CN112501506B - Steel wire rod for bridge cable and manufacturing method thereof - Google Patents
Steel wire rod for bridge cable and manufacturing method thereof Download PDFInfo
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- C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
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- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
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- C—CHEMISTRY; METALLURGY
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
Abstract
The invention discloses a steel wire rod for a bridge cable and a manufacturing method thereof, wherein the manufacturing method comprises the following production steps: smelting, continuous casting and rolling; the steel wire rod for the bridge cable comprises the following chemical components in percentage by weight: 0.85-0.91%, Si: 0.20 to 0.50%, Mn: 0.60-0.90%, Cr is less than or equal to 0.20%, P is less than or equal to 0.015%, S is less than or equal to 0.015%, Ni is less than or equal to 0.20%, Cu is less than or equal to 0.10%, Al is less than or equal to 0.05%, V is less than or equal to 0.1%, O is less than or equal to 0.003%, N is less than or equal to 0.006%, and the balance is Fe and inevitable impurities; according to the invention, by scientifically and reasonably matching Cr, V, Al and Si in the components of the steel wire rod for the bridge cable and adopting a reasonable manufacturing method, the processes are reduced, the cost is saved, and the mechanical property requirement of the wire rod is ensured, so that the manufacturing and the service performance of the subsequent galvanized steel wire are ensured.
Description
Technical Field
The invention relates to the field of metal materials and manufacturing thereof, in particular to a steel wire rod for a bridge cable and a manufacturing method of the steel wire rod for the bridge cable.
Background
In recent years, the construction of large bridges is vigorously developed, key technologies such as large-span bridge design, civil engineering construction technology, steel wires for steel box girders and bridge cables and the like are increasingly mature, and suspension bridges and cable-stayed bridges break through kilometer-scale spans; the development of the steel wire for the high-strength bridge cable is more prominent.
The hot-dip galvanized steel wire for the bridge cable is generally a steel wire which is made by taking a high-carbon hot-rolled sorbite structure wire rod as a raw material and carrying out surface treatment, cold drawing, hot dip galvanizing, stabilizing treatment and other processes. The requirement for improving the bridge spanning capability in bridge design and construction promotes the continuous improvement of the strength grade of the hot-dip galvanized steel wire, the strength grade is gradually developed from less than 1000MPa to 1960MPa, and the strength grade of a wire rod corresponding to the prepared hot-dip galvanized steel wire is also gradually improved to 1350 MPa. However, the steel wire rod for the bridge cable steel wire produced by the conventional method cannot meet the strength requirement for manufacturing a phi 7mm specification of 1860MPa grade galvanized steel wire. Because the galvanized steel wire with the specification strength has only two production ways at present: 1. producing a steel wire rod for a bridge cable by adopting a two-fire cogging process; 2. the hot-rolled steel wire rod is treated by adopting a lead bath/salt bath mode. The two methods have long construction period and high cost, and are not favorable for energy conservation and environmental protection. For example, the process flow of the galvanized steel wire rod of the grade 1860MPa of Bao steel is as follows: converter, refining, VOD, continuous casting, heating, cogging, heating, rolling and quenching by using a wire rod external lead bath; the method adopts the bloom cogging and off-line lead bath quenching process, and has long production flow and higher cost. The Qingdao steel process flow comprises the following steps: the method adopts the processes of rectangular billet and offline salt bath, and is also long in production flow and high in production cost. The two steel wire rod technologies for producing the cable steel wire adopt bloom rolling and subsequent lead bath or salt bath treatment, the cost is increased by 500 yuan/ton and 600 yuan/ton, and the cost is higher. At present, a production method of galvanized steel wire rods, which uses billets to be formed by one-fire process without two-fire cogging and a lead bath/salt bath process, does not appear in the market.
Disclosure of Invention
The invention provides a steel wire rod for a bridge cable and a manufacturing method of the steel wire rod for the bridge cable, which aims to solve the problems of longer process flow and higher cost in the production of the steel wire rod for the bridge cable, and is a billet which is made by one-shot firing and is free of subsequent off-line heat treatment.
The steel wire rod for the bridge cable is characterized by comprising the following components in percentage by weight: 0.85-0.91%, Si: 0.20 to 0.50%, Mn: 0.60-0.90%, Cr is less than or equal to 0.20%, P is less than or equal to 0.015%, S is less than or equal to 0.015%, Ni is less than or equal to 0.20%, Cu is less than or equal to 0.10%, Al is less than or equal to 0.05%, V is less than or equal to 0.1%, O is less than or equal to 0.003%, N is less than or equal to 0.006%, and the balance is iron and unavoidable impurities.
