CN112391584A - Heat treatment wire rod for 2060MPa bridge cable steel wire and production method thereof - Google Patents
Heat treatment wire rod for 2060MPa bridge cable steel wire and production method thereof Download PDFInfo
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- CN112391584A CN112391584A CN202011352010.3A CN202011352010A CN112391584A CN 112391584 A CN112391584 A CN 112391584A CN 202011352010 A CN202011352010 A CN 202011352010A CN 112391584 A CN112391584 A CN 112391584A
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- 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
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- 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
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- 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
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- 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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- 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
- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
Abstract
The invention provides a heat treatment wire rod for a 2060MPa bridge cable steel wire and a production method thereof, wherein the heat treatment wire rod comprises the following components in percentage by weight: 0.87-1.00% of C, 0.65-1.30% of Si, 0.40-0.90% of Mn, 0.10-0.60% of Cr, 0.01-0.08% of V, less than or equal to 0.015% of P, less than or equal to 0.010% of S, 0.01-0.07% of Al, and the balance of Fe and inevitable impurities; the invention is produced by special design of components and through converter blowing, refining, continuous casting, casting blank grinding, high-speed wire rod rolling and heat treatment processes, and after the obtained wire rod is subjected to drawing, galvanizing (aluminum magnesium) and stabilizing treatment, the strength of the galvanized (aluminum magnesium) steel wire finished product is more than or equal to 2060MPa, and the torsion is more than or equal to 12 times. Can be used for producing 2060MPa level bridge cable galvanized (aluminum magnesium) steel wires and is suitable for bridges with extra-large span and ultrahigh strength requirements.
Description
Technical Field
The invention belongs to the technical field of metal wire manufacturing, and particularly relates to a heat treatment wire rod for a 2060 MPa-level bridge cable galvanized (aluminum-magnesium) steel wire and a production method thereof.
Background
Although the design level and the construction capacity of bridges in China are in the forefront of the world, the coil rod for bridge cable steel wires has high production technical requirements and great production difficulty, and the coil rod raw materials required in the early stage mainly depend on import. In recent years, with the progress of the coil rod production technology in China, the strength grade of the galvanized steel wire of the bridge cable is developed to 1960MPa and 2000MPa from 1670MPa and 1770MPa, and the 2000MPa grade is the highest strength grade in a bridge built into a general vehicle.
At present, the strength design level of galvanized (aluminum magnesium) steel wires of main cables of a built large-scale smart ocean bridge in a deep-medium passage is improved to 2060MPa, and the steel wire is replaced by 2000MPa after being built, so that the bridge becomes the top of the world. The wire rod is required to have high strength, high plasticity and high harness cord uniformity so as to meet the requirements of high strength and high torsion performance of the processed steel wire. However, with the further improvement of the strength, how to simultaneously ensure high plasticity and the evenness of the poker is a main problem, and the difficulty in solving is great.
Disclosure of Invention
Aiming at the technical problems, the invention provides a 2060 MPa-level bridge cable galvanized (aluminum magnesium) steel wire with finished product strength of more than or equal to 2060MPa and torsion of more than or equal to 12 times, which is suitable for bridges with extra-large span and ultrahigh strength requirements, and a production method thereof.
In order to achieve the purpose, the invention adopts the technical scheme that:
a heat treatment wire rod for a 2060MPa bridge cable steel wire comprises the following components in percentage by weight: 0.87-1.00% of C, 0.65-1.30% of Si, 0.40-0.90% of Mn, 0.10-0.60% of Cr, 0.01-0.08% of V, less than or equal to 0.015% of P, less than or equal to 0.010% of S, 0.01-0.07% of Al, and the balance of Fe and inevitable impurities.
Preferably, the specification of the wire rod is phi 13.0-phi 14.0 mm.
Preferably, the weight percentage of the components is as follows: 0.87-0.97% of C, 0.82-1.30% of Si, 0.40-0.72% of Mn, 0.30-0.60% of Cr, 0.03-0.08% of V, less than or equal to 0.015% of P, less than or equal to 0.010% of S, 0.029-0.07% of Al, and the balance of Fe and inevitable impurities.
Preferably, the weight percentage of the components is as follows: 0.92-0.97% of C, 0.82-1.10% of Si, 0.53-0.72% of Mn, 0.30-0.38% of Cr, 0.031-0.041% of V, less than or equal to 0.015% of P, less than or equal to 0.010% of S, 0.029-0.036% of Al, and the balance of Fe and inevitable impurities.
