JPH04231150A - Treating device for continuous cast thin slab - 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]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to processing processes ranging from continuous casting of thin slabs to product winding.

0002

[Prior Art] Conventionally, for example, Japanese Patent Application Laid-Open No. 1-83352
As disclosed in the publication, in order to reduce the number of rolling steps, thin slabs are continuously cast using twin casting belts, finish rolling is performed as a post-process to homogenize the predetermined thickness and surface condition, and then coiled A winding method is adopted.

[0003] However, since the continuous thin slab cast piece obtained by this method has a relatively thin wall thickness, it is not possible to obtain a large rolling reduction ratio in the finish rolling stage, and as a result, it has the disadvantage that a good surface condition cannot be obtained. There is.

[0004] Furthermore, it is necessary to remove the increased specific surface area as scale in the final finishing step, which causes a problem in that the yield decreases by that amount.

[0005]

OBJECTS TO BE SOLVED BY THE INVENTION The problem to be solved by the present invention is to solve the problem caused by the need to reduce the reduction ratio in finish rolling in the processing process from continuous casting of thin slabs to product winding. It is an object of the present invention to provide a processing device for producing a thin plate having a surface condition equivalent to that of a conventional rolled thin plate from a thin slab obtained by continuous casting.

[0006]

[Means for Solving the Problems] The present invention provides, in equipment for finish rolling continuously cast thin slabs, surface conditioning with a leveler before the finish rolling mill, followed by heat treatment in a non-oxidizing atmosphere. It is characterized by the fact that it is equipped with facilities for

[0007] Before performing surface adjustment using this leveler, thickness adjustment may be performed using a multi-high rolling mill.

[0008] It is preferable that the leveler for surface conditioning has an ability equal to or greater than that of a leveler normally used. Bending using a leveler has the effect of improving surface properties and removing scale.

[0009]

[Effect] After surface conditioning with a leveler, heating in a non-oxidizing atmosphere makes the grains finer and more uniform, resulting in a normal rolled plate finish even if the rolling reduction in the subsequent finish rolling is small. It becomes possible to obtain surface uniformity and gloss comparable to rolling.

[0010] The heating temperature for making the crystal grains finer and more uniform in this continuously cast thin slab plate is as shown in Fig. 1.
This is achieved by heating at 800 to 1400°C for 5 minutes to 3 hours, and in order to make the effect of this heat treatment noticeable, as shown in Figure 2, before flattening with a leveler, a multi-high rolling mill is used. It is preferable to perform rolling at a rolling reduction of about 5 to 30%.

[0011] Therefore, normally, the following steps are adopted: continuous casting thin slab, rolling with a multi-stage rolling mill, cutting, surface conditioning with a leveler, heating with a non-oxidizing furnace, finishing rolling, high-speed shearing, and winding.

0012

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 3 is a diagram showing an example of the arrangement of a continuous processing apparatus for continuous casting thin slab cast pieces according to the present invention.

In the figure, reference numeral 1 indicates a continuous casting apparatus using, for example, twin casting belts. Following this continuous casting device 1, two in-line reduction devices 2, a shear 3, a leveler 4, and a non-oxidizing furnace 5 are arranged, and in the final step, two four-high finishing mills 6, a high-speed shear 7, and a winding A removing machine 8 is arranged.

In the figure, a leveler 4 and a non-oxidizing furnace 5 are integrally formed, and the inert gas atmosphere of the non-oxidizing furnace 5 is formed as a processing atmosphere for the leveler 4.

[0015]

[Effects of the Invention] The following effects can be achieved by the present invention.

[0016] Even in thin slabs obtained by continuous casting, good surface quality can be obtained by finish rolling.

[0017] Scale formation is reduced and yield is improved.

(2) Since the scale removal step using high-pressure water, which is normally placed at the entrance of the finishing rolling mill, can be omitted, the heating temperature of the treated slab can be lowered, and the thermal energy consumed can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the relationship between heating conditions in a non-oxidizing atmosphere and crystal grain refinement.

FIG. 2 is a diagram showing the relationship between rolling reduction and scale removal rate by a multi-high rolling mill.

FIG. 3 is a diagram showing an example of the arrangement of a continuous processing apparatus for continuous casting thin slab cast pieces according to the present invention.

[Explanation of symbols]

1 Continuous casting equipment 2 Inline reduction device 3 Shah 4 Leveler 5　Non-oxidation furnace 6 Finishing rolling mill 7 High speed shear 8 Winder

Claims (1)

[Claims] 1. A processing device for continuously cast thin slabs, in which a leveler device and a non-oxidizing atmosphere furnace are arranged in front of a finishing rolling mill.