JPS5897472A - Treating device for continuously cast ingot under heating - Google Patents

Abstract

PURPOSE:To treat under heating the continuously cast ingots which have varying temp. differences between the central parts end parts based on the results of temp. measurement adequately with min. energy by inserting said ingots into heating (soaking) furnaces having variations in heating capacity for the end parts of the ingots. CONSTITUTION:The temp. differences in the breadthwise directions of the whole C.C. slabs except those which are detected of flaws by a detecting means for hot surface flaws among the ingots (C.C. slabs) cast continuously with a continuous casting machine 1 are measured with a measuring device 5. The C.C. slabs measured 5 of temp. are selected with a transfer 6 and are inserted into any of prescribed heating (soaking) furnaces A, B, C, D constituting a hot ingot selective heater group 2 according to the temp. differences in the transverse direction. The C.C. slabs of which the temps. are made uniform are discharged and are carried by a transfer 7 to a hot rolling stage 4. On the other hand, the C.C. slabs having surface flaws are subjected to surface conditioning after cooling, and are heated to prescribed temp. in an ordinary hot ingot heating furnace 3 via the transfer 6 and a rolls table 8 and are then supplied to the stage 4.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a slab heating (soaking) treatment apparatus for directly hot rolling continuously cast slabs.

If continuously cast slabs (hereinafter referred to as C1C slabs) can be directly hot rolled, the fuel consumption required for heating the C1C slabs in a heating furnace can be reduced, resulting in a large energy-saving effect. (D
Various techniques have been proposed under the name R). This DI
(One of the key points in order to make this possible is to compensate for the temperature difference that occurs at the end of the C0C slab at the slab stage.) However, in reality, C and C slabs vary depending on the type, steel type, and size. Since the systems produced in C are different,
The temperatures at the ends and center of c and c slabs vary in size, and when trying to compensate for the temperature of the ends of these C0C slabs in the same heating (soaking) furnace, the heating (soaking) standard is Although it is normal to set the maximum heating, in the case of C1C slabs with small temperature differences between the ends and the center of C and C slabs, and small C0C slabs, heating may be unnecessary (uniform heating). As a result, there was a problem in terms of energy saving and product metalane loss, which increased.

The present invention solves the above problems, achieves energy saving, and advantageously realizes a finished metallurgy.

The present invention provides a heating (soaking) treatment device for heating.

According to the present invention, the temperature of all C and C slabs produced by one or more C6C machines is measured, except for those with surface defects. This temperature measurement measures the temperature difference between the center and end of the C0C slab, and based on this temperature measurement result, each C1C slab is heated by the missing hot piece selective heating (uniform heating) device group. Selective heating (uniform heating) is performed. This hot piece selective heating (uniform heating) equipment group is composed of an assembly of multiple heating (uniform heating) furnaces of two or more units, and each furnace is of the type in which C and C slabs are inserted in the longitudinal direction. This is different from the conventional type, which is inserted in the width direction and heated. In other words, the temperature drop in the width direction of the C1C slab increases as the dissipated heat reaches the ends in the width direction, and the resulting temperature difference is heated (uniform heating).
In order to recover more quickly, the best method is to heat the ends intensively, and insert the VcC, C slab in the longitudinal direction so that the widthwise ends are near the heat source.

Furthermore, each furnace has different heating (soaking) conditions, that is, the ability to raise the temperature at the ends of the C and C slabs.

Based on the temperature measurement results of the C1C slabs mentioned above, the C and C slabs, which have a large temperature difference between the center and the ends, are placed in a heating (soaking) furnace with a large temperature raising capacity at the ends, and the temperature is The C0C slab with a small difference is inserted into a heating (soaking) furnace with a small temperature raising capacity at the end. With this configuration, each slab is appropriately heated with the minimum amount of energy depending on the temperature state of the slab, and as a result, the energy saving effect is sufficiently exhibited and it is also advantageous in terms of metallurgy.

Further, this hot piece selective heating (soaking) device group can also serve as a buffer furnace that absorbs the difference in capacity between the C and C processes and the hot rolling process.

In addition, the heating means in the hot piece selective heating (soaking) device group is as follows:
Any type such as a gas burner type, induction type or electric heating type can be used.

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

1 is a continuous casting machine, 2 is a group of four hot piece selective heating (soaking) devices consisting of A, B, C, and D, 3 is a cold piece heating furnace, and 4 is a hot rolling facility. 5 is a temperature measuring device that measures the temperature difference in the width direction of the entire C and C slabs, excluding the C0C slab in which flaws have been detected by the hot surface flaw detection means (not shown);
The 9C slab is transported by a transfer 6 and placed in predetermined heating (soaking) furnaces A, B, C, and I according to the temperature difference in the middle direction.
) and heated (soaked) for a predetermined time to make the temperature uniform. The C and C slabs are extracted and conveyed to the hot rolling process 4 by a transfer 7.

On the other hand, the surface of the C1C slab with surface defects is treated after being cooled, passed through a transfer 6 and a roller table 8, and then heated to a predetermined temperature in an ordinary cold piece heating furnace 3.

Note that 9 in the figure indicates a direct feed line, and the C0C slab having temperature uniformity that allows direct hot rolling is directly hot rolled through this line 9. The above transfer 6, hot piece heating furnace group 2. A transfer 7 and a cold piece heating furnace 3Iet are sequentially arranged along this direct feed line 9. Further, although the present invention has shown an example in which a cold piece heating furnace is provided, it is not necessarily essential.

To give a specific example, if the temperature difference (maximum) between the edge and center of the width direction temperature measuring device 5 is 40 to 50 degrees, there is no need for heating (soaking) and the temperature is directly conveyed through the direct feed line 9. It is hot rolled in a hot rolling facility 4. If the temperature difference is larger than that, the temperature difference will be as shown in Table 1 (A, B).

C and J) Selectively use P.

Table 1 In Table 1, when there are many C1C slabs to be treated in Furnace A and few C1C slabs to be treated in Furnace B, the same treatment as in Furnace A can be performed in Furnace B. Also, in the furnace, it is desirable to heat the entire C9C slab. As for the heating means, a single burner type is generally employed, but induction heating may be employed for the B furnace or C furnace.

[Brief explanation of drawings]

FIG. 1 is a layout diagram showing an embodiment of the present invention. l... Continuous casting machine, 2... Hot piece selective heating device group, 3
... cold piece heating furnace, 4 ... hot rolling process, 5 ... width direction radiation measuring device. Patent Applicant Agent 7- Figure 1 381-

Claims (1)

[Claims] A continuous casting machine, a temperature measuring device that measures the force direction temperature of the slab cast by this continuous casting machine, and a hot slab selective heating (
The plurality of heating (uniform heating) furnaces that constitute the hot piece selective heating (uniform heating) equipment group are designed to heat (uniform heat) the slab by inserting it in the longitudinal direction. In addition, each heating (soaking) furnace has different heating (soaking) conditions, and the above-mentioned plurality of heating (soaking) furnaces are selected and used based on the temperature measurement results of the temperature measuring device. Features: Heat treatment equipment for continuously cast slabs.