According to the invention, the Cr, V, Al and Si elements in the composition of the steel wire rod for the bridge cable are scientifically and reasonably matched, so that the mechanical property of the steel wire rod for the bridge cable free of heat treatment is ensured, the heat treatment process is reduced, and the production cost is saved. Wherein, Cr element can ensure the strength of the steel wire and can also inhibit decarburization at a certain degree of lamination; the V element exists in the form of carbonitride in the steel or improves the strength of the wire rod; al element can refine grains, but influences the pouring performance of molten steel; the Si element can reduce the strength loss in the hot galvanizing process. Therefore, the invention not only can ensure the strength of the galvanized steel wire, but also can ensure the plasticity index of the wire rod and the pourability of the molten steel by reasonably proportioning the Cr, V, Al and Si elements, and ensures that the wire rod can also meet the mechanical property requirement of the prepared galvanized steel wire without subsequent heat treatment.
The tensile strength of the steel wire rod for the bridge cable is 1280-1320 MPa. The torsion test of the steel wire with phi 7mm specification and 1860MPa grade manufactured by the wire rod is more than or equal to 20 times, the winding test is more than or equal to 8 times, the sorbite content is more than or equal to 90 percent, and the net-shaped carbide is uniformly distributed.
The invention discloses a manufacturing method of a steel wire rod for a bridge cable, which is characterized by comprising the following production steps of: converter smelting, LF refining, VD vacuum treatment, continuous casting and rolling; wherein: the VD vacuum treatment comprises tundish superheat degree control; the continuous casting comprises electromagnetic stirring control; the rolling comprises the processes of billet heating, hot rolling and strong wind rapid cooling.
The invention utilizes low superheat degree pouring and tail end electromagnetic stirring, can well control carbon segregation, furthest improve central equiaxial crystals and inhibit the growth of columnar crystals. The superheat degree of the tundish after VD vacuum treatment is controlled at 20-30 ℃. The electromagnetic stirring current of the crystallizer is 400A, and the frequency is 3.5 HZ; the terminal electromagnetic stirring current 500A, frequency 10 HZ.
In the rolling process, the heating parameters of the steel billet are as follows: the first-stage heating is 800-; the total heating time is 90-150 min; the parameters of the hot rolling are as follows: the initial rolling temperature is 1000-; the roller speed is 1.2m/s, and the finished product speed is 20-40 m/s. The continuous casting billet of the invention is a small square billet with the specification of 150mm multiplied by 150 mm. Compared with the production of a large square billet, the production of the cable steel wire rod by adopting the small square billet is beneficial to reducing the casting blank segregation, controlling the quantity of the reticular carbide, reducing the one-time cogging process, reducing the production procedures and saving the production cost.
The invention adopts reasonable billet heating temperature, rolling temperature and rolling speed, and cooling after rolling to control and improve the sorbite structure content of the cable steel wire rod. The invention is provided with 1-15 fans on the wire rod air cooling line, and the air quantity of each fan is 16-26 ten thousand meters3H is used as the reference value. The invention controls the speed of the wire rod roller way to be 1.2m/s and the speed of the finished product to be 20-40 m/s. The forced cooling speed of the wire rod is increased by a large fan and large air quantity after rolling, the finished product speed of the wire rod is reduced, the stacking density of the wire rod on an air cooling line is reduced, the cooling strength of the wire rod is increased, and the wire rod is enabled to quickly form a sorbite structure.
According to the invention, by scientifically and reasonably matching Cr, V, Al and Si in the components of the steel wire rod for the bridge cable and adopting the reasonable manufacturing method, not only can the strength of the galvanized steel wire be ensured, but also the plasticity index and molten steel pourability of the wire rod can be ensured, and the wire rod can also meet the mechanical property requirement without subsequent heat treatment. The segregation can be controlled to be below 1.10 by adopting low superheat degree pouring and tail end electromagnetic stirring. The small square billet with the specification of 150mm multiplied by 150mm is heated into a material at one time, cogging and rolling are not needed, and the production cost is reduced. Reasonable billet heating temperature, rolling speed and post-rolling cooling speed are adopted, so that the sorbite structure content of the cable steel wire rod is improved, and the manufacturing and service performance of subsequent galvanized steel wires are ensured.
