EP0723025B1 - Invar type alloy wire and manufacturing method thereof - Google Patents
Invar type alloy wire and manufacturing method thereof Download PDFInfo
- Publication number
- EP0723025B1 EP0723025B1 EP96100655A EP96100655A EP0723025B1 EP 0723025 B1 EP0723025 B1 EP 0723025B1 EP 96100655 A EP96100655 A EP 96100655A EP 96100655 A EP96100655 A EP 96100655A EP 0723025 B1 EP0723025 B1 EP 0723025B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- wire
- percent
- weight
- type alloy
- invar type
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
-
- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/001—Heat treatment of ferrous alloys containing Ni
-
- 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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
-
- 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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
- C21D8/065—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires of ferrous alloys
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/10—Ferrous alloys, e.g. steel alloys containing cobalt
- C22C38/105—Ferrous alloys, e.g. steel alloys containing cobalt containing Co and Ni
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/52—Ferrous alloys, e.g. steel alloys containing chromium with nickel with cobalt
Description
- The present invention relates to an invar type alloy wire and, more specifically, to an invar type alloy wire excellent in toughness, strength and low thermal expansion property which can be used preferably as strands for overhead conductor cables.
- An invar alloy having the composition of Fe-36 wt% Ni has been known as an alloy having low thermal expansion property, which is used for precision parts, for example. Meanwhile, in order to increase transmission capacity of an aluminum cable steel reinforced (ACSR) as overhead conductor cable, a method of reducing slack of conductor cable caused by increase in temperature during power transmission has been studied. One method has been known in which an alloy wire having low thermal expansion property is used as a steel core to reduce slacking. An invar type alloy wire such as disclosed in Japanese Patent Laying-Open No. 55-119156 has been developed as such alloy wire having low thermal expansion property.
- The alloy wire developed in accordance with Japanese Patent Laying-Open No. 55-119156 is a hard material and exhibits tensile strength of 120 kg/mm2. However, it exhibits low toughness property stability such as turns of twisting after it has been finally subjected to zinc or zinc alloy plating, thereby reducing production yield of conductor cables. Zinc alloy plating or the like is applied to improve corrosion resistance of the conductor cable. However, an intermetallic compound formed at the interface with the plating tends to lower the twisting property of the alloy wire.
- Therefore, an object of the present invention is to improve toughness of a conventionally used invar type alloy wire having high strength, and, more particularly, to improve twisting property of the wire in the final wire size.
- Document EP 0 723 030 A1 which has the same priority date as this application discloses a Fe-Ni-based alloy wire and a method of manufacturing such a wire. The wire shown in this citation is prepared by processing the material in which the areal percentages of the precipitations at the grain boundaries is up to 2% at finishing hot wire rolling. Moreover, the average crystal grain size of the wire in the longitudinal direction is in the range of 5-70 µm at finishing the hot wire rolling.
- The invar type alloy wire in accordance with one aspect of the present invention contains Fe and Ni as main alloy elements, and the wire has high toughness, high strength and low thermal expansion property, wherein the average grain size in transverse direction of said wire in a final wire size is within a range of 1 to 5 µm; wherein the areal ratio of precipitates existing at grain boundary of said wire in said final wire size is at most 4 % and wherein impurity contained in said alloy is at most 0.01 percent in weight of P, at most 0.004 percent by weight of S, at most 0.005 percent of weight of O and at most 0.008 percent by weight of N.
- Due to the fact that the areal ratio of the precipitates existing at the grain boundary of the wire in the processed final wire size is at most 4%, the twisting property of the wire is improved. Especially when the areal ratio of the precipitates existing at the grain boundary of the wire in the final wire size is at most 2%, twisting property and reliability of the wire can be remarkably improved.
- In the invar type alloy wire in accordance with the present invention, the average grain size in the transverse direction of the wire in the processed final wire size is 1 to 5 µm, and hence twisting property of the wire is improved.
- Especially when the average grain size in the transverse direction of the wire in the final wire size is within 1.5 to 4 µm, the twisting property and the reliability of the wire can significantly be improved.
