JPS63161112A - Wire for adding iron and steel and non-ferrous alloy - Google Patents

Abstract

PURPOSE:To prevent the development of gap at the seaming part at the time of treating and to improve the yield of adding agent in molten meal by bending toward inside both edge parts of joining part of wire for the adding agent and encircling as bending one side bent part by the other bent part. CONSTITUTION:Long length body having the material, which is consistent with molten metal is formed as cylindrical shape to make outer cover 1. Both edge parts 2, 3 of the outer cover 1 are bent toward inside and joined, so as to encircle the one side bent part 2a by the other bent part 3a, 3b. The bent part 2a and the bent part 3a are mutually joined by suitable adhesive 4, to improve the air-tightness of the inner part of outer cover 1. The powdery adding agent 5 composing of metal flux or these mixture, etc., is fillted up in the inner part of outer cover 1, to form wire for adding and steel and non-ferrous alloy.

Description

Detailed Description of the Invention (Industrial Application Field) This invention relates to a wire for adding steel and non-ferrous alloys, and in particular to a wire for adding steel and non-ferrous alloys, which is continuously added to molten metal for refining steel etc. Concerning wire for adding non-ferrous alloys.

(Prior Art) It has been well known to add additives to molten metal for refining and the like. One way to add it is to add block-shaped additives to the molten metal, but with that method, the additives burn near the molten metal, reducing the yield of the additives in the molten metal. Problems such as the generation of smoke and gas are occurring. In view of this, in recent years, wires for adding steel and non-ferrous alloys containing additives have been adopted as wires that can insert additives deep into the molten metal and thus improve the yield of the additives. Conventional examples of such wires for adding steel and non-ferrous alloys include
The wire described in Japanese Patent No. 6-32369 can be mentioned. FIG. 6 shows a cross section of the wire. As shown, the wire has a jacket 21 and a core 22.
The outer cover 21 is formed from a planar elongated body into a circular tube shape, and maintains its shape with both edges 23 and 24 overlapped. On the other hand, core 22
Additives such as powdered Ca5t are added to both edges 23.2 of the above.
4 is filled and compressed into the outer cover 21 to form a solid.

(Problems to be Solved by the Invention) By the way, since the wire for adding steel and non-ferrous alloys is stored by being wound up, the wire may be bent or twisted during winding. be. Therefore, there is a risk that the overlapped portions 23, 24 of the outer jacket 21, ie, the seam portions, may be deformed and a gap may be created there. As a result, while the wire is being stored, external moisture and air enters the core 22 through the gaps, and the additives that make up the core 22 absorb that moisture and oxidize, which adversely affects the molten metal when the wire is added. The problem arises that Moreover, when the wire is inserted into the molten metal, the additive 22 leaks out through the gap near the surface of the molten metal, resulting in a problem that the yield of the additive 22 in the molten metal decreases.

This invention was made to eliminate the above-mentioned conventional drawbacks, and its purpose is to prevent gaps from forming at the seam due to bending, twisting, etc. of the wire during handling such as winding the wire. To provide a wire for adding steel and non-ferrous alloys, which can prevent additives from absorbing moisture or oxidizing, and which can improve the yield of additives in molten metal. It is in.

(Means for Solving the Problems) Therefore, the wire for adding steel and non-ferrous alloys of the present invention has an outer sheath formed by forming a flat elongated body and joining both edges thereof, and an inner part of the outer sheath. A wire for adding steel and non-ferrous alloys comprising an additive filled with an additive, wherein the both edge joint portions bend both edges inward, and one bent portion is further folded at the other bent portion. It has a surrounding configuration.

(Function) In the wire for adding steel and non-ferrous alloys with the above configuration,
The joints on both edges of the outer jacket, that is, the seams, are bent inward and one fold is folded around the other, making the joint stronger than before. This may cause the wire to bend during winding, etc.
Even if the seam is twisted, gaps can be prevented from forming at the seam.

(Example) Next, specific examples of the wire for adding steel and nonferrous alloys of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a cross section of the wire for adding steel and non-ferrous alloys according to this example. In the figure, reference numeral 1 denotes an outer cover made of a material compatible with the molten metal. one bent part 2a.
are joined by being folded around the other bent portions 3a and 3b.