Drawings
FIG. 1 is a prior art 1860MPa grade hot rolled wire rod sorbite structure diagram;
FIG. 2 is a sorbite structure diagram of a 1860MPa grade hot-rolled wire rod according to example 1 of the present invention;
FIG. 3 is a sorbite structure diagram of a 1860MPa grade hot rolled wire rod according to example 2 of the present invention;
FIG. 4 is a Soxhlet structure chart of 1860 MPa-grade hot-rolled wire rod according to example 3 of the present invention.
Detailed Description
The following are exemplary embodiments and detailed descriptions of specific embodiments of the present invention. The present invention may be variously modified and may include various embodiments. Other features and advantages of the present invention will be described in the following detailed description of the invention which refers to the accompanying drawings.
Referring to the metallographic structure diagram of the hot rolled wire rod in the attached drawings 1-4, the steel wire rod for the bridge cable comprises the following components in percentage by weight: 0.85-0.91%, Si: 0.20 to 0.50%, Mn: 0.60-0.90%, Cr is less than or equal to 0.20%, P is less than or equal to 0.015%, S is less than or equal to 0.015%, Ni is less than or equal to 0.20%, Cu is less than or equal to 0.10%, Al is less than or equal to 0.05%, V is less than or equal to 0.1%, O is less than or equal to 0.003%, N is less than or equal to 0.006%, and the balance is iron and unavoidable impurities. The invention ensures the strength of the galvanized steel wire and meets the plasticity index of the wire rod through reasonable component control.
The manufacturing method controls the segregation of the steel billet through low-superheat pouring and end electromagnetic stirring. The method adopts a 150mm multiplied by 150mm small square billet to be heated and formed into a material at one time so as to reduce the segregation of a casting blank and control the quantity of reticular carbides. Reasonable billet heating temperature, rolling temperature and rolling speed and cooling control after rolling are adopted to improve the sorbite structure content of the cable steel wire rod.
The invention adopts reasonable components, continuous casting process and rolling process, so that the tensile strength of the steel wire rod for the bridge cable obtained after rolling reaches 1280-1320 MPa. The wire rod produced by the invention can completely meet the technical requirements of manufacturing the phi 7mm and 1860Mpa strength level bridge cable wire, the phi 7mm 1860Mpa level steel wire manufactured by the wire rod produced by the invention has the torsion test more than or equal to 20 times, the winding test more than or equal to 8 times, the sorbite content more than or equal to 90 percent, and the reticular carbide is uniformly distributed. The steel wire rod for bridge cables manufactured by the method has the sorbite structure content of more than 90 percent and has good comprehensive mechanical property.
The invention adopts the small square billet to produce the finished product by one-time heating, does not need cogging and rolling, and reduces the production cost. In order to avoid the problem of insufficient strength of the wire rod produced by using the small square billet, the invention adopts the following method to solve the problems: 1. by adopting a Cr, V and Al microalloying technology, the wire rod has good strong plasticity; 2. the strong plasticity of the wire rod is improved by adopting the processes of electromagnetic stirring, low-temperature pouring and strong cooling.
Example 1
The steel wire rod for the bridge cable in the embodiment 1 comprises the following components in percentage by weight: 0.85%, Si: 0.35%, Mn: 0.70%, Cr: 0.10%, P0.010%, S0.010%, Ni 0.10%, Cu 0.05%, Al: 0.04%, V:0.05 percent, 0.002 percent of O, 0.004 percent of N, and the balance of iron and inevitable impurities.
The Cr, V, Al and Si elements in the components are reasonably proportioned, so that the mechanical property of the steel wire rod for the thermal treatment-free cable is ensured, the thermal treatment process is reduced, and the production cost is saved. Wherein 0.10 percent of the element Cr0.10 percent can ensure the strength of the steel wire through tests and can inhibit decarburization to a certain extent. Sorbite tissue control is difficult as e.g. high or low will lower the plasticity index of the wire rod. The element V0.05% was chosen as it was confirmed during the tests that the presence of V in steel in the form of carbonitrides was effective in increasing the strength of the wire rod. However, if the amount is large, the number of carbonitride particles increases, and the plasticity deteriorates. The casting performance of the molten steel cannot be influenced by adopting the proportion of Al0.04%, and the Al element can also refine grains. Si element can reduce the strength loss in the hot galvanizing process, but too high Si can cause severe graphitization and poor plasticity of the galvanized steel wire, and reasonable Si0.35% is selected through experiments in the embodiment.
