CN111793770A - Prestressed steel core for overhead conductor and preparation method thereof - Google Patents
Prestressed steel core for overhead conductor and preparation method thereof Download PDFInfo
- Publication number
- CN111793770A CN111793770A CN202010454380.1A CN202010454380A CN111793770A CN 111793770 A CN111793770 A CN 111793770A CN 202010454380 A CN202010454380 A CN 202010454380A CN 111793770 A CN111793770 A CN 111793770A
- Authority
- CN
- China
- Prior art keywords
- steel core
- steel
- temperature
- wire
- aluminum alloy
- 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.)
- Pending
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 193
- 239000010959 steel Substances 0.000 title claims abstract description 193
- 239000004020 conductor Substances 0.000 title claims abstract description 62
- 238000002360 preparation method Methods 0.000 title claims abstract description 13
- 229910000838 Al alloy Inorganic materials 0.000 claims abstract description 37
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 26
- 239000000956 alloy Substances 0.000 claims abstract description 26
- 238000000034 method Methods 0.000 claims abstract description 18
- 229910052691 Erbium Inorganic materials 0.000 claims abstract description 15
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 15
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 15
- 229910052802 copper Inorganic materials 0.000 claims abstract description 12
- 239000012535 impurity Substances 0.000 claims abstract description 12
- 230000008569 process Effects 0.000 claims abstract description 10
- 238000007747 plating Methods 0.000 claims description 59
- 238000001816 cooling Methods 0.000 claims description 46
- 238000001035 drying Methods 0.000 claims description 28
- 238000003723 Smelting Methods 0.000 claims description 25
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 25
- 239000002994 raw material Substances 0.000 claims description 15
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 14
- 239000003795 chemical substances by application Substances 0.000 claims description 14
- 229910052593 corundum Inorganic materials 0.000 claims description 14
- 238000005098 hot rolling Methods 0.000 claims description 14
- 229910044991 metal oxide Inorganic materials 0.000 claims description 14
- 150000004706 metal oxides Chemical class 0.000 claims description 14
- 238000007670 refining Methods 0.000 claims description 14
- 229910001845 yogo sapphire Inorganic materials 0.000 claims description 14
- 239000011248 coating agent Substances 0.000 claims description 11
- 238000000576 coating method Methods 0.000 claims description 11
- 238000004140 cleaning Methods 0.000 claims description 9
- 238000003837 high-temperature calcination Methods 0.000 claims description 9
- 229910000611 Zinc aluminium Inorganic materials 0.000 claims description 8
- 230000009471 action Effects 0.000 claims description 8
- HXFVOUUOTHJFPX-UHFFFAOYSA-N alumane;zinc Chemical compound [AlH3].[Zn] HXFVOUUOTHJFPX-UHFFFAOYSA-N 0.000 claims description 8
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 7
- 238000005266 casting Methods 0.000 claims description 7
- 239000000919 ceramic Substances 0.000 claims description 7
- 238000005238 degreasing Methods 0.000 claims description 7
- 229910052742 iron Inorganic materials 0.000 claims description 7
- 238000012545 processing Methods 0.000 claims description 7
- 238000004506 ultrasonic cleaning Methods 0.000 claims description 7
- 238000005406 washing Methods 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 238000005491 wire drawing Methods 0.000 claims description 7
- 239000011592 zinc chloride Substances 0.000 claims description 7
- 238000009987 spinning Methods 0.000 claims description 5
- 239000002253 acid Substances 0.000 claims description 2
- 239000000155 melt Substances 0.000 claims description 2
- 229910052751 metal Inorganic materials 0.000 claims description 2
- 239000002184 metal Substances 0.000 claims description 2
- 150000002739 metals Chemical class 0.000 claims description 2
- 238000005096 rolling process Methods 0.000 claims description 2
- 230000001360 synchronised effect Effects 0.000 claims description 2
- 239000003973 paint Substances 0.000 claims 3
- 238000005260 corrosion Methods 0.000 abstract description 9
- 230000007797 corrosion Effects 0.000 abstract description 9
- 238000005275 alloying Methods 0.000 abstract description 2
- 239000011162 core material Substances 0.000 description 89
- 239000010410 layer Substances 0.000 description 32
- 229910052782 aluminium Inorganic materials 0.000 description 22
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 22
- 238000005246 galvanizing Methods 0.000 description 20
- 238000005242 forging Methods 0.000 description 15
- 230000005540 biological transmission Effects 0.000 description 11
- 239000000047 product Substances 0.000 description 9
- 238000012360 testing method Methods 0.000 description 9
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 7
- 229910052725 zinc Inorganic materials 0.000 description 7
- 239000011701 zinc Substances 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 5
- 239000012467 final product Substances 0.000 description 5
- 238000002844 melting Methods 0.000 description 5
- 230000008018 melting Effects 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 238000005554 pickling Methods 0.000 description 5
- 238000003756 stirring Methods 0.000 description 5
- 229910001335 Galvanized steel Inorganic materials 0.000 description 4
- 239000008397 galvanized steel Substances 0.000 description 4
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical group [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 230000001965 increasing effect Effects 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 238000004804 winding Methods 0.000 description 3
- 230000007774 longterm Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 229910000797 Ultra-high-strength steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- JIAARYAFYJHUJI-UHFFFAOYSA-L zinc dichloride Chemical compound [Cl-].[Cl-].[Zn+2] JIAARYAFYJHUJI-UHFFFAOYSA-L 0.000 description 1
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
- C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
-
- 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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- 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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- 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
-
- 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
- C22C38/20—Ferrous alloys, e.g. steel alloys containing chromium with copper
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
- C23C2/06—Zinc or cadmium or alloys based thereon
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
- C23C2/36—Elongated material
- C23C2/38—Wires; Tubes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/0016—Apparatus or processes specially adapted for manufacturing conductors or cables for heat treatment
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/02—Stranding-up
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B5/00—Non-insulated conductors or conductive bodies characterised by their form
- H01B5/08—Several wires or the like stranded in the form of a rope
Abstract
The invention discloses a prestressed steel core for an overhead conductor and a preparation method thereof, wherein the prestressed steel core for the overhead conductor comprises the following components in percentage by weight: c: 0.82 wt%, Si: 0.20 wt%, P: 0.005 wt%, S: 0.003 wt%, Cu: 0.05 wt%, Mn: 0.45 wt%, Cr: 0.15 wt%, Er: 0.08 wt%, the balance being Fe and inevitable other impurities. According to the prestressed steel core for the overhead conductor, the alloy components and the microstructure thereof are optimized and controlled by using Cr, Mn and Er trace alloying elements, and meanwhile, the process parameters during steel core prestress treatment are optimized, so that the prepared galvanized aluminum alloy layer prestressed steel core is ensured to have good mechanical comprehensive performance and corrosion resistance.
