CN107354380A - A kind of tensile strength >=2300MPa bridge cables steel and production method - Google Patents
A kind of tensile strength >=2300MPa bridge cables steel and production method Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
- C21D8/065—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires of ferrous alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
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Abstract
A kind of tensile strength >=2300MPa bridge cable steel, its chemical composition and content are：C：0.92~0.94 wt%, Si：0.7~1.0 wt %, Mn：Wt % of wt % of 0.45~0.55 wt %, P≤0.01, S≤0.01, Cr：0.07~0.09 wt %, V：0.16~0.20wt %, Al：0.16~0.20 wt %, N：0.005~0.008 wt %, B：0.001~0.0015 wt %, Zr：0.002~0.005 wt %.Production method：Molten iron pre-processes；Converter smelting；RH application of vacuum；It is casting continuously to form base；The longitudinally cutting strand of flame is used after indoor stacking slow cooling；To heating strand；Open rolling is into small billet；Heated after stacking slow cooling；High-speed rolling；Spinning；It is air-cooled to room temperature.Present invention intensity after drawing, zinc-plated, stabilization processes reaches more than 2300MPa, while meets that number of torsions is not less than 16 times, can meet that bridge span is more than 1000m large bridge construction demand.
Description
Technical field
The present invention relates to wire rod and its production method, belongs to bridge cable wire rod and its production method, more particularly to one
Kind tensile strength >=2300MPa bridge cables wire rod and production method.
Background technology
Bridge is the key node engineering of infrastructure, builds that difficulty is big, engine request is high, represent a country or even
One epoch, the highest level of engineering-built, design and manufacture and developing material.Modern Bridge Design science, reasonable, abundant profit
With the tensile property of steel and the compressive property of concrete, whole bridge floor is sling by bridge cable.
Important supporting part of the bridge cable as modern bridge, its performance directly determine bridge safty, span and
Engineering-built feasibility, such as busy navigation channel or the severe region of geological environment, it is desirable to reduce as far as possible to come and go ship influence or
Avoid unstable bottom surface build bridge pier, it is therefore desirable to increase the span between bridge, this require bridge cable have compared with
High intensity simultaneously mitigates own wt, to support bigger weight.
It is born so far from the bridge of seat of honour modern times in 1883, the intensity of bridge cable steel wire undergoes from initial 1200MPa
1570MPa, 1670MPa, 1770MPa are stepped up to the 1860MPa of current main flow, and highest ranking bridge rope steel wire application at present
For the Ulsan, Korea bridge being open to the traffic in 2014, its intensity of steel wire reached 1960MPa.
Data are shown, as the cable steel wire of modern bridge " lifeline ", its intensity often improves 10%, then cable accordingly subtracts
Weigh more than 10%.The raising of the strength of materials can strengthen the span ability of main push-towing rope, can then reduce cable body across the timing of distance one
Based material dosage and the safety coefficient for improving main push-towing rope.Therefore, with the development of economic society and bridge construction environment increasingly
Harshness, increasing across river, bridge spanning the sea, bridge cable develops into inevitable trend to higher intensity.
Bridge cable with steel wire be by high-carbon gren rod, by drawing, it is zinc-plated after made of, its performance depends on mother metal
(bridge cable is gren rod with steel) quality condition.At present, it is to increase with the way of intensity of steel wire main flow to improve bridge cable
Carbon content in steel, such as the corresponding steel wire of 82B (carbon content 0.82%) corresponding intensity of steel wire 1770MPa, 87Mn (carbon content 0.87%)
Intensity 1860Mpa.But with the continuous improvement of intensity of steel wire, carbon content increasingly increases in mother metal, causes high intensity bridge cable
It is more difficult with the exploitation of steel.
