Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
  • B21C47/00—Winding-up, coiling or winding-off metal wire, metal band or other flexible metal material characterised by features relevant to metal processing only
  • B21C47/26—Special arrangements with regard to simultaneous or subsequent treatment of the material
  • B21C47/265—"helicofil" systems
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
  • B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
  • B21B45/0203—Cooling
  • B21B45/0209—Cooling devices, e.g. using gaseous coolants
  • B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
  • B21B45/0224—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes for wire, rods, rounds, bars
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
  • B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
  • B21B45/0203—Cooling
  • B21B45/0209—Cooling devices, e.g. using gaseous coolants
  • B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
  • B21B45/023—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes by immersion in a bath
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
  • B21C47/00—Winding-up, coiling or winding-off metal wire, metal band or other flexible metal material characterised by features relevant to metal processing only
  • B21C47/02—Winding-up or coiling
  • B21C47/10—Winding-up or coiling by means of a moving guide
  • B21C47/14—Winding-up or coiling by means of a moving guide by means of a rotating guide, e.g. laying the material around a stationary reel or drum
  • B21C47/146—Controlling or influencing the laying pattern of the coils
• • C—CHEMISTRY; METALLURGY
  • C21—METALLURGY OF IRON
  • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
  • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
  • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
  • C21D9/54—Furnaces for treating strips or wire
  • C21D9/56—Continuous furnaces for strip or wire
  • C21D9/573—Continuous furnaces for strip or wire with cooling
  • C21D9/5732—Continuous furnaces for strip or wire with cooling of wires; of rods
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B41/00—Guiding, conveying, or accumulating easily-flexible work, e.g. wire, sheet metal bands, in loops or curves; Loop lifters
• • C—CHEMISTRY; METALLURGY
  • C21—METALLURGY OF IRON
  • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
  • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
  • C21D1/56—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering characterised by the quenching agents
  • C21D1/607—Molten salts
• • C—CHEMISTRY; METALLURGY
  • C21—METALLURGY OF IRON
  • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
  • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
  • C21D1/62—Quenching devices
  • C21D1/63—Quenching devices for bath quenching