Description
Technical Field
The invention relates to the field of core wire materials for overhead conductors, and particularly provides a prestressed steel core for an overhead conductor and a preparation method thereof.
Background
In order to meet the power load requirements of users, power grid enterprises continuously increase the newly-built and improved strength of power transmission lines, and strive to ensure safe and reliable supply of electric energy. However, with the high-speed development of urban construction in China, land resources are more and more strained, and the selection of an overhead transmission line corridor is greatly restricted. Due to the rapid increase of the power load in part of regions, the original power transmission line can not bear the demand of the increase of the power load, and power failure and outage faults caused by overload occur occasionally, so that the safe operation of a power grid is greatly influenced. In some areas along the east coast of China, because of developed economy, dense population and precious land resources, the load of a power transmission line channel is heavier and heavier, and the new line corridor is difficult to plan and construct. Therefore, the capacity-increasing transformation by using the original power transmission line corridor and the tower thereof becomes one of the ideal schemes for capacity-increasing of the lines in the residential dense area at present. The existing steel-cored aluminum strand is made of hard aluminum conductor materials, so that the heat resistance is poor, the current-carrying capacity is low, and for long-distance power transmission, urban power grid and rural power grid transformation projects, in order to enlarge a power transmission system, the existing steel-cored aluminum strand is adopted, the cross section of a wire must be increased, all towers need to be replaced, and the steel-cored aluminum strand is rebuilt, so that the line positioned in a residential dense area is difficult to realize. Therefore, increasing the transmission capacity by replacing the capacity-increasing wire with the same cross-sectional area becomes one of the effective technologies, and research on the development of a novel capacity-increasing wire and application technology thereof on the power transmission line are receiving more and more attention.
In order to improve the transmission capacity of the transmission line, steel-cored soft aluminum stranded wires were first developed in the united states and canada in the last 70 th century. The steel-cored soft aluminum stranded wire is a capacity-increasing wire which takes soft aluminum single-wire stranded wires as a conductor and takes an ultrahigh-strength steel core as a reinforcing core. The steel core soft aluminum stranded wire is mainly characterized in that the steel core completely bears the mechanical load of the wire, the aluminum strand mainly contributes to the wire to bear current but not bear the mechanical load, so the operating temperature of the wire is not limited by the softening property of the aluminum strand and is completely determined by the softening property of steel, the recrystallization temperature of the steel is higher, the normal mechanical strength can be kept at higher temperature, and the allowable operating temperature of the wire is higher than that of the common steel core aluminum stranded wire. At present, a steel core bearing the mechanical load of a wire is generally made of a high-strength galvanized steel wire. However, the corrosion resistance of the galvanized steel wire is poor, and the service requirement of a severe corrosion environment is more and more difficult to meet. The prestressed steel core for the overhead conductor is a low-relaxation and high-strength prestressed steel strand prepared by adopting a prestress treatment technology. Compared with the traditional steel core, the steel core has the advantages of high strength, good anti-relaxation performance, large structural rigidity, good stability and the like. The stress-strain curve of the prestressed steel core for the overhead conductor in the stress stage keeps an approximate linear relation, namely, the prestressed steel core has low stress relaxation property and small stress relaxation rate, so that the conductor using the prestressed steel core as the reinforced core has excellent low sag property. The prestressed steel core soft aluminum conductor for the overhead conductor is stranded by utilizing the prestressed steel core for the overhead conductor and the soft aluminum conductor, at the operating temperature of the lead, when the lead is under the action of tension, the soft aluminum wire is in a permanent extension state within the range of maximum breaking force and basically not stressed, the mechanical load can be regarded as being borne by the prestressed steel core for the overhead lead, therefore, the low relaxation characteristic of the prestressed steel core for the overhead conductor enables the prestressed steel core soft aluminum conductor for the overhead conductor to still have the low sag characteristic when running at high temperature, the temperature resistance grade of the prestressed steel core for the overhead conductor is the temperature resistance grade of the conductor, the allowable long-term operation temperature of the prestressed steel core soft aluminum conductor for the overhead conductor can reach more than 150 ℃, and the allowable long-term operation temperature of the common steel core aluminum stranded conductor is generally below 70-90 ℃, so that the prestressed steel core soft aluminum conductor for the overhead conductor has a good conductor capacity increasing effect. The Shanghai Cable research institute company Limited applies a prestress treatment technology to the preparation of steel core soft aluminum conductors for the first time at home and abroad in 2008, and firstly provides a manufacturing technology of prestressed steel core soft aluminum compatibilized conductors for overhead conductors, wherein the prestressed steel core for the overhead conductors is a prestressed galvanized steel core, and the tensile strength of the prestressed steel core is in the level of 1720-1860 MPa. Therefore, in order to further improve the tensile strength of the prestressed steel core for the overhead conductor, the prestressed steel core soft aluminum conductor for the overhead conductor has excellent low sag property, the corrosion resistance of the prestressed steel core for the overhead conductor is improved, the safety level and the technical economy of the conductor are improved, and the prestressed steel core for the overhead conductor with higher strength, lower relaxation property and higher corrosion resistance is urgently needed to be researched so as to meet the research, development and application requirements of the prestressed steel core soft aluminum capacity-increasing conductor for the high-performance overhead conductor.