This is because, the index of evaluation cable steel wire properties does not only have intensity, the requirement also reversed.Twisting property can be with
Compare science, the toughness of comprehensive evaluation material, and this is directly connected to the security of bridge.And with the increase of carbon content,
The controls such as segregation, tissue are further difficult, and smelting, rolling mill practice window are narrow, intensity of steel wire increase, fragility increase, steel wire torsion
Performance drastically reduces.Intensity and torsion often check and balance：Lift intensity, reverse reduction；Intensity is reduced, reverses and rises.At present,
Lower strength wire gren rod, has and sets foot in compared with multiple enterprises, and high-tensile steel wires gren rod, turns into iron and steel enterprise's production
" minefield ", also turn into the mark post product for weighing enterprise technology strength.
Existing patented technology, mainly for the production of below 2000MPa zinc-coated wire gren rods：Publication number
CN102181786A is related to a kind of 1670MPa levels bridge cable zinc-coated wire wire rod and preparation method thereof；Publication number
CN101311288A is related to a kind of 1770MPa levels bridge stay cable zinc-coated wire wire rod and its manufacture method；Publication number
CN102634730A is related to a kind of 1860MPa levels bridge cable zinc-coated wire wire rod and its manufacture method；Publication number
CN105671443A is related to a kind of 1960MPa levels cable zinc-coated wire gren rod and production method；Four kinds of method lifes of the above
Intensity of steel wire is respectively less than 2000MPa after the wire rod drawing of production, in the world the engineer applied of existing related or similar performance products,
Belong to routine or improved products.
China Patent Publication No. is CN102936688A document, is related to a kind of tensile strength >=2000MPa bridge cable
Rope wire rod and production method, the patent steel wire actual strength is respectively less than 2100MPa, and C content is up to 0.95~1.2%, compared with
The C of high content ensure that intensity of steel wire, if but production difficulty is big and production control is improper, it is usually associated with torsion value significantly
Fluctuation, it is unfavorable for control and the bridge security of steel wire quality；Si contents are relatively low in the document simultaneously, after necessarily causing wire galvanization
Loss of strength is big and fluctuation is uncontrolled.Also, the processes such as steelmaking process converter, vacuum, refining are not described for the patent, and
It is always industry production difficult point that high-carbon steel, which homogenizes and produced, and therefore, it is difficult to ensure the steady production of the patent steel grade.
China Patent Publication No. is CN105112807 document, is related to the height that a kind of pearlite lamella is smaller than 150nm
Strong bridge Suo Gang and production method, the final intensity of steel wire of the patent are respectively less than 2100MPa, to pursue superfine piece spacing, the patent
C, Cr content are higher in component system, and carry out zerolling (785~810 DEG C of laying temperature), but too small piece spacing can be made
Troostite occurs in Cheng Gangzhong, and (pearlite divides from big to small according to piece spacing：Pearlite, sorbite, troostite), cause steel
Fragility increases, and not only production control is difficult, stability security that is poor, but also will influenceing bridge.It is different from the patent thinking,
This patent uses relatively low carbon content (0.92~0.94%), in favor of the control being segregated in industrial production, beneficial to steel wire torsion
The stability contorting of value；Meanwhile intergranular adhesion is weakened to avoid Cr from forming carbide in intergranular, this patent is contained using relatively low Cr
Amount, and B is added to improve quenching degree；To ensure intensity, this patent has been abandoned the thinking for pursuing pearlite piece spacing simply, passed through
Appropriate V is added in high-carbon steel, and coordinates technology, realizes crystal grain thinning, can synchronously realize the raising of intensity and plasticity；
In addition, to improve purity of steel, this patent with the addition of Zr, with cleaning molten steel, remove gas inclusions, avoid the poly- of hydrogen in steel
Collection, reduces the generation of hydrogen embrittlement, and while successfully realizing intensity of steel wire more than 2300MPa, torsion value is more than 16 times.
It is with the increasingly harshness of closing on for 2000MPa levels zinc-coated wire engineering application, and bridge construction environment, i.e., easy
Gradually decreased in the position for building bridge, the research and development of greater degree bridge rope steel are then more aobvious increasingly urgent.
To meet the engine request improved constantly, the present invention realizes intensity and toughness by the innovation of composition and technique
Good fit, wire rod intensity after drawing, zinc-plated, stabilization processes up to more than 2300MPa, while meets that torsional stabilizer exists
More than 16 times.
