CN101311288B - Wire rod for producting1770Mpa bridge cable galvanized steel wire and method for manufacturing same - Google Patents
Wire rod for producting1770Mpa bridge cable galvanized steel wire and method for manufacturing same Download PDFInfo
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Abstract
The invention provides a wire rod for a galvanized steel wire of a 1770MPa bridge stay cable comprising the following chemical elements (by wt percentage): C, 0.85 to 0.9; Si, 0.12 to 0.32; Mn, 0.6 to0.9; P, less than or equal to 0.025; S, less than or equal to 0.025; Cr, 0.1 to 0.25; V, less than or equal to 0.06; Cu, less than or equal to 0.1; the rest, inevitable impurity elements. The invention also provides a manufacturing method of the wire rod. The wire rod provided by the invention has the tensile strength Rm of 1300 to 1400 MPa, the elongation after fracture A which is more than or equal to 8 percent, and the contraction of area Z which is more than or equal to 30 percent (after aging, the contraction of area is more than or equal to 35 percent). The galvanized steel wire made ofthe wire rod can completely meet the technical requirements of the galvanized steel wire of the 1770MPa bridge stay cable, such as fatigue tests of high dynamic load (more than or equal to two million cycle-index), high toughness and high torsion (more than or equal to eleven times), etc.
Description
Technical field
The invention belongs to field of welding material, more specifically, the present invention relates to the bridge cable galvanized steel wire.
Background technology