Disclosure of Invention
In view of the above, the invention aims to provide a high tensile strength, good elongation and stress relaxation for overhead conductors in the power industryThe prestressed steel core with low relaxation rate solves the technical problem that the key performance indexes of the steel core, such as tensile strength, elongation, stress relaxation rate and the like, are difficult to synergistically improve. The prestressed steel core for the extra-high strength overhead conductor with excellent comprehensive mechanical properties is developed by adding Cr, Mn and Er microalloying elements to optimize and control alloy components and microstructures thereof and optimizing prestress treatment process parameters, wherein the tensile strength is more than or equal to 2000MPa, the elongation is more than or equal to 5.0 percent, the 1000h stress relaxation rate is less than or equal to 2.0 percent, and the quality of a zinc-aluminum alloy coating is more than or equal to 305g/m2And the winding test is passed by 4 times (the diameter of the mandrel is 4 times of the diameter D of the steel wire), and the twisting times are more than or equal to 14 times.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a prestressed steel core for an overhead conductor, which comprises the following components in percentage by weight:
c: 0.05 to 1.00 wt%, Si: 0.05-0.20 wt%, P is less than or equal to 0.01 wt%, S is less than or equal to 0.01 wt%, Cu is less than or equal to 0.2 wt%, Mn: 0.001 to 1.00 wt%, Cr: 0.001-1.00 wt%, Er: 0.001 to 1.00 wt%, and the balance of Fe and inevitable impurities.
Preferably, the prestressed steel core for the overhead conductor comprises the following components in percentage by weight:
c: 0.07 to 0.90 wt%, Si: 0.05-0.15 wt%, P is less than or equal to 0.005 wt%, S is less than or equal to 0.005 wt%, Cu is less than or equal to 0.1 wt%, Mn: 0.10-1.00 wt%, Cr: 0.01-1.00 wt%, Er: 0.01 to 1.0 wt%, and the balance of Fe and inevitable other impurities.
Further preferably, the prestressed steel core for the overhead conductor comprises the following components in percentage by weight:
c: 0.83 wt%, Si: 0.12 wt%, P: 0.003 wt%, S: 0.001 wt%, Cu: 0.03 wt%, Mn: 0.65 wt%, Cr: 0.25 wt%, Er: 0.05 wt%, the balance being Fe and unavoidable other impurities.
The invention also provides a preparation method of the prestressed steel core for the overhead conductor, which comprises the following steps:
(1) raw material preparation and smelting
Mixing the raw materialsDrying at 100-150 ℃ for 1.0-2.0 h; the raw materials are dried and then smelted in a vacuum smelting furnace, other alloy elements are added after iron is melted during smelting, the alloy elements are completely melted and uniformly stirred, wherein the vacuum smelting temperature is 1100-1300 ℃, and the vacuum degree is less than or equal to 10-1Pa；
(2) Electroslag refining and remelting
Refining the melt obtained in the step (1) at 1100-1250 ℃ for 1.0-3.0 h, and casting into an electroslag ingot; then, carrying out electroslag remelting on the electroslag ingot, charging, arc striking and slagging, smelting, feeding and cooling to obtain a steel billet;
(3) high temperature calcination and hot rolling
Keeping the temperature of a steel billet at 1100-1200 ℃ for 1.0-2.0 h, then carrying out high-temperature calcination, and then carrying out hot rolling forming to obtain a wire rod, wherein the initial rolling temperature is controlled at 1100-1150 ℃, the temperature of a rolled piece entering a finishing mill is controlled at 850-950 ℃, the wire rod spinning temperature is controlled at 750-850 ℃, the wire rod cooling speed is controlled at 5-20 ℃/s, the wire rod is cooled to 500-550 ℃, and the wire rod is cooled to room temperature after being kept for 30-60 s;
(4) drawing process
Carrying out acid cleaning, derusting and phosphating on the wire rod prepared in the step (3), and then carrying out multi-pass drawing processing on the wire rod by using a wire drawing machine at the speed of 2.5-4 m/s and the deformation of 10-20%, wherein the drawing temperature is controlled at 30-50 ℃ to prepare a steel wire;
(5) hot dip zinc-aluminium alloy coating
Degreasing and cleaning the surface of the steel wire manufactured by drawing in the step (4) by using an ultrasonic cleaning tank; immersing the steel wire into the plating assistant agent solution at the speed of 10-20 m/min, wherein the plating assistant temperature is 50-100 ℃, and the plating assistant time is 20-40 s, and then drying the plating assistant agent remained on the surface of the steel wire, wherein the drying temperature is 80-100 ℃, and the drying time is 10-20 s; after being dried, the steel wire is immediately immersed into a ceramic plating pot filled with a zinc-aluminum alloy plating solution for dip plating, a galvanized aluminum alloy layer is generated on the surface of the steel wire by utilizing rapid synchronous deformation of multiple metals, and the dip plating time is controlled to ensure that the quality of the galvanized aluminum alloy layer is not less than 305g/m2；
(6) Strand twisting
Washing 7 strands of galvanized aluminum alloy layer steel wires prepared in the step (5) with absolute ethyl alcohol for 3-5 times, naturally airing, placing the 7 strands of washed steel wires in a stranding machine, stranding to form a steel core consisting of 7 strands of steel wires, and enabling the stranding force to be 55-65 MPa;
(7) prestressing treatment
Carrying out prestress treatment on the galvanized aluminum alloy layer steel core obtained in the step (6) under the tension action of 5-8 kN at the temperature of 180-220 ℃, wherein the speed is 20-30 m/min;
(8) taking up and finished product
And cooling the steel core of the zinc-plated aluminum alloy layer after the pre-stress treatment to room temperature, and then taking up the steel core by using a take-up machine to obtain the product.
Preferably, in the step (3), the diameter of the prepared wire rod is 11.0 mm.
Further preferably, in the step (4), the diameter of the steel wire is 3.08 mm.
Further preferably, in the step (5), the plating assistant solution comprises the following components: ZnCl250 to 75 parts by weight of KOH 5 to 15 parts by weight of NH45-15 parts of Cl and 5-15 parts of metal oxide.
More preferably, the metal oxide is formed from ZnO and Al2O3Made of a combination of ZnO and Al2O3The weight percentage of the component (A) is 1: 1-3: 1.
Further preferably, in the step (6), the diameter of a traction wheel of a tube stranding machine used for stranding is 1.6 m; the steel core lay length is 154mm, and the lay direction is left.
Further preferably, in the step (8), the steel core of the zinc-aluminum alloy coated layer after the pre-stress treatment in the step (7) is cooled by air cooling and water cooling.
Compared with the prior art, the technical scheme provided by the invention has the following beneficial effects:
according to the prestress steel core for the overhead conductor, provided by the invention, the alloy components and the microstructure of the alloy components are optimized and controlled by utilizing Cr, Mn and Er trace alloying elements, and meanwhile, the process parameters during steel core prestress treatment are optimized, so that the prepared prestress steel core with the galvanized aluminum alloy layer has good mechanical comprehensive performance and corrosion resistance.
