CN102936688A - Wire with tensile strength>=2000MPa for bridge cable and production method - Google Patents
Wire with tensile strength>=2000MPa for bridge cable and production method Download PDFInfo
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- CN102936688A CN102936688A CN2012104731223A CN201210473122A CN102936688A CN 102936688 A CN102936688 A CN 102936688A CN 2012104731223 A CN2012104731223 A CN 2012104731223A CN 201210473122 A CN201210473122 A CN 201210473122A CN 102936688 A CN102936688 A CN 102936688A
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Abstract
The invention discloses a wire with tensile strength>=2000MPa for a bridge cable and a production method. The wire comprises, by weight, 0.95-1.2% of C, 0.1-0.48% of Si, 0.6-1.0% of Mn, 0.1-0.5% of Cr, 0.01-0.05% of V, Cu<=0.05%, 0.05-0.15% of Al, 0.01-0.03% of N, P<=0.025% and S<=0.015%. The production method includes smelting and continuously casting into blanks; heating the casting blanks; rolling; heating again; high-speed rolling; spinning; air cooling to the room temperature; and placing for standby. According to the wire and the method, continuous casting of blooms, rolling starting of billets and high speed wire rolling are adopted, therefore a metallographic structure and the like of the wire for the bridge cable are even, and grains are better refined; and processes of rapid cooling with a large air volume and the like are adopted, therefore the tensile strength of the wire for the bridge cable is >=2000MPa and stable, a twist number reaches >=15, and wire fracture caused by the wire quality does not happen during cold drawing.
Description
Technical field
The present invention relates to wire rod and production method thereof, belong to particularly wire rod and production method thereof for bridge cable, is wire rod and the production method for bridge cable of tensile strength >=2000MPa definitely.
Background technology
At present, production at bridge cable with wire rod, with regard to tensile strength at 1200MPa to 1900MPa with interior, the deficiency existed is that the tensile strength fluctuation is large, unstable, particularly in summer, be subject to the impact of envrionment temperature, when the wire rod of the thick specification of high speed wire rolling, the cooling power deficiency of stelmo line, it is more outstanding that this phenomenon shows.
Yet with regard to existing market, according to the development of bridge, need the above bridge cable wire rod of 2000MPa, so, produce difficulty just larger, performance more is difficult to assurance.
Look into the document of publishing, the patent documentation of report relevant for bridge rope steel wire rod: Chinese Patent Application No.: CN201110103180.2, it discloses " a kind of 1670MPa level bridge cable is wire rod and preparation method for galvanized steel wire ", and what it adopted is the technique of continuous small-billet casting → high speed wire rolling.Although its component and content can be guaranteed the intensity of wire rod and be greater than 1200MPa, can't make the intensity of bridge rope steel wire rod reach 2000MPa.In addition, according to the test-results of Baosteel and Wuhan Iron and Steel Plant, its production technique be difficult to guarantee strength property stable of bridge rope steel wire rod.
Chinese Patent Application No. CN201210132587.2: patent documentation, it discloses " wire rod and manufacture method thereof for a kind of 1860MPa level bridge cable galvanized steel wire ", its rolling technology adopts higher rolling temperature, can reduce the sorbite ratio in wire rod, be unfavorable for the raising of wire rod tensile strength.Although its component and content can be guaranteed the intensity of wire rod and be greater than 1200MPa, can't make the bridge rope reach 2000MPa by the intensity of steel wire.In addition, the deficiency that its technique exists: 1) in casting cycle owing to adopting argon shield, there is no clear and definite other control technique, blank heart section carbon segregation is lower than 1.08.
The patent documentation of Chinese Patent Application No. CN201010291415.0, it discloses " a kind of high-strength high-carbon steel wire rod and production method thereof. ", it is the steel wire that the diameter of production is 5.5 ~ 8.0mm, it is only the steel of carbon containing, manganese element, its composition has determined to expect high-intensity wire rod, can only pass through the larger draft of strand, produce the wire rod that diameter is less than 8.0mm.