Preferably, the weight percentage of the components is as follows: 0.92% of C, 1.10% of Si, 0.72% of Mn, 0.38% of Cr, 0.031% of V, 0.010% of P, 0.001% of S, 0.036% of Al, and the balance of Fe and inevitable impurities.
A production method of a heat treatment wire rod for a 2060MPa bridge cable steel wire comprises the following steps:
(1) converting in a converter: smelting the raw materials through blast furnace molten iron → granular magnesium or KR desulfurization → 100 ton top-bottom combined blown converter steelmaking; controlling the content of P element in molten steel by adopting one-time slagging in the converter blowing process, wherein the content of P at the end point of the converter is less than or equal to 0.015 percent, and the content of S is less than or equal to 0.010 percent;
(2) refining: refining the steel after the steel is tapped by the converter through an LF (ladle furnace) -RH (relative humidity) furnace, wherein the LF furnace refining adopts a calcium aluminate slag system to cooperate with aluminum particles for deoxidation, so that the balance oxygen content in molten steel is reduced; the RH vacuum treatment time is more than or equal to 23min, the O content in the steel is controlled to be less than or equal to 13ppm, and the N content is controlled to be less than or equal to 55 ppm;
(3) continuous casting: adopting whole-process protective casting, and controlling the superheat degree of molten steel at 16-25 ℃; controlling the component segregation of the continuous casting billet by utilizing a dynamic soft reduction technology and a continuous casting soft reduction thermodynamic model and adopting crystallizer electromagnetic stirring, solidification tail end electromagnetic stirring and automatic water distribution, wherein the segregation index of the continuous casting billet is 1.06;
(4) blank grinding: performing shot blasting and flaw detection on the continuous casting billet, and polishing according to the surface condition of the continuous casting billet;
(5) rolling the high-speed wire rods: heating a continuous casting billet in a stepping furnace, a roughing mill group, a medium mill group, a pre-finishing mill group, pre-water cooling, a finishing mill group, water cooling, a reducing sizing mill group, water cooling, a spinning machine, an ultra-large fan air cooling line control cooling and coil collecting; performing controlled cooling after rolling of the coil by adopting a stelmor controlled cooling line, wherein the cooling speed of the coil before phase change of the cord body is controlled to be 11.5-12.5 ℃/s, the phase change temperature is controlled to be 620-650 ℃, the cooling speed after phase change is 1.5-2.5 ℃/s, and the coiling temperature is less than or equal to 350 ℃;
(6) and (3) heat treatment: the wire rod is sequentially subjected to mechanical shelling, wire rod heating, isothermal salt bath heat treatment and coil collection, the austenitizing heating temperature of the wire rod is controlled to be 900-980 ℃, the heat preservation time is 8-16 min, and nitrogen-based atmosphere protection is adopted; controlling the salt bath heat treatment temperature to be 520-580 ℃, and keeping the temperature for 4-7 min;
preferably, when the step furnace is used for heating in the step (5), the temperature of the preheating section is controlled to be 600-700 ℃, the preheating time is controlled to be 25-40 minutes, the temperature of the heating section is 1040-1080 ℃, the heating time is 35-50 minutes, the temperature of the soaking section is 1080-1120 ℃, the soaking time is 35-50 minutes, and the atmosphere in the furnace is controlled to be a weak reducing atmosphere.
Preferably, the initial rolling temperature in the step (5) is controlled to be 1000-1040 ℃; controlling the temperature of the wire rod entering the inlet of the finishing mill group to be 850-880 ℃, controlling the temperature of the wire rod entering the inlet of the reducing sizing mill group to be 850-880 ℃, and controlling the spinning temperature to be 860-880 ℃; the rolling speed is 20-40 m/s.
Compared with the prior art, the invention has the advantages and positive effects that: through special design of components and the production method, the obtained wire rod has moderate strength and uniform structure, and does not influence the quenching structures of used net carbides, martensite and the like. After the wire rod is subjected to drawing, galvanizing (aluminum magnesium) and stabilizing treatment, the strength of the galvanized (aluminum magnesium) steel wire finished product is more than or equal to 2060MPa, and the torsion is more than or equal to 12 times. Can be used for producing 2060MPa level bridge cable galvanized (aluminum magnesium) steel wires and is suitable for bridges with extra-large span and ultrahigh strength requirements.
