JPS5947050A - Method and device for horizontal continuous casting - Google Patents

Abstract

PURPOSE:To cast horizontally and continuously a billet having good quality without central segregation by cooling only the bottom surface of the molten metal moving roughly horizontally on an endless belt with cooling water nozzles thereby soidifying the metal unidirectionally from the bottom to the top surface. CONSTITUTION:The molten metal 2 in a vessel metal 2 in a vessel 4 is supplied by electromagnetic pumps 5, 5' gently and uniformly onto an endless belt 1 at a constant flow through a gate 3. The traveling speed of the belt 1 is adjusted in synchronization with the charging speed to maintain the thickness of the metal 2 constant. The static pressure of the metal 2 is supported by a support roll group 10 and the side parts thereof are supported endlessly by side wall means 13, 13' traveling in synchronization with the belt 1. The metal 2 on the belt 1 is cooled from the bottom surface by a water cooling nozzle 12 mounted to a piping 11 provided between the support rolls 10, and a heat insulating material 6 is sprayed to the top surface thereof. The solidified metal 2 is removed of the material 6 by a scraper 7 and is then scarfed of impurities on the surface with a hot scarfer 9.

Description

[Detailed description of the invention] The present invention relates to a horizontal continuous casting method and apparatus.

More specifically, the present invention relates to a horizontal continuous casting method and apparatus for solidifying molten metal in one direction to produce slabs free from center segregation.

In the conventional continuous casting method, the slab is basically cooled and solidified from two opposing directions. Therefore, it is inevitable that segregation will be formed on the center surface of the slab. This center segregation is a major cause of material deterioration, and efforts have been made in manufacturing to overcome this problem. Examples of yield deterioration include hydrogen-induced cracking in line pipe steel, separation resulting in a decrease in ruby value in rolled material, or weld cracking. There are inspection defects due to die checking at the end of the Tsujinobu Shrine.

Furthermore, due to center boss 1 city due to center unevenness, etc., it is necessary to press the slab by rolling in the next rolling process, so the rolling reduction ratio of the slab must be 5 or more. For this reason, extremely thick materials cannot be manufactured using continuous casting.On the other hand, since the thickness of the slab is the same as that of the finished product, the slab dehydrogenation rate is also low. Of course it will be lower.

In order to reduce the center segregation, it is possible to increase the cooling rate by adding a coolant such as iron 5) or a crystal generating nucleus, or to reduce the molten metal in the mold to an ultra-ia'7 Vibration on the skin
In addition, efforts were made to promote the impurity rLl: and to accelerate the growth of crystals. Furthermore, in case of casting, 1.5.1 continuous IJ to prevent bulging of the piece.
Surface support with i' glue 1/-taen 1- or easy
Melting IIMI in Ha! He was performing electromagnetic work on metals, or lightly rolling down slabs whose centers were molten using a method of melting. However, in all of the conventional methods, since the slab is solidified from the 29 soil Σ1 side, the problem of internal segregation cannot be fundamentally resolved, and at the same time, the slab components are made into high-quality quilts, etc. This was necessary.

Furthermore, conventionally, continuous casting was done using a fixed truss Q! I is ten-ryu, and the enlightenment between the mold and the slab is carried out using oscillations such as 9th oscillation, and the oscillation creates small wave dog irregularities (oscillation marks) on the surface of the finished product. This invention is a method to fundamentally solve the problem of internal segregation, especially center segregation and center porosity, by eliminating the oscillation marks and surface cracks at one point. The purpose is to provide

According to the present invention, while the molten metal is continuously transferred horizontally, only the lower surface of the layer of the molten metal is cooled 1 to perform unidirectional solidification from the lower surface to the upper surface. A casting method is provided.

Furthermore, according to the present invention, the upper part includes an endless heald running in the water IF, a weir provided near the upstream end of one part of the endless belt, and the endless belt. A pair of side wall means running on both sides of the upper portion in synchronization with the running of the belt, and an upper opening mold defined by the upper portion of the endless belt, the end weir and the pair of side wall means are filled with molten metal. There is provided a horizontal continuous casting apparatus characterized by comprising means for supplying hot water, and means for cooling the upper part of the endless heald from its lower surface.

According to a preferred embodiment of the present invention, the upper part of the endless heald is arranged to be inclined upward at an angle of 10 degrees or less in the running direction, thereby facilitating the thicker gli, I4'h of the spinner J1.