The bent portion 2a and the bent portion 3b are properly bonded to each other with an adhesive 4 to improve the airtightness inside the outer cover 1. The inside of this jacket 1 is filled with an additive 5. The additive 5 is a powder based on metal, flux, or a mixture thereof, and consists of a reactive substance that accelerates the refining reaction or modifies the substance present in the molten metal.

Examples of the material for the jacket 1 include steel, copper, and aluminum.

Examples of the adhesive 4 include epoxy resin, phenol resin, silicone rubber, and synthetic rubber.

Additive 5 includes calcium, magnesium, boron,
Mention may be made, among others, of alloys based on iron, silicon, aluminum, copper, etc., as well as reactive substances such as titanium, zirconium, rare earth elements.

Next, a method for producing the wire for adding steel and non-ferrous alloys will be explained. FIG. 3 schematically shows the manufacturing line. In the figure, reference numeral 6 denotes a feeding machine for continuously supplying a flat elongated body to be formed into the outer cover 1. 7
... forms the elongated body supplied from the feeding machine 6 into a circular tube shape, and also forms bent portions 2a, 3a on both edges 2.3, respectively.
, 3b, and is a forming roller for positioning the folded portions 3a and 3b in the joining position with each other. Reference numeral 8 denotes an additive filling device for filling the inside of the elongated body with additives during the process of forming the elongated body into a circular tube shape using the forming rollers 7 . 9... is a molding roller 7... filled with additives inside.
This is a roller die for reducing and expanding the molded product sent out from the machine to a predetermined diameter.

Reference numeral 10 denotes a winding machine for winding the wire for adding steel and non-ferrous alloys which has been expanded and reduced in diameter.

The above-mentioned forming rollers 7...
In order to mold according to the molding schedule shown in i),
They are arranged in a line. In FIG. 4, (a) shows the elongated body before it enters the forming roller rough.

[Yes]) is made by slightly bending one edge 2 of the elongated body and bending the other edge 3 downward at a substantially right angle to form the bent part 3.
This is a step of forming the main body part a and further curving the main body part so that the bottom part becomes convex. (C) is a step in which both edges 2.3 are moved closer to each other in order to further curve the curved elongated body to form a circular tube shape. ((1) is a step of further bending the edge 3 on which the bent portion 3a has been formed inward at a substantially right angle on its base end side to form the bent portion 3b. (e) is the step of forming the bent portion 3b. This is a step of further curving the edge 3 and bringing the tip of the edge 3 on the side where the bent portions 3a and 3b exist closer to the tip of the other edge 2.

From (f) to (8), while further curving the elongated body, the other edge 2 is bent inward until it becomes a substantially right angle, and one surface of the bent portion 2a is bent over the other edge. Part 3
This is the step of bringing the tip into contact with one surface of the bent portion 3a on the tip side. From (c) to (i), the elongated body is further curved, and the proximal end of the proximal bent portion 3b of one edge 3 and the proximal end of the bent portion 2a of the other edge 2 are This is the process of bringing the parts close together so that they come into contact with each other. Each forming roller 7... has a configuration that allows each of the above steps to be carried out.

In addition, when the adhesive 4 is used for the joint, the adhesive is applied to the outer surface of the tip-side bent portion 3a of one edge 3 in the molding step (e), and the tip of the bent portion 3a is applied in the molding step (8). The outer surface of the side bent portion 3a and the inner surface of the bent portion 2a of the other edge 2 may be brought into close contact. At this time, if the adhesive 4 is applied mechanically, it becomes possible to apply the adhesive 4 uniformly in a small amount.

As shown in FIG. 5, the additive filling device 8 includes a sealed container 11 that stores the additive 5, and a chute 12 that is attached to the lower end of the container 11 and guides the additive 5 into the molded product. ,
The compressed gas blowing nozzle 13 is arranged so as to face the inside of the base end of the chute 12 from the inside of the container 11.