- The method of manufacturing an invar type alloy wire in accordance with the present invention, comprises the steps of:
- preparing an invar type alloy containing, as main elements, Fe and Ni, wherein impurity contained in said alloy is at most 0.01 percent in weight of P, at most 0.004 percent by weight of S, at most 0.005 percent of weight of O and at most 0.008 percent by weight of N;
- performing hot working and heat treatment in combination to set areal ratio of precipitates existing at grain boundary of said alloy to be at most 2 % and to set average grain size in longitudinal direction of a rod shape processed by said hot working and heat treatment to be within a range of 5 to 40 µm ; and therafter, performing cold working and heat treatment in combination to set areal ratio of precipitates existing at the grain boundary of said alloy in final wire size of said wire to be at most 4 % and to set average grain size in transverse direction of said wire in said final wire size to be within a range of 1 to 5 µm.
- Such an invar type alloy wire has superior twisting property. Especially when the areal ratio of the precipitates existing at the grain boundary of the alloy is set to be at most 1 % by the combination of hot working and heat treatment, the areal ratio of the precipitates existing at the grain boundary of the alloy in the final wire size can be easily set to be at most 2 % by the subsequent combination of cold working and heat treatment, and hence an invar type alloy wire having significantly improved twisting property can be provided.
-
- A conventionally used invar type alloy wire having high strength contains, as main elements, Fe and Ni, and Co may partially substitute for Ni. Generally, such an invar type alloy wire having high strength contains at least one of Mo, Cr, C, W, Nb, Ti, V, Si or the like as strengthing element, and in addition, at least one of Mn, Al, Mg, Ti, Ca or the like as a deoxidizer.
- The inventors performed various investigations to eliminate instabilizing factors related to the toughness of such invar type alloy wire having high strength. As a result, it was found that crystal grain size of the wire, the amount of precipitates at the grain boundary and amount of specific impurity elements have significant effects on the toughness of the wire. It was also found that there is a preferable method of processing and heat treatment for controlling the grain size and the amount of precipitates at the grain boundary. The precipitates at the grain boundary here are often carbide.
- In order to reduce precipitates at the grain boundary in the final wire size of the wire, any of the following methods may be used: a method in which during hot rolling, cooling is started from solid solution temperature (cooling from the solid solution temperature may be considered to be a kind of heat treatment); a method in which solution heat treatment is performed prior to hot rolling; and a method in which solution heat treatment is performed after hot rolling. No matter which of the methods is employed, the smaller the amount of precipitates at the grain boundary after the combined hot working and heat treatment, the smaller the amount of precipitates at the grain boundary precipitated during subsequent cold working and heat treatment, and therefore the smaller the amount of precipitates existing at the grain boundary in the wire in the final wire size.
Element C Mn Ni Co Cr Mo P S O N Fe Wt % 0.25 0.30 35.0 3.01 0.98 2.01 0.002 0.001 0.0015 0.0013 remaining part - As an example, an invar type alloy having such a composition as shown in Table 1 was dissolved and cast.
Sample Rolling Start Temperature (°C) Cooling Rate (°C/sec) Areal Ratio of Precipitates at Grain Boundary (%) Average Grain size in Longitudinal Direction (µm) A 1200 10 0.2 22 B 1150 8 0.6 14 C 1100 7 0.9 5 D 1250 3 3.8 75 E 1200 5 2.8 59 - Table 2 shows the influence of the temperature at which rolling is started and the rate of cooling during rolling until the temperature reaches 600°C when the invar type alloy shown in Table 1 is subjected to hot rolling, on the average grain size in the longitudinal direction of the rod after rolling and on the areal ratio of the precipitates at the grain boundary. For measuring the areal ratio of the precipitates at the grain boundary, the rolled rod was cut along the longitudinal direction, the cut surface is polished and etched for 40 seconds by using 5 % nital solution, and the surface was photographed with the magnification of 4000 by using a scanning type electron microscope. The microphotograph was processed by an automatic image processing apparatus, the areal ratio of the precipitates existing at the grain boundary was calculated, and the average grain size in the longitudinal direction was calculated.
- As is apparent from Table 2, the average grain sizes in the longitudinal direction of samples A, B and C of which rate of cooling during hot working was relatively fast are within the range of 5 to 40 µm, and the areal ratio of the precipitates at the grain boundary is at most 2.0 %. Meanwhile, the grain sizes of samples D and E of which cooling rate during hot working was slow are far greater than 40 µm, and the areal ratio of precipitates at the grain boundary exceeds 2.0 %.