The prestressed steel core for the overhead conductor provided by the invention has the tensile strength of more than or equal to 2000MPa, the elongation of more than or equal to 5.0 percent, the 1000h stress relaxation rate of less than or equal to 2.0 percent, and the quality of a zinc-aluminum alloy coating of more than or equal to 300g/m2And the winding test is passed by 4 times (the diameter of the mandrel is 4 times of the diameter D of the steel wire), and the twisting times are more than or equal to 14 times.
Detailed Description
The invention will be further explained with reference to specific embodiments, without limiting the invention.
Example 1
The prestressed steel core for the overhead conductor comprises the following components in percentage by weight: c: 0.82 wt%, Si: 0.20 wt%, P: 0.005 wt%, S: 0.003 wt%, Cu: 0.05 wt%, Mn: 0.45 wt%, Cr: 0.15 wt%, Er: 0.08 wt%, the balance being Fe and inevitable other impurities.
The preparation method of the steel core comprises the following steps:
(1) preparing and smelting raw materials: drying the raw materials at 100 ℃ for 2.0 h; in a vacuum smelting furnace at 1150 deg.C and vacuum degree less than or equal to 10-1Pa, adding other alloy elements after the iron is melted, completely melting the alloy elements and uniformly stirring the mixture;
(2) electroslag refining and remelting: refining at 1200 deg.C for 2.0h, and casting into electroslag ingot; carrying out electroslag remelting on the electroslag ingot, and obtaining a steel billet ingot through furnace charging, arc striking and slagging, smelting, feeding and cooling;
(3) high-temperature calcination and hot rolling: keeping the temperature at 1200 ℃ for 1.5h, forging, and hot-rolling a square billet into a finished product
The steel wire rod is subjected to initial forging at the temperature of 1150 ℃ and final forging at the temperature of 950 ℃; controlling the wire spinning temperature at 800 ℃; controlling the cooling speed of the wire at 10 ℃/s, cooling to 550 ℃, keeping the temperature for 30s, and then cooling to room temperature;
(4) drawing treatment: after pickling and derusting and phosphating the wire rod, carrying out multi-pass drawing processing on the wire rod by a wire drawing machine at the speed of 3.0m/s and the deformation of 10 percent, and controlling the drawing temperature at 35 ℃ to prepare a steel wire with the diameter of 3.08 mm;
(5) hot galvanizing aluminum alloy coating: degreasing and cleaning the surface of the drawn steel wire by using an ultrasonic cleaning tank; the steel wire is immersed into the plating assistant agent solution at the speed of 20m/min, the plating assistant temperature is 80 ℃, and the plating assistant time is 20 s. The plating assistant solution comprises the following components: ZnCl265 parts by weight of KOH 15 parts by weight of NH410 parts of Cl and 10 parts of metal oxide. The metal oxide is made of ZnO and Al2O3Made of a combination of ZnO and Al2O3The weight percentage of (A) is 1: 1. Drying the plating assistant agent remained on the surface of the steel wire at the drying temperature of 100 ℃ for 10 s; after drying, immerging the steel wire into a ceramic galvanizing pot containing zinc plating solution for dip plating to generate a galvanizing coat on the surface of the steel wire, and controlling the dip plating time to ensure that the quality of the galvanizing coat is 306g/m2；
(6) Stranding: washing 7 strands of prepared hot-dip galvanized aluminum alloy layer steel wires with absolute ethyl alcohol for 3 times, naturally airing, placing 7 strands of washed steel wires in a stranding machine, stranding to form a steel core consisting of 7 strands of steel wires, and enabling the stranding force to be 65 MPa; in the twisting process, in order to ensure good straightness of the steel core, the diameter of a traction wheel of a tube strander is 1.6 m; the steel core lay length is 154mm, and the lay direction is left.
(7) Pre-stress treatment: carrying out prestress treatment on a steel core of a galvanized aluminum alloy layer at the temperature of 220 ℃ and under the tension action of 5.0kN, wherein the speed is 30 m/min;
(8) taking up and obtaining a finished product: and cooling the steel core with the pre-stressed galvanized aluminum alloy layer to room temperature in an air cooling and water cooling mode, and taking up wires by using a take-up machine to obtain a final product.
Example 2
The prestressed steel core for the overhead conductor comprises the following components in percentage by weight: c: 0.83 wt%, Si: 0.15 wt%, P: 0.005 wt%, S: 0.002 wt%, Cu: 0.03 wt%, Mn: 0.50 wt%, Cr: 0.20 wt%, Er: 0.06 wt%, the balance being Fe and unavoidable other impurities.
The preparation method of the steel core comprises the following steps:
(1) preparing and smelting raw materials: drying the raw materials at 150 ℃ for 1.0 h; in a vacuum smelting furnace at 1200 ℃, the vacuum degree is less than or equal to 10-1Pa, adding other alloy elements after the iron is melted, completely melting the alloy elements and uniformly stirring the mixture;
(2) electroslag refining and remelting: refining at 1160 deg.C for 2.0h, and casting into electroslag ingot; carrying out electroslag remelting on the electroslag ingot, and obtaining a steel billet ingot through furnace charging, arc striking and slagging, smelting, feeding and cooling;
(3) high-temperature calcination and hot rolling: keeping the temperature of 1150 ℃ for 1.5h, forging and hot rolling the square billet into
The initial forging temperature of the wire rod is 1100 ℃, and the final forging temperature is 950 ℃; controlling the wire spinning temperature at 750 ℃; controlling the cooling speed of the wire at 15 ℃/s, cooling to 530 ℃, keeping the temperature for 60s, and then air-cooling to room temperature;
(4) drawing treatment: after pickling and derusting and phosphating the wire rod, carrying out multi-pass drawing processing on the wire rod by a wire drawing machine at the speed of 3.5m/s and the deformation of 20 percent, and controlling the drawing temperature at 50 ℃ to obtain a steel wire with the diameter of 3.08 mm;
(5) hot galvanizing aluminum alloy coating: degreasing and cleaning the surface of the drawn steel wire by using an ultrasonic cleaning tank; and (3) immersing the steel wire into the plating assistant agent solution at the speed of 15m/min, wherein the plating assistant temperature is 70 ℃, and the plating assistant time is 30 s. The plating assistant solution comprises the following components: ZnCl2: 75 parts by weight, KOH: 10 parts by weight of NH4Cl:10 parts by weight, metal oxide: 5 parts by weight. The metal oxide is made of ZnO and Al2O3Made of a combination of ZnO and Al2O3The weight percentage of (A) is 2: 1. Drying the plating assistant agent remained on the surface of the steel wire at the drying temperature of 80 ℃ for 20 s; after drying, immerging the steel wire into a ceramic galvanizing pot containing zinc plating solution for dip plating to generate a galvanizing layer on the surface of the steel wire, and controlling the dip plating time to ensure that the quality of the galvanizing layer is 307g/m2；
(6) Stranding: washing 7 strands of prepared hot-dip galvanized aluminum alloy layer steel wires with absolute ethyl alcohol for 5 times, naturally airing, placing 7 strands of washed steel wires in a stranding machine, stranding to form a steel core consisting of 7 strands of steel wires, and enabling the stranding force to be 60 MPa; in the twisting process, in order to ensure good straightness of the steel core, the diameter of a traction wheel of a tube strander is 1.6 m; the steel core lay length is 154mm, and the lay direction is left.