The chute 12 extends downward from its proximal end or from the lower end of the container 11, and has a configuration in which its distal end extends substantially perpendicularly to the proximal end. In the additive filling device 8, the bent part of the chute 12 faces inside from between both edges 2.3 of the elongated body immediately after the forming process (C), and the tip end faces the inside from between both edges 2.3 in the forming process (f). 2.
3 is arranged so as to extend into the inside of the closed elongate body. The additive 5 in the container 11 is delivered to the compressed gas blowing nozzle 1
The compressed gas blown out from the chute 12 is fed under pressure into the elongated body from the tip of the chute 12. As mentioned above,
In that case, if the area of the outlet of the chute 12 is made larger than the area of the inlet, the additive 5 can pass through the inside of the shade 12 smoothly. Since the tip of the chute 12 extends to the forming step (f) where both edges 2.3 of the elongated body are closed, the additive 5 will not leak out between the edges 2.3. The filling amount is detected by a level sensor (not shown) installed before or after the molding process, and the gas pressure is adjusted depending on the detection result.
It is configured such that the filling amount of the additive 5 can be adjusted.

Examples of the compressed gas include inert gas such as argon and air. However, when air is used as the compressed gas, there is a risk that gases harmful to scouring, such as oxygen and nitrogen, may be mixed into the filled additives, so in this case, an inert gas such as argon gas is preferred.

In FIG. 3, the roller dies 9 are arranged continuously on the same line as the forming rollers 7.

The molded body filled with the additive 5 and brought into the molding step (i) is compressed by roller dies 9 and gradually expanded to reduce its diameter. At this time, the filled additive 5 is also compacted, and the gas existing between the powder particles constituting the additive 5 is released, and the powder particles are strongly bonded to each other and become solid. When the compressed gas is air containing oxygen or nitrogen, it is considered that most of the oxygen and nitrogen are removed by gas release accompanying compaction of the additive 5. Further, due to the bonding of the powder particles together as the additive 5 is compacted, spilling of the additive from the cut portion is also prevented when the wire as a product is appropriately cut. The compaction of the additive 5 also ensures the bonding of the edges 2.3 of the molded body. That is, the forming process (i
), the joined state of the edges 2.3 of the molded body is such that the bent portion of the other edge 2 is connected between the proximal bent portion 3b and the distal bent portion 3a of one edge 3. This is a state in which 2a has play and is just inserted. When the molded body in this state is reduced in diameter with a roller die 9 and the filled additive 5 is compacted, the additive 5 resists the force and the base end of one edge 3 of the molded body An attempt is made to compress the bent portions 3b and 3a on the side and tip sides from both sides. the proximal side and distal side bent portions 3b;
3a is crimped to both sides of the bent portion 2a of the other edge 2, thereby ensuring that both edges 2.3 are joined together.

Next, a conventional wire for adding steel and nonferrous alloys and a wire for adding steel and nonferrous alloys of the present invention manufactured by the above method were prepared, and the filling rate, leakage rate, and moisture absorption rate were compared. The diameter of the wires used was 6 ma+, the thickness of the long bodies used was 0.41111, the width was 25 m, and the additives used were equivalent to calcium silicon JIS No. 1. The filling rate was determined using the following formula.

Filling rate (%) -100x Additive weight (g) / Wire weight (g) The additive leakage rate is determined by measuring the weight of the additive that leaks out from the seam when the wire is bent or twisted. Obtained from the formula.

Leakage rate (%) -100X Additive leakage amount (g) / Additive weight (g) Moisture absorption rate is determined by leaving both wires sealed at both ends in a constant temperature room (30°C 190%) for 24 hours. The moisture content before and after was measured and calculated from the following formula.

Moisture absorption rate (%) -100 .3%, additive leak rate 0.6%,
The moisture absorption rate is 0.05%, while those of the steel and nonferrous alloy additive wire of this invention are 35%, 0%, and 0.05%, respectively.
It was 0.02%.

Also, the wire diameters are both 10 m, and the width of the long body is 48 m.
When both the chicks and the thickness were changed to 0.4 WI and the same additives as above were used, the filling rate of the conventional wire was 46.4%.
, the leakage rate is 0.9%, the moisture absorption rate is 0.05%, while those of the wire of this invention are 48%, 0%, 0°02
%Met. In that case, the moisture absorption rate was 0.01% when an adhesive was used at both edge joints.

In addition, the wire diameters are both 12.5 mm, and the width of the long body is 5 mm.
When the thickness was changed to 0.5ffi for the conventional wire and 0.4 trtm for the inventive wire, and the same additives as above were used, the filling rate of the conventional wire was 50.5%. The leakage rate was 1.1% and the moisture absorption rate was 0.06%, while those of the wire of this invention were 55%, 0%, and 0.03%.