- Referring to Table 2, a billet having a square cross section of about 120 x 120 mm2 was passed through a plurality of shaping rolls and rolled to be a rod having a circular cross section of about 12 mm in diameter.
- Thereafter, all the samples A to E shown in Table 2 were subjected to first cold working, first heat treatment, scraping, second heat treatment and second cold working. As the first cold working, drawing with the degree of processing of about 30 % was performed by using a plurality of dies. The first heat treatment was performed in a non-oxidizing atmosphere such as in a decomposed ammonia gas containing 75 % by volume of H2 and 25 % by volume of N2, at 650°C for 10 hours. The samples softened by the first heat treatment were peeled by scraping dies, and then subjected to second heat treatment under the same condition as the first heat treatment. The samples softened by the second heat treatment were drawn to have the diameter of about 2 to 5 mm with the degree of processing of about 85 %, by passing through a plurality of dies, and thereafter the samples were dipped in Zn-5 wt % Al alloy melt. The average grain size in the transverse direction, areal ratio of precipitates at the grain boundary and various mechanical properties of the wires having final wire size obtained through these steps are as shown in Table 3. Referring to Table 3, samples 1A to 1E are the samples obtained from samples A to E of Table 2. The samples 1A to 1E all have similar tensile strength exceeding the target property of 120 kg/mm2. However, comparative examples 1D and 1E are inferior in twisting property and elongation as compared with samples 1A, 1B and 1C in accordance with the present invention.
- The twisting property is represented by the number of possible twisting (turns/100d) at about 60 rpm of a single wire having the length one hundred times the diameter d until it breaks. The reference character σ represents standard deviation of the turns of twisting of one hundred wires. The smaller the value σ, the higher the reliability, as the twisting property is stable.
- Referring to Table 3, the samples 1A and 1B of which areal ratio of precipitates at the grain boundary is at most 2.0 % and average grain size in the transverse direction is within the range of 1.5 to 4 µm have superior twisting property exceeding 100 turns, and they have high reliability as represented by the standard deviation σ of at most 10. The sample 1C of which areal ratio of the precipitates at the grain boundary exceeds 2 % but not higher than 4 % and the grain size in the cross sectional direction is within a range of 1 to 5 µm but not higher than 1.5 µm has slightly inferior twisting property as compared with samples 1A and 1B. However, it can still satisfy the target property in 3σ management. More specifically, for the sample 1C, 95-3σ=35 turns, and hence it satisfies the required property (≥ 16 turns/100d). Meanwhile, comparative examples 1D and 1E of which areal ratio of precipitates at the grain boundary exceeds 4 % and the grain size in the transverse direction exceeds 5 µm, the twisting property cannot satisfy the target property, in accordance with 3σ management. Further, in comparative examples 1D and 1E, though target elongation property (≥ 1.5 %) is satisfied, the elongation property is inferior to the samples 1A to 1C in accordance with the present invention. Especially, in comparative example 1D, breakage was observed during cold working.
- As already mentioned, samples 1A to 1E are obtained by performing same cold working and heat treatment on the hot worked samples A to E of Table 2. If would be understood that in order to obtain preferable twisting property, it is preferable that the areal ratio of the precipitates at the grain boundary in the rod after hot working is at most 2 % and the grain size in the longitudinal direction is within the range of 5 to 40 µm.
- Table 4 shows influence of the degree of processing of the first cold working and the temperature of immediately following first heat treatment on the areal ratio of the precipitates at the grain boundary and various mechanical properties of the wires in the final wire size. Referring to Table 4, first cold working with various degrees of processing and first heat treatment at various temperatures were performed on sample A of Table 2. The processes after the first heat treatment are the same as those described with reference to Table 3. Samples 1A to 7A all have similar tensile strength higher than the target property of 120 kg/mm2.
- However, while samples 1A to 6A belonging to the present invention of which areal ratio of the precipitates at the grain boundary in the final state is at most 4 % can satisfy the target value of the twisting property (≥ 16 turns/100d) even under 3σ management, the comparative example 7A of which areal ratio of the precipitates at the grain boundary in the final state exceeds 4 % cannot satisfy the target value of the twisting property under 3σ management (89-3σ=89-3x35<16 turns).
- Now, sample 4A is processed with the degree of processing of the first cold working being 80 %, exceeding 70 %, and hence the areal ratio of the precipitates at the grain boundary of the final state exceeds 2 %, though not higher than 4 %. Therefore, it is inferior to samples 1A to 3A in twisting property and elongation. In other words, the degree of processing of the first cold working should more preferably be at most 70 %.