The content of the invention
Bridge rope intensity of steel wire is higher, and bridge span is bigger, more adapt to it is over strait, across river, severe across natural conditions such as valleys
Or the requirement to the strict regional bridge construction of ecological protection requirement.Data show, bridge rope intensity of steel wire often improves 10%, same
The bridge rope steel using amount of seat bridge can be to reduce 10%；If bridge steel plate amount is identical, intensity of steel wire often improves 10%, and bridge span is just
More than 12% can be increased；If bridge steel plate amount and span determine that intensity of steel wire often improves 10%, and bridge security surplus carries accordingly
It is high by more than 8%.But the index of steel wire properties is weighed, except the twisting property of intensity of steel wire, also steel wire.Distortional energy concentrated expression
The matching of intensity of steel wire and toughness, its numerical value directly reflect the combination property of steel wire, directly affect bridge security and can
By property, therefore as intensity level, twisting property is also the Key Performance Indicator of steel wire.
But inevitably, the lifting of intensity along with torsion value reduction, therefore how the lifting intensity of science and
Reverse, balance relation therebetween, be emphasis and difficult point that material educational circles pays close attention to always.
The present invention completes in view of the foregoing, relatively low its object is to provide a kind of not only carbon content, and has tension
Intensity is not less than 2300MPa, bridge cable steel and its production method of the number of torsions not less than 16 times.
Realize the technical measures of above-mentioned purpose
All the time, bridge cable uses carbon steel with the steel capital, and meets cable strength enhancing by improving carbon content
Requirement.But with the rise of carbon content increasingly, the segregation getting worse of carbon in steel, experiment is found, along with the liter of carbon content
Height, intensity of steel wire can be easier to reach requirement, but steel wire can become extremely brittle, and the decline of cliff of displacement formula occurs in torsion value, has a strong impact on
The security of bridge, this turns into the key issue for restricting high intensity cable steel.Research is found, as carbon content raises, in steel
There is extremely brittle region (carbon content is 8 times of average assay) in regional area, causes the deformation of steel wire torsion process different parts to differ
Cause, " wooden pail effect " causes Steel Wire Surface defect occur, and " notch effect " causes defect constantly to extend until fracture.For this
Reason, method of the applicant by being not limited to prior art, the method for solving problem is studied.As a result find,
Pass through gross segregation control technology (clean steel smelting, big cross section continuous casting, two fiery coggings and the cold control of control of production phase each operation
The high-carbon steel such as roll to homogenize control technology), the persistent ailment of high-carbon steel segregation can be effectively improved, and then improve constantly intensity of steel wire and full
Sufficient torsional requirements.
Specifically, on the basis of high-carbon steel gross segregation is controlled, micro-alloying technology, crystal grain thinning and pearly-lustre are implemented
Body lamella, and by generating niobium carbide, segregation of the carbon in crystal boundary is reduced, the adhesion of crystal boundary is improved with this.
At present, no matter the segregation control of high-carbon steel or middle low carbon steel, the control technology for being concentrated mainly on gross segregation are ground
Hair, tackles key problems, but still do not have breakthrough for many years although experienced.Therefore, steel grade carries out grinding for microsegregation control
Hair and production practices, not to mention gross segregation and the combination of microsegregation.
At present, no matter the segregation control of high-carbon steel or middle low carbon steel, the control technology for being concentrated mainly on gross segregation are ground
Hair, tackles key problems, but still do not have breakthrough for many years although experienced.Therefore, steel grade carries out grinding for microsegregation control
Hair and production practices, not to mention gross segregation and the combination of microsegregation.