In that case, the moisture absorption rate was 0.01% when an adhesive was used at both edge joints.

From the above results, the additive filling rate is higher in the wire of the present invention than in the conventional wire, and the leakage rate and moisture absorption rate of the additive are decreased or drastically reduced in the wire of the present invention as compared to the conventional wire. I can see that it is.

The reason for the high filling rate is that in conventional wires, additives were poured into the curved recesses of the curved elongated body, whereas in the wire of this invention, additives were poured into both edges. This is because the additive is given a certain degree of density before the diameter reduction process because it is pumped and filled inside a circular tube-shaped elongated body with a closed end. The additive leakage rate and moisture absorption rate were reduced because the wire of the present invention is less likely to form gaps at the seam than the conventional wire.

We also conducted an experiment to compare the yield of additives in the molten metal when a wire was inserted into the molten metal. Conventional wires and wires for adding steel and nonferrous alloys of the present invention having a wire diameter of 10 n+m containing calcium silicon as an additive were prepared, and the wires were deeply inserted into 75 tons of 545C molten metal held in a ladle. The amount of calcium inserted was set so that the weight of calcium per 1 ton of molten metal was 0.09 kg. Then, the calcium yield in the molten metal was determined from the following equation.

Yield (%) = 100 X Amount of calcium remaining in the product (%) / Added amount of calcium (%) As a result, the yield of the conventional wire is 8 to 13%, that of the conventional wire of this invention is 12 to 17%, That of the wire using adhesive at both edge joints and argon gas for additive filling was 15-20%. Further, conventional wires and wires of the present invention having a wire diameter of 12.5 mm and using additives similar to those described above were prepared, and the wires were deeply inserted into 180 tons of molten STV material contained in a ladle. The amount of calcium inserted was set so that the amount of calcium per 1 ton of molten metal was 0.15 kg. As a result, the yield of conventional wire is 9~
14%, that of the wire of this invention was 14-18%, and that of the wire using adhesive at both edge joints and argon gas for additive filling was 17-21%. , it can be seen that the wire of the present invention has a higher additive yield than the conventional wire. This is due to the following reasons. In other words, when inserting a wire into high-temperature molten metal, conventional wires have overlapping seams that easily open, and the additives inside are exposed to the molten metal before being inserted deeply. The product floats due to combustion, and the yield becomes the above value. In the wire of the present invention, the joint at the seam portion is quite strong, so there is almost no opening during insertion of the molten metal, so the yield is higher than that of conventional wires. Furthermore, yields are even higher when adhesives are used in the joints.

As described above, in the wire for adding steel and non-ferrous alloys according to this embodiment, both edge joints, that is, seam portions of the jacket 1 are bent inward, and both edge portions 2.3 are bent inward.
Since one bent portion 2a is configured to be folded around the other bent portions 3a and 3b, gaps may be formed at the seam portion due to bending or twisting of the wire during handling such as winding the wire. can be prevented. Therefore, the additive 5 is prevented from absorbing moisture, being oxidized, and leaking, and moreover, it is possible to improve the yield of the additive 5 in the molten metal.

In addition, especially when the additive 5 is strongly oxidizing, such as metallic calcium and its alloys, using the adhesive 4 at the joint will further seal the inside of the outer sheath 1, allowing the additive 5 to Oxidation and moisture absorption can be suitably prevented.

Furthermore, when filling the additive 5 under pressure with an inert gas such as argon, it is possible to prevent oxygen from existing between particles of the additive 5 during storage of the wire. Therefore, oxidation of the additive 5 is prevented. In this case, if adhesive 4 is used at the joint, the inside where the inert gas is present will be isolated from the outside world, and this will be even more effective. Moreover, when using an inert gas, after inserting the wire into the molten metal,
The problem that the additive 5 is oxidized and floats up as slag, resulting in a decrease in yield, is further suppressed.

Further, the seam portion is configured such that both edges 2.3 of the elongated circular tube-shaped body are bent inward, and one bent portion 2a is surrounded by the other bent portions 3a and 3b. Therefore, no irregularities or steps will be created on the outer surface of the jacket 1 due to bonding. Therefore, twisting or the like will occur in the wire during the winding operation of the wire from the roller die 9 or the operation of inserting it into the molten metal. It is possible to suppress it. In contrast, in the conventional overlapping method, the edges of the seams that overlap from the outside are formed at acute angles to prevent the formation of steps. It is difficult to realize this, and considerable unevenness will occur on the outside.

