JPH04176851A - Production of stainless steel-coated iron wire - Google Patents

Abstract

PURPOSE:To easily produce a stainless steel-coated iron wire excellent in corrosion resistance by setting a vertically movable cylindrical coating chamber in a vessel contg. molten stainless steel and passing an iron wire through the coating chamber from the through hole at the lower part of the vessel. CONSTITUTION:A cylindrical refractory wall 41 constituting a coating chamber 4 is firmly attached to the bottom of a vessel 2, and an iron wire W is passed through the coating chamber 4 from a through hole 27 surrounded by a water- cooled jacket 26 and supported by a pinch roll P. A stainless steel melt 1 is poured into a melt storage chamber 24 to a specified level, then the wall 41 is gradually lifted by a movable device 3 to form a specified gap, and the melt 1 is filled into the coating chamber 4 to the same level as in the storage chamber 24. The wire W is traveled at a constant speed in direction of the arrow and passed through the coating chamber 4 to deposit the solidified melt 1 on the surface. The traveling speed of the wire W is preferably controlled to about 5-10m/min at this time. As a result, a stainless steel-coated iron wire having excellent corrosion resistance is easily and inexpensively produced.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method and apparatus for coating iron wire with stainless steel.

(Prior Art) Conventional iron wires have high strength and are inexpensive, so they are used in various ways in all fields and have an extremely wide range of applications. However, the biggest problem with iron wire is that it easily rusts.

Therefore, depending on the usage environment, corrosion-resistant coated iron wire is used, either at the expense of durability or at the expense of increased cost. For example, galvanized iron wire or vinyl-coated iron wire is used for trellising wire in pear or vineyard fields, and although this is intended to extend its lifespan, it is highly susceptible to corrosion from pesticides and deterioration from ultraviolet rays. ,
The reality is that they are replaced every three to four years. Recently, due to a shortage of personnel and other reasons, relining work is expensive, so some companies are now using stainless steel wire, which has excellent corrosion resistance. However, because they are expensive, the burden of rising prices has become a major problem.

・In the past, stainless steel clad iron wire was put into practical use for the purpose of reducing coasting, but the price did not meet market needs and it did not become popular.

(Problems to be Solved by the Invention) As described above, conventional stainless steel wire rods have high corrosion resistance but are expensive, and the same is true for stainless steel clad iron wires, so there is a demand for the supply of inexpensive iron wires. .

In view of the current situation, an object of the present invention is to provide a method and apparatus for easily and inexpensively manufacturing iron wire having excellent corrosion resistance by melt-coating stainless steel.

(Means for Solving the Problems) In order to achieve the above object, the present invention has the following configuration. That is, (1) molten stainless steel is accommodated in a container having a heating means disposed in the side wall, and a coating chamber filled with the molten metal and partitioned by a vertically movable cylindrical partition is installed; (2) A method for producing a stainless steel coated iron wire, characterized in that the iron wire is introduced into the coating chamber through a through hole provided in the lower part of the iron wire and passed through the coating chamber, A cylindrical structure with a fireproof bulkhead is placed inside a stainless steel molten metal storage container equipped with a water cooling jacket.
This is an apparatus for manufacturing stainless steel coated iron wire, characterized in that a coating chamber having a tapered tapered surface on its lower inner wall is supported by a vertically movable device provided outside the container.

The present invention will be explained in detail below.

The attached drawing shows an example of a device for carrying out the present invention, and shows a container 2 containing molten stainless steel 1 and a cylindrical coating chamber 4 supported by a movable device 3 and movable up and down being installed in the container. This is the main structure.

That is, in the container 2, a molten stainless steel storage chamber 24 is formed by a refractory lining 23 supported on an outer shell 21 via a heat insulating material 22, and a heating coil 25 is embedded in the heat insulating material 22 to store the molten stainless steel fk1. It retains heat and prevents freezing and solidification. A water cooling jacket 26 supported by the outer shell 21 is provided at the bottom of the container 2, and a through hole 27 having approximately the same diameter as the iron wire that penetrates the refractory laning 23 and opens into the container is provided in the center of the water cooling jacket 26. have. A lid 28 made of a fireproof material is placed on the top of the container 2, if necessary. 29 is a lid for the molten metal inlet.

The covering chamber 4 is partitioned by a cylindrical fireproof material (wall) 41,
A taber 42 similar to the construction method is provided on the lower inner wall. This coating chamber 4 is fixedly supported by a movable device 3, and is moved up and down by the operation of the movable device 3, so that the gap between the lower part of the coating chamber and the bottom of the container can be adjusted. During normal operation, the lower part of the coating chamber communicates with the molten metal storage chamber 24, and by adjusting the gap, the flow of the molten stainless steel into the coating chamber can be controlled. In addition, at the time of starting operation or in an emergency such as an accident, the lower part of the coating chamber and the bottom of the container can be brought into close contact with each other to prevent intrusion of molten metal.