Definitions

• the present invention relates to a controlled cooling method and a controlled cooled wire in the production of a hot-rolled steel wire.
• the incandescent wire is dropped on a horizontally traveling conveyor while forming a spiral ring by a laying type winder, and is spread in a non-concentric parallel ring row. Cool by blast. Simultaneous patenting, air cooling, slow cooling, etc. Even the possible is ⁇ present method, it is insufficient to the intensity level of patenting is limited to the cooling force due to the ⁇ cooling, the dense overlap-rings at both sides of the parallel-ring column, the cooling rate The problem is that the strength is reduced and the strength is further reduced. There is also a problem with facilities such as a long space.
• JP-B-63-24048 The method disclosed in JP-B-63-24048 is a double-row facility that applies boiling cooling to the non-concentric parallel ring rows and has the above-mentioned Stellmore process. It has various functions such as annealing, weak patenting by air cooling, strong patenting by air-water mixed boiling cooling, and quenching by cold water immersion. The uniformity of the mechanical properties within the coil is also relatively good, but the problem of strength reduction at the side of the parallel ring row remains. In addition, since all cooling methods are continuous cooling, the uniformity of the microstructure of the mouth is lacking compared to the isothermal transformation.
• wire mills require various types of controlled cooling to accommodate various products and various dimensions.However, the conventional controlled cooling method lacks the level of mechanical properties of the obtained wire rods, However, there is a problem that the dispersion in the inside is large and the microstructure is not uniform. In the method that solved these quality problems, it was necessary to install equipment redundantly because of the single function, and there was also a problem of high operating cost. '
• a loose coil originally means a random winding against a closely aligned winding.
• a coil having a cylindrical shape is defined as a geometric loose coil (see FIG. 2).
• Shape stability ⁇ The coil with excellent workability is highly expected, but there is no working example yet.
• the present invention solves the above-mentioned problems of the conventional control cooling method and the control cooling wire by using geometric loose coils of various control cooling wires from slow cooling to quenching, 1) high quality, and 2) comparison. It is an object of the present invention to provide a controlled cooling method that can be manufactured at a low cost and at a low cost in a single facility with a small space. Means for solving the problem
• the first element used a molten salt as a refrigerant.
• the reason is that isothermal transformation is indispensable in many cases to obtain a uniform structure, and for that purpose, a molten salt having a large cooling rate and a stable processing temperature was determined to be optimal.
• the third element is effective for optimizing the cooling conditions on the refrigerant side, such as ensuring and equalizing the flow velocity and suppressing local temperature rise of the refrigerant in order to reduce the difference in cooling rate between the ring and the coil.
• a new refrigerant circulation system has been devised.
• a traveling red-hot steel wire rod immediately after hot rolling is passed through a self-rotating spiral guide tube to form a vertical spiral ring, and then the general ring is eccentric with respect to the ring axis.
• And cooling the steel wire rod by immersion cooling in the refrigerant.
• the controlled cooling device according to the first aspect, wherein the rotation phase angle of the stacking table is 0.1 to ⁇ / 2 (rad), and the eccentricity is 0.1 to 0.5. Is the way.
• Phase angle (rad) 2 ⁇ X Accumulation platform rotation speed Spiral guide tube rotation speed
• a third invention is a molten salt in which the refrigerant is controlled in a predetermined temperature range, wherein the flow of the refrigerant is The refrigerant flows into the supply port at the bottom of the cooling tank containing the refrigerant, rises up the center of the tank through the partition wall, passes through the ring between the rings at the upper layer in a horizontal centrifugal radial shape, and then partially discharges the outer wall of the tank.
• the external circulation system that flows out of the outlet and returns to the replenishment inlet through the booster pump, and the rest flows downward along the inner wall of the tank by the swirling flow and the guide vanes, flows eccentrically at the bottom, and flows again.
• the controlled cooling method according to the first or second invention, characterized in that the controlled cooling method comprises a partial circulation system that ascends a central part.
• a method for controlling or changing the molten salt in the cooling tank to a predetermined temperature is performed by cooling the outer wall surface of the cooling tank and / or the pipeline of the external circulation system with water for cooling, and for increasing the temperature.
• the controlled cooling method according to the first invention, the second invention, or the third invention characterized in that replacement control is performed from a heat storage tank holding a high-temperature molten salt.
• the average divergent flow velocity of the molten salt passing through the inner and outer surfaces of the coil in the upper part of the cooling tank in the horizontal and radial directions is set to a predetermined temperature between 300 and 700.
• a rate of 0.4 m / s or more an austenitic carbon steel, low alloy steel, or austenitic stainless steel glow wire is subjected to isothermal transformation or rapid cooling and is annealed and normalized according to the temperature.