The present invention uses bloom continuous casting and low overheat control technology, improves Segregation In Casting Billet of Highcarbon Steel situation, and lead to
Cross " two fire are become a useful person " technology utilization to heat twice, roll the thermal diffusion for promoting segregation zones carbon and the rheology of metal twice, enter
One step reduces segregation；At the same time, the present invention utilizes the element V strong with carbon combining power, promotes the formation of nanoscale VC in steel,
The position of microcosmos area concentration of carbon forms VC, reduces segregations of the C in crystal boundary while crystal grain thinning, reduces the formation of net carbon
Driving force；On the other hand, the present invention uses tapping steel with high carbon, and oxidisability is weaker in steel, is equipped with B microalloyings, boron is combined with carbon
The carbide of boron is formed, equally reduces segregation of the carbon in microcosmos area.The present invention is matched somebody with somebody by what macroscopic view, microsegregation controlled
Close, efficiently solve the problem of high-carbon steel segregation control.
In tradition research, it is on main function of the vanadium in steel：1) not molten vanadium carbide nitride prevents high temperature crystal grain from growing up, and 2)
Vanadium carbide nitride prevents deformed austeaite from recrystallizing strongly.
The applicant hinders diffusion of the carbon along crystal boundary it is considered that vanadium can form relatively stable configuration with carbon, from microcosmic angle
Degree reduces the segregation of high-carbon steel；And add vanadium to raise Ar temperature, and significantly postpone pearlitic transformation, further reduce high-carbon steel
Segregation；Meanwhile with Nb ratios, the Carbonitride Precipitation temperature of vanadium is higher, and Carbon diffusion ability is more at a higher temperature, in steel
By force, therefore the Uniform Control of carbon in steel is more beneficial for, reduces degree of segregation.
The present invention is completed based on above-mentioned opinion, and its feature is as follows.
A kind of tensile strength >=2300MPa bridge cable steel, its chemical composition and percentage by weight are：C：0.92~
0.94wt%, Si：0.7~1.0wt%, Mn：0.45~0.55wt%, P≤0.01wt%, S≤0.01wt%, Cr：0.07~
0.09wt%, V：0.16~0.20wt%, Al：0.16~0.20wt%, N：0.005~0.008wt%, B：0.001~
0.0015wt%, Zr：0.002~0.005wt%, remaining is Fe and inevitable impurity.
Preferably Si percentage by weights are 0.7~0.83%.
Preferably V percentage by weights are 0.16~0.193%.
Preferably Al percentage by weights are 0.165~0.19%.
Preferably B percentage by weights are 0.001~0.0013%.
Preferably Zr percentage by weights are 0.002~0.0045%.
The method for producing a kind of tensile strength >=2300MPa bridge cable steel, its step：
1) molten iron pretreatment is carried out, and P, S content are respectively in molten iron before controlling into converter：P ＜ 0.015wt%, S ＜
0.01wt%；
2) carbon content is not less than 0.8wt% when carrying out converter smelting, and controlling converter tapping, and routinely carries out deoxygenated alloy
Change；
3) RH application of vacuum is carried out, and the control process time is not less than 10 cycle periods；Into after tundish, in control
Between wrap in molten steel overheat be no more than 20 DEG C；
4) base is casting continuously to form, and controls Cross Section of CC Billet size 260mm × 360mm~320mm × 420mm, casting speed is steady
Control calmly in 0.50~0.75m/min；And use solidification end dynamic soft-reduction technique, strand total reduction 3~5%；
5) strand is heated, for control soaking temperature at 1210~1240 DEG C, time inside furnace is 300~340min；
6) open rolling is into small billet, and controls its cross dimensions no more than 160 × 160mm；
7) slow cooling is carried out, small billet after the indoor stacking slow cooling not less than 48h, is being heated to small billet, controlling it
Soaking temperature is at 1115~1145 DEG C, and soaking time is in 100~140min；
8) high-speed rolling is carried out, control roughing total reduction is not less than 40%, is rolled into disk of the diameter in 11mm~16mm
Bar；
9) spun, and control laying temperature to be not less than 925 DEG C；
10) it is air-cooled to room temperature, and cooling velocity control is in 10~15 DEG C/s；It is stand-by.
Molten steel overheat is no more than 18 DEG C preferably in tundish.
Preferably small billet soaking temperature is at 1120~1140 DEG C.
