JPS59156538A - Production of clad billet by continuous casting - Google Patents

Abstract

PURPOSE:To cast continuously and inexpensively a clad billet by supplying perpendicularly and continuously a cladding material plate into a vertical mold provided right under a tundish, charging simultaneously the molten steel in the tundish into the mold between the cladding material plates and drawing the billet. CONSTITUTION:A cladding material plate 6 is perpendicularly and continuously supplied into a vertical mold 3 provided right under a tundish 1 in a way so as to contact the inside surface of the mold 3. At the same instant, the molten steel 14 in the tundish 1 is charged through the plate 6 into the mold 3. An unsolidified clad billet 10 deposited with the plate 6 on the outside surface thereof is continuously drawn from the inside of the mold 3. The billet 10 is then cooled and the clad billet is produced.

Description

DETAILED DESCRIPTION OF THE INVENTION In the present invention, a clad plate of a predetermined thickness such as a stainless steel plate is crimped by rolling to a clad slab by continuous casting.

However, the above-mentioned manufacturing method takes one hour and is time-consuming, leading to an increase in the manufacturing cost of the clad steel sheet.

Therefore, there has been a desire to develop a method for producing clad steel sheets at low cost, but there is currently no such method.

The present invention provides a clad steel plate at low cost from the above-mentioned viewpoint.

At the same time, a cladding material plate is continuously fed vertically into a vertical mold provided directly below the tundish so as to contact the inner surface of the mold.

The molten steel in the tundish is injected into the mold through the clad material plate, and from within the mold, an unsolidified clad slab t with the clad material plate welded to the outer surface is produced.
, Continuously pull out, you fellow.

The method is characterized in that a clad slab is cast by cooling the unsolidified clad slab.

One embodiment of the method of this invention will be explained with reference to the drawings.

FIG. 1 is a side sectional view showing one embodiment of the method of the present invention.

In Figure 1, 1 is a tundish, 2 is an injection nozzle fixed vertically to the bottom of the tundish L, 3 is a rectangular vertical mold installed directly below the tundish 1, and 4 is on the inner surface of the long side of the mold 3. A pair of long-side clad material plates 4 are continuously supplied perpendicularly to the straightening rolls 5 for bending each of the pair of long-side clad material plates 4 at right angles.

Reference numeral 6 denotes a pair of short-side cladding material plates that are continuously supplied perpendicularly to the inner surface of the short-side side of the mold 3 in synchronization with the long-side cladding material plates 4; 7, a pair of short-side cladding material plates; A straightening roll 8 for bending each of the side cladding plates 6 at right angles is heated in advance to a predetermined temperature in order to straighten each of the pair of long side cladding plates 4 and to facilitate welding with the molten steel 14. 9 is a welding machine for welding the clad plate 6 assembled into a rectangular tube shape and moving downward and a part of each 4° corner; 1. o
i It was pulled vertically downward from the upper mold. 2 unsolidified slabs with cladding plates 4 and 6 welded to their outer surfaces;
11 was provided below the mold 3.

pinch rolls for holding the unsolidified clad slab 10 and pulling it out vertically below the mold 3;
3 is a cooling nozzle for cooling the unsolidified clad slab 9.

The heater 8 may be installed to preheat the short side cladding material plate 6.

The clad plate to be welded to the unsolidified molten steel may only have long sides.

A pair of long side and short side clad material plates 6 and 4, which have been preheated by a heater 8, are moved to straightening rolls 5 and 7.
are forcibly bent at a right angle and assembled into a rectangular tube shape, and in this state a part of each corner is continuously welded by a welding machine 9.

The rectangular cylindrical cladding plates 6 and 4, each of which is partially welded at each corner, are guided into the mold 3. At the same time,
Molten steel 14 in tundish 1 is injected into mold 3 via injection nozzle 2. When the molten steel 14 is cast into the mold 3, it is welded to the clad material plates 6 and 4, and then immediately cooled, resulting in an unsolidified clad slab 1.
0 is formed.

The unsolidified clad slab 1o is pulled vertically downward from the mold 3 by pinch rolls 11.

The unsolidified slab 10 pulled out from the mold 3 is cooled by cooling water from the cooling nozzle 13, and finally becomes a clad slab whose entire circumference is covered with a clad plate.

By rolling the thus produced clad slab to a desired thickness, a clad steel plate can be easily produced.

In addition, if the thickness of the clad slab is reduced and casting is performed,
It is also possible to directly produce a clad steel plate without rolling the clad slab.

As explained above, according to the present invention, a clad steel plate can be manufactured easily and in a short time, so that the manufacturing cost of a clad steel plate can be significantly reduced.
This has the useful effect of

[Brief explanation of drawings]

FIG. 1 is a side sectional view showing one embodiment of the method of the present invention. In the drawing. 1... Tanditshu 2... Injection nozzle 3...
- Mold 4... Long side clad material plate, 5, 7... Straightening roll 6... Short side clad material plate 8... Heater 9... Welding machine 10...
Unsolidified clad slab 11...pinch roll 12...support roll 13...cooling nozzle 14...molten steel applicant
Nippon Kokan Co., Ltd.

Claims (1)

[Scope of Claims] At the same time, a cladding material plate is vertically and continuously fed into a vertical mold that is disposed directly below a tundish so as to contact the inner surface of the mold. The molten steel in the tundish is injected into the mold through the clad plate, and the unsolidified clad slab with the clad plate welded to its outer surface is continuously pulled out from the mold. The method is characterized in that a clad slab is cast by cooling the unsolidified clad slab. A method for manufacturing clad slabs by continuous casting.