- Further, for the sample 5A, temperature of the first heat treatment was 570°C, which was not higher than 600°C. Therefore, the amount of precipitates at the grain boundary was small. However, since the strain in the wire is not sufficiently removed, the turns of twisting vary as compared with samples 1A to 3A, and as a result, average turns of twisting is low and elongation is degraded. Namely, the temperature for the first heat treatment should more preferably be at least 600°C.
- Further, for the sample 6A, relatively large degree of processing of 70 % was set for the first cold working, and relatively high temperature of 700°C was set for the heat treatment. Therefore, the areal ratio of the precipitates at the grain boundary in the final state was larger as compared with samples 1A to 1C and, as a result, twisting property and elongation were degraded. Especially when the temperature for the first heat treatment exceeds 700°C, the areal ratio of the precipitates at the grain boundary in the final state exceeds 4 % as in comparative example 7A, and hence target twisting property (≥ 16 turns/100d) cannot be satisfied. In other words, the temperature for the first heat treatment should preferably be in the range of 600°C to 700°C.
- Table 5 shows influence of hot working, cold working and heat treatment on the average grain size in the transverse direction of the wire and twisting property of the wire in the final wire size. The alphabets (A) to (E) appended to the sample numbers of Table 5 represent that the samples are obtained by performing first cold working, first heat treatment, scraping, second cold working and Zn-5 wt % Al alloy plating on the hot worked samples A to E of Table 2. For each sample of Table 5, the temperature for the first and second heat treatments before and after scraping is set to be the same temperature.
- As can be seen from Table 5, samples 11 to 14 belonging to the present invention of which average grain size in the transverse direction in the final wire size is within the range of 1 to 5 µm can satisfy the target value of twisting property (≥ 16 turns/100d) even at the 3σ management. By contrast, comparative examples 15 to 17 of which grain size in the transverse direction is out of the range of 1 to 5 µm cannot satisfy the target value of twisting property at 3σ management.
- Now, for sample 14, the degree of processing in the first cold working was 80 %, which is higher than 70 %, so that the grain size in the transverse direction at the final state exceeds 4 %, though not higher than 5 %, and twisting property is inferior to samples 11 to 13. Therefore, the degree of processing of the first cold working should desirably be at most 70 %.
- The small grain size in the transverse direction of comparative example 15 may be related to small grain size in the longitudinal direction of sample C in Table 2. As compared with samples A and B, sample C has relatively large areal ratio of the precipitates at the grain boundary, and areal ratio of the precipitates at the grain boundary at the final wire size of sample 15 was increased to 4.4 %, even though the temperatures for the first and second heat treatments were relatively low.
- Further, in comparative example 17 having very large grain size in the transverse direction, breakage was observed during the second cold working.
- Then, alloys such as shown in Table 6 were melt and cast in order to see the influence of impurity on the invar type alloy wire. Referring to Table 6, numerical values related to respective elements denote percentage by weight in the alloy.
Sample Twisting Property (turns/100d) Tensile Strength (kg/mm2) Elongation (%) 100 wires average σ Present Invention 21 125 5 127 2.5 22 122 6 127 2.5 23 115 11 127 2.3 Comparative Example 24 75 20 127 2.0 25 96 27 126 2.1 26 74 22 126 1.9 27 48 25 125 1.7 Target Property ≧ 16 (turns/100d) ≧ 120 ≧ 1.5 - Table 7 shows various mechanical properties at the final wire size of the invar type alloy wires having such compositions as shown in Table 6.
- Of each of the samples having such compositions as shown in Table 6, a billet was heated to 1200°C, and thereafter cooled to about 600°C at the cooling rate of 10°C/sec, while it is rolled by shaping rolls. The obtained rolled rods were examined and it was found that every rod has the areal ratio of the precipitates at the grain boundary of about 0.2 % and average grain size of about 22 µm in the longitudinal direction.
- The rolled rods which were hot worked were all subjected to a first cold drawing of 22 %, scraping, heat treatment at 650°C for 10 hours, a second cold drawing of 86 % and plating with Zn-5 wt % Al alloy.
