JPS5852466B2 - How to manufacture clad steel - Google Patents

Description

[Detailed description of the invention] The present invention relates to a method for manufacturing clad steel.

Metals have various properties such as toughness, elasticity, corrosion resistance, and electromagnetic properties, but there are few cases where metals have all of these properties.

Therefore, the Claddening method has been proposed as a method for exhibiting two or more properties.

This method involves combining two or more types of metals, but the conventional method has problems such as low productivity, easy corrosion between the combined metals, and cracking.

Therefore, the present invention provides a method for manufacturing clad steel that eliminates these problems.

An embodiment of the present invention will be described below with reference to the drawings.

First, an example of the manufacturing method for clad steel material is shown in Figures 1 to 5.
This will be explained based on the figure and FIG. 9.

Reference numeral 1 denotes a conveyance path for a slab 2 in a continuous casting facility consisting of a large number of rollers 10, 40 a mold, 41 a tundish, and 3 a moving vehicle disposed at an appropriate position above the freezing point of the molten metal on the conveyance path 1. Therefore, it can freely move back and forth within a certain range along the conveyance path 1.

This mobile vehicle 3 is provided with the following:

That is, a pair of clamp boxes 4 and 5 that loosely fit onto the slab 2 and clamp the slab 2 by means of a cylinder device installed inside, and clamp boxes 4 and 5 that are placed vertically with the slab 2 between them. A pair of large punches 6 are arranged, a pair of small punches 7 are also arranged on the left and right sides of the slab 2 between the double lamp boxes 4 and 5, and a slab 2 is placed between the double lamp boxes 4 and 5. A cooling water supply pipe 8 and a nozzle 9 are provided for spraying cooling water toward.

Note that the rolls 10 constituting the slab conveyance path 1 in the moving section of the mobile vehicle 3 are designed to escape to the outside as appropriate, so that they do not interfere with the movement of the mobile vehicle 3.

In the above configuration, first, as shown in FIG. 1, the moving vehicle 3 is opposed to the place where the slab 2 that is being transported in the direction of arrow A is to be cut, and the moving vehicle 3 is moved integrally with the slab 2 at the same speed. , and the slab 2 is clamped by both clamp boxes 4 and 5.

Next, as shown in FIG. 2, a large punch 6 is pressed against the slab 2 from above and below.

Then, as shown in FIG. 3, the upper part 11a and lower part 11b of the solidified outer shell 11 of the slab 2 are depressed and bonded to each other.

Next, as shown in FIG. 4, a small punch 7 is pressed against the slab 2 from the left and right.

Then, both sides 11c and 11d of the solidified outer shell 11 are recessed and bonded to the upper part 11a and the lower part 11b of the solidified outer shell 11.

As a result, the molten metal 12 within the solidified outer shell 11 is substantially divided.

Next, cooling water is sprayed from the nozzle 9 to cool the recessed portion of the solidified outer shell 11, completely solidifying the molten metal 12 in this portion, and completely dividing the molten metal 12.

Next, the punch 6.7 is separated from the slab 2, the clamps by the clamp boxes 4 and 5 are released, and the moving vehicle 3 is moved in the direction opposite to the direction of arrow A, and the next part of the slab 2 to be cut is cut. correspond to

And the place 13 dented by the above punch 6.7
The cut slab 2a is cut by an arc (not shown) of a cutter 42 that can move integrally with the slab 2, thereby obtaining a cut slab 2a containing the molten metal 12 therein as shown in FIG.

The cut slab 2a is placed in a heat insulator 43 and kept warm.

Note that instead of cutting by arc, the solidified outer shell 11 may be cut by strongly pressing the punch 6.7 against the solidified outer shell 11 from the state shown in FIGS. 2 and 4.

A method for manufacturing clad steel using the cut slab 2a obtained by the above method will be explained with reference to FIGS. 6 to 8 and 9.

First, the cut slab 2a taken out from the heat insulator 43 is placed in the U-shaped frame 15 in a horizontal state as shown by the imaginary line in FIG.
After the top cover 15a is attached to the iron frame 15, the frame 15 is stood up as shown in solid lines in FIG. 6 and in FIG.

Next, as shown in FIG. 8a, the upper end 1 of the solidified outer shell 11 (for example, stainless steel) is
Drill a hole 19 in 7 with a drill 18.

Next, as shown in FIG.
The flow port 22 at the tip faces into the outer shell 11.

Next, with the valve 21 closed, the U-shaped frame 15 is
The cut slab 2a is turned upside down by rotating it by 80 degrees.

Next, as shown in FIG. 8C, the bottom plate 15b of the square U-shaped frame 15
A hole is made with a drill 18 through the hole 23 in the upper end 24 of the outer shell 11 (the end opposite to the above-mentioned upper end 17), and the lower end is pointed inside this hole. At the same time, the injection nozzle 25 whose upper end is funnel-shaped is inserted so that the flow port 26 at the lower end of the nozzle 25 faces into the outer shell 11.