The patent documentation of Chinese Patent Application No. CN200710093823.3, it discloses " wire rod and manufacture method thereof for a kind of 1770MPa level bridge stay cable galvanized steel wire. ", this invention for 1860MPa level bridge cable galvanized steel wire for wire rod, although component and content can be guaranteed the intensity of wire rod and be greater than 1200MPa, can't make the intensity of steel wire reach 2000MPa.
Summary of the invention
The object of the invention is to overcome at present can not the satisfying the market requirement tensile strength be greater than the demand of the bridge cable of 2000MPa with wire rod, and the unsettled deficiency of strength property, provide that a kind of composition is simple, bridge cable is greater than 2000MPa and stablizes by the tensile strength of steel wire, the torsion value reaches >=and 15 times, do not produce wire rod and the production method for bridge cable of fracture of wire phenomenon in the cold drawing process.
Realize the measure of above-mentioned purpose:
The bridge cable wire rod of tensile strength >=2000MPa, its component and weight percent content are: C:0.95～1.2%, Si:0.1%～0.48%, Mn:0.6～1.0%, Cr:0.1～0.5%, V:0.01～0.05%, Cu≤0.05%, Al:0.05～0.15%, N:0.01～0.03%, P≤0.025%, S≤0.015%, surplus is Fe and inevitable impurity.
The method of wire rod for the bridge cable of production tensile strength >=2000MPa, its step:
1) smelt also continuous casting and become base, the cross dimensions of controlling strand is at least 300 х 400mm; Control the tundish superheating temperature and be no more than 20 ℃; Control casting speed at 0.3～0.6m/min; The section draft of controlling after strand is gently depressed is not more than 8.0%;
2) strand is heated, controlled soaking temperature at 1250～1500 ℃, control time inside furnace and be not less than 300min;
3) be rolled, control start rolling temperature and be not less than 1200 ℃; Open rolling becomes cross dimensions to be not more than the square billet of 250 * 250mm;
4) again heat, control soaking temperature not higher than 1050 ℃, soaking time 100～200 min;
5) carry out high-speed rolling, control the roughing start rolling temperature at 900～980 ℃, control the finish rolling start rolling temperature not higher than 850 ℃;
6) weaved silk, control laying temperature and be not less than 920 ℃;
7) air-cooled to room temperature, control air-cooled line roller table speed extreme difference 1.05～1.12, control speed of cooling at 5～15 ℃/S;
8) stand-by.
A kind of bridge cable of the present invention is as follows by the mechanism of action of each alloy ingredient in carbon steel wire rod with high:
Carbon of the present invention (C) content is 0. 95 ~ 1.20%, and carbon is most important component in steel, and carbon content directly determines its intensity and plasticity.Under cold drawn state, tensile strength improves constantly with the increase of carbon content, plasticity with carbon content increase reduce.
Silicon of the present invention (Si) content is 0.10%～0.48%, and silicon is also as a kind of reductor, with the ferrosilicon form, adds in steel, can eliminate the detrimentally affect that FeO is mingled with, and steel are played a part to even compact.The rising of silicone content, can obviously improve the elastic limit of steel wire, but also can make plasticity, toughness and ductility obviously reduce.When silicon appears in steel with the silicate form, unfavorable to drawing, wortle is is easily worn and torn, or form inclusion and cause steel wire fracture, the antiacid tendency of washing is arranged simultaneously, also unfavorable to pickling.
Manganese of the present invention (Mn) content is 0.60%～1.0%, and it is the good reductor of steel-making, smelts the manganese sulfide, the manganese oxide that generate in reaction the cold drawn performance of wire rod is not produced to harmful effect, and manganese becomes MnS can also alleviate the deleterious effect of sulphur with the sulfuration symphysis.Manganese can also increase the perlite relative quantity, and perlite is attenuated.So the increase of manganese content can make the intensity of steel wire and hardness improve, yield strength and relative reduction in area also increase to some extent.The manganese major part is dissolved in ferrite, forms substitutional solid solution, and makes the ferrite carbonization.Manganese can increase austenitic stability, reduces the critical transition temperature of steel.And manganese can also increase the superheated susceptivity of steel, while making thermal treatment, crystal grain is easily grown up, and affects impelling strength.