- Referring to Table 7, samples 21 to 27 all have similar tensile strength exceeding the target value of 120 kg/mm2. However, it is apparent that comparative examples 24 to 27 are inferior in twisting property and elongation as compared with the samples 21 to 23 belonging to the present invention.
- More specifically, samples 21 to 23 belonging to the present invention containing P of at most 0.01 percent by weight, S of at most 0.004 percent by weight, O of at most 0.005 percent by weight and N of at most 0.008 percent by weight have superior twisting property. Especially, samples 21 and 22 which include P of at most 0.005 percent by weight, S of at most 0.002 percent by weight O of at most 0.003 percent by weight and N of at most 0.006 percent by weight only as impurities have superior twisting property and stability (that is, small a).
- Comparative examples 24 to 27 all include at least one impurity of P exceeding 0.01 percent by weight, S exceeding 0.004 percent by weight O exceeding 0.005 percent by weight N exceeding 0.008 percent by weight, so that these examples are far inferior in twisting property to the samples 21 to 23 of the present invention, and target value (≥ 16 turns/100d) of the twisting property cannot be achieved.
- In any of the above described embodiments, various properties of the wire are hardly influenced when Mo of the alloy element is replaced by V, and hence V can be similarly used as Mo.
- As described above, according to the present invention, toughness, especially twisting property of an invar type alloy wire having high strength can be improved, and by using the same, production yield of overhead conductor cables can be improved.
- Although the present invention has been described and illustrated in detail, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation, the scope of the present invention being limited only by the terms of the appended claims.
Claims (10)
- An invar type alloy wire having high toughness, high strength and low thermal expansion property, containing, as main alloy element, Fe and Ni, wherein the average grain size in transverse direction of said wire in a final wire size is within a range of 1 to 5 µm; wherein the areal ratio of precipitates existing at grain boundary of said wire in said final wire size is at most 4 % and wherein impurity contained in said alloy is at most 0.01 percent in weight of P, at most 0.004 percent by weight of S, at most 0.005 percent of weight of O and at most 0.008 percent by weight of N.
- The invar type alloy wire according to claim 1, wherein areal ratio of said precipitates is at most 2 %.
- The invar type alloy wire according to claim 1, wherein average grain size in transverse direction of said wire in said final wire size is within a range of 1.5 to 4 µm.
- The invar type alloy wire according to claim 1, wherein part of Ni in said invar type alloy is replaced by Co.
- The invar type alloy wire according to claim 1, wherein said invar type alloy further contains, as strengthing element, at least one of Mo, Cr, C, W, Nb, Ti, V and Si.
- The invar type alloy wire according to claim 1, wherein said invar type alloy further contains, as deoxidizer, at least one of Mn, Al, Mg, Ti and Ca.
- The invar type alloy wire according to claim 1, wherein impurity contained in said alloy is at most 0.005 percent by weight of P, at most 0.002 percent by weight of S, at most 0.003 percent of weight of O and at most 0.006 percent by weight of N.
- A method of manufacturing an invar type alloy wire having high toughness, high strength and low thermal expansion property, comprising the steps of:preparing an invar type alloy containing, as main elements, Fe and Ni, wherein impurity contained in said alloy is at most 0.01 percent in weight of P, at most 0.004 percent by weight of S, at most 0.005 percent of weight of O and at most 0.008 percent by weight of N;performing hot working and heat treatment in combination to set areal ratio of precipitates existing at grain boundary of said alloy to be at most 2 % and to set average grain size in longitudinal direction of a rod shape processed by said hot working and heat treatment to be within a range of 5 to 40 µm ; and therafter, performing cold working and heat treatment in combination to set areal ratio of precipitates existing at the grain boundary of said alloy in final wire size of said wire to be at most 4 % and to set average grain size in transverse direction of said wire in said final wire size to be within a range of 1 to 5 µm.
- The method of manufacturing an invar type alloy wire according to claim 8, wherein areal ratio of said precipitates after said hot working and heat treatment in combination is set to be at most 1 % and areal ratio of said precipitates in said final wire size is set to be at most 2 %.