The mechanism and effect of each element and main technique in the present invention
The production technology in the present invention is illustrated first：
For bridge cable steel, molten iron pretreatment is to reduce P, S critical process, and P can cause cold short, and this is to high-carbon
Endangered for the follow-up cold drawing of steel seriously, control is more low better；S can cause hot-short, and steel wire following process process, too high S contains
Amount, by the intensity of steel wire after influence galvanizing, therefore same control is more low better.But consider production cost and steel is pure
Degree, therefore control：P ＜ 0.01%, S ＜ 0.01%.
It is fewer that converter is blown into oxygen amount, then carbon content of tapping is higher, and then steel oxidisability reduces, yield of alloy rise,
Purity of steel is lifted.Therefore, purity of steel control is advantageous to using tapping steel with high carbon, and then beneficial to metallurgical indexs such as field trashes
Improvement.But smelting process major part P, converter oxidation removal is depended on, thus lance be present with tapping carbon content in P control
Shield is, it is necessary to be uniformly coordinated.In view of 0.01% after molten iron pretreatment of the present invention, the P that returns of refining process, the preferential tapping of the present invention are considered
Carbon content is higher than 0.8wt%.
Hydrogen can cause hydrogen embrittlement to cause steel wire to be broken suddenly, therefore high-carbon steel is needed by RH application of vacuum, to remove in steel
Gas, meanwhile, be advantageous to the uniform of high-carbon composition of steel.And in steel hydrogen removal effect, dependent on RH disposal abilities, when treated
Between when being less than 10 cycle periods, hydrogen still could possibly be higher than 5ppm in steel.Therefore, the present invention preferably RH application of vacuum time should height
In 10 cycle periods.
Strand is segregated the degree of superheat for depending primarily on continuous casting, and carbon easily produces macrosegregation in process of setting, therefore right
Molten steel overheat is more low better in the steel grade of more than 0.9% phosphorus content, middle bag；But the too low degree of superheat can cause " cold steel " to lead
Cause continuous casting cutout.When phosphorus content is more than 0.9%, if the degree of superheat is higher than 20 DEG C, strand segregation will be difficult to ensure that.Therefore, this hair
It is bright to use advanced tundish sensing heating, the degree of superheat can be reduced to greatest extent in the case where ensuring not stop.Therefore,
The present invention is by molten steel overheat control in tundish less than 20 DEG C.Preferably the RH vacuum drying ovens degree of superheat is no more than 18 DEG C.
The strand of big cross section size has more excellent flow field, can mitigate the segregation of carbon；And follow-up " two fire " cogging is made
Industry, it can further reduce the segregation situation become a useful person.Experiment shows, using " fire " technique of becoming a useful person, anyway changes technique,
Under the conditions of prior art, the equalization control of high-carbon steel can not be realized.Therefore the present invention uses " two fire are become a useful person " technique, preferably
Cross Section of CC Billet size is 260mm × 360mm~320mm × 420mm, casting speed stability contorting in 0.50~0.75m/min,
Using solidification end dynamic soft-reduction technique, strand total reduction 3~5%.
" cogging " operation is carried out to above-mentioned big cross section strand, the compression ratio of final finished material can be improved, and reduce segregation.Greatly
Section, Casting Billet of Highcarbon Steel, it is full and uniform steel, it is necessary to carry out high temperature, long-time heating.If heating-up temperature is less than 1210 DEG C,
The distribution of carbon will appear from obvious carbon-rich zone domain in steel, and when temperature is higher than 1240 DEG C, and strand decarburization is by severe overweight；Together
When, when soaking time is less than 300min, carbon has little time fully to spread, and when heated between more than 340min when, strand is same
Serious decarburization will be produced.Therefore, the present invention preferably computer heating control soaking temperature is at 1210~1240 DEG C, and time inside furnace 300~
340min, open rolling into section be small billet no more than 160 × 160mm.