(7) Pre-stress treatment: carrying out prestress treatment on a steel core of a galvanized aluminum alloy layer at the temperature of 200 ℃ and under the tension action of 6.0kN, wherein the speed is 25 m/min;
(8) taking up and obtaining a finished product: and cooling the steel core with the pre-stressed galvanized aluminum alloy layer to room temperature in an air cooling and water cooling mode, and taking up wires by using a take-up machine to obtain a final product.
Example 3
The prestressed steel core for the overhead conductor comprises the following components in percentage by weight: c: 0.83 wt%, Si: 0.12 wt%, P: 0.003 wt%, S: 0.001 wt%, Cu: 0.03 wt%, Mn: 0.65 wt%, Cr: 0.25 wt%, Er: 0.05 wt%, the balance being Fe and unavoidable other impurities.
The preparation method of the steel core comprises the following steps:
(1) preparing and smelting raw materials: drying the raw materials at 120 ℃ for 1.0 h; in a 1300 ℃ vacuum smelting furnace, the vacuum degree is less than or equal to 10-1Pa, adding other alloy elements after the iron is melted, completely melting the alloy elements and uniformly stirring the mixture;
(2) electroslag refining and remelting: refining at 1250 deg.C for 1.0h, and casting into electroslag ingot; carrying out electroslag remelting on the electroslag ingot, and obtaining a steel billet ingot through furnace charging, arc striking and slagging, smelting, feeding and cooling;
(3) high-temperature calcination and hot rolling: keeping the temperature at 1200 ℃ for 1.0h, forging, and hot-rolling a square billet into a finished product
The steel wire rod is subjected to initial forging at the temperature of 1150 ℃ and final forging at the temperature of 950 ℃; the wire laying temperature is controlled at 850 DEG C(ii) a Controlling the cooling speed of the wire at 20 ℃/s, cooling to 500 ℃, keeping the temperature for 30s, and then cooling to room temperature;
(4) drawing treatment: after pickling and derusting and phosphating the wire rod, carrying out multi-pass drawing processing on the wire rod by a wire drawing machine at the speed of 4.0m/s and the deformation of 10 percent, and controlling the drawing temperature at 30 ℃ to obtain a steel wire with the diameter of 3.08 mm;
(5) hot galvanizing aluminum alloy coating: degreasing and cleaning the surface of the drawn steel wire by using an ultrasonic cleaning tank; the steel wire is immersed into the plating assistant agent solution at the speed of 20m/min, the plating assistant temperature is 100 ℃, and the plating assistant time is 40 s. The plating assistant solution comprises the following components: ZnCl275 parts by weight of KOH 5 parts by weight of NH4Cl 5 weight portions and metal oxide 15 weight portions. The metal oxide is made of ZnO and Al2O3Made of a combination of ZnO and Al2O3The weight percentage of (A) is 1: 2. Drying the plating assistant agent remained on the surface of the steel wire at the drying temperature of 100 ℃ for 10 s; after drying, immerging the steel wire into a ceramic galvanizing pot containing zinc plating solution for dip plating to generate a galvanizing layer on the surface of the steel wire, and controlling the dip plating time to ensure that the quality of the galvanizing layer is 305g/m2；
(6) Stranding: washing 7 strands of prepared hot-dip galvanized aluminum alloy layer steel wires with absolute ethyl alcohol for 5 times, naturally airing, placing 7 strands of washed steel wires in a stranding machine, stranding to form a steel core consisting of 7 strands of steel wires, and enabling the stranding force to be 65 MPa; in the twisting process, in order to ensure good straightness of the steel core, the diameter of a traction wheel of a tube strander is 1.6 m; the steel core lay length is 154mm, and the lay direction is left.
(7) Pre-stress treatment: carrying out prestress treatment on a steel core of a galvanized aluminum alloy layer at the temperature of 190 ℃ and under the tension action of 6.5kN, wherein the speed is 30 m/min;
(8) taking up and obtaining a finished product: and cooling the steel core with the pre-stressed galvanized aluminum alloy layer to room temperature in an air cooling and water cooling mode, and taking up wires by using a take-up machine to obtain a final product.
Example 4
The prestressed steel core for the overhead conductor comprises the following components in percentage by weight: c: 0.84 wt%, Si: 0.10 wt%, P: 0.003 wt%, S: 0.002 wt%, Cu: 0.02 wt%, Mn: 0.70 wt%, Cr: 0.30 wt%, Er: 0.03 wt%, the balance being Fe and unavoidable other impurities.