- The method of manufacturing an invar type alloy wire according to claim 8, wherein said alloy is subjected to a first cold working at a degree of processing of at most 70% after said hot working, and thereafter subjected to at least one heat treatment at a temperature within a range of 600 to 700°C.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP00823695A JP3447830B2 (en) | 1995-01-23 | 1995-01-23 | Invar alloy wire and method of manufacturing the same |
JP823695 | 1995-01-23 | ||
JP8236/95 | 1995-01-23 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0723025A1 EP0723025A1 (en) | 1996-07-24 |
EP0723025B1 true EP0723025B1 (en) | 2001-10-17 |
Family
ID=11687523
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP96100655A Expired - Lifetime EP0723025B1 (en) | 1995-01-23 | 1996-01-17 | Invar type alloy wire and manufacturing method thereof |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0723025B1 (en) |
JP (1) | JP3447830B2 (en) |
KR (1) | KR100204443B1 (en) |
DE (1) | DE69615874T2 (en) |
TW (1) | TW344075B (en) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
TW389794B (en) * | 1995-01-23 | 2000-05-11 | Daido Steel Co Ltd | High strength, low thermal expansion alloy wire and method of making the wire |
DE19944578C2 (en) * | 1999-09-17 | 2001-08-23 | Krupp Vdm Gmbh | Use of a low-expansion iron-nickel alloy with special mechanical properties |
JP4797305B2 (en) * | 2001-09-13 | 2011-10-19 | 住友電気工業株式会社 | Invar alloy wire with excellent strength and twisting characteristics and manufacturing method thereof |
FR2855185B1 (en) * | 2003-05-21 | 2006-08-11 | Usinor | FE-NI ALLOY METAL WIRE HAVING HIGH MECHANICAL STRENGTH AND LOW THERMAL EXPANSION COEFFICIENT FOR HIGH VOLTAGE CABLES AND METHOD OF MANUFACTURE |
RU2468108C1 (en) * | 2011-10-28 | 2012-11-27 | Федеральное государственное унитарное предприятие "Центральный научно-исследовательский институт черной металлургии им. И.П. Бардина" (г. Москва) ФГУП ЦНИИчермет им. И.П. Бардина | Corrosion-resistant high-strength invar alloy |
CN113718182B (en) * | 2021-08-30 | 2022-06-17 | 无锡华能电缆有限公司 | Zinc-aluminum coating invar steel single wire and preparation method thereof |
CN114086086B (en) * | 2021-11-05 | 2022-07-15 | 河钢股份有限公司 | Nano-phase carbon-nitrogen composite particle reinforced invar alloy wire and preparation method thereof |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0723030A1 (en) * | 1995-01-23 | 1996-07-24 | Daido Steel Company Limited | High strength, low thermal expansion alloy wire and method of making the wire |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6032928B2 (en) * | 1978-04-14 | 1985-07-31 | 住友電気工業株式会社 | Composite stranded wire |
JPS55119156A (en) * | 1979-03-09 | 1980-09-12 | Sumitomo Electric Ind Ltd | High strength and low expansion alloy |
JPS57110659A (en) * | 1980-12-26 | 1982-07-09 | Sumitomo Electric Ind Ltd | Zinc plated, high strength and low expansion alloy wire and its manufacture |
JPH04224630A (en) * | 1990-12-25 | 1992-08-13 | Nikko Kyodo Co Ltd | Manufacture of lead frame material |
JPH0570894A (en) * | 1991-09-17 | 1993-03-23 | Hitachi Metals Ltd | Alloy wire having high strength and low thermal expansion and excellent in twisting characteristic and its production |
-
1995
- 1995-01-23 JP JP00823695A patent/JP3447830B2/en not_active Expired - Lifetime
- 1995-12-01 TW TW084112829A patent/TW344075B/en not_active IP Right Cessation
-
1996
- 1996-01-17 DE DE69615874T patent/DE69615874T2/en not_active Expired - Lifetime
- 1996-01-17 EP EP96100655A patent/EP0723025B1/en not_active Expired - Lifetime
- 1996-01-22 KR KR1019960001246A patent/KR100204443B1/en not_active IP Right Cessation
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0723030A1 (en) * | 1995-01-23 | 1996-07-24 | Daido Steel Company Limited | High strength, low thermal expansion alloy wire and method of making the wire |
Also Published As
Publication number | Publication date |
---|---|
DE69615874D1 (en) | 2001-11-22 |
JPH08199308A (en) | 1996-08-06 |
EP0723025A1 (en) | 1996-07-24 |
TW344075B (en) | 1998-11-01 |
DE69615874T2 (en) | 2002-04-11 |
JP3447830B2 (en) | 2003-09-16 |
KR960029474A (en) | 1996-08-17 |
KR100204443B1 (en) | 1999-06-15 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CN114645165B (en) | Aluminum alloy material, and fastening member, structural member, spring member, conductive member, and battery member each made of the same | |
JP6758746B2 (en) | Copper alloys for electronic / electrical equipment, copper alloy strips for electronic / electrical equipment, parts for electronic / electrical equipment, terminals, and bus bars | |