Drawings
FIG. 1 is a schematic view of a metallographic structure of a sample coil in example 1 of the present invention examined by a microscope (100X);
FIG. 2 is a schematic representation of the metallographic structure of a sample coil rod examined by electron microscopy (10000X) in example 1 of the present invention.
Detailed Description
For a better understanding of the present invention, reference is made to the following detailed description taken in conjunction with the accompanying drawings and examples.
Example (b): in order to better explain the invention, the following further description is given in conjunction with specific examples.
The chemical components are basic conditions for determining the microstructure of the wire rod, and the chemical components not only relate to the processing performance of the wire rod, but also play a key role in various performance indexes of the wire rod. In order to ensure the strength of the galvanized (aluminum-magnesium) steel wire, avoid the strength from being greatly reduced after the galvanized (aluminum-magnesium) steel wire is galvanized, and improve the plasticity, a component design scheme of high silicon and adding Mn, Cr and V microalloy elements is adopted. The invention comprises the following components:
c: the invention relates to a chemical element which directly influences the strength of steel, wherein the carbon content is not less than 0.87% for ensuring the product strength, and the carbon content is not more than 1.00% for controlling the segregation of a continuous casting billet, controlling the structure and improving the plasticity of a wire rod.
Si: the steel exists in a solid solution state in steel, so that the steel has a strong strengthening effect, and meanwhile, Si can inhibit the formation of cementite and greatly reduce the strength after galvanization, so that the content of silicon is increased, and the strength of the wire rod is better ensured.
Mn, Cr, V: the hardenability and the austenite stability of the steel can be improved, the wire rod crystal grains and the sorbite lamellar structure can be refined, and the strength and the plasticity of the steel are improved.
Al: is a deoxidizer, and has stronger deoxidizing capacity than Si and Mn; the aluminum oxide is an effective element for adjusting the grain size of steel, a large amount of fine and dispersed aluminum oxide can promote the formation of fine-grained steel in the solidification process, but the coarse aluminum oxide can seriously reduce the drawing and fatigue properties of wire rods and galvanized steel wires.
P, S: the wire rod for the steel strand belongs to harmful elements and should be controlled.
Based on the above-mentioned effects of the elements, the chemical compositions of the wire rod for 2060MPa grade cable galvanized (aluminum magnesium) steel wire used in examples 1 and 2 of the present invention are shown in Table 1.
TABLE 1 chemical composition/% of the example wire rods
| Examples | C | Si | Mn | P | S | Cr | V | Al |
| 1 | 0.92 | 1.10 | 0.72 | 0.010 | 0.001 | 0.38 | 0.031 | 0.036 |
| 2 | 0.97 | 0.82 | 0.53 | 0.011 | 0.002 | 0.30 | 0.041 | 0.029 |
The wire rod production method of examples 1, 2 is as follows:
(1) converter blowing
Smelting the raw materials through blast furnace molten iron → granular magnesium or KR desulfurization → 100 ton top-bottom combined blown converter steelmaking. The blast furnace molten iron is desulfurized by a particle magnesium or KR method, the content of S is reduced to the maximum extent, and the content of S element in the molten iron entering the converter is less than or equal to 0.005 percent; in the converter blowing process, one-time slagging is adopted to control the content of P element in molten steel, the slag discharge amount of converter tapping is strictly controlled, the content of impurity elements in the molten steel is reduced, the content of P element at the converter end point is less than or equal to 0.015 percent, and the content of S element is less than or equal to 0.010 percent; the converter tapping adopts a sliding plate to block slag, the slag discharging amount is strictly controlled, and the slag discharging, the P returning and the molten steel pollution are prevented.
(2) Refining
And refining the steel tapped by the converter through a 100-ton LF furnace to a 100-ton RH furnace. In the LF furnace refining, calcium aluminate slag system is adopted to cooperate with aluminum particles for deoxidation, so that the balance oxygen content in molten steel is reduced; and (3) feeding the molten steel refined by the LF into an RH furnace for vacuum degassing to further improve the purity of the molten steel, wherein the RH vacuum treatment time is more than or equal to 23min, and the O content and the N content in the steel are controlled to be less than or equal to 13ppm and less than or equal to 55 ppm.