Phosphorus of the present invention (P) content≤0.025%, sulphur (S) content≤0.015%.Phosphorus has disadvantageous effects such as easily causing segregation, deterioration welding property, the low-temperature impact toughness that significantly reduces steel, raising brittle transition temperature in steel.The easy generation MnS of being combined with manganese of sulphur is mingled with, and sulphur also affects the low-temperature impact toughness of steel.Therefore, the present invention should reduce as far as possible phosphorus, element sulphur to rigidity can disadvantageous effect, by molten iron being carried out to the means such as dark desulfurization pre-treatment, vacuum-treat, control phosphorus, sulphur content, thereby alleviate its disadvantageous effect.
The present invention selects chromium (Cr) content 0.1～0.5%.Chromium can significantly improve intensity, hardness and wear resistance, can also improve oxidation-resistance and the erosion resistance of steel.
The present invention selects vanadium (V) content 0.01～0.05%.Vanadium is the good reductor of steel.But the vanadium thinning microstructure crystal grain in steel, improve intensity and toughness.The carbide that vanadium and carbon form can improve anti-hydrogen-type corrosion ability under High Temperature High Pressure.It separates out with VC and the small particle of VN when 500 ℃～700 ℃ of temperature tempering, can play precipitation strength.
Aluminium of the present invention (Al) content 0.05 ~ 0.15%, aluminium is a kind of effective reductive agent.But the aluminium thinning microstructure crystal grain in steel, improve intensity and toughness.The carbide that vanadium and nitrogen form, separate out with the small particle of Al N, can play precipitation strength.
Nitrogen of the present invention (N) content 0.01 ~ 0.03%, in the time of 590 ℃, the solubleness maximum of nitrogen in ferrite is about 0.1%, and in room temperature with slightly under high-temperature, nitrogen is gradually with Fe subsequently
4The N form is separated out, and the intensity of steel, hardness is improved, plasticity, toughness drop.In addition, molten steel [N] raises, and has aggravated separating out of vanadium nitride, aluminium nitride.
The present invention compared with prior art, is that sectional dimension is 300 х 400mm owing to adopting continuous casting blooms, and open rolling becomes little square billet, then send the technique of high speed wire rolling, thereby obtain, makes the bridge rope even by metallographic structure and the performance of steel cable wire rod, and crystal grain obtains better refinement; In the high speed wire rolling process, due to the quick process for cooling that has adopted controlled rolling temperature, Wind Volume, thereby making the tensile strength >=2000MPa of steel wire and stable for final bridge rope, the torsion value reaches >=and 15 times, in the cold drawing process, there is no invar yarn quality problem and produce the fracture of wire phenomenon.
The accompanying drawing explanation
The metallographic structure figure that Fig. 1 is bridge rope steel wire rod of the present invention
The pearlitic lamella figure that Fig. 2 is bridge rope steel wire rod of the present invention.
Embodiment
Below the present invention is described in detail:
The value list that table 1 is various embodiments of the present invention;
The main technologic parameters list that table 2 is various embodiments of the present invention;
Table 3 is the list of various embodiments of the present invention performance monitoring situation.
Various embodiments of the present invention are according to following steps production:
Its step:
1) smelt also continuous casting and become base, the cross dimensions of controlling strand is at least 300 х 400mm; Control the tundish superheating temperature and be no more than 20 ℃; Control casting speed at 0.3～0.6m/min; The section draft of controlling after strand is gently depressed is not more than 8.0%;
2) strand is heated, controlled soaking temperature at 1250～1500 ℃, control time inside furnace and be not less than 300min;
3) be rolled, control start rolling temperature and be not less than 1200 ℃; Open rolling becomes cross dimensions to be not more than the square billet of 250 * 250mm;
4) again heat, control soaking temperature not higher than 1050 ℃, soaking time 100～200 min;
5) carry out high-speed rolling, control the roughing start rolling temperature at 900～980 ℃, control the finish rolling start rolling temperature not higher than 850 ℃;
6) weaved silk, control laying temperature and be not less than 920 ℃;
7) air-cooled to room temperature, control air-cooled line roller table speed extreme difference 1.05～1.12, control speed of cooling at 5～15 ℃/S;
8) stand-by.