To above-mentioned small billet, heated, calculated by the abundant expansion of carbon and other elements, it is uniform further to improve steel
Property.Small billet section is smaller, therefore heating-up temperature, soaking time are both needed to strictly limit.If heating-up temperature is less than 1115 DEG C, will not
Abundant expansion beneficial to element in steel is calculated；And when temperature is higher than 1145 DEG C, face the exceeded danger of decarburization；Also, when heated
Between when being less than 100min, Carbon diffusion will be insufficient, and when heated between more than 140min when, wire rod decarburization is exceeded to keep away
Exempt from.Therefore, selection process of the present invention：After slow cooling 48h, small billet is heated again, 1115~1145 DEG C of soaking temperature,
Hot 100~140min of time.Preferably small billet soaking temperature is at 1120~1140 DEG C
The cold process controlled is pricked in small billet control, crystal grain from macroscopical column crystal, equiax crystal be again tiny crystal grain through crystalline substance, when roughing amount
During less than 40%, the crystal grain of deformation can not be replied fully, cause the uneven of finished product material tissue.Stelmor produces wire rod mistake
Journey, laying temperature is particularly important, and higher laying temperature is advantageous to the uniformity controlling of wire rod composition, as laying temperature ＜ 925
DEG C when, lamella uniformity is deteriorated in steel, and reduction of area is difficult to ensure that.The above analysis, the present invention preferably roughing drafts ＞
40%, laying temperature >=925 DEG C, air-cooled to room temperature, cooling velocity control is in 10~15 DEG C/s；
Then, the composition composition as object of the present invention is illustrated：
C：Carbon is most important component in steel, and the intensity and plasticity influence on wire rod are the most notable, with carbon content
Increase drawing after intensity improve constantly.Therefore, for ensure intensity, it is necessary to more than 0.92% carbon content, but then, when
When carbon content is more than 0.94%, smelts production difficulty and increase, easily cause plasticity, torsion drastically reduces.Therefore it is both balances
Requirement, carbon content of the present invention is 0.92~0.94wt%.
Si：Silicon is intensified element important in steel, can significantly improve the elastic limit of steel wire after drawing, and can effectively be reduced
The intensity decreases caused by zinc-plated, need to maintain more than 0.7% content for this, but when more than 1.0%, too high silicon meeting
Significantly reduce plasticity, toughness.Silicone content of the present invention is 0.7~1.0wt%.Preferably Si percentage by weights are 0.7~0.83%.
Mn：Manganese is combined generation MnS with sulphur, and then mitigates the harm of sulphur, and can be refined pearlite, be improved intensity of steel wire, is
This need to keep more than 0.45%, but when content is more than 0.55%, can increase the superheated susceptivity of steel, crystal grain when making heat treatment
Easily grow up.Mn contents control of the present invention is in 0.45~0.55wt%.
P、S：P and ses belong to harmful element in this steel grade, and phosphorus easily produces cold short, and Sulfur capacity is also easy to produce hot-short, and then deteriorates
Steel wire drawing and heat treatment process condition, it is therefore desirable to reduce its content as far as possible.P≤0.01wt% of the present invention, S≤
0.01wt%.
Cr：Chromium can refine pearlite lamella, improve finished product intensity of steel wire, it is therefore desirable to keep more than 0.07%, but work as and contain
When amount is more than 0.09%, too high chromium, wire rod quenching degree can be improved, cause course of hot rolling the abnormal structures such as martensite occur, together
When, excessively tiny lamella, wire rod toughness can be reduced, and then deteriorate the most key index-twisting property of steel wire, therefore this
Invent Cr：0.07~0.09wt%.
V：Vanadium is V-N steel element, can crystal grain thinning, raising intensity and toughness.Meanwhile in Steel Wire Heat Treatment process
In, it is avoided that austenite crystal is thick, the precipitation of its carbonitride can also play precipitation enhancement；Meanwhile vanadium carbide nitride
Generation, moreover it is possible to reduce the segregation of carbon in steel, this is particularly important for high-carbon steel.Therefore more than 0.16% need to be maintained to contain
Amount, but when more than 0.20%, too high V content, vanadium carbide nitride particle can be caused thick, and then Grain refinement is lost,
The existing forms of its field trash, the continuity of steel matrix will be also destroyed, and then deteriorate steel combination property.Therefore, V of the present invention：
0.16~0.20wt%.Preferably V percentage by weights are 0.16~0.193%.
