CN101565797B - High-strength galvanized steel wire and application thereof in bridge cable manufacture - Google Patents
High-strength galvanized steel wire and application thereof in bridge cable manufacture Download PDFInfo
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- CN101565797B CN101565797B CN200810036413XA CN200810036413A CN101565797B CN 101565797 B CN101565797 B CN 101565797B CN 200810036413X A CN200810036413X A CN 200810036413XA CN 200810036413 A CN200810036413 A CN 200810036413A CN 101565797 B CN101565797 B CN 101565797B
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Abstract
The invention provides a high-strength galvanized steel wire which comprises a steel wire core and a galvanized layer. The steel wire core comprises the following components by weight percentage: 0.75to 0.95 of C, 0.5 to 1.2 of Si, 0.5 to 1.0 of Mn, 0.1 to 0.5 of Cr, 0.01 to 0.1 of Nb, 0.02 to 0.1 of V, 0.01 to 0.05 of Al, less than or equal to 0.010 of P, 0.010 of S and the balance of Fe and ine vitable impurities. The high-strength galvanized steel wire does not markedly improve the contents of the C and the Cr, improves the content of the Si, controls the contents of the P and the S within a certain range by adding the Nb, the V and other microalloy elements, and ensures that the steel wire has excellent plasticity and toughness index while improving the steel wire strength. With favorable matching of the strength and the torsion performance, the galvanized steel wire can be used for manufacturing bridge cables with high requirements on strength, plasticity and toughness.
Description
Technical field
The present invention relates to a kind of steel wire, specifically, the present invention relates to a kind of bridge cable high-strength galvanized steel wire.
Background technology
For a long time, bridge cable all adopts cold-drawn perlite steel wire to produce in batches with high-strength galvanized steel wire, and its tension index generally all maintains between 1470～1770Mpa.But, along with the construction in succession of many longer bridges in the world, the span length's degree that wherein has even surpassed 2000m, correspondingly, other requirement has surpassed 1770Mpa to bridge to the intensity of steel wire level, even reaches 2000Mpa, and its plasticity and toughness index for intensity of steel wire does not descend; Meanwhile, in order to reduce the cable radical, alleviate deadweight and then reduce cost, the trend that the diameter standard of zinc-coated steel wire for main rope of suspension bridge is replaced by φ 7.0mm from traditional φ 5.0mm is arranged, and the diameter standard of cable-stayed bridge generally is φ 7.0mm rank, for example, adopt the φ 7.0mm galvanized steel wire of 1770MPa intensity rank at the logical bridge of AngChuan Zhou, Hong Kong bridge of founding a capital and Jiangsu of having completed Soviet Union.Traditional galvanized steel wire product can not satisfy high like this requirement.In addition, because the pay attention to day by day safe in utilization to bridge, many bridges plasticity and toughness index to steel wire in process of construction has proposed new requirement, be embodied in the requirement to the steel wire twisting property, simultaneously for saving cost, reduce the radical of main push-towing rope under the premise that security is guaranteed, this all has higher requirement to the comprehensive mechanical property of galvanized steel wire as far as possible.
Existing bridge cable generally all uses Japan or homemade 82B wire rod with galvanized steel wire, then selects for use 87MnQL wire rod (1770Mpa level) and Japanese Nippon Steel to produce high strength wire rod (1860Mpa level) for the higher cable of requirement of strength.The chemical ingredients and the performance of its matured product are as shown in table 1.
In addition, except that matured product shown in the table 1,, obtain the high-strength galvanized steel wire of being correlated with altogether, see Table 2 with 7 pieces in the patent of invention document of steel by patent retrieval.
The chemical ingredients of the existing galvanized steel wire matured product of table 1
The composition design (wt%) of galvanized steel wire in the existing patent documentation of table 2
As can be seen from the above table, Japan is the main research effort of high-strength galvanized steel wire design of alloy in the world, domestic relevant patent then is mainly the following process aspect of wire rod, but from manufacturing experience for many years, it is single that to promote the amplitude of intensity of steel wire from steel wire drawing process and heat treatment reinforcement more and more narrow, therefore the intensity that improves the galvanized steel wire wire rod becomes main development trend, and its mentality of designing mainly contains:
1, improves the content of Cr in the steel, as patent documentation JP59157267A, JP60208463A and JP60208464A.Wherein in improving steel, improved the content of Si among JP59157267A, the JP60208464A in the Cr content, to reduce the loss of strength of steel wire in pot galvanize;
2, add trace alloying element, utilize its strengthening effect (dispersion-strengthened, refined crystalline strengthening) to improve the intensity of wire rod and steel wire, all adopt microalloy elements such as adding Mo, B, Ti, Nb and V to improve steel wire properties as patent documentation JP60208463A, JP62004859A and JP04236742A;
3, C content improves steel grade intensity in the increase steel, sees patent documentation JP07286244A, JP08296022A.