The preparation method of the steel core comprises the following steps:
(1) preparing and smelting raw materials: drying the raw materials at 100 ℃ for 2.0 h; in a vacuum smelting furnace at 1100 ℃, the vacuum degree is less than or equal to 10-1Pa, adding other alloy elements after the iron is melted, completely melting the alloy elements and uniformly stirring the mixture;
(2) electroslag refining and remelting: refining at 1100 deg.C for 3.0h, and casting into electroslag ingot; carrying out electroslag remelting on the electroslag ingot, and obtaining a steel billet ingot through furnace charging, arc striking and slagging, smelting, feeding and cooling;
(3) high-temperature calcination and hot rolling: keeping the temperature of 1100 ℃ for 2.0h, forging and hot rolling the square billet into
The initial forging temperature of the wire rod is 1100 ℃, and the final forging temperature is 850 ℃; controlling the wire spinning temperature at 750 ℃; controlling the cooling speed of the wire at 5 ℃/s, cooling to 550 ℃, keeping the temperature for 30s, and then cooling to room temperature;
(4) drawing treatment: after pickling and derusting and phosphating the wire rod, carrying out multi-pass drawing processing on the wire rod by a wire drawing machine at the speed of 2.5m/s and the deformation of 15 percent, and controlling the drawing temperature at 30 ℃ to obtain a steel wire with the diameter of 3.08 mm;
(5) hot galvanizing aluminum alloy coating: degreasing and cleaning the surface of the drawn steel wire by using an ultrasonic cleaning tank; and (3) immersing the steel wire into the plating assistant agent solution at the speed of 15m/min, wherein the plating assistant temperature is 85 ℃, and the plating assistant time is 20 s. The plating assistant solution comprises the following components: ZnCl260 parts by weight of KOH 15 parts by weight of NH415 parts of Cl and 10 parts of metal oxide. The metal oxide is made of ZnO and Al2O3Made of a combination of ZnO and Al2O3The weight percentage of (A) is 1: 1. Drying the residual plating assistant agent on the surface of the steel wireThe drying temperature is 100 ℃, and the drying time is 20 s; after drying, immerging the steel wire into a ceramic galvanizing pot containing zinc plating solution for dip plating to generate a galvanizing layer on the surface of the steel wire, and controlling the dip plating time to ensure that the quality of the galvanizing layer is 305g/m2；
(6) Stranding: washing 7 strands of prepared hot-dip galvanized aluminum alloy layer steel wires with absolute ethyl alcohol for 3 times, naturally airing, placing 7 strands of washed steel wires in a stranding machine, stranding to form a steel core consisting of 7 strands of steel wires, and enabling the stranding force to be 55 MPa; in the twisting process, in order to ensure good straightness of the steel core, the diameter of a traction wheel of a tube strander is 1.6 m; the steel core lay length is 154mm, and the lay direction is left.
(7) Pre-stress treatment: carrying out prestress treatment on a steel core of a galvanized aluminum alloy layer at the temperature of 200 ℃ and under the tension action of 7.5kN, wherein the speed is 26 m/min;
(8) taking up and obtaining a finished product: and cooling the steel core with the pre-stressed galvanized aluminum alloy layer to room temperature in an air cooling and water cooling mode, and taking up wires by using a take-up machine to obtain a final product.
Example 5
The prestressed steel core for the overhead conductor comprises the following components in percentage by weight: c: 0.83 wt%, Si: 0.15 wt%, P: 0.004 wt%, S: 0.002 wt%, Cu: 0.03 wt%, Mn: 0.60 wt%, Cr: 0.35 wt%, Er: 0.02 wt%, the balance being Fe and unavoidable other impurities.
The preparation method of the steel core comprises the following steps:
(1) preparing and smelting raw materials: drying the raw materials at 120 ℃ for 1.5 h; in a vacuum smelting furnace at 1200 ℃, the vacuum degree is less than or equal to 10-1Pa, adding other alloy elements after the iron is melted, completely melting the alloy elements and uniformly stirring the mixture;
(2) electroslag refining and remelting: refining at 1150 deg.C for 2.0h, and casting into electroslag ingot; carrying out electroslag remelting on the electroslag ingot, and obtaining a steel billet ingot through furnace charging, arc striking and slagging, smelting, feeding and cooling;
(3) high-temperature calcination and hot rolling: keeping the temperature of 1150 ℃ for 1.0h, forging and hot rolling the square billet into
The initial forging temperature of the wire rod is 1120 ℃, and the final forging temperature is 950 ℃; the wire laying temperature is controlled to be 780 ℃; controlling the cooling speed of the wire at 10 ℃/s, cooling to 510 ℃, keeping the temperature for 40s, and then air-cooling to room temperature;
(4) drawing treatment: after pickling and derusting and phosphating the wire rod, carrying out multi-pass drawing processing on the wire rod by a wire drawing machine at the speed of 3.0m/s and the deformation of 12 percent, and controlling the drawing temperature at 40 ℃ to prepare a steel wire with the diameter of 3.08 mm;
(5) hot galvanizing aluminum alloy coating: degreasing and cleaning the surface of the drawn steel wire by using an ultrasonic cleaning tank; immersing the steel wire into a plating assistant solution at the speed of 12m/min, wherein the plating assistant temperature is 75 ℃, and the plating assistant time is 30s, wherein the plating assistant solution comprises the following components: ZnCl270 parts by weight of KOH 10 parts by weight of NH4Cl 10 weight portions and metal oxide 10 weight portions, wherein the metal oxide is formed by ZnO and Al2O3Made of a combination of ZnO and Al2O3The weight percentage of the plating assistant agent is 1:3, the residual plating assistant agent on the surface of the steel wire is dried, the drying temperature is 80 ℃, and the drying time is 20 s; after drying, immerging the steel wire into a ceramic galvanizing pot containing zinc plating solution for dip plating to generate a galvanizing coat on the surface of the steel wire, and controlling the dip plating time to ensure that the quality of the galvanizing coat is 306g/m2；
(6) Stranding: washing 7 strands of prepared hot-dip galvanized aluminum alloy layer steel wires with absolute ethyl alcohol for 3 times, naturally airing, placing 7 strands of washed steel wires in a stranding machine, stranding to form a steel core consisting of 7 strands of steel wires, and enabling the stranding force to be 58 MPa; in the twisting process, in order to ensure good straightness of the steel core, the diameter of a traction wheel of a tube strander is 1.6 m; the steel core lay length is 154mm, and the lay direction is left;
(7) pre-stress treatment: carrying out prestress treatment on a steel core of a galvanized aluminum alloy layer at 220 ℃ and under the tension action of 6.0kN, wherein the speed is 22 m/min;
(8) taking up and obtaining a finished product: and cooling the steel core with the pre-stressed galvanized aluminum alloy layer to room temperature in an air cooling and water cooling mode, and taking up wires by using a take-up machine to obtain a final product.
The performance test of the pre-stressed steel cores with the galvanized aluminum alloy layers prepared in the embodiments 1 to 5 is performed according to the requirements and methods of national standard GB/T3428 and 2012 galvanized steel wires for overhead stranded wires, and the test results are shown in Table 1 below.