(3) Continuous casting
In the continuous casting step, the whole-process protective casting is adopted, secondary oxidation of molten steel is avoided, the number of inclusions in the continuous casting blank is finally reduced, the size of the inclusions is finally reduced, the total oxygen content of the steel is reduced to be below 6ppm, the sulfur content is reduced to be below 2ppm, the nitrogen content is reduced to be below 25ppm, the maximum size of the inclusions is reduced to be below 10 mu m, the number density of the inclusions is reduced to be below 6.2/mm 2, and a solid foundation is laid for improving the torsion performance and the fatigue resistance life of the steel for the bridge cable. The superheat degree of molten steel in the continuous casting process is controlled at 16-25 ℃, a dynamic soft reduction technology and a continuous casting soft reduction thermodynamic model are utilized, the component segregation of a continuous casting billet is controlled by adopting crystallizer electromagnetic stirring, solidification tail end electromagnetic stirring and automatic water distribution, and the segregation index of the continuous casting billet is 1.06.
(4) Blank grinding
The continuous casting blank is subjected to shot blasting and flaw detection, and is polished according to the surface condition of the continuous casting blank, burrs and sharp edges and corners cannot exist on the surface of the polished casting blank, and the surface quality of a finished product is guaranteed.
(5) High speed wire rod rolling
The process flow of the working procedure comprises the steps of heating a continuous casting billet stepping furnace, a roughing mill set, a medium mill set, a pre-finishing mill set, pre-water cooling, a finishing mill set, water cooling, a reducing sizing mill set, water cooling, a spinning machine, an ultra-large fan air cooling line control cooling and coil collecting. Controlling the temperature of a preheating section to be 600-700 ℃, the preheating time to be 25-40 minutes, the temperature of a heating section to be 1040-1080 ℃, the heating time to be 35-50 minutes, the temperature of a soaking section to be 1080-1120 ℃, the soaking time to be 35-50 minutes, and controlling the atmosphere in the furnace to be a weak reducing atmosphere so as to reduce surface decarburization; after the continuous casting billet is discharged from the furnace, high-pressure water dephosphorization is carried out to ensure that the iron scale is removed; controlling the initial rolling temperature to be 1000-1040 ℃; controlling the temperature of the wire rod entering the inlet of the finishing mill group to be 850-880 ℃, controlling the temperature of the wire rod entering the inlet of the reducing sizing mill group to be 850-880 ℃, and controlling the spinning temperature to be 860-880 ℃; the rolling speed is 20-40 m/s; and (3) performing controlled cooling after rolling of the coil by adopting a stelmor controlled cooling line, wherein the cooling speed of the coil before phase change of the cord body is controlled to be 11.5-12.5 ℃/s, the phase change temperature is controlled to be 620-650 ℃, the cooling speed after phase change is 1.5-2.5 ℃/s, and the coiling temperature is less than or equal to 350 ℃. The grain size and the sheet spacing of the microstructure of the wire rod are controlled by controlling the temperature and cooling in the rolling process, an ideal sorbite structure is obtained, the generation of quenching structures such as reticular carbide, martensite and the like which influence the use is avoided, and qualified wire rods are provided for the next-step heat treatment.
(6) Thermal treatment
The process flow of the working procedure comprises mechanical peeling of wire rods, heating of the wire rods, isothermal salt bath heat treatment and collection and coiling. The rolled air-cooled wire rod is repeatedly bent to remove the iron oxide scales on the surface, and the iron oxide scales on the surface of the wire rod are removed in a mechanical shelling mode to prevent the iron scales from falling into a heating furnace and a polluted salt bath; according to different specifications of the wire rod, the austenitizing heating temperature of the wire rod is controlled to be 900-980 ℃, the heat preservation time is 8-16 min, sufficient austenitizing is guaranteed, the size of austenite grains is controlled, the precise temperature control can be realized by adopting a pulse time sequence control heating mode, the temperature uniformity of the heating furnace is +/-2 ℃, and the temperature control accuracy is 1 ℃. Realize the optimized heating and save energy. Nitrogen-based controllable atmosphere protection is adopted, the carbon potential is controllable, and oxidation or decarburization and recarburization are avoided in the heating process of the wire rod after peeling; according to different specifications of the wire rod, the salt bath heat treatment temperature is controlled to be 520-580 ℃, the heat preservation time is 4-7 min, the austenite structure is completely converted into a fine and uniform sorbite structure, and the wire rod has good mechanical property and drawing processing property.
The mechanical properties of the wire rod for a 2060MPa grade galvanized (Al-Mg) wire for cables obtained in examples 1 and 2 are shown in Table 2.
The specification, tensile strength and torsion index of the steel wire obtained after the wire rod of the example 1 and the example 2 is drawn, galvanized and aluminized and stabilized are shown in the table 3.