Yet relevant in the world at present steel grade patent also has very big deficiency, mainly concentrates on the following aspects:
1, the content that improves Cr in the steel helps to improve the intensity of material, but from experience in the past, adopt the steel alloy of high Cr easily in tissue, to produce quenching structure on the domestic product line, influence the following process of steel wire, adopt salt bath quenching then can effectively address this problem abroad, but should produce line because seriously polluted forbidding at home, and therefore adopt to increase Cr to improve steel grade intensity be worthless at present at home;
2, all improve the intensity of steel grade in the Japanese documentation (JP60208463A, JP62004859A, JP04236742A) with microalloying, but its maximum intensity rank all is target value (7mm) with 1770Mpa, can't satisfy higher requirement of strength, these patent documentations are point of penetration with the intensity that improves material all simultaneously, its microalloy strengthening effect can not satisfy the growing needs of galvanized steel wire fully, and can not improve the twisting property of steel wire well, these patent documentations are not inquired into regard to the specification of galvanized steel wire and the relation of intensity yet;
3, improve carbon content and will smelt to control to steel grade and bring difficulty, particularly for converter smelting, and the segregation of carbon also easily influences the plasticity and toughness index of finished product steel wire and particularly reverses index;
4, except that JP60208464A, other patent documentations all do not relate to the content that reduces P, studies show that, P content particularly has fundamental influence to twisting property for the final performance of wire rod and finished product steel wire.
Therefore, the object of the present invention is to provide a kind of intensity and plasticity and toughness to reach the high-strength galvanized steel wire of good combination, with satisfy in the bridge construction to intensity of steel wire and the requirements at the higher level of reversing index.
Summary of the invention
The invention provides a kind of galvanized steel wire, comprise wire-core and zinc coating, it is characterized in that, described wire-core comprises the moiety of following mass percent:
C：0.75％～0.95％
Si：0.5％～1.2％
Mn：0.5％～1.0％
Cr：0.1％～0.5％
Nb：0.01％～0.1％
V：0.02％～0.1％
Al：0.01％～0.05％
P：≤0.010％
S：≤0.010％
All the other are iron and inevitably are mingled with that the impurity element total amount is lower than 0.5%.
The foundation that galvanized steel wire core chemical ingredients scope of the present invention is selected:
C: carbon is to guarantee the necessary composition of strength of galvanized wire, increase C content, improve the intensity that the cementite ratio can increase wire rod, but for avoiding separating out in early days cementite, C content answers＜0.98%; But if improve the content of C simply, steel grade segregation and plasticity and toughness will have deterioration to a certain degree.Therefore, comprehensive above factor, the carbon content scope selects 0.75%～0.95%.
Si: silicon is non-carbide forming element, mainly is dissolved in ferrite, reaches enhancement purpose thereby form the alloy ferrite.Increase Si content and can play the effect of strengthening F, and at F and Fe
3The enrichment of C interface slows down stratiform cementite decomposition rate, the loss of strength when reducing pot galvanize; But the Si too high levels can promote Fe
3C forms graphite carbon, and steel grade toughness plasticity and fatigue strength performance are descended significantly, therefore seldom uses as the interpolation element of intensified high-carbon steel.The alloying outline generally believes that when the content of Si surpassed 0.6%, its impelling strength just had downtrending, thereby the silicon containing steel majority is used for low-carbon and low-alloy structural steel and alloy spring steel.But for remedying the loss of strength of steel wire in hot galvanizing process, the Si content range selects 0.5%～1.2%.
Mn: manganese can be dissolved in ferrite, plays the effect of solution strengthening, can also strengthen austenitic stability, reduces M
sPoint improves hardening capacity, and simultaneously, Mn helps eliminating the deleterious effect of S, helps deoxidation again.Discover, when Mn content less less than 0.5% time effect, but manganese has the tendency of grain growth and decarburization, adds excessive meeting and makes grain coarsening, and toughness descends, surface decarburization, mechanical properties decrease, when Mn content surpassed 1.0%, hardening capacity improved very big, toughness degenerates when hot rolling, can influence the production of steel wire.Therefore the Mn content range selects 0.5%～1.0%.
