CN103014508A - Steel wire for aerial cable steel core with spanning degree not smaller than 3500m and production method thereof - Google Patents
Steel wire for aerial cable steel core with spanning degree not smaller than 3500m and production method thereof Download PDFInfo
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Abstract
The invention discloses a steel wire for an aerial cable steel core with a spanning degree not smaller than 3500m and a production method thereof. The steel wire comprises the following components in percentage by weight in terms of content: 0.79-0.84% of C, 0.70-0.90% of Mn, 0.15-0.30% of Si, not more than 0.01% of P, not more than 0.01% of S, 0.28-0.35% of Cr, and 0.015-0.035% of V. The production method comprises the steps of: selecting a wire rod with the diameter being 9-11mm and the tensile strength not lower than 1180MPa; carrying out acid washing and phosphating treatment on the wire rod; drawing the wire rod; and galvanizing the drawn wire rod to obtain a steel wire for later use. According to the galvanized steel wire with phi being 2.70-4.60mm, produced according to the invention, the wire rod is directly drawn without undergoing lead hardening treatment, so that the pollution to the environment is reduced, thermal treatment procedures such as the lead hardening and the like as well as corresponding equipment maintenance works are reduced; and in addition, under the condition of simple components, the steel wire is at least 1900MPa in tensile strength, at least 1600MPa in 1% elongation stress and at least 20 in torsion number.
Description
Technical field
The present invention relates to wire rod and production method thereof, belong to particularly a kind of span 〉=3500 meter overhead line carrying steel core steel wire and production method thereof, it is applicable to produce the superstrength rank overhead line carrying steel core steel wire that diameter is φ 2.7-4.0mm.
Background technology
The specific performance index of superstrength rank galvanized steel wire is: tensile strength 〉=1770MPa, and 1% elongation stress 〉=1550MPa, unit elongation 〉=2.5 %, number of torsions 〉=14, zinc coat mass meets the A level of GB/T3428-2002.Superstrength rank galvanized steel wire can be made the superstrength rank Stranded Galvanized Steel Wire of 1 * 7,1 * 19 and 1 * 37 structure.
Along with the extra-high voltage that possesses the energy-saving and environmental protection characteristics, the large span power transmission technology is increasingly mature and apply, more and more higher with the requirement of Stranded Galvanized Steel Wire to the carrying of overhead power transmission cable, GB GB/T3428-2002(is equal to IEC 60888) in the galvanized steel wire strength grade that comprises be difficult to satisfy the requirement of making overlength, large section Aluminium Cable Steel Reinforced, be badly in need of developing other Stranded Galvanized Steel Wire of superstrength level.
Superstrength rank Stranded Galvanized Steel Wire will possess " three height " characteristics simultaneously, that is: stress and height reversed when high-tensile, high 1% extended, and the difficult point of manufacturing is how to guarantee 3 requirements that performance index all can meet the specification simultaneously of product.
In general, the method that improves the drawn steel wire Strenth and stress has 3 kinds, and the one, increase the total deformation of steel wire, but too high cold deformation can damage to the toughness of steel wire, cause twisting property defective; The 2nd, select initial strength to surpass the raw material of 1250MPa, but present domestic high-carbon steel wire rod that can stably manufactured is mainly 82B series, its initial strength generally all is lower than 1200MPa, is difficult to satisfy the demand of production superstrength rank Stranded Galvanized Steel Wire product; The 3rd, to 82B wire rod raw material carry out lead bath quenching process after again drawing, organize percentage composition with the sorbite that improves wire rod, reach the purpose that improves wire rod initial strength and toughness, but this production method is owing to increased the lead bath quenching operation, product per ton will increase more than 800 yuan of process cost, also can cause certain pollution to environment simultaneously.