Al：Aluminium is most efficient deoxidier, can effectively improve Molten Steel Cleanliness.Meanwhile AlN particles can play crystal grain thinning
And precipitation enhancement, therefore more than 0.16% content need to be maintained, but when more than more than 0.20%, too high Al can deteriorate
Steel mechanics performance, therefore Al of the present invention：0.16~0.20wt%.Preferably Al percentage by weights are 0.165~0.19%.
N：Nitrogen is the important composition element of vanadium micro-alloying, and a certain amount of nitrogen can also strengthen steel strength, therefore need to maintain
More than 0.005%, but when more than more than 0.008%, too high nitrogen content can significantly reduce steel toughness and twisting property,
Therefore N of the present invention：0.005~0.008wt%.
B：Boron can significantly improve steel wire quenching degree, meanwhile, research shows, micro B can effectively lower P, S and exist in high-carbon steel
The segregation of crystal boundary, and improve oxide inclusion form, therefore more than 0.001% content need to be maintained, but when more than 0.0015%,
Too high B can form boron phase in crystal boundary, and then reduce the adhesion of crystal boundary.Therefore B of the present invention：0.001~0.0015wt%.It is excellent
Selection of land B percentage by weights are 0.001~0.0013%.
Zr：Zirconium can play the effect of degassing and crystal grain thinning, therefore need to maintain more than 0.002% content, but work as and exceed
When 0.005%, too high zirconium content, which can increase, smelts difficulty and production cost, and causes spot segregation, deteriorates steel performance, because
This Zr of the present invention：0.002~0.005wt%.Preferably Zr percentage by weights are 0.002~0.0045%.
Compared with prior art, tensile strength reaches more than 2300MPa to the present invention after drawing, zinc-plated, stabilization processes,
Meet that number of torsions is not less than 16 times simultaneously, can meet that bridge span is more than 1000m large bridge construction demand.
Embodiment
It should be noted that following embodiment is used to illustrate the present invention, but the present invention does not limit to following examples.
Table 1 is the chemical composition value of various embodiments of the present invention and comparative example；
Table 2 is various embodiments of the present invention and comparative example smelting process technological parameter；
Table 3 is various embodiments of the present invention and comparative example Technological Parameters of Rolling Process；
Table 4 is various embodiments of the present invention and comparative example test effect.
Various embodiments of the present invention, produced according to following steps：
1) molten iron pretreatment is carried out, and P, S content are respectively in molten iron before controlling into converter：P ＜ 0.015wt%, S ＜
0.01wt%；
2) carbon content is not less than 0.8wt% when carrying out converter smelting, and controlling converter tapping, and routinely carries out deoxygenated alloy
Change；
3) RH application of vacuum is carried out, and the control process time is not less than 10 cycle periods；Into after tundish, in control
Between wrap in molten steel overheat be no more than 20 DEG C；
4) base is casting continuously to form, and controls Cross Section of CC Billet size 260mm × 360mm~320mm × 420mm, casting speed is steady
Control calmly in 0.50~0.75m/min；And use solidification end dynamic soft-reduction technique, strand total reduction 3~5%；
5) strand is heated, for control soaking temperature at 1210~1240 DEG C, time inside furnace is 300~340min；
6) open rolling is into small billet, and controls its cross dimensions no more than 160 × 160mm；
7) slow cooling is carried out, small billet after the indoor stacking slow cooling not less than 48h, is being heated to small billet, controlling it
Soaking temperature is at 1115~1145 DEG C, and soaking time is in 100~140min；
8) high-speed rolling is carried out, control roughing total reduction is not less than 40%, is rolled into disk of the diameter in 11mm~16mm
Bar；
9) spun, and control laying temperature to be not less than 925 DEG C；
10) it is air-cooled to room temperature, and cooling velocity control is in 10~15 DEG C/s；It is stand-by.