The chemical composition wt% of table 1 each embodiment of steel of the present invention
| Composition | C | Si | Mn | P | S | Cr | Al | N | V | Cu |
| 1 | 0.95 | 0.16 | 0.8 | 0.014 | 0.012 | 0.1 | 0.098 | 0.019 | 0.05 | 0.03 |
| 2 | 0.975 | 0.1 | 0.9 | 0.011 | 0.010 | 0.2 | 0.148 | 0.023 | 0.02 | 0.02 |
| 3 | 0.99 | 0.27 | 0.6 | 0.008 | 0.005 | 0.3 | 0.13 | 0.021 | 0.04 | 0.015 |
| 4 | 1.1 | 0.38 | 0.75 | 0.017 | 0.006 | 0.4 | 0.072 | 0.015 | 0.03 | 0.017 |
| 5 | 1.2 | 0.48 | 1.0 | 0.010 | 0.008 | 0.5 | 0.05 | 0.013 | 0.01 | 0.021 |
The main technologic parameters list (one) of table 2 each embodiment of steel of the present invention
The main technologic parameters list (two) of table 2 each embodiment of steel of the present invention
The test-results of table 3 each embodiment of steel of the present invention
As can be seen from Table 3, more than the tensile strength of the finished product steel wire of the present invention reaches 2000MPa, the torsion value of steel wire can reach more than 15 times, and it is the requirement of energy satisfying the market fully.
Above-described embodiment only exemplifies for the best, and is not the restriction to embodiments of the present invention.
Claims (2)
1. the bridge cable wire rod of tensile strength >=2000MPa, its component and weight percent content are: C:0.95～1.2%, Si:0.1%～0.48%, Mn:0.6～1.0%, Cr:0.1～0.5%, V:0.01～0.05%, Cu≤0.05%, Al:0.05～0.15%, N:0.01～0.03%, P≤0.025%, S≤0.015%, surplus is Fe and inevitable impurity.
2. produce the method for the bridge cable of tensile strength >=2000MPa claimed in claim 1 with wire rod, its step:
1) smelt also continuous casting and become base, the cross dimensions of controlling strand is at least 300 х 400mm; Control the tundish superheating temperature and be no more than 20 ℃; Control casting speed at 0.3～0.6m/min; The section draft of controlling after strand is gently depressed is not more than 8.0%;
2) strand is heated, controlled soaking temperature at 1250～1500 ℃, control time inside furnace and be not less than 300min;
3) be rolled, control start rolling temperature and be not less than 1200 ℃; Open rolling becomes cross dimensions to be not more than the square billet of 250 * 250mm;
4) again heat, control soaking temperature not higher than 1050 ℃, soaking time 100～200 min;
5) carry out high-speed rolling, control the roughing start rolling temperature at 900～980 ℃, control the finish rolling start rolling temperature not higher than 850 ℃;
6) weaved silk, control laying temperature and be not less than 920 ℃;
7) air-cooled to room temperature, control air-cooled line roller table speed extreme difference 1.05～1.12, control speed of cooling at 5～15 ℃/S;
8) stand-by.