EP2157200B1 (en) | Al-Mg-Si aluminum alloy extruded product exhibiting excellent fatigue strength and impact fracture resistance | |
KR101677310B1 (en) | Copper alloy wire and process for producing same | |
CN110546292B (en) | High-strength low-thermal expansion alloy wire | |
JP7014211B2 (en) | Copper alloys for electronic / electrical equipment, copper alloy strips for electronic / electrical equipment, parts for electronic / electrical equipment, terminals, and bus bars | |
CN111263825B (en) | Movable cable | |
US20190017150A1 (en) | Cr Filament-Reinforced CrMnFeNiCu(Ag)-Based High-Entropy Alloy and Method for Manufacturing the Same | |
US10056166B2 (en) | Copper-cobalt-silicon alloy for electrode material | |
CN110468306B (en) | Aluminum alloy wire and method for producing same | |
DE60206464T2 (en) | Ni alloy with improved oxidation resistance, hot strength and hot workability | |
CN107849670B (en) | Method for manufacturing aluminum alloy wire and aluminum alloy wire | |
EP0723025B1 (en) | Invar type alloy wire and manufacturing method thereof | |
KR100409193B1 (en) | High strength, low thermal expansion alloy wire and manufacturing method thereof | |
JP2021080519A (en) | α+β TYPE TITANIUM ALLOY ROD STOCK, AND MANUFACTURING METHOD OF α+β TYPE TITANIUM ALLOY ROD STOCK | |
US20050039827A1 (en) | Copper alloy having excellent corrosion cracking resistance and dezincing resistance, and method for producing same | |
CN111378869B (en) | Fine-grain reinforced brass strip for connector and processing method thereof | |
US6165627A (en) | Iron alloy wire and manufacturing method | |
EP1508625B1 (en) | Copper alloy having excellent corrosion cracking resistance and dezincing resistance, and method for producing same | |
JPH10183287A (en) | Aluminum alloy for cold forging and its production | |
JPH10140267A (en) | Copper alloy material with high cr content, having high strength and high electric conductivity, and its production | |
JP2022138809A (en) | Invar alloy and Invar alloy wire | |
KR20220132546A (en) | Aluminum alloy, aluminum alloy wire, aluminum alloy member and bolt | |
DE102016223430A1 (en) | Electric cable made of aluminum alloy and wiring harness | |
JPH08199238A (en) | Production of wire rod of high strength and low thermal expansion alloy |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): DE FR GB SE |
|
17P | Request for examination filed |
Effective date: 19960717 |
|
17Q | First examination report despatched |
Effective date: 19990322 |
|
GRAG | Despatch of communication of intention to grant |
Free format text: ORIGINAL CODE: EPIDOS AGRA |
|
GRAG | Despatch of communication of intention to grant |
Free format text: ORIGINAL CODE: EPIDOS AGRA |
|
GRAH | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOS IGRA |
|
GRAH | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOS IGRA |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): DE FR GB SE |
|
REF | Corresponds to: |
Ref document number: 69615874 Country of ref document: DE Date of ref document: 20011122 |
|
REG | Reference to a national code |
Ref country code: GB Ref legal event code: IF02 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: SE Payment date: 20020124 Year of fee payment: 7 |
|
ET | Fr: translation filed | ||
PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
26N | No opposition filed | ||
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: SE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20030118 |
|
EUG | Se: european patent has lapsed | ||
REG | Reference to a national code |
Ref country code: GB Ref legal event code: 732E |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: TP |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: FR Payment date: 20120202 Year of fee payment: 17 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 20120111 Year of fee payment: 17 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: GB Payment date: 20120111 Year of fee payment: 17 |
|
GBPC | Gb: european patent ceased through non-payment of renewal fee |
Effective date: 20130117 |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: ST Effective date: 20130930 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20130801 |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R119 Ref document number: 69615874 Country of ref document: DE Effective date: 20130801 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: FR Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20130131 Ref country code: GB Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20130117 |