Furthermore, according to a preferred embodiment of the present invention, jlj%η1
1.1 To prevent cooling of the molten metal () on the heald from the sides and soil surface, '/a IM: Apply 1 layer of (λ1 heat treatment) to the metal surface or heat the side wall means. good.

Furthermore, according to the present invention, 1iL is used for the 11-face line of the cast slab after solidification, and 5) the t bar contains 6hJ *ffl + impurities) Ji;
remove. D) Impurity Q) layer is 5 10mm'i
Since there are two, it is easier to use normal
, two removal gokiru.

The method of the present invention is to uniformly distribute 4 pieces in the force direction in the slab.
It is necessary to supply hot water at
JX needs to be reduced. As a secondary hot water supply means, the L flow rate control is relatively easy and the power of the electric power θ2,1ζ is very desirable. However, the water level is ->L
L (using a double 5ill!ffi device or a pot rolling device) is a hot water supply stage).

If the molten metal is unmelted and 1 held, the top surface receives the molten metal.T:
rr+7, J: riiro Jill sa, t+, lemo(7
) '(: rb ri, reward!: Ha sex °C heat guidance 1!I
g O) J'J: b (necessary, usually about 1
mm thickness resistance f:! The U1 heavy load is received by the Zaboto I call which comes into contact with the back side of the heald. (It is preferable to install a water cooling nozzle between the J and boat rolls and cool the bells 1 to 2 from the bottom. In addition, a caterpillar type belt with a thickness of about 10 mm is used.
The space between the caterpillars must be made as small as possible, and the caterpillars must have good thermal conductivity, but because they are relatively strong, the pitch of the Sabo 1st call can be widened. The amount of cooling water flowing from the bottom can be increased.

Further, the side wall means used in the apparatus of the present invention may be heated as described above to prevent cooling of the slab from the side, but in this case, the side wall means must be made of a sufficiently heat-resistant material. be.

Hereinafter, the present invention will be explained by way of embodiments with reference to the accompanying drawings.

In the apparatus of the present invention, which is schematically shown in FIG. Container 4 is connected. A 4,1 electric pump 5.5' is installed in @3, and the melt lW in container 3 is '! (! (Poured gently onto Held 1. Synchronized with the pouring speed - C endless bell) I
The running speed of is adjusted, a constant V-shaped slab is obtained, and -1) there is no relative movement between the molten metal 2 and the end heald 1; On the other hand, molten metal 2 on bell 1-1
The lateral support may be provided by side wall means as described below with reference to FIG. 2, or by electric .theta. hooks.

The molten metal 2 on the bells 1 and 1 is cooled from the 1st side through the bells 1 and 1, and at the same time, the molten metal 2 on the 2nd side is held. +
/I'l b is placed on 11. When the upper surface of the molten metal 2 is solidified, the heat insulating agent 6 is removed by the scraper 7 at the stage 7, the gold WJ 2 runs on the subsequent roller table 8, and when it is completely solidified, it is solidified by the Botsker scraper 9. The impurities concentrated on the upper surface of the metal 2 are removed.

The solidified metal 2 is cut into slabs of appropriate length by an appropriate cutting means (not shown).

FIG. 2 shows 4゛f,
111 is shown.

It will be done. The belt 1 is made of heat-resistant steel, such as high Mn-Cr steel, and has Cr plating hl on its upper surface. On the back side of belt 1, there are 50 mm staggered lines in the middle force direction.
In a pinch, the Zabo I-roll 1o is placed, thereby supporting the static pressure of the molten metal 2. Further, a large number of cooling water nozzles 12 are installed between the sabot rolls 10 in contact with the dispersion 11, and cool the molten metal 2 from the bottom surface.

The side of the molten metal 2 on the heald 1 is side +tv +゛ stage 13
．． Supported by 13゛. Side wall means 13.13
゛ consists of a plurality of blocks connected to each other so as to be tiltable, and when traveling in a straight line, their outward direction (the surface in contact with /8 molten metal 2) forms one continuous flat plane, and is endless. connected to. Side wall means 13.13' are bell I
” It is driven to run in synchronization with 1.