Although the embodiments of the wire for adding steel and non-ferrous alloys of the present invention have been described above, the present invention is not limited to the above embodiments, and can be implemented with various modifications within the scope of the invention. be. For example, as shown in FIG. 2, a folded part 14 formed by folding a part of the outer cover 1 inward may be formed at a position facing the above-mentioned both edge joint parts. In this case, twisting of the wire-added special wire can be prevented. Note that this folded portion 14 is formed during the transition from (b) to (C) of the molding process shown in FIG. 4.

In addition, the adhesive 4 may be used by selecting it as appropriate, and even in the case of an oxidizing additive 5, if it is determined that the joint of the present invention can sufficiently handle the problem, the adhesive 4 may not be used. Tomoyoshi. Further, in the above embodiment, the outer cover 1 is formed into a circular tube shape, but it may be formed to have any cross section such as a rectangular cross section or an elliptical cross section.

(Effects of the Invention) As described above, in the wire for adding steel and non-ferrous alloys of the present invention, both edge joints of the outer sheath, that is, seam portions, are bent inward, and one bent portion is Since the joint is constructed so that it is folded around the other bent part, the joint is stronger than before, and as a result, when the wire is bent or twisted during handling such as winding, a gap is created at the seam part. can be prevented. Moreover, as a result, the additive is prevented from absorbing moisture or being oxidized, and moreover, it is possible to improve the yield of the additive in the molten metal.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view showing one embodiment of a wire for adding steel and non-ferrous alloys according to the present invention, Fig. 2 is a cross-sectional view showing another example, and Fig. 3 is a cross-sectional view showing an example of a wire for adding steel and non-ferrous alloys according to the present invention. An explanatory diagram schematically showing a production line for manufacturing wire for
Figures 4 (a) to (i) are explanatory diagrams showing each forming process of a long body in a forming roller, Figure 5 is a cross-sectional view of the main part of an additive filling device, and Figure 6 is a conventional steel and non-ferrous steel FIG. 3 is a cross-sectional view of the wire for alloy addition. 1... Outer cover, 2.3... Edge, 2a... Bent part,
3a...Distal side bending part, 3h...Proximal side bending part, 5
···Additive. Patent applicant: Ryoko Sumikin Welding Co., Ltd. Agent: Masahiro Nishimori
・1・1,, -:+H1 Procedural amendment (self-restraint April 2, 1988 Patent Application No. 307134 2, title of invention wire for addition of steel and non-ferrous alloys 3, person making the amendment) Related Patent Applicant: 2-1 Fuso-cho, Amagasaki-shi, Hyogo Prefecture Representative: Hidenori Hidenori 4, Agent: 3rd floor, Taiyo Building, 2-16 Awaji-cho, Higashi-ku, Osaka City Telephone: 0
No. 6-204-1567, Detailed Description of the Invention in the Specification Subject to Amendment. (1) The description of “refining” on page 1, line 14 of the specification,
I corrected it to "refining." (2) In the first line of page 6 of the same book, the description of "silicone rubber-based" is corrected to "acrylic-based resin." (3) The statement ``uchibun'' on page 7, line 15 of the same book is corrected to ``inward''. (4) In the same book, page 10, lines 16 to 17, the statement ``if the air contains oxygen or nitrogen'' is corrected to ``even if the air is air.'' (5) The statement “constant temperature” on page 12, line 11 of the same book,
Correct it to "constant temperature." (6) The statement "For addition to steel and non-ferrous alloys" on page 14, line 13 of the same book is deleted. (7) In the same book, page 15, lines 19 to 20, the statement ``exposure to combustion and combustion'' is corrected to ``reaction upon contact with.'' −1 above

Claims (1)

[Claims] 1. A wire for adding steel and non-ferrous alloys, comprising an outer sheath formed by forming a planar elongated body and joining both edges thereof, and an additive filled inside the outer sheath, the wire comprising: A wire for adding steel and non-ferrous alloys, characterized in that the edge joint portion has a configuration in which both edges are bent inward, and one bent portion is further folded around the other bent portion.