About adopting the research of wire rod production superstrength galvanized steel wire aspect, can both find corresponding document and patent both at home and abroad, these documents and patent can be divided into two classes:
One, Application Areas is different from this patent, is mainly the bridge cable galvanized steel wire, in the technical indicator tensile strength is had relatively high expectations, and to 1% when elongation stress, reverse etc. toughness index do not explicitly call for or require lower, as:
T Tarui " High Strength Galvanized Wire for Bridge Cables " (Materials Science Forum.2003,426/432 (2): 829-834), " Wire rod for 2000 MPa galvanized wire and 2; 300 MPa PC strand " (NIPPON STEEL TECHNICAL REPORT.1999, (80): carbonized bodies is decomposed in the spheroidizing of passing through of having introduced Nippon Steel's exploitation 44-49), make microstructure be pearlitic texture and can reduce drawing, the intensity of twist process demixing phenomenon is 1770～1960 MPa Stranded Galvanized Steel Wires and is applied to alum and the outstanding stay cord of Kurushima bridge, and the bridge cable wire is used, tensile strength is the proprietary production technology of the galvanizing line of 2000 MPa; Also having Chinese patent application number is 201110342720.2 patent documentation, it discloses a kind of " ultrahigh-strength vanadium-titanium composite microalloyed high carbon steel wire rod and preparation method thereof ", its chemical ingredients (wt%) is C:0.79～0.84, Si:0.15～1.25, Mn:0.60～0.90, Cr:0.15～0.25, V:0.04～0.15, and add more than one Al:0.001～0.10, B:0.0005～0.0015, Ti:0.01～0.05, Nb:0.01～0.03, Mo:0.01～0.03, the high-carbon steel wire rod of explained hereafter can be used for making tensile strength and use Stranded Galvanized Steel Wire and tensile strength at the above 7mm galvanized steel wire of 1860 MPa at the bridge cable of the above 15.2mm of 1960MPa; Also having Chinese patent application number is 201010179972 patent documentation, it discloses " a kind of methods of the f5.0 of manufacturing mm 1860 MPa superstrength hot-dip galvanizing steel wires ", and its chemical ingredients (wt%) is C:0.81～0.90, Si:0.70～1.60, Mn:0.60～0.90, Ni:0.02～1.20, W:0.00～0.25, Al:0.015～0.030, Cr:0.00～0.70, V:0.00～0.15, Ca:0.002～0.006, P≤0.015, S≤0.015.
They are two years old, Application Areas is identical with this patent or approaching, but all adopt the thermal treatment process such as salt bath or lead bath quenching, as: Yasuhiro Oki " Development of 200 kgf/mm2 Grade High-strength Zinc-galvanized Wire " is (R.1999,49 (2): 8-11) introduced Japanese employing and in hypereutectoid steel, added Si and C alloy wire rod, through drawing, zinc-plated, the techniques such as thermal treatment, produce and be organized as nanostructure after zinc-plated, have excellent ductility, toughness, fatigue resistance, the delayed fracture rope, cable is used up to the zinc-plated twisted wire of 200 kgf/mm2 (1960 N/mm2) level; Chen Xianzhong " development of the zinc-plated rope making wire of obdurability Extra High Strength " (metal products .2009,35 (5): 11-13) having introduced Guizhou steel cable company, to choose the f8.0mm82A wire rod that Guizhou steel mill produces be starting material, after being drawn to the f6.20mm work in-process, it is 880～920 ℃ in Heating temperature, the patenting temperature is 540～560 ℃, take-up speed is to prepare tensile strength under the condition of 7～11m/min to reach 1365MPa, the sorbite volume fraction is greater than 96 %, be drawn to f2.40mm, the steel wire torsion value is 29.1 times behind electro-galvanizing, bending value is 16.1 times, tensile strength is 2209MPa, Zn-coat mass is the zinc-plated rope making wire of obdurability Extra High Strength of 243g/mm2; Feng Yueping " the 77MnA wire rod is manufactured experimently high-strength hot-dip zinc-coated steel strand " (metal products .2009,35 (5): 19-21) introduced Xinjiang eight steel and adopted the 77MnA wire rod of oneself producing through raw material production and surface treatment, drawing, degreasing, thermal treatment, help plating, the operations such as pot galvanize and strand system, wherein the pickling of normal temperature salt is adopted in surface treatment, phosphating process at medium temperature, less Reduction per draft is adopted in drawing, 715～730 ℃ of thermal treatment temps, heat-up time about 124s, take-up speed 8.5m/min, zinc liquid temperature is 455～465 ℃ during pot galvanize, zinc-plated time 12s, 7 steel wire despooling tensions should unanimously be produced power telecommunication High Strength Steel twisted wire during twisting; " NIPPON STEEL CORP.HIGH TENSILE STRENGTH WIRE ROD FOR STEEL WIRE EXCELLENT IN TWISTING VALUE AND ITS PRODUCTION " (Japan.No.JP19980034580), " NIPPON STEEL CORP.HIGH STRENGTH HIGH TOUGHNESS HIGH CARBON STEEL WIRE ROD AND PROCESS FOR PRODUCING THE SAME " (Japan.No.EP20040705540), " NIPPON STEEL CORP.PRODUCTION OF HIGH STRENGTH GALVANIZED STEEL WIRE " (Japan.No.JP08296008), " NIPPON STEEL CORP.HIGH-STRENGTH WIRE ROD HAVING SUPERIOR ROD DRAWABILITY; MANUFACTURING METHOD THEREFOR; AND HIGH-STRENGTH STEEL WIRE HAVING SUPERIOR ROD DRAWABILITY " is wire rod production and the processing patented technology of nippon (Japan.No.JP20060179741), all adopts salt bath or lead bath quenching or the thermal treatment process of austenitizing again.