Cr: chromium is strong carbide telogenesis element, and it is the displacement intravital iron atom of carburizing and form alloyed cementite (Fe.Cr) basically
3C can strengthen the avidity of Fe and C, thereby improves its stability, and austenite crystal is grown up when stoping hot rolling, improves sorbitizing and forms ability.It is often used with high level manganese in structural carbon steel simultaneously, the KKP wire rod that American-European and Japan generally adopts, Japanese kobe steel adds the exploitation of Gu Chuan factory, be exactly on the SWRS82B basis, add 0.1%～0.3% chromium, after the stelmor cooling, obtain well behaved sorbitizing wire rod.Therefore, the Cr content range selects 0.1%～0.5%.
Nb: add the tissue that niobium can improve the intensity of material and improve material in the steel, but its reason is the grain-size of refinement original austenite after the Nb adding, improves the comprehensive mechanical property of steel; Simultaneously the recovery rate of Nb in molten steel nearly 100%, and alloying is accurate, and it is little to be reflected on the performance data dispersity; In addition, the carbonitride of Nb can " pinning " crystal boundary when steel rolling, stops grain growth, and solid solution Nb in crystal boundary enrichment concentration up to (atomic ratio) more than 1.0%, intracrystalline is lower, so it has the dual ability that crystal boundary moves that pulls strongly.For the ratio (2: 3) that Nb is existed with precipitate form and solid solution attitude in thermal distortion reaches best, the Nb content range selects 0.01%～0.1%.
V: vanadium be a kind of can refinement steel grain structure, improve the intensity and the flexible element of steel, and when it when high temperature fuses into austenite, can increase the hardening capacity of steel.The carbide of V and nitride can play the effect of precipitation strength.If the content of V is lower than 0.02%, strengthening effect is not obvious; If a large amount of precipitations of the carbide of V and nitride will cause the toughness of steel to descend, therefore, the V content range selects 0.02%～0.1%, takes compound interpolation Nb, V to improve the steel grade over-all properties simultaneously.
P, S: studies show that P content has remarkable influence for the segregation of high carbon steel, the plasticity and toughness that can significantly worsen the finished product galvanized steel wire particularly reverse index; The existence of S will exert an influence to the toughness of steel grade.Therefore the P content range selects≤0.010%; The S content range selects≤0.010%.
The present invention also provides the application of this galvanized steel wire on bridge cable.Because described steel wire can reach the good combination of intensity and plasticity and toughness index, and the selection tachnical storage can be provided for the requirement of high strength in the bridge construction and high twisting property.
Beneficial effect of the present invention is:
1, in not obvious raising steel grade under the prerequisite of carbon, chromium content, improve the intensity of material by microalloy elements such as compound interpolation Nb, V, to reach the high-strength galvanized steel wire of the above grade of steel Φ of 1860MPa 7.0mm, help the steel grade converter and produce, saved production cost greatly;
2, improve the content of Si in the steel, to reduce the loss of strength of steel wire in galvanizing;
3, control P content guarantees that the plasticity and toughness of finished product steel wire particularly reverse index below 100ppm.
Embodiment
Below for a more detailed description with embodiment to the present invention.These embodiment only are the descriptions to best mode for carrying out the invention, scope of the present invention are not had any restriction.
Table 3 is depicted as the chemical ingredients of experiment steel grade, and wherein A1～A5 be a steel grade of the present invention, and B1～B3 is the contrast steel grade, the galvanized steel wire steel grade that generally uses for present bridge.
The chemical ingredients of table 3 steel of the present invention and contrast steel, wt%
The B1 grade of steel is homemade 82B;
The B2 grade of steel is 87MnQL;
The B3 grade of steel is the Japanese 1860MPa of Nippon Steel level (Φ 7.0mm) steel grade.
Experimental steel finished product steel wire trial process is: vacuum induction furnace smelting-breaking down cogging-rod rolling (air-cooled)-wire rod (Φ 13.5mm)-follow-up drawing-lead bath-pickling-pot galvanize-stabilization-finished product steel wire (Φ 7.0mm).
Wire rod and finished product steel wire to steel grade of the present invention and contrast steel grade carries out Performance Detection respectively, and be specific as follows:
Experimental steel after stelmo line is air-cooled, detects the mechanical property of test steel wire rod through smelting, the laggard line material of breaking down cogging rolling (Φ 13.5mm is an example), and the result is as shown in table 4:
The mechanical property of table 4 steel of the present invention and contrast steel wire rod relatively
From the result of table 4 as can be seen, the intensity rank of steel of the present invention all is higher than the contrast steel, and steel A1 of the present invention, A2 embody cooperating of good intensity and plasticity and toughness simultaneously.The present invention is with after the smelting of steel process, breaking down cogging, rod rolling and the rational process for cooling, can obtain the bridge galvanized steel wire wire rod that mechanical property satisfies the 1860MPa higher level, content by carbon in the stabilized steel helps to solve the segregation problem of carbon and alloy in the smelting process simultaneously, greatly reduces the risk that index does not conform to of reversing of finished product steel wire.