The movable device 3 includes an actuator 31, such as a hydraulic cylinder, which is fixed to the outer wall (iron skin) 21 of the container 2, a vertical operating rod 32 connected to this and supported by the outer wall of the container, and one end attached to the vertical operating rod 32. It is composed of a support rod 33 that connects the two ends and has its other end fixed to the cylindrical partition wall 41 of the coating chamber 4. However, mobile equipment W
It goes without saying that 3 is not limited to such a configuration and may be separated from the container 2 and provided with another operating device.

In the figure, W is an iron wire that coats the molten stainless steel, and P is a pinch roll that transports the iron wire.

In the present invention, at the time of starting, the cylindrical fireproof wall 41 is
After passing the iron wire W through the coating chamber 4 through the through hole 27 surrounded by the water cooling jacket and supporting it on the pinch roll P, the molten metal 1 of stainless steel (for example, 5US304) is injected into the molten metal holding material 24. After the molten metal 1 reaches a predetermined level, the fireproof wall 41 is gradually raised from the bottom wall of the container to form a predetermined gap, and the coating chamber 4 is filled with the molten metal 1 to the same level as the molten metal storage chamber 24. At the same time, the iron wire W starts to be transferred at a constant speed. Molten stainless steel solidifies and adheres to the surface of the iron wire W running in the coating chamber 4.

The molten metal that comes into contact with the iron wire solidifies and adheres to it due to an endothermic reaction on the surface of the iron wire, but there is a limit to the amount of heat that the iron wire can absorb, and by controlling the running speed of the iron wire within this limit, the solidification (coating) thickness can be controlled. adjust. Normally, the running speed of the iron wire is preferably 5 to 10 m/min.

It is also desirable to coat the iron wire with a thin layer of flux to improve adhesion to the stainless steel. That is, when the iron wire comes into contact with the molten metal, the flux melts and the active surface of the iron wire is exposed, increasing the degree of adhesion.

The melted flux floats up inside the coating chamber, covers the surface of the molten metal, plays a role in preventing oxidation, and re-attaches to the coagulated iron wire coating and is carried out of the container. When the flux floats up, the tapered portion at the bottom of the cylindrical refractory wall serves to guide it into the coating chamber.

Further, since a small amount of iron is eluted from the iron wire into the coating chamber 4, by slightly increasing the alloy composition of the molten metal, the molten metal in the coating chamber can have an appropriate alloy content.

The molten stainless steel in the container is kept at a constant temperature by a heater, but in order to promote solidification in a short time, casting additives are added to lower the solidification temperature, and the molten metal temperature is adjusted to compensate for the temperature drop. It is possible to keep it low.

As a result, since solidification can be performed in an appropriately cooled state, it is possible to increase the solidification rate, and moreover, it is possible to form a thick coating layer.

The surface of the molten metal in the storage chamber is protected from oxidation by a non-oxidizing gas atmosphere or by being coated with a suitable flux. Furthermore, since the molten metal is carried out due to adhesion of the iron wire, it is preferable to replenish the molten metal as appropriate to maintain the surface at a constant level. Incidentally, since a slight amount of iron from the iron wire is eluted into the molten metal, it is preferable to adjust the alloy composition of the molten metal to a slightly higher level.

The iron wire coated with a coagulated layer of stainless steel is pulled up by pinch rolls P and wound into a coil. After cooling,
If necessary, the wire diameter and material can be adjusted by drawing the wire through a die.

(Effects of the present invention) As explained above, the present invention allows iron wire with excellent corrosion resistance to be easily and inexpensively produced by solidifying and coating molten stainless steel, and its industrial value is extremely large. .

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of the device of the present invention. 1. Molten stainless steel 2: Container 21: Outer shell 22. Insulating material 23: Fireproof lining 24: Molten metal storage chamber 25: Heating coil
26 Two water cooling jackets 27: Through holes 28:
Lid 29: Injection chamber lid 3: Movable device 31: Actuator
32: Vertical operating rod 33: Support rod
4: Covering chamber 41: Fireproof material (wall) 42: Tapered part

Claims (2)

[Claims] (1) A molten stainless steel metal is stored in a container having a heating means in the side wall, and a coating chamber filled with the molten metal and partitioned by a vertically movable cylindrical partition is installed, and a coating chamber is installed in the lower part of the container. 1. A method for producing a stainless steel coated iron wire, comprising introducing the iron wire into a coating chamber through a through hole provided in the coating chamber. (2) A heating means is embedded in the side wall made of refractory material, and a container for storing molten stainless steel is equipped with a water-cooled jacket having iron wire holes at the bottom.
1. An apparatus for producing stainless steel coated iron wire, characterized in that a coating chamber having a tapered shape on the lower inner wall is supported by a vertically movable device provided outside the container.