TABLE 2 wire rod Specifications, microstructures and mechanical Properties
| Examples | Specification of | Tensile strength | Reduction of area |
| 1 | Φ13.5mm | 1539MPa | 35％ |
| 2 | Φ14.0mm | 1520MPa | 31％ |
TABLE 3 finished wire specifications and mechanical Properties
| Examples | Specification of | Tensile strength | Number of twists | |
| 1 | Φ6.0mm | 2096MPa | 21 times (twice) | |
| 2 | | 2085MPa | 19 times (twice) |
As can be seen from the experimental results and the drawings in tables 2 and 3, the wire rod obtained by the production method of the embodiment has moderate strength and uniform structure, and does not affect the quenching structures such as the used net-shaped carbide and martensite. After the wire rod is subjected to drawing, galvanizing (aluminum magnesium) and stabilizing treatment, the strength of the galvanized (aluminum magnesium) steel wire finished product is more than or equal to 2060MPa, and the torsion is more than or equal to 12 times. Can be used for producing 2060MPa level bridge cable galvanized (aluminum magnesium) steel wires and is suitable for bridges with extra-large span and ultrahigh strength requirements.
The above description is only a preferred embodiment of the present invention, and not intended to limit the present invention in other forms, and any person skilled in the art may apply the above modifications or changes to the equivalent embodiments with equivalent changes, without departing from the technical spirit of the present invention, and any simple modification, equivalent change and change made to the above embodiments according to the technical spirit of the present invention still belong to the protection scope of the technical spirit of the present invention.
Claims (8)
1. A heat treatment wire rod for a 2060MPa bridge cable steel wire is characterized by comprising the following components in percentage by weight: 0.87-1.00% of C, 0.65-1.30% of Si, 0.40-0.90% of Mn, 0.10-0.60% of Cr, 0.01-0.08% of V, less than or equal to 0.015% of P, less than or equal to 0.010% of S, 0.01-0.07% of Al, and the balance of Fe and inevitable impurities.
2. The heat-treated wire rod for the 2060 MPa-level bridge cable steel wire of claim 1, wherein: the specification of the wire rod is phi 13.0-phi 14.0 mm.
3. The heat-treated wire rod for the 2060 MPa-level bridge cable steel wire according to claim 1, wherein the heat-treated wire rod comprises the following components in percentage by weight: 0.87-0.97% of C, 0.82-1.30% of Si, 0.40-0.72% of Mn, 0.30-0.60% of Cr, 0.03-0.08% of V, less than or equal to 0.015% of P, less than or equal to 0.010% of S, 0.029-0.07% of Al, and the balance of Fe and inevitable impurities.
4. The heat-treated wire rod for the 2060 MPa-level bridge cable steel wire according to claim 1, wherein the heat-treated wire rod comprises the following components in percentage by weight: 0.92-0.97% of C, 0.82-1.10% of Si, 0.53-0.72% of Mn, 0.30-0.38% of Cr, 0.031-0.041% of V, less than or equal to 0.015% of P, less than or equal to 0.010% of S, 0.029-0.036% of Al, and the balance of Fe and inevitable impurities.
5. The heat-treated wire rod for the 2060 MPa-level bridge cable steel wire of claim 1, wherein: the weight percentage of the components is as follows: 0.92% of C, 1.10% of Si, 0.72% of Mn, 0.38% of Cr, 0.031% of V, 0.010% of P, 0.001% of S, 0.036% of Al, and the balance of Fe and inevitable impurities.