Test wire rod with hot rolling after air-cooled is made the finished product steel wire again after operations such as drawing, lead bath, pickling, pot galvanize, stabilization are handled, its intensity of check and analysis and reverse index, and the result is as shown in table 5:
Table 5 steel of the present invention compares with the value of reversing with contrast steel finished product intensity of steel wire
As can be seen from Table 5, invention steel A1, A2 have reached good effect on the coupling of intensity and twisting property, can satisfy the required requirement of strength of bridge fully by the subsequent technique of steel wire rod of the present invention is handled its intensity rank of finished product steel wire that obtains, and the plasticity and toughness index does not reduce greater than the 1860MPa grade of steel.
To sum up, the present invention is guaranteeing under the prerequisite of carbon content in certain limit on traditional galvanized steel wire basis, the not obvious content that improves C, Cr, add trace alloying elements such as Nb, V to improve the intensity of wire rod and finished product steel wire, the content that increases Si simultaneously is to remedy the loss of strength of material after pot galvanize, in addition, P, S content are controlled at below the certain limit particularly reverse index with the plasticity and toughness index of guaranteeing steel wire.
Claims (2)
1. a galvanized steel wire comprises wire-core and zinc coating, it is characterized in that, described wire-core comprises the moiety of following mass percent:
C：0.75％～0.95％
Si：0.5％～1.2％
Mn：0.5％～1.0％
Cr：0.1％～0.5％
Nb：0.01％～0.1％
V：0.02％～0.1％
Al：0.01％～0.05％
P：≤0.010％
S：≤0.010％
All the other are iron and unavoidable impurities.
2. the application of the described galvanized steel wire of claim 1 on bridge cable is made.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810036413XA CN101565797B (en) | 2008-04-22 | 2008-04-22 | High-strength galvanized steel wire and application thereof in bridge cable manufacture |
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| Application Number | Priority Date | Filing Date | Title |
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| CN200810036413XA CN101565797B (en) | 2008-04-22 | 2008-04-22 | High-strength galvanized steel wire and application thereof in bridge cable manufacture |
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| Publication Number | Publication Date |
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| CN101565797A CN101565797A (en) | 2009-10-28 |
| CN101565797B true CN101565797B (en) | 2011-03-30 |
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| CN200810036413XA Withdrawn - After Issue CN101565797B (en) | 2008-04-22 | 2008-04-22 | High-strength galvanized steel wire and application thereof in bridge cable manufacture |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105112807B (en) * | 2015-10-08 | 2017-02-01 | 武汉钢铁(集团)公司 | High-strength bridge cable steel with pearlite inter-lamellar spacing smaller than 150nm and production method |
| CN105803176B (en) * | 2016-03-16 | 2018-05-15 | 东南大学 | A kind of method for improving bridge cable zinc-coated wire twisting property |
| CN109554631B (en) * | 2017-09-26 | 2021-08-17 | 宝山钢铁股份有限公司 | Low alloy steel and high-strength high-plasticity wire rod prepared from same and used for processing steel wire |
| CN108239722B (en) * | 2018-03-02 | 2019-10-22 | 山东钢铁股份有限公司 | A kind of the Weather-resistance bridge steel plate and its production method of yield strength >=420MPa |
| CN112501506B (en) * | 2020-11-15 | 2022-03-01 | 江苏永钢集团有限公司 | Steel wire rod for bridge cable and manufacturing method thereof |
| CN114855086A (en) * | 2022-05-21 | 2022-08-05 | 湖南华菱湘潭钢铁有限公司 | Production method of steel wire rod for 2100MPa bridge cable |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN100366776C (en) * | 2003-01-27 | 2008-02-06 | 新日本制铁株式会社 | High-carbon steel wire rod with high strength and high toughness |
-
2008
- 2008-04-22 CN CN200810036413XA patent/CN101565797B/en not_active Withdrawn - After Issue
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100366776C (en) * | 2003-01-27 | 2008-02-06 | 新日本制铁株式会社 | High-carbon steel wire rod with high strength and high toughness |
| 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 |
Non-Patent Citations (1)
| Title |
|---|
| JP特开2001-181788A 2001.07.03 |
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