• a controlled cooling method according to the first invention, the second invention, the third invention, or the fourth invention which comprises performing any of a paralleling process, a patenting process, an austempering process, a quenching and tempering process, and a solution treatment. .
• the refrigerant is water at a predetermined temperature, and continuously heats an austenitic carbon steel, a low alloy steel, or an austenitic stainless steel glow wire, and normalizes the steel wire according to the steel type and the temperature. It is characterized by applying any of pseudo patenting, quenching, and solution treatment A controlled cooling method according to the first invention or the second invention.
• a seventh invention is a geometrically loose coil of a controlled cooling wire manufactured by the method of the first invention, the second invention, the third invention, the fourth invention, the fifth invention, or the sixth invention.
• An eighth invention provides a lay-type winder for forming a traveling red-hot steel wire into a vertical helical ring, an accumulator for receiving and accumulating the ring, a casing for enclosing the accumulator, and storing a refrigerant.
• a rotating mechanism for rotating the refrigerant the refrigerant flows in from the central bottom of the cooling tank, rises in the central part, flows radially from the inside of the ring to the outside of the ring at the upper part, and partially flows out of the tank to the supply port by the booster pump
• It is equipped with a tank water cooling device and / or a pipeline cooling device for the external circulation system and a heat storage tank for holding high-temperature molten salt, and a washing system that draws out the cooled coil and rinses the attached salts with water.
• This is a wire rod controlled cooling device.
• FIG. 1 is a schematic side view of controlled cooling of a hot-rolled wire, showing one embodiment of the present invention.
• FIG. 2 is a diagram showing the shape of a geometric loose 'coil.
• FIG. 3 (a) Cross-sectional view of a coil composed of a non-concentric parallel ring row. (b) A cross-sectional view of a coil constituted by the eccentric integrated ring array of the present invention.
• FIG. 4 is a diagram illustrating a method of circulating molten salt.
• FIG. 5 is a diagram illustrating a method for controlling the temperature of a molten salt.
• the hot wire 2 finished to a predetermined size by the final rolling mill 1 of hot rolling is formed into a vertical spiral ring 5 by a laying type winder 4 consisting of a spiral guide tube that rotates through pinch rolls 3. Is done.
• the ring 5 falls on a doughnut-shaped stacking platform 9 to form a vertical ring row 12.
• the ring Another way to form rows 12 is to form non-concentric parallel ring rows (see Fig. 3 (a) 12 ”) formed on a horizontal conveyor of a normal controlled cooling facility before the control cooling. It may be dropped on the table 9 vertically.
• the stacking table 9 has an elevating mechanism 10 composed of a hydraulic cylinder and a horizontal eccentric rotating mechanism 11 having an eccentric axis Y with respect to a center axis X of the ring 5.
• an elevating mechanism 10 composed of a hydraulic cylinder and a horizontal eccentric rotating mechanism 11 having an eccentric axis Y with respect to a center axis X of the ring 5.
• An inner cylinder 15 having an outer diameter slightly smaller than the inner diameter of the coil and guiding the ring is attached to the stacking table 9 so as to cross the stacking table 9 to prevent the ring row 12 from shifting. The crossing does not hinder the vertical movement of the platform 9.
• the inner cylinder also has a role of a flow path for a refrigerant described later.
• the rotation phase angle of the stacking table 9 is set to a predetermined value between 0.1 and ⁇ ⁇ 2, and the eccentricity is set to a predetermined value between 0.1 and 0.5.
• the phase angle and the eccentricity are defined as follows.
• the former means the turning angle per ring, and the latter means the extent of the ring in the radial direction.
• Phase angle (r ad) 2 ⁇ X Accumulation platform rotation speed / helical guide tube rotation speed
• the stacking table 9 is installed coaxially in a cylindrical cooling tank 8 holding a liquid refrigerant 19. Thus, it is in a standby state while rotating just above the liquid level of the refrigerant 19 in advance. As the accumulation of the ring rows 12 progresses, the accumulation table 9 descends and is sequentially immersed and cooled in the refrigerant.
• a cooling tank 8 having a coolant supply port 20 at the bottom and a discharge port 21 at the upper outer edge, and an outer pipe connecting the supply port 20 and the discharge port 21 are provided with a water cooling device 18 and a booster pump.
• a circulation system 16 is formed, which is a means for maintaining and circulating the refrigerant 19 at a predetermined temperature. As shown in FIG. 4, the refrigerant swirls up inside the inner cylinder 15 inside the cooling tank 8, turns horizontally through the inner cylinder 15 at the upper part of the tank, turns horizontally, and rings radially in a horizontal centrifuge. After passing through the gap, it is pushed out to the outer edge. A part goes to the discharge port 21, but the other is a wall attached to various parts of the inner wall of the tank.
• the refrigerant When the setting of the refrigerant temperature is changed to a high temperature, the refrigerant is rapidly replaced from the heat storage tank 45 holding the high-temperature refrigerant via a pump. As shown in Fig. 5, these operations are performed by a temperature sensor 51 that monitors the temperature of the molten salt, a cooling water pulp 52 that opens and closes the cooling water, a coolant supply tank 46, a heat storage tank 45, and a cooling tank. This is done via a temperature control system consisting of a pulp stand (equipped with a pump) that moves between 8 and a heating device 44 and a controller 50 that compensates for the loss of heat of the refrigerant. A molten salt or water in a predetermined temperature range is used as the refrigerant.