6. A production method of a heat treatment wire rod for a 2060MPa bridge cable steel wire is characterized by comprising the following steps:
(1) converting in a converter: smelting the raw materials through blast furnace molten iron → granular magnesium or KR desulfurization → 100 ton top-bottom combined blown converter steelmaking; the content of P element in molten steel is controlled by adopting one-time slagging in the converter blowing process, the content of P element at the converter blowing end point is less than or equal to 0.015 percent, and the content of S element is less than or equal to 0.010 percent;
(2) refining: refining the steel after the steel is tapped by the converter through an LF (ladle furnace) -RH (relative humidity) furnace, wherein the LF furnace refining adopts a calcium aluminate slag system to cooperate with aluminum particles for deoxidation, so that the balance oxygen content in molten steel is reduced; the RH vacuum treatment time is more than or equal to 23min, the O content in the steel is controlled to be less than or equal to 13ppm, and the N content is controlled to be less than or equal to 55 ppm;
(3) continuous casting: adopting whole-process protective casting, and controlling the superheat degree of molten steel at 16-25 ℃; controlling the component segregation of the continuous casting billet by utilizing a dynamic soft reduction technology and a continuous casting soft reduction thermodynamic model and adopting crystallizer electromagnetic stirring, solidification tail end electromagnetic stirring and automatic water distribution, wherein the segregation index of the continuous casting billet is 1.06;
(4) blank grinding: performing shot blasting and flaw detection on the continuous casting billet, and polishing according to the surface condition of the continuous casting billet;
(5) rolling the high-speed wire rods: heating a continuous casting billet in a stepping furnace, a roughing mill group, a medium mill group, a pre-finishing mill group, pre-water cooling, a finishing mill group, water cooling, a reducing sizing mill group, water cooling, a spinning machine, an ultra-large fan air cooling line control cooling and coil collecting; performing controlled cooling after rolling of the coil by adopting a stelmor controlled cooling line, wherein the cooling speed of the coil before phase change of the cord body is controlled to be 11.5-12.5 ℃/s, the phase change temperature is controlled to be 620-650 ℃, the cooling speed after phase change is 1.5-2.5 ℃/s, and the coiling temperature is less than or equal to 350 ℃;
(6) and (3) heat treatment: the wire rod is sequentially subjected to mechanical shelling, wire rod heating, isothermal salt bath heat treatment and coil collection, the austenitizing heating temperature of the wire rod is controlled to be 900-980 ℃, the heat preservation time is 8-16 min, and nitrogen-based atmosphere protection is adopted; controlling the salt bath heat treatment temperature to be 520-580 ℃, and keeping the temperature for 4-7 min.
7. The heat-treated wire rod for the 2060 MPa-level bridge cable steel wire and the production method of the wire rod according to claim 6, wherein the heat-treated wire rod comprises: and (5) when the step furnace is used for heating, controlling the temperature of the preheating section to be 600-700 ℃, the preheating time to be 25-40 minutes, the temperature of the heating section to be 1040-1080 ℃, the heating time to be 35-50 minutes, the temperature of the soaking section to be 1080-1120 ℃, the soaking time to be 35-50 minutes, and controlling the atmosphere in the furnace to be a weak reducing atmosphere.
8. The heat-treated wire rod for the 2060 MPa-level bridge cable steel wire and the production method of the wire rod according to claim 6, wherein the heat-treated wire rod comprises: controlling the initial rolling temperature to be 1000-1040 ℃; controlling the temperature of the wire rod entering the inlet of the finishing mill group to be 850-880 ℃, controlling the temperature of the wire rod entering the inlet of the reducing sizing mill group to be 850-880 ℃, and controlling the spinning temperature to be 860-880 ℃; the rolling speed is 20-40 m/s.
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| CN113652610A (en) * | 2021-08-17 | 2021-11-16 | 江苏联峰实业有限公司 | Ultrahigh-strength stranded wire rod for railway bridge and production process |
| CN114561598A (en) * | 2022-03-30 | 2022-05-31 | 江苏省沙钢钢铁研究院有限公司 | 2200 MPa-grade wire rod for steel wire and manufacturing method thereof |
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| CN116590624A (en) * | 2023-07-17 | 2023-08-15 | 江苏永钢集团有限公司 | Bridge cable hot dip galvanized steel wire, wire rod for steel wire and production method thereof |
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| CN113088798A (en) * | 2021-03-31 | 2021-07-09 | 江苏省沙钢钢铁研究院有限公司 | High-carbon steel wire rod and production method thereof |
| CN113186388A (en) * | 2021-04-15 | 2021-07-30 | 鞍钢股份有限公司 | Controlled cooling method for ultrahigh-strength heat-treatment-free prestressed steel strand wire rod |
| CN113403521A (en) * | 2021-05-07 | 2021-09-17 | 青岛特殊钢铁有限公司 | Production method of wire rod for 2100 MPa-level alloy anticorrosive coating steel wire |
| CN113584385A (en) * | 2021-07-26 | 2021-11-02 | 青岛特殊钢铁有限公司 | Controlled cooling method for martensite/bainite-based high-strength annealing-free welding wire rod |
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| CN116590624A (en) * | 2023-07-17 | 2023-08-15 | 江苏永钢集团有限公司 | Bridge cable hot dip galvanized steel wire, wire rod for steel wire and production method thereof |
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Application publication date: 20210223 |