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| CN201210473122.3A CN102936688B (en) | 2012-11-21 | 2012-11-21 | Wire with tensile strength>=2000MPa for bridge cable and production method |
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| CN201210473122.3A CN102936688B (en) | 2012-11-21 | 2012-11-21 | Wire with tensile strength>=2000MPa for bridge cable and production method |
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| CN102936688B CN102936688B (en) | 2014-11-19 |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105112807A (en) * | 2015-10-08 | 2015-12-02 | 武汉钢铁(集团)公司 | High-strength bridge cable steel with pearlite inter-lamellar spacing smaller than 150nm and production method |
| CN105624564A (en) * | 2016-01-05 | 2016-06-01 | 江阴兴澄特种钢铁有限公司 | High-carbon steel wire with good fine steel cord drawing machining performance and manufacturing method of high-carbon steel wire |
| CN107227427A (en) * | 2017-07-28 | 2017-10-03 | 武汉钢铁有限公司 | 7.0mm2000MPa grades of zinc-coated wires of Φ and its manufacture method |
| CN107354380A (en) * | 2017-08-30 | 2017-11-17 | 武汉钢铁有限公司 | A kind of tensile strength >=2300MPa bridge cables steel and production method |
| CN107587071A (en) * | 2017-08-30 | 2018-01-16 | 武汉钢铁有限公司 | A kind of tensile strength >=2100MPa bridge cables steel and production method |
| CN109174997A (en) * | 2018-08-14 | 2019-01-11 | 武汉钢铁有限公司 | A kind of production method that can improve Rm >=1860MPa bridge cable coating wire |
| CN109468530A (en) * | 2018-10-17 | 2019-03-15 | 江阴兴澄合金材料有限公司 | 2000MPa grades or more bridge cable zinc-coated wire gren rod and production method |
| CN110184537A (en) * | 2019-05-24 | 2019-08-30 | 武汉钢铁有限公司 | A kind of low-carbon high intensity containing cobalt bridge Suo Gang and production method |
| CN112090956A (en) * | 2020-09-01 | 2020-12-18 | 武汉钢铁有限公司 | Production control method of wire rod for low-segregation high-torsion bridge cable |
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| 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 |
| CN105112807A (en) * | 2015-10-08 | 2015-12-02 | 武汉钢铁(集团)公司 | High-strength bridge cable steel with pearlite inter-lamellar spacing smaller than 150nm and production method |
| CN105624564A (en) * | 2016-01-05 | 2016-06-01 | 江阴兴澄特种钢铁有限公司 | High-carbon steel wire with good fine steel cord drawing machining performance and manufacturing method of high-carbon steel wire |
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| CN107227427A (en) * | 2017-07-28 | 2017-10-03 | 武汉钢铁有限公司 | 7.0mm2000MPa grades of zinc-coated wires of Φ and its manufacture method |
| CN107227427B (en) * | 2017-07-28 | 2019-03-15 | 武汉钢铁有限公司 | 7.0mm2000MPa grades of zinc-coated wires of Φ and its manufacturing method |
| CN107587071B (en) * | 2017-08-30 | 2019-05-24 | 武汉钢铁有限公司 | A kind of tensile strength >=2100MPa bridge cable steel and production method |
| CN107354380A (en) * | 2017-08-30 | 2017-11-17 | 武汉钢铁有限公司 | A kind of tensile strength >=2300MPa bridge cables steel and production method |
| CN107587071A (en) * | 2017-08-30 | 2018-01-16 | 武汉钢铁有限公司 | A kind of tensile strength >=2100MPa bridge cables steel and production method |
| CN107354380B (en) * | 2017-08-30 | 2019-04-09 | 武汉钢铁有限公司 | A kind of tensile strength >=2300MPa bridge cable steel and production method |
| CN109174997A (en) * | 2018-08-14 | 2019-01-11 | 武汉钢铁有限公司 | A kind of production method that can improve Rm >=1860MPa bridge cable coating wire |
| CN109468530A (en) * | 2018-10-17 | 2019-03-15 | 江阴兴澄合金材料有限公司 | 2000MPa grades or more bridge cable zinc-coated wire gren rod and production method |
| CN109468530B (en) * | 2018-10-17 | 2021-04-06 | 江阴兴澄合金材料有限公司 | Hot-rolled wire rod for galvanized steel wire of bridge cable rope with over 2000MPa level and production method |
| CN110184537A (en) * | 2019-05-24 | 2019-08-30 | 武汉钢铁有限公司 | A kind of low-carbon high intensity containing cobalt bridge Suo Gang and production method |
| CN110184537B (en) * | 2019-05-24 | 2020-10-30 | 武汉钢铁有限公司 | Low-carbon cobalt-containing high-strength bridge cable steel and production method thereof |
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| CN114734009A (en) * | 2022-03-23 | 2022-07-12 | 江阴兴澄合金材料有限公司 | Steel wire for ultrahigh-strength card clothing and manufacturing method thereof |
| CN114734009B (en) * | 2022-03-23 | 2024-04-02 | 江阴兴澄合金材料有限公司 | Steel wire rod for ultrahigh-strength card clothing and manufacturing method thereof |
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