In the prior art, in order to increase the initial strength of high-carbon steel wire rod 82B, generally all 0.15-0.25%Cr, 0.04-0.15%V and trace Ti etc. are added in single outside the 82B basic ingredient or combination, Cr, V can both increase the intensity of steel, but Cr is medium carbide forming element, and the Cr carbide is the most tiny a kind of carbide, and it can be evenly distributed in the steel, make structure refinement when making steel have high intensity, hardness and be evenly distributed plasticity and the toughness of raising steel; And the carbide of V solubleness in steel is relatively high, is often used as the intensity that improves high carbon steel, and V content causes work hardening than Gao Shiyi, and the toughness of steel is damaged.
Summary of the invention
The purpose of patent of the present invention is to overcome the deficiency that prior art exists, a kind of production φ 2.7-4.0mm is provided, need not to process through lead bath quenching, direct drawing, make the tensile strength 〉=1900MPa of steel wire, 1% elongation stress 〉=1600MPa, number of torsions 〉=20 time, especially applicable span of making 1 * 37 structure 〉=3500 meters overhead line carrying steel core is with galvanized steel wire and production method.
Realize the measure of above-mentioned purpose:
The overhead line carrying steel core galvanized steel wire of a kind of degree of leap 〉=3500 meter, its component and weight percent content are: C:0.79～0.84%, Mn:0.70～0.90%, Si:0.15～0.30%, P≤0.01%, S≤0.01%, Cr:0.28～0.35%, V:0.015～0.035%, all the other are Fe and inevitable impurity.
Produce the overhead line carrying steel core of a kind of degree of leap 〉=3500 meter with the method for galvanized steel wire, its step:
1) selecting diameter is the wire rod that 9～11mm, tensile strength are not less than 1180MPa;
2) carry out conventional pickling and bonderizing, and make the phosphorization membrane on wire rod surface even;
3) drawing, drawing passes are controlled to be 9～10 passages, and control average percentage pass reduction 19～21%, and drawing speed is controlled cooled Steel Wire Surface temperature and is no more than 60 ℃ at 2～3m/s; In drawing, keep lubricant evenly to overlay on Steel Wire Surface; Average percentage pass reduction calculates according to following formula:
In the formula: Qcp-represent that average percentage pass reduction, unit are %;
D-expression steel wire diameter, unit are mm;
D-expression wire rod diameter, unit is mm;
N-expression drawing passes;
4) zinc-plated, and the travelling speed v product value of control steel wire diameter d and wire galvanization is at 110～130mmm/min; D-expression steel wire diameter, unit are mm; The travelling speed of v-expression wire galvanization, unit is m/min;
5) stand-by.
The effect of V element among the present invention
The present invention is owing to adopt higher Cr content, and namely 0.28～0.35%, and trace V: 0.015～0.035%, make its initial strength that both can improve gren rod, can reduce again the injury to toughness index.
The present invention compared with prior art, the superstrength rank galvanized steel wire of the φ 2.70-4.60mm that produces, wire rod need not to process through lead bath quenching, direct drawing has reduced the pollution to environment, has reduced heat treatment step and the corresponding maintenance of the equipment work such as lead bath quenching, and under the simple condition of composition, make the tensile strength of the steel wire of producing at least at 1900MPa, 1% elongation stress is at least at 1600MPa, and number of torsions is at least at 20 times.