Furthermore, the side wall means 3 is installed immediately before contacting the molten metal 2.
．． Refractory material may be sprayed onto the outer surface of the side wall means I3.13" by suitable means (not shown) to fill the gaps between the blocks.

jA: %'Q-I C: 0.11 si: 0.22 Mn: 0.
72 P:0.021S:0.002 Month:
Molten steel with a composition of 0.035 (heavy %) at 1580°C is pumped with an electromagnetic pump at a rate of 15 kg/min - constant b)
While supplying hot water with L, the endless bells 1 to 1 are moved at a speed of 1 m/min, water-cooled from the f side, and A is placed on the /8 steel side.
1.03 series paper string-like heat insulator with a thickness of about 30 mm
I did 4. In addition, side 11' solo lock 13.13'
Distance &J: 300 mm. Remove the dirt with a brush at a point approximately 7m from the hot water supply area. l, ,11. , then, ``Page 1 - Scarf Ints''! ε
5mm and 10mm! Two types of tests were conducted. Na”
1. At the curved part i than the hot water supply part (u wall member and bell 1)
I blew the seal in between, and the side wall was touched by the burner.
) Addition of the outer surface of r! The crystal direction of the '+' piece is 4.11 ``One force direction from the T-plane, +
! Crystal growth from the 1.11 plane was almost negligible within a thickness of about 30 mm.

All segregation was concentrated on the top surface, and when the top surface was ground to 5n++n, unevenness remained on the top surface, but the slabs treated with solvent to a depth of 10 mm on the top surface had good properties with almost no impurities or segregation. I got something.

In addition, specimens obtained by further grinding the entire surface of this slab to a depth of 3mm and % were hot rolled to 20mm, 15a+n+, and 10++++n thicknesses, respectively, and then subjected to tempering heat treatment, resulting in a tensile strength of 42 kg/mm and elongation. 21%, bending angle 180”
, Charpy 14 kg-m/cJ.

The solidification speed was set to approximately 10 mm/+nin, but by adjusting the speed to a low value, the purity within the solidified layer would be improved, and if the speed was increased, the two-sided segregation layer of the slab would be thinner. The scarfing loss can be reduced.These can be adjusted depending on the steel type, application, etc.

As detailed above, since the device of the present invention is a horizontal type, the length is long (although the machine height is low), and therefore the equipment cost is significantly higher than that of conventional vertical or curved continuous casting machines. savings can be achieved.

In addition, conventional horizontal continuous casting has nine or square fins or main body ゛C, and it has not been put to practical use for slabs with a large Y: + I type ratio, but the present invention makes it possible to horizontally cast slabs with an artificial expansion ratio. Become.

Furthermore, the cast slab according to the present invention can be used for gluing Axie! Even if this occurs, there is no particular problem, and therefore, the expensive quilt steel conversion or vacuum treatment of molten steel, which was performed for INOL Suetsujiwa'C construction, is no longer necessary, and impurities are eliminated. A good quality boy with no problems with °9 should be beaten 1;1 by An1i11i.

Furthermore, the 5-pieces obtained according to the present invention are 111-part J
) Since it has good properties with no I'', it is sufficient to use a rolling reduction ratio of about 2-5 in the mining process.
The slab thickness is about half that of the conventional one, or 11J f!
E: and the efficiency of the heating process and rolling process is
Becomes J Noh.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of the horizontal continuous casting apparatus of the present invention. FIG. 2 is a detailed view of the endless heddle of the horizontal continuous casting apparatus of the present invention. (Reference number) 1: 1 bell 1-12: /8 molten metal, 3: weir 4: container, 5.5゛: electromagnetic pump, 6: heat insulator 7: scraper, 8: roller table, 9: pot Scarfa, 10
: Sabo 1-roll group u; ;'? 'J Month 1 Water Arrangement' (, 12: Water cooling nozzle group 1:), 13'; IT wall means ill I Applicant Sumitomo Metal Industries Co., Ltd. Agent Patent Attorney Masahiko Arai

Claims (2)

[Claims] (1) While continuously transferring the molten metal to water 41, the /fl
A horizontal continuous spinning method characterized by cooling only the surface of the IA (!total bending Q) layer and performing unidirectional solidification from the bottom surface. (2) The upper blade part (, [runs horizontally!! 1 (end heald and the upstream end of the -1 force part of the endless root)]
The two parts of the anchorage 1- and the anchorage 1- are arranged so as to be inclined at an angle of 10 degrees or less in the direction of the running force, and A pair of side wall means running on both sides of the two parts in synchronization with the run 1
Part 1ii consists of means for supplying molten metal to the upper part 11 mold defined by the weir and a pair of sidewalls f', and means for cooling the l = force bending part of the endless bell 1- from its lower surface. Horizontal continuous casting equipment j/i' motivated by