group, 3 is the 1st composting machine,
4 is a heating furnace. The first stand 11 on the extraction side of the heating furnace 4 of the rough land machine evaluation 1 is the vertical rolling mill r1. Horizontal rolling mill I3
．． The vertical mills R and R are arranged in tandem in this order to form a row of nine rough rolling mills. This first stand 11 performs several passes of dog-bone rolling of the system slab as necessary.
The stand 12 is a normal vertical rolling mill R, a horizontal rolling mill I,
It is composed of. The third stand 13 consists of a vertical rolling mill r4 and a horizontal rolling mill I, and is a reversible rolling mill. Reverse rolling is performed here to prevent a drop in temperature of the slab. The fourth stand 14 and the fifth stand 15 are arranged in tandem to suppress a temperature drop in the slab. In order to suppress temperature drop, it is necessary to arrange at least two final stands in tandem.

In the above configuration, the slab extracted from the heating furnace 4 is rolled in the first rolling mill 11 in an appropriate number of passes to form a dog bone. As a result, there is no change in the thickness of the steel slab, and it does not become thinner. Next, the dogbone portion is rolled in the second stand 12, and reverse rolled several passes as necessary in the third stand 13 to perform horizontal reduction and fine width adjustment. Since the thickness of the slab becomes thinner for the first time in the third stand 13, the temperature drop until reaching the third stand is small. Further, since the third stand 13 is capable of reverse rolling, this also prevents a drop in temperature.

In addition, the fourth stand 14 and the fifth stand 15 are rounded and arranged in tandem, so that the temperature drop is effectively suppressed.

As explained above, in the present invention, it is possible to widen the width with the first stand, and moreover, the horizontal reduction is performed on the downstream side, and the Since at least two of the final stands are arranged in tandem, a drop in the temperature of the slab can be effectively prevented.

BRIEF DESCRIPTION OF THE DRAWINGS The drawing is a layout diagram of a hot rolling facility according to the present invention. 1...-- Rough rolling mill group, 2----- Finishing rolling mill group,
3-...Hoisting machine, 4-...Heating furnace, 11-1 1st
゜Stand, 12---...Second stand, 13---
-3rd stand, 14---・4th stand, 15...
...--5th stand. Applicant: Nippon Kokan Kinsha Co., Ltd. Inventor: Isao Taniguchi

Claims (1)

[Claims] Rough rolling mill group and this Kl! <In a hot rolling facility consisting of a finishing rolling mill group and a winding mill, a vertical rolling mill, a horizontal rolling mill, and a vertical rolling mill are arranged in tandem on the first stand on the heating furnace extraction side of the rough rolling mill group. A row of rolling mills is arranged, at least one of the downstream roughing mills is a reversible roughing mill, and at least two final stands are arranged in tandem on the east.1. Hot rolling equipment characterized by +.