Embodiment
The below is described in detail the present invention:
The embodiment 1:G4A 7/3.60(1 * 7-10.08mm) production of Stranded Galvanized Steel Wire:
The wire rod composition of producing and weight percent content are C:0.80%, Si:0.22%, Mn:0.75%, Cr:0.35%, V:0.035%, S: 0.01%, P:0.0098%, and all the other are Fe and inevitable impurity;
The diameter D of its wire rod is 11mm, and initial tensile strength is 1195MPa, and relative reduction in area is 34%, and grain fineness number is 8 grades, and sorbite percentage is 90%, and steel wire diameter d is 3.60mm, and the travelling speed v of wire galvanization is 36m/min, and depressing number of times n is 10 times.
Its production stage:
1) producing diameter D is that 11.0mm, initial tensile strength are the wire rod of 1195MPa;
2) carry out conventional pickling and bonderizing, the phosphorization membrane on the wire rod surface behind bonderizing is even;
3) carry out drawing, drawing passes n is 10 times, the average draft 20.0% of passage, and drawing speed is at 2.0m/s, 45-50 ℃ of cooled Steel Wire Surface temperature; In drawing, keep lubricant evenly to overlay on Steel Wire Surface; Average percentage pass reduction calculates according to following formula:
Be respectively that 3.60mm, D are 11.0mm with d, n gets Qcp=20.0% after being 10 substitutions;
4) carry out zinc-platedly, the travelling speed v product value of steel wire diameter d and wire galvanization is at 130mmm/min, and steel wire diameter d is 3.60mm, and the travelling speed v of wire galvanization is 36m/min;
5) stand-by.
After testing, the tensile strength of its steel wire is 1985MPa, and 1% elongation stress is 1611MPa, elongation 4.4%, and reversing is 26 times, zinc coat mass is 284g/m
2
The production of embodiment 2:G4A φ 3.60mm galvanized steel wire:
The wire rod composition of producing and weight percent content are C:0.81%, Si:0.24%, Mn:0.82%, Cr:0.30%, V:0.030%, S:0.008%, P:0.009%, and all the other are Fe and inevitable impurity;
The diameter D of its wire rod is 10.0mm, and initial tensile strength is 1205MPa, and relative reduction in area is 32%, and grain fineness number is 8 grades, and sorbite percentage is 90%, and steel wire diameter d is 3.60mm, and the travelling speed v of wire galvanization is 36m/min, and depressing number of times n is 9 times.
Its production stage:
1) producing diameter D is that 10.0mm, initial tensile strength are the wire rod of 1205MPa;
2) carry out conventional pickling and bonderizing, the phosphorization membrane on the wire rod surface behind bonderizing is even;
3) carry out drawing, drawing passes n is 9 times, the average draft 20.3% of passage, and drawing speed is at 2.0m/s, 45-50 ℃ of cooled Steel Wire Surface temperature; In drawing, keep lubricant evenly to overlay on Steel Wire Surface; Average percentage pass reduction calculates according to following formula:
Be respectively that 3.60mm, D are 10.0mm with d, n gets Qcp=20.3% after being 9 substitutions;
4) carry out zinc-platedly, the travelling speed v product value of steel wire diameter d and wire galvanization is at 130mmm/min, and steel wire diameter d is 3.60mm, and the travelling speed v of wire galvanization is 36m/min;
After testing, the tensile strength of its steel wire is 1960MPa, and 1% elongation stress is 1620MPa, elongation 4.8%, and reversing is 30 times, zinc coat mass is 305g/m
2
The embodiment 3:G4A 37/3.14(1 * 37-22mm) production of Stranded Galvanized Steel Wire:
The wire rod composition of producing and weight percent content are C:0.81%, Si:0.25%, Mn:0.80%, Cr:0.32%, V:0.025, S:0.00951%, P:0.0097%, and all the other are Fe and inevitable impurity;
The diameter D of its wire rod is 10.0mm, and initial tensile strength is 1200MPa, and relative reduction in area is 33%, and grain fineness number is 8 grades, and sorbite percentage is 90%, and steel wire diameter d is 3.14mm, and the travelling speed v of wire galvanization is 38m/min, and depressing number of times n is 10 times.