In the embodiment, the Cr, V, Al and Si elements are scientifically and reasonably matched, so that the plasticity index and the molten steel pourability of the wire rod can be ensured, and the wire rod can also meet the mechanical property requirement of the wire rod without subsequent heat treatment. And the prepared galvanized steel wire can meet the technical requirements of the bridge cable steel wire with the specification of phi 7mm and the strength level of 1860 MPa.
In the production process of manufacturing the wire rod, after the vacuum VD treatment, the superheat degree of the tundish is controlled at 30 ℃, the electromagnetic stirring current of the crystallizer is 400A, and the frequency is 3.5 HZ. The terminal electromagnetic stirring current 500A, frequency 10 HZ. The specification of the billet produced by continuous casting is 150mm multiplied by 150 mm.
In the embodiment, low superheat degree pouring and tail end electromagnetic stirring are utilized, so that carbon segregation can be well controlled, central equiaxed crystals are improved to the maximum extent, and the growth of columnar crystals is inhibited. Compared with the production of a large square billet, the production of the cable steel wire rod by using the small square billet is beneficial to reducing the casting blank segregation and controlling the quantity of reticular carbide in the wire rod tissue. Meanwhile, the production process reduces one-time cogging process and heat treatment process, and saves production cost.
In the rolling process, the heating parameters of the steel billet are as follows: heating the first section to 800 ℃, heating the second section to 1100 ℃, and soaking the second section to 1100 ℃; the total heating time is 90 min; the hot rolling parameters are as follows: the initial rolling temperature is 1000 ℃, the initial rolling temperature is 870 ℃ in a finishing mill, the initial rolling temperature is 900 ℃, and the initial rolling temperature is 900 ℃ for reducing; the roller speed is 1.2m/s, and the finished product speed is 40 m/s.
In the embodiment, 2 fans are arranged on the wire rod air cooling line, and the air quantity of each fan is 16 ten thousand meters3H is used as the reference value. The wire rod is rapidly cooled by strong wind, so that the sorbite tissue content in the wire rod is increased. In the embodiment, reasonable heating temperature, rolling temperature and speed of the steel billet and cooling control after rolling are adopted to improve the sorbite structure content of the cable steel wire rod. The cooling speed of the wire rod is improved by a large fan and large air quantity after rolling. And the stacking density of the wire rod on the air cooling line is reduced, the cooling strength is increased, and the sorbite tissue content of the wire rod is improved.
In the embodiment, by reasonably matching the Cr, V, Al and Si component ratios, the strength of the galvanized steel wire can be ensured, the plasticity index and the molten steel pourability of the wire rod can be ensured, and the wire rod can also meet the mechanical property requirement without subsequent heat treatment. Segregation can be controlled by adopting low superheat degree pouring and end electromagnetic stirring. The small square billet with the specification of 150mm multiplied by 150mm is heated into a material at one time, cogging and rolling are not needed, and the production cost is reduced. Reasonable billet heating temperature, rolling temperature and rolling speed and cooling control after rolling are adopted to improve the sorbite structure content of the cable steel wire rod to 92 percent.
The tensile strength of the steel wire rod for the bridge cable produced by the embodiment is 1280MPa, the steel wire rod with phi 7mm specification and 1860MPa grade manufactured by the wire rod is subjected to torsion test for 22 times and winding test for 10 times, and the net-shaped carbide is uniformly distributed. As shown in the coil sorbite structure diagram of fig. 2, compared with the structure diagram of fig. 1, the sorbite content of fig. 2 is improved by 2 percent, and sorbites are more uniform. The steel wire prepared by the steel wire rod for the bridge cable manufactured by the embodiment has the performance equivalent to that of a common phi 7mm specification and 1860Mpa grade galvanized steel wire in the current market, but obviously reduces the production procedures and greatly saves the production cost.
Example 2
The preparation steps are as in example 1, and the chemical components of the steel wire rod for the bridge cable of example 2 are as follows by weight percent: 0.88%, Si: 0.25%, Mn: 0.80%, Cr: 0.20%, P: 0.005%, S: 0.005%, Ni: 0.20%, Cu: 0.02%, Al: 0.030%, V: 0.03%, O: 0.001%, N: 0.002%, and the balance of iron and unavoidable impurities.
Controlling the superheat degree of the tundish after VD vacuum treatment: 20 ℃; the electromagnetic stirring current of the crystallizer is 400A, and the frequency is 3.5 HZ; the electromagnetic stirring current at the tail end is 500A, and the frequency is 10 HZ; the continuous casting billet specification is 150mm multiplied by 150 mm.
In the rolling process, the heating parameters of the steel billet are as follows: heating the first section to 830 ℃, heating the second section to 1050 ℃, and soaking the second section to 1120 ℃; the total heating time is 120 min; the hot rolling parameters are as follows: the initial rolling temperature is 1030 ℃, the initial rolling temperature is 900 ℃ in a finishing mill, the initial rolling temperature is 900 ℃, the final rolling temperature is 900 ℃, and the spinning temperature is 900 ℃; the roller speed is 1.2m/s, and the finished product speed is 30 m/s; the air cooling parameters are as follows: 15 fans, the air quantity of each fan is 26 ten thousand meters3/h。
The tensile strength of the steel wire rod for the bridge cable produced by the embodiment is 1300MPa, the steel wire rod with phi 7mm specification and 1860MPa grade manufactured by the wire rod is subjected to 25 times of torsion tests and 12 times of winding tests, and the net-shaped carbide is uniformly distributed. Comparing the structure chart of fig. 3 with that of fig. 1, the sorbite content of fig. 3 is improved by 3% and is equivalent to the performance of a conventional 1860Mpa grade steel wire with phi 7mm specification on the market.
Example 3
The preparation steps are as in example 1, and the chemical components of the steel wire rod for the bridge cable in example 3 are as follows by weight percent: 90%, Si: 0.50%, Mn: 0.90%, Cr: 0.10%, P0.010%, S0.007%, Ni 0.15%, Cu 0.05%, Al: 0.03 percent, 0.05 percent of V, 0.002 percent of O, 0.004 percent of N, and the balance of iron and inevitable impurities.
Controlling the superheat degree of the tundish to be 25 ℃ after VD vacuum treatment; the electromagnetic stirring current of the crystallizer is 400A, and the frequency is 3.5 HZ; the electromagnetic stirring current at the tail end is 500A, and the frequency is 10 HZ; the continuous casting billet specification is 150mm multiplied by 150 mm.
In the rolling process, the heating parameters of the steel billet are as follows: heating for the first stage at 860 deg.C, heating for the second stage at 1125 deg.C, and soaking for 1160 deg.C; the total heating time is 150 min; the hot rolling parameters are as follows: the initial rolling temperature is 1050 ℃, the initial rolling temperature is 930 ℃, the final rolling temperature is 930 ℃, and the spinning temperature is 930 ℃; the roller speed is 1.2m/s, and the finished product speed is 20 m/s; the air cooling parameters are as follows: 10 fans, and the air quantity of each fan is 20 ten thousand meters3/h。
The tensile strength of the steel wire rod for the bridge cable produced in the embodiment is 1320MPa, the steel wire rod with phi 7mm specification and 1860MPa grade manufactured by the wire rod is subjected to torsion test for 22 times and winding test for 10 times, and the net-shaped carbide is uniformly distributed. Comparing the microstructure diagram of fig. 4 with the microstructure diagram of fig. 1, the microstructure diagram of fig. 4 shows that the sorbite content of fig. 4 is improved by 4 percent, which is equivalent to the performance of the conventional 1860Mpa grade steel wire with the specification of phi 7mm of second fire on the market.
The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications may be made by those skilled in the art without departing from the principles of the invention and are intended to be within the scope of the invention.
Claims (5)
1. The manufacturing method of the steel wire rod for the bridge cable is characterized by comprising the following production steps: converter smelting, LF refining, VD vacuum treatment, continuous casting and rolling; wherein: the VD vacuum treatment comprises tundish superheat degree control; the continuous casting comprises electromagnetic stirring control; the rolling comprises the processes of billet heating, hot rolling and strong wind rapid cooling;
the control range of the superheat degree of the tundish after VD vacuum treatment is as follows: 20-30 ℃;
the continuous casting electromagnetic stirring parameters are as follows: the electromagnetic stirring current of the crystallizer is 400A, and the frequency is 3.5 Hz; the electromagnetic stirring current at the tail end is 500A, and the frequency is 10 Hz;
in the rolling process, the heating parameters of the steel billet are as follows: the first-stage heating is 800-; the total heating time is 90-150 min;
the wire rod comprises the following components in percentage by weight: 0.85-0.91%, Si: 0.20 to 0.50%, Mn: 0.60-0.90%, Cr is less than or equal to 0.10%, P is less than or equal to 0.015%, S is less than or equal to 0.015%, Ni is less than or equal to 0.20%, Cu is less than or equal to 0.10%, Al: 0.03-0.05%, V is less than or equal to 0.1%, O is less than or equal to 0.003%, N is less than or equal to 0.006%, and the balance is iron and unavoidable impurities;
the strong wind rapid cooling means that 1-15 fans are arranged on the wire rod air cooling line, and the air volume of each fan is 16-26 ten thousand meters3/h。
2. The method for manufacturing the steel wire rod for the bridge cable according to claim 1, wherein the hot rolling parameters are as follows: the initial rolling temperature is 1000-; the roller speed is 1.2m/s, and the finished product speed is 20-40 m/s.
3. The method for manufacturing a steel wire rod for a bridge cable according to claim 1, wherein the continuous casting is a billet of 150mm x 150 mm.
4. The method for manufacturing the steel wire rod for the bridge cable according to claim 1, wherein the tensile strength of the wire rod is 1280-1320 MPa.
5. The manufacturing method of the steel wire rod for the bridge cable according to claim 4, wherein the wire rod meets the technical requirements of manufacturing the bridge cable steel wire with the specification of phi 7mm and the strength level of 1860 MPa; wherein, the steel wire torsion test is more than or equal to 20 times, the winding test is more than or equal to 8 times, the sorbite content is more than or equal to 90 percent, and the reticular carbide is uniformly distributed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN113337778A (en) * | 2021-05-13 | 2021-09-03 | 东南大学 | Oil well load-bearing detection cable armored steel wire and production method thereof |
| CN113462982B (en) * | 2021-07-06 | 2022-12-27 | 江苏永钢集团有限公司 | Wire rod for stranded wire and production process |
| 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 |
| 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 |
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| CN101565797A (en) * | 2008-04-22 | 2009-10-28 | 宝山钢铁股份有限公司 | High-strength galvanized steel wire and application thereof in bridge cable manufacture |
| CN109023075A (en) * | 2018-09-05 | 2018-12-18 | 鞍钢股份有限公司 | A kind of production method of 1860MPa grades of high strength steel cord wire rod |
| CN111321352A (en) * | 2020-03-25 | 2020-06-23 | 中国铁道科学研究院集团有限公司 | Strength 2400 MPa-grade prestressed steel strand and production process thereof |
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| CN101649416B (en) * | 2009-09-04 | 2011-05-25 | 江苏省沙钢钢铁研究院有限公司 | High carbon steel wire rod and preparation method thereof |
| CN102634730B (en) * | 2012-04-28 | 2014-10-29 | 宝山钢铁股份有限公司 | Steel wire rod for 1860MPa-level bridge cable galvanized steel wire and manufacturing method thereof |
| CN103805861B (en) * | 2014-02-11 | 2016-06-01 | 江苏省沙钢钢铁研究院有限公司 | A kind of carbon steel wire rod with high and its preparation method |
| CN105671443B (en) * | 2016-02-25 | 2018-02-09 | 邢台钢铁有限责任公司 | 1960MPa levels cable zinc-coated wire gren rod and production method |
| CN106591700B (en) * | 2016-12-05 | 2018-07-17 | 邢台钢铁有限责任公司 | High intensity cutting steel wire gren rod and its production method |
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| CN101565797A (en) * | 2008-04-22 | 2009-10-28 | 宝山钢铁股份有限公司 | High-strength galvanized steel wire and application thereof in bridge cable manufacture |
| CN109023075A (en) * | 2018-09-05 | 2018-12-18 | 鞍钢股份有限公司 | A kind of production method of 1860MPa grades of high strength steel cord wire rod |
| CN111321352A (en) * | 2020-03-25 | 2020-06-23 | 中国铁道科学研究院集团有限公司 | Strength 2400 MPa-grade prestressed steel strand and production process thereof |
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Denomination of invention: A steel wire rod for bridge cable and its manufacturing method Effective date of registration: 20220713 Granted publication date: 20220301 Pledgee: China Construction Bank Zhangjiagang branch Pledgor: JIANGSU YONGGANG GROUP Co.,Ltd. Registration number: Y2022980010345 |
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Date of cancellation: 20230801 Granted publication date: 20220301 Pledgee: China Construction Bank Zhangjiagang branch Pledgor: JIANGSU YONGGANG GROUP Co.,Ltd. Registration number: Y2022980010345 |