Table 1: results of Performance testing
The prestressed steel core material for the galvanized aluminum alloy layer for the overhead conductor has excellent comprehensive performance, the tensile strength of a steel wire is larger than or equal to 2000MPa, the elongation is larger than or equal to 5.0%, the stress relaxation rate of 1000h is smaller than or equal to 2.0%, the quality of the zinc-aluminum alloy coating layer is larger than or equal to 305g/m2, the winding test is 4 times passed (the diameter of a mandrel is 4 times of the diameter D of the steel wire), and the twisting frequency is larger than or equal to 14 times. In addition, the corrosion resistance of the prestressed steel wire plated with the zinc-plated aluminum alloy coating is obviously superior to that of the prestressed steel wire plated with a pure zinc layer, a salt spray test is carried out under the same test conditions according to the requirements of national standard GB/T10125-2012 salt spray test for artificial atmosphere corrosion test, and the corrosion resistance of the steel wire plated with the zinc-plated aluminum alloy coating is improved by more than 5 times compared with that of the steel wire plated with the pure zinc layer.
The above embodiments are only intended to illustrate the technical solution of the present invention and not to limit the same, and it should be understood by those skilled in the art that the specific embodiments of the present invention can be modified or substituted with equivalents with reference to the above embodiments, and any modifications or equivalents without departing from the spirit and scope of the present invention are within the scope of the claims of the present application.
Claims (10)
1. Prestressing force steel core for air wire, its characterized in that: the paint comprises the following components in percentage by weight:
c: 0.05 to 1.00 wt%, Si: 0.05-0.20 wt%, P is less than or equal to 0.01 wt%, S is less than or equal to 0.01 wt%, Cu is less than or equal to 0.2 wt%, Mn: 0.001 to 1.00 wt%, Cr: 0.001-1.00 wt%, Er: 0.001 to 1.00 wt%, and the balance of Fe and inevitable impurities.
2. The prestressed steel core for overhead conductors of claim 1, wherein: the paint comprises the following components in percentage by weight:
c: 0.07 to 0.90 wt%, Si: 0.05-0.15 wt%, P is less than or equal to 0.005 wt%, S is less than or equal to 0.005 wt%, Cu is less than or equal to 0.1 wt%, Mn: 0.10-1.00 wt%, Cr: 0.01-1.00 wt%, Er: 0.01 to 1.0 wt%, and the balance of Fe and inevitable other impurities.
3. The prestressed steel core for overhead conductors of claim 1, wherein: the paint comprises the following components in percentage by weight:
c: 0.83 wt%, Si: 0.12 wt%, P: 0.003 wt%, S: 0.001 wt%, Cu: 0.03 wt%, Mn: 0.65 wt%, Cr: 0.25 wt%, Er: 0.05 wt%, the balance being Fe and unavoidable other impurities.
4. The method for preparing the prestressed steel core for overhead conductors of any one of claims 1 to 3, comprising the steps of:
(1) raw material preparation and smelting
Drying the raw materials at 100-150 ℃ for 1.0-2.0 h; the raw materials are dried and then smelted in a vacuum smelting furnace, other alloy elements are added after iron is melted during smelting, the alloy elements are completely melted and uniformly stirred, wherein the vacuum smelting temperature is 1100-1300 ℃, and the vacuum degree is less than or equal to 10-1Pa；
(2) Electroslag refining and remelting
Refining the melt obtained in the step (1) at 1100-1250 ℃ for 1.0-3.0 h, and casting into an electroslag ingot; then, carrying out electroslag remelting on the electroslag ingot, charging, arc striking and slagging, smelting, feeding and cooling to obtain a steel billet;
(3) high temperature calcination and hot rolling
Keeping the temperature of a steel billet at 1100-1200 ℃ for 1.0-2.0 h, then carrying out high-temperature calcination, and then carrying out hot rolling forming to obtain a wire rod, wherein the initial rolling temperature is controlled at 1100-1150 ℃, the temperature of a rolled piece entering a finishing mill is controlled at 850-950 ℃, the wire rod spinning temperature is controlled at 750-850 ℃, the wire rod cooling speed is controlled at 5-20 ℃/s, the wire rod is cooled to 500-550 ℃, and the wire rod is cooled to room temperature after being kept for 30-60 s;
(4) drawing process
Carrying out acid cleaning, derusting and phosphating on the wire rod prepared in the step (3), and then carrying out multi-pass drawing processing on the wire rod by using a wire drawing machine at the speed of 2.5-4 m/s and the deformation of 10-20%, wherein the drawing temperature is controlled at 30-50 ℃ to prepare a steel wire;
(5) hot dip zinc-aluminium alloy coating
Degreasing and cleaning the surface of the steel wire manufactured by drawing in the step (4) by using an ultrasonic cleaning tank; immersing the steel wire into the plating assistant agent solution at the speed of 10-20 m/min, wherein the plating assistant temperature is 50-100 ℃, and the plating assistant time is 20-40 s, and then drying the plating assistant agent remained on the surface of the steel wire, wherein the drying temperature is 80-100 ℃, and the drying time is 10-20 s; after being dried, the steel wire is immediately immersed into a ceramic plating pot filled with a zinc-aluminum alloy plating solution for dip plating, a galvanized aluminum alloy layer is generated on the surface of the steel wire by utilizing rapid synchronous deformation of multiple metals, and the dip plating time is controlled to ensure that the quality of the galvanized aluminum alloy layer is not less than 305g/m2；
(6) Strand twisting
Washing 7 strands of galvanized aluminum alloy layer steel wires prepared in the step (5) with absolute ethyl alcohol for 3-5 times, naturally airing, placing the 7 strands of washed steel wires in a stranding machine, stranding to form a steel core consisting of 7 strands of steel wires, and enabling the stranding force to be 55-65 MPa;
(7) prestressing treatment
Carrying out prestress treatment on the galvanized aluminum alloy layer steel core obtained in the step (6) under the tension action of 5-8 kN at the temperature of 180-220 ℃, wherein the speed is 20-30 m/min;
(8) taking up and finished product
And cooling the steel core of the zinc-plated aluminum alloy layer after the pre-stress treatment to room temperature, and then taking up the steel core by using a take-up machine to obtain the product.
5. The method for preparing the prestressed steel core for the overhead conductor according to claim 4, characterized in that: in the step (3), the diameter of the prepared wire rod is 11.0 mm.
6. The method for preparing the prestressed steel core for the overhead conductor according to claim 4, characterized in that: in the step (4), the diameter of the prepared steel wire is 3.08 mm.