Its production stage:
1) producing diameter is 10.0mm, and initial tensile strength is the wire rod of 1200MPa;
2) carry out conventional pickling and bonderizing, the phosphorization membrane on the wire rod surface behind bonderizing is even;
3) carry out drawing, drawing passes n is 10 times, and the average draft of passage is 20.7%, and drawing speed is at 2.5m/s, 45-50 ℃ of cooled Steel Wire Surface temperature; In drawing, keep lubricant evenly to overlay on Steel Wire Surface; Average percentage pass reduction calculates according to following formula:
Be respectively that 3.14mm, D are 10.0mm with d, n gets Qcp=20.7% after being 10 substitutions;
4) carry out zinc-platedly, the travelling speed v product value of steel wire diameter d and wire galvanization is at 120mmm/min, and steel wire diameter d is 3.14mm, and the travelling speed v of wire galvanization is 38m/min;
5) stand-by.
After testing, the tensile strength of its steel wire is 1930MPa, and 1% elongation stress is 1690MPa, elongation 5.6%, and reversing is 28 times, zinc coat mass is 362g/m
2
The production of embodiment 4:G4A φ 3.14mm galvanized steel wire:
The wire rod composition of producing and weight percent content are C:0.83%, Si:0.20%, Mn:0.78%, Cr:0.28%, V:0.015%, S:0.0085%, and P:0.0092%, all the other are Fe and inevitable impurity;
The diameter D of its wire rod is 9.0mm, and initial tensile strength is 1220MPa, and relative reduction in area is 32%, and grain fineness number is 8 grades, and sorbite percentage is 90%, and steel wire diameter d is 3.14mm, and the travelling speed v of wire galvanization is 38m/min, and depressing number of times n is 9 times.
Its production stage:
1) producing diameter is 9.0mm, and initial tensile strength is the wire rod of 1220MPa;
2) carry out conventional pickling and bonderizing, the phosphorization membrane on the wire rod surface behind bonderizing is even;
3) carry out drawing, drawing passes n is 9 times, and the average draft of passage is 20.9%, and drawing speed is at 2.5m/s, 45-50 ℃ of cooled Steel Wire Surface temperature; In drawing, keep lubricant evenly to overlay on Steel Wire Surface; Average percentage pass reduction calculates according to following formula:
Be respectively that 3.14mm, D are 9.0mm with d, n gets Qcp=20.9% after being 9 substitutions;
4) carry out zinc-platedly, the travelling speed v product value of steel wire diameter d and wire galvanization is at 120mmm/min, and steel wire diameter d is 3.14mm, and the travelling speed v of wire galvanization is 38m/min;
After testing, the tensile strength of its steel wire is 1925MPa, and 1% elongation stress is 1650MPa, elongation 5.6%, and reversing is 29 times, zinc coat mass is 318g/m
2
The production of embodiment 5:G4A φ 3.0mm galvanized steel wire:
The wire rod composition of producing and weight percent content are C:0.83%, Si:0.26%, Mn:0.79%, Cr:0.28%, V:0.025%, S:0.009%, and P:0.0098%, all the other are Fe and inevitable impurity;
The diameter D of its wire rod is 9.0mm, and initial tensile strength is 1210MPa, and relative reduction in area is 32%, and grain fineness number is 8 grades, and sorbite percentage is 90%, and steel wire diameter d is 3.0mm, and the travelling speed v of wire galvanization is 37m/min, and depressing number of times n is 10 times.
Its production stage:
1) producing diameter is 9.0mm, and initial tensile strength is the wire rod of 1210MPa;
2) carry out conventional pickling and bonderizing, the phosphorization membrane on the wire rod surface behind bonderizing is even;
3) carry out drawing, drawing passes n is 10 times, the average draft 19.7% of passage, and drawing speed is at 3m/s, 45-50 ℃ of cooled Steel Wire Surface temperature; In drawing, keep lubricant evenly to overlay on Steel Wire Surface; Average percentage pass reduction calculates according to following formula:
Be respectively that 3.0mm, D are 9.0mm with d, n gets Qcp=19.7% after being 10 substitutions;
4) carry out zinc-platedly, the travelling speed v product value of steel wire diameter d and wire galvanization is at 110mmm/min, and steel wire diameter d is 3.0mm, and the travelling speed v of wire galvanization is 37m/min;
After testing, the tensile strength of its steel wire is 1950MPa, and 1% elongation stress is 1643MPa, elongation 4.8%, and reversing is 29 times, zinc coat mass is 275g/m2.