• the temperature of the molten salt By setting the temperature of the molten salt to a predetermined value between 1) 600 to 680 ° C, 2) 450 to 600 ° C, and 3) 300 to 450 ° C.
• Austenite carbon steel and low-alloy steel hot wire are subjected to isothermal transformation, annealing or normalizing according to 1), strong and weak patenting corresponding to 2), and austempering or 3) corresponding to 3).
• Heat treatment effects such as quenching and tempering parallel processing (in the case of low-carbon steel, the Ms temperature is high and the tempering temperature is relatively low, so that tempering proceeds during holding after quenching).
• solution treatment is performed by setting the molten salt temperature to 400 or less.
• pseudo-patenting can be applied to high carbon steel, and quenching can be applied at 40 ° C. or less.
• the winder 4 is retracted.
• the material is held in rotation in the refrigerant until the rear end transformation is almost complete.
• the coil 13 is lifted up, extruded by a pusher 50 ′ onto the washing tank 14, immersed in the tank 14, and the adhered molten salt is solidified and separated. If necessary, one or more stages of spray washing and immersion washing are applied.
• the basis for forming the geometric loose coil immediately after winding is as follows. The means of distributing the rings to improve the coil shape is often applied in the drawing process.
• the reason why wire rods do not work at all is that the value of the ring diameter, which is an indicator of the flexibility of the ring, is 300 to 500 for drawn wire and 100 to 200 for drawn wire. This is because the negative resistance becomes excessive.
• the deformation resistance decreases to about 10 to 10 during hot working, it is easily formed by plastic strain.
• the conditions for forming the geometric loose coil will be described.
• the following relational expression holds for the coil shape.
• the ring shape is not strictly a perfect circle, but since the phase angle is not excessive, it can be regarded as a substantially circle.
• the eccentricity is preferably a value represented by the following equation.
• the eccentricity is less than 0.1, the eccentricity effect is small, and the shape is not stable due to insufficient coil thickness. If it exceeds 0.5, the coil inside diameter will be too small, which will hinder subsequent handling.
• the ring diameter is set to 1000 mm and the eccentricity is set to 0.3, the outer diameter becomes 1300 mm, the inner diameter becomes 700 mm, and the wall thickness becomes 300 mm, which is a stable shape unlike the past .
• the cooling characteristic is considered with the highest priority. That is, it is necessary that a predetermined cooling rate be given and that the cooling rate be uniform in the ring and in the coil.
• the crossing pitch is improved to at least that of the conventional non-concentric parallel ring row (100 mm at maximum) and the coil diameter is reduced.
• the phase angle is preferably about 0.2 or more from the above equation.
• the wire diameter is small, the winding speed increases because the wire speed is high, and the rotation speed of the stacking table tends to be too high.
• the cooling rate is increased, there is no problem with cooling even if the crossing pitch is slightly reduced, that is, the phase angle may be slightly reduced. Therefore, the lower limit of the phase angle was set to 0.1 for practical use.
• phase angle 0.1 to ⁇ no 2 was specified as an appropriate condition.
• Figure 3 schematically compares the ring overlap situation of the eccentric integrated ring row 12 and the non-concentric parallel ring row 12 "of the conventional method. Since both adjacent rings intersect and overlap, There is no circumferential tightness that weakens the cooling, but the eccentrically integrated ring row is always denser than the central part C of the parallel ring row and coarser than the sides ⁇ , and is leveled for uniform cooling.
• the ring crossing pitches when the ring diameter is 100 mm in the former, the phase angle is 30 °, and the eccentricity is 0.25, the inner circumference is 200 mm. mm, at the outer circumference
• the eccentric integrated ring array has a significantly higher level of density than the non-concentric parallel ring array, and is more convenient for uniform cooling of coil ⁇ .
• the question is whether the desired cooling strength can be obtained.
• the value of the present invention the molten salt or water is used as a refrigerant the heat transfer coefficient of the former case a (W / m 2 K) is in a stationary bath of about 1 5 0 0, 2 5 0 mmZ s It has been found that the flow velocity in the perpendicular direction is about 250, and its cooling capacity is extremely large. In the case of conventional lead bath patenting, the value of a is about 2000, so it can be seen that given a slight flow rate, it is comparable to lead bath quenching. This is demonstrated in Case E. Was identified as 0. 0 5 ⁇ Roh case of right angles to flow ⁇ 1 7 0 0 ⁇ 2 0 0 0 of 3 by the experiment.
• the problem is the penetration and escape of the refrigerant flowing between the rings because the rings are accumulated. Even if the heat transfer coefficient required for constant temperature transformation is obtained, if it is small, the refrigerant temperature will rise locally and the transformation temperature will not be constant.
• the present invention has three devices to solve this problem. First, the rotation of the stacking table makes it easier for the refrigerant to penetrate outward between the rings by centrifugal action.
• the above-mentioned flow is promoted in the upper layer of the tank by the refrigerant external circulation system described above.
• this depends on the supply. It is possible to cover all the required ring speeds (about 0.05 m / s or more).