7. The method for preparing the prestressed steel core for the overhead conductor according to claim 4, characterized in that: in the step (5), the plating assistant solution comprises the following components: ZnCl250 to 75 parts by weight of KOH 5 to 15 parts by weight of NH45-15 parts of Cl and 5-15 parts of metal oxide.
8. The method for preparing the prestressed steel core for the overhead conductor according to claim 7, characterized in that: the metal oxide is made of ZnO and Al2O3Made of a combination of ZnO and Al2O3The weight percentage of the component (A) is 1: 1-3: 1.
9. The method for preparing the prestressed steel core for the overhead conductor according to claim 4, characterized in that: in the step (6), the diameter of a traction wheel of a tube stranding machine adopted for stranding is 1.6 m; the steel core lay length is 154mm, and the lay direction is left.
10. The method for preparing the prestressed steel core for the overhead conductor according to claim 4, characterized in that: and (8) cooling the steel core of the galvanized aluminum alloy layer subjected to the prestress treatment in the step (7) in an air cooling and water cooling mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010454380.1A CN111793770A (en) | 2020-05-26 | 2020-05-26 | Prestressed steel core for overhead conductor and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010454380.1A CN111793770A (en) | 2020-05-26 | 2020-05-26 | Prestressed steel core for overhead conductor and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111793770A true CN111793770A (en) | 2020-10-20 |
Family
ID=72806256
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010454380.1A Pending CN111793770A (en) | 2020-05-26 | 2020-05-26 | Prestressed steel core for overhead conductor and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111793770A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113355602A (en) * | 2021-06-03 | 2021-09-07 | 全球能源互联网研究院有限公司 | Core wire material for overhead conductor and preparation method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000001751A (en) * | 1998-04-15 | 2000-01-07 | Nippon Steel Corp | High strength steel wire having disconnection resistance |
| CN101792884A (en) * | 2009-12-31 | 2010-08-04 | 首钢总公司 | Steel with underrelaxation and hydrogen corrosion resistance for high-speed railway prestressed pull rod and production method thereof |
| CN105063488A (en) * | 2015-07-30 | 2015-11-18 | 中国电力科学研究院 | Acid soil corrosion resisting steel used for grounding grid and preparing method of acid soil corrosion resisting steel |
| CN109604368A (en) * | 2018-12-11 | 2019-04-12 | 天津冶金集团中兴盛达钢业有限公司 | A kind of aerial condutor super extra-high strong zinc-coated wire and its manufacturing method |
-
2020
- 2020-05-26 CN CN202010454380.1A patent/CN111793770A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000001751A (en) * | 1998-04-15 | 2000-01-07 | Nippon Steel Corp | High strength steel wire having disconnection resistance |
| CN101792884A (en) * | 2009-12-31 | 2010-08-04 | 首钢总公司 | Steel with underrelaxation and hydrogen corrosion resistance for high-speed railway prestressed pull rod and production method thereof |
| CN105063488A (en) * | 2015-07-30 | 2015-11-18 | 中国电力科学研究院 | Acid soil corrosion resisting steel used for grounding grid and preparing method of acid soil corrosion resisting steel |
| CN109604368A (en) * | 2018-12-11 | 2019-04-12 | 天津冶金集团中兴盛达钢业有限公司 | A kind of aerial condutor super extra-high strong zinc-coated wire and its manufacturing method |
Non-Patent Citations (2)
| Title |
|---|
| 朱志强等: "《钢分析化学与物理检测》", 30 June 2013, 冶金工业出版社 * |
| 雷亚等: "《炼钢学》", 30 June 2010, 冶金工业出版社 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113355602A (en) * | 2021-06-03 | 2021-09-07 | 全球能源互联网研究院有限公司 | Core wire material for overhead conductor and preparation method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111349820B (en) | High-conductivity heat-resistant Al-Zr-Er alloy wire material and preparation method thereof | |
| CN110924202B (en) | Production method of 2160MPa high-strength galvanized steel strand for stay cable | |
| CN103352381A (en) | Production method of high-strength steel rope | |
| CN103643572B (en) | A kind of manufacture method of heat treatment prestress wire | |
| CN102747624A (en) | Low-carbon steel stranded wire and production process thereof | |
| CN102682872B (en) | Semihard aluminum wire, overhead wire and preparation method thereof | |
| CN112501506B (en) | Steel wire rod for bridge cable and manufacturing method thereof | |
| WO2021253603A1 (en) | Cu-cr-zr alloy conductor for electrified railway and manufacturing method therefor | |
| CN101261890B (en) | Manufacturing technology for high-intensity clearance ultra heat resisting aluminum alloy lead and ultra heat resisting aluminum alloy | |
| CN109554631B (en) | Low alloy steel and high-strength high-plasticity wire rod prepared from same and used for processing steel wire | |
| CN111793770A (en) | Prestressed steel core for overhead conductor and preparation method thereof | |
| CN111826584A (en) | Core wire for overhead conductor and preparation method thereof | |
| CN111575601B (en) | Ultra-low carbon steel and preparation method and application thereof | |
| CN110578074B (en) | Super heat-resistant aluminum alloy single wire and preparation method thereof | |
| CN113637875B (en) | High-conductivity corrosion-resistant aluminum alloy monofilament for overhead conductor and preparation method thereof | |
| CN111816349B (en) | Ultrahigh-conductivity aluminum-clad steel strand and production process thereof | |
| CN113174510A (en) | High-strength bending-resistant copper alloy dropper wire and preparation method thereof | |
| CN114369760A (en) | Wire rod for stress corrosion resistant ultra-high strength steel strand and manufacturing method of steel strand | |
| CN113355602A (en) | Core wire material for overhead conductor and preparation method thereof | |
| CN113684704A (en) | Production process of fatigue-resistant steel wire rope | |
| CN110964989A (en) | Overweight type rigid steel conduit for nuclear power and manufacturing method thereof | |
| CN112139276A (en) | Production process of G5A-grade hot-dip galvanized steel strand for large-span transmission line | |
| CN110706841A (en) | High-strength high-conductivity aluminum alloy wire for electrician and manufacturing method thereof | |
| CN112387804A (en) | Low-carbon steel strand drawing production process | |
| CN110157964A (en) | A kind of aluminum alloy coating power circuit power transmission and transformation component and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20201020 |
|
| RJ01 | Rejection of invention patent application after publication |