Next, as shown in FIG. 8d, a weighing machine 27 with a load cell 28 is placed below the cut slab 2a, a molten metal container 29 is placed on the weighing surface of the weighing machine 27, and the cut slab A ladle 3 in which 3 different types of molten metal (for example, mild steel) are stored above 2.
yields 0.

Next, the valve 33 of the nozzle 32 at the lower end of the ladle 30 is opened, and the dissimilar molten metal 31 is poured into the injection nozzle 2 on the cut slab 2a.
5 and injected into the solidified shell 11 through the flow hole 26 of the nozzle 25.

At the same time, the valve 21 of the discharge nozzle 20 is opened to discharge the molten metal 12 inside the solidified shell 11 into the container 29.

In this way, the molten metal 12 is discharged from the solidified outer shell 11, and at the same time, the same amount of dissimilar molten metal 31 as that discharged is discharged.
is injected into the solidified outer shell 11, thereby changing the material inside the solidified outer shell 11.

In this case, the amount of molten metal 12 in the solidified outer shell 11 is estimated in advance, and the weight of the molten metal 12 discharged from the solidified outer shell 11 is weighed by the weighing machine 27, and the weight value is determined. When the estimated value is reached, both valves 21 and 33 are closed.

Then, the inside of the solidified outer shell 11 is completely filled with the dissimilar molten metal 31, and the dissimilar molten metal 31 does not flow into the container 29, which is efficient.

Note that the clad steel manufactured in this manner may be naturally cooled in a standing state, but it may also be possible to start water cooling from the bottom and gradually advance the cooling upward.

In this case, since the dissimilar molten metal 31 inside generates gas, a gas vent hole is formed at the upper end of the clad steel.

Next, as shown at the right end of FIG. 9, the clad steel 2a is taken out of the U-shaped frame 15 and transported to a predetermined location by the roller table 44.

In the above embodiment, the hole is drilled in the solidified shell using the drill 18, but teeth may be formed on the outer peripheral surface of the nozzle 20, 25, and the hole may be drilled by the nozzle 20, 25.

As described above, according to the present invention, it is possible to manufacture a clad steel in which the core material is made of mild steel and the outer skin is made of stainless steel, thereby providing a steel material that does not rust, is sticky, and is inexpensive. It is something that can be done.

In addition, since molten metal is extracted from the outer shell and molten metal of a different type is injected into the outer shell at the same time, the inner peripheral surface of the outer shell does not come in contact with the outside air, and the core material made of different molten metals and the outer shell do not come into contact with the outside air. There is no corrosion between the shell and the shell, and there is no risk of cracking.

[BRIEF DESCRIPTION OF THE DRAWINGS] The drawings show one embodiment of the present invention, FIGS. 1 and 2 are schematic front views showing the manufacturing procedure of the clad steel material, and FIGS. 3 and 4 show the solidified outer shell. A in Figure 2 shows the denting procedure.
-A cross-sectional view along line A; Figure 5 is a perspective view of the cut slab; Figure 6 is a perspective view of the cut slab;
8 to 8 show an embodiment of the present invention, FIG. 6 is a side view showing the procedure for standing up a cut slab, FIG. 7 is a partially cutaway front view of the same procedure, and FIG. 8 a = d is a vertical cross-sectional view showing the procedure for pouring different types of molten metal, and FIG. 9 is an explanatory view of the manufacturing process of clad steel. 2... Slab, 2a... Cut slab (steel material), 11... Outer shell, 12... Molten metal, 18...・Drill, 19... Hole, 20
... Discharge nozzle, 25 ... Injection nozzle, 21, 33 ... Valve, 29 ... Molten metal receiver, melt amount, 30 ...・Ladle, 31...
...Dissimilar molten metal.

Claims (1)

[Claims] 1. A movable body is placed to face the part to be cut at a position above the solidification point of the molten metal of the slab pulled out of the mold of the continuous casting equipment, and this movable body is moved integrally with the slab at the same speed. The cast slab is dented using a provided punch to bond the solidified outer shells together, and then cooling water is sprayed from a nozzle provided on the moving body to completely solidify the dented portion of the solidified outer shell. Next, cut the recessed part to form a cut slab, insert a discharge nozzle into the solidified shell from the lower end of the cut slab, and insert an injection nozzle into the solidified shell from the upper end of the cut slab. , characterized in that a dissimilar molten metal is injected into the solidified outer shell through an injection nozzle, and at the same time, a discharge nozzle is opened to discharge the molten metal within the solidified outer shell, thereby replacing the inside of the solidified outer shell with a dissimilar metal. Manufacturing method of clad steel.