The chemical composition value wt% of the various embodiments of the present invention of table 1 and comparative example
The various embodiments of the present invention of table 2 and comparative example smelting process technological parameter
The various embodiments of the present invention of table 3 and comparative example Technological Parameters of Rolling Process
The various embodiments of the present invention of table 4 and comparative example test situation list
As known from Table 4, product quality of the present invention is stable, and finished product tensile strength of wire reaches more than 2300MPa, torsion value
To more than 16 times, span 1000m above bridge cable steel requirements have been fully met, and compared with 2200MPa level bridges Suo Gang,
Under the conditions of identical engineering design, steel consumption weight can be also reduced not less than 10%, improve production operational availability and life-cycle dimension
Cost is protected, and there is higher safety and stability.
Claims (9)
1. a kind of tensile strength >=2300MPa bridge cable steel, its chemical composition and percentage by weight are：C：0.92~0.94
wt%、Si：0.7~1.0 wt %, Mn：Wt % of wt % of 0.45~0.55 wt %, P≤0.01, S≤0.01, Cr：0.07~
0.09 wt %、V：0.16~0.20wt %, Al：0.16~0.20 wt %, N：0.005~0.008 wt %, B：0.001~
0.0015 wt %、Zr：0.002~0.005 wt %, remaining is Fe and inevitable impurity.
A kind of 2. tensile strength >=2300MPa bridge cable steel as claimed in claim 1, it is characterised in that：Si weight hundred
Divide than being 0.7~0.83%.
A kind of 3. tensile strength >=2300MPa bridge cable steel as claimed in claim 1, it is characterised in that：V weight percents
Than for 0.16~0.193%.
A kind of 4. tensile strength >=2300MPa bridge cable steel as claimed in claim 1, it is characterised in that：Al weight hundred
Divide than being 0.165~0.19%.
A kind of 5. tensile strength >=2300MPa bridge cable steel as claimed in claim 1, it is characterised in that：B weight percents
Than for 0.001~0.0013%.
A kind of 6. tensile strength >=2300MPa bridge cable steel as claimed in claim 1, it is characterised in that：Zr weight hundred
Divide than being 0.002~0.0045%.
7. a kind of method of production tensile strength >=2300MPa bridge cable steel as claimed in claim 1, its step：
1）Molten iron pretreatment is carried out, and P, S content are respectively in molten iron before controlling into converter：The wt % of P ＜ 0.015, S ＜
0.01 wt %；
2）Carbon content is not less than 0.8 wt % when carrying out converter smelting, and controlling converter tapping, and routinely carries out deoxidation alloying；
3）RH application of vacuum is carried out, and the control process time is not less than 10 cycle periods；Into after tundish, tundish is controlled
Middle molten steel overheat is no more than 20 DEG C；
4）Base is casting continuously to form, and controls Cross Section of CC Billet size 260mm × 360mm~320 mm × 420mm, casting speed is stable to be controlled
System is in 0.50~0.75m/min；And use solidification end dynamic soft-reduction technique, strand total reduction 3~5%；
5）Strand is heated, for control soaking temperature at 1210~1240 DEG C, time inside furnace is 300~340min；
6）Open rolling controls its cross dimensions no more than 160 × 160mm into small billet；
7）Slow cooling is carried out, small billet after the indoor stacking slow cooling not less than 48h, is being heated to small billet, controlling its soaking
Temperature is at 1115~1145 DEG C, and soaking time is in 100~140min；
8）High-speed rolling is carried out, control roughing total reduction is not less than 40%, is rolled into wire rod of the diameter in 11mm~16mm；
9）Spun, and control laying temperature to be not less than 925 DEG C；
10）It is air-cooled to room temperature, and cooling velocity control is in 10~15 DEG C/s；It is stand-by.
8. a kind of method of production tensile strength >=2300MPa bridge cable steel as claimed in claim 7, its feature exist
In：Molten steel overheat is no more than 18 DEG C in tundish.
9. a kind of method of production tensile strength >=2300MPa bridge cable steel as claimed in claim 7, its feature exist
In：Small billet soaking temperature is at 1120~1140 DEG C.
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