• a third device is the addition of the guide vanes and the suction vanes.
• the circulating flow in the tank was added to the flow of the supply to increase the flow velocity and flow rate between the rings. It is also effective to apply gas publishing from the bottom of the tank.
• the rolling speed is usually from 10 to: lOOm / s corresponding to the wire diameter (15 to 5.5 mm), and the winding speed is about 3 to 30 rps. If the winding speed is high, the phase angle should be set small. Otherwise, the number of rotations of the accumulator becomes excessive and an excessive eddy current is formed, which is inconvenient. If the phase angle is reduced to 0.15 rad at the winding speed of 30 rps, the rotation speed of the stacking platform will be 0.7 rps.
• the vortex depth is estimated to be about 50 Omm, which is somewhat inconvenient, but this is alleviated and corrected by the action of the guide vanes and the supply flow from the center.
• Refrigerant flows horizontally, centrifugally, and radially between the ring rows and heats up. Therefore, the refrigerant temperature differs between the inner and outer peripheral portions of the coil.
• the outer periphery cools somewhat with a time delay. The difference between the inside and outside temperature of the surrounding coolant during the transformation is not as large as in the initial cooling. This is because the temperature rise of the refrigerant is small at the time when the inner peripheral portion starts the isothermal transformation.
• the temperature rise of the refrigerant is related to the required flow rate and flow velocity.
• the relative flow velocity between the ring train and the refrigerant is difficult to calculate due to the complex turbulence, but the virtual flow velocity in the horizontal and radial directions is based on the flow rate (sum of supply and circulation) and cross-sectional area of the flow path (flow layer It is calculated as the quotient of the product of thickness and circumference.
• the virtual flow velocity at a position between the inner and outer diameters of the coil is defined as an average divergent flow velocity. Ring from average divergence velocity The time to pass through the column is found. The amount of heat received and the amount of temperature rise of the refrigerant are estimated during the time.
• the temperature of the entire refrigerant rises by about 30 ° C., but the difference between the inside and outside of the refrigerant temperature during the constant temperature transformation is 15 or less. The difference in the isothermal transformation temperature itself is further reduced.
• the average divergent flow velocity in the ring was specified to be at least 0.04 m / s.
• Table 1 shows the specific design examples of the present invention and the results of wire treatment.
• the winding speed in the table is the same as the spiral guide tube speed.
• the mechanical properties of the obtained wire are based on laboratory tests simulating the present invention. As shown in the table, the uniformity within the coil is high.
• Coil thickness garden 300 300 300 Tensile strength / average N / tnm2 1010 1280 844
• Tensile strength ⁇ deviation N / mm2 5 6 10 The experimental conditions are as follows. For the test material, five straight wire samples were lined up with a gap between them, and then the five bundles were also obliquely mixed and heated in a similar manner to a four-tiered bundle to a predetermined temperature, and then heated in a molten salt to a temperature of 0.05. It cooled while moving up and down at the speed of m / s. Industrial applicability
• the present invention firstly, it is possible to perform a constant temperature transformation process by immersing and cooling a glowing wire in a molten salt and flowing the molten salt, and the uniformity in the cross section of the obtained metal structure can be improved. high. As a result, a steel wire with high strength and ductility is obtained. Second, since the glowing rings are regularly integrated and cooled, the uniformity of the wire's mechanical properties within the ring and coil is high. Third, various heat treatments can be easily performed by setting an appropriate bath temperature. The temperature of the molten salt can be changed quickly and easily, which is convenient for production efficiency and cost. Fourth, equipment costs are low because various types of heat treatment can be performed with a single machine. Fifth, a geometrically loose coil with an excellent coil shape can be obtained. The coil has a stable bundling condition and there are few troubles in handling. In addition, there is an appropriate gap between the rings and it is excellent in pickling and heat treatment.
• the present invention is added when a wire rod rolling plant is newly established, the equipment cost is low and various heat-treated wire rods can be obtained from the equipment as compared with the conventional controlled cooling equipment. It is not difficult to install it on an existing wire rod mill because the space required is small. In particular, if the present invention is applied to a factory that produces a wide variety of high quality wire rods in small lots, the effect is extremely large.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Chemical & Material Sciences (AREA)
• Physics & Mathematics (AREA)
• Thermal Sciences (AREA)
• Crystallography & Structural Chemistry (AREA)
• Materials Engineering (AREA)
• Metallurgy (AREA)
• Organic Chemistry (AREA)
• Heat Treatment Of Strip Materials And Filament Materials (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=34269629

Family Applications (1)

Country Status (2)

Cited By (3)

Families Citing this family (3)

Citations (6)

• 2003
  • 2003-09-02 JP JP2003309993A patent/JP3890567B2/ja not_active Expired - Fee Related
• 2004
  • 2004-07-09 WO PCT/JP2004/010164 patent/WO2005024073A1/ja not_active Ceased

Patent Citations (6)

Also Published As

Similar Documents

Legal Events