Above-described embodiment only exemplifies for the best, and is not to be restriction to embodiments of the present invention.
Claims (2)
1. the overhead line carrying steel core galvanized steel wire of degree of leap 〉=3500 meter, its component and weight percent content are: C:0.79～0.84%, Mn:0.70～0.90%, Si:0.15～0.30%, P≤0.01%, S≤0.01%, Cr:0.28～0.35%, V:0.015～0.035%, all the other are Fe and inevitable impurity.
2. produce a kind of degree of leap as claimed in claim 1 〉=3500 meters overhead line steel core method of steel wire, its step:
Produce the overhead line carrying steel core of a kind of degree of leap 〉=3500 meter with the method for galvanized steel wire, its step:
1) selecting diameter is the wire rod that 9～11mm, tensile strength are not less than 1180MPa;
2) carry out conventional pickling and bonderizing, and make the phosphorization membrane on wire rod surface even;
3) drawing, drawing passes are controlled to be 9～10 passages, and control average percentage pass reduction 19～21%, and drawing speed is controlled cooled Steel Wire Surface temperature and is no more than 60 ℃ at 2～3m/s; In drawing, keep lubricant evenly to overlay on Steel Wire Surface; Average percentage pass reduction calculates according to following formula:
In the formula: Qcp-represent that average percentage pass reduction, unit are %;
D-expression steel wire diameter, unit are mm;
D-expression wire rod diameter, unit is mm;
N-expression drawing passes;
4) zinc-plated, and the travelling speed v product value of control steel wire diameter d and wire galvanization is at 110～130mmm/min; D-expression steel wire diameter, unit are mm; The travelling speed of v-expression wire galvanization, unit is m/min;
5) stand-by.
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| CN2012105425386A CN103014508A (en) | 2012-12-14 | 2012-12-14 | Steel wire for aerial cable steel core with spanning degree not smaller than 3500m and production method thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105170669A (en) * | 2015-10-26 | 2015-12-23 | 贵州钢绳股份有限公司 | Drawing process of long-diameter high-carbon wire |
| CN106111726A (en) * | 2016-06-30 | 2016-11-16 | 东南大学 | A kind of production method of high intensity height twisting property bridge cable zinc-coated wire |
| 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 |
| CN113897544A (en) * | 2021-09-02 | 2022-01-07 | 包头钢铁（集团）有限责任公司 | Wire rod for rare earth high-strength high-toughness prestressed steel strand and smelting and rolling production method thereof |
| CN113981312A (en) * | 2021-09-29 | 2022-01-28 | 武钢集团昆明钢铁股份有限公司 | Hot-rolled wire rod for high-strength low-relaxation prestressed steel strand and preparation method thereof |
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| CN101085454A (en) * | 2007-06-26 | 2007-12-12 | 宝钢集团上海二钢有限公司 | Method for preparing phi7.0mm1770MPa high-strength low-relaxation zinc-coated wire |
| CN102341194A (en) * | 2009-03-02 | 2012-02-01 | 株式会社普利司通 | Method of producing steel wire |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101085454A (en) * | 2007-06-26 | 2007-12-12 | 宝钢集团上海二钢有限公司 | Method for preparing phi7.0mm1770MPa high-strength low-relaxation zinc-coated wire |
| CN102341194A (en) * | 2009-03-02 | 2012-02-01 | 株式会社普利司通 | Method of producing steel wire |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105170669A (en) * | 2015-10-26 | 2015-12-23 | 贵州钢绳股份有限公司 | Drawing process of long-diameter high-carbon wire |
| CN106111726A (en) * | 2016-06-30 | 2016-11-16 | 东南大学 | A kind of production method of high intensity height twisting property bridge cable zinc-coated wire |
| 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 |
| CN113897544A (en) * | 2021-09-02 | 2022-01-07 | 包头钢铁（集团）有限责任公司 | Wire rod for rare earth high-strength high-toughness prestressed steel strand and smelting and rolling production method thereof |
| CN113981312A (en) * | 2021-09-29 | 2022-01-28 | 武钢集团昆明钢铁股份有限公司 | Hot-rolled wire rod for high-strength low-relaxation prestressed steel strand and preparation method thereof |
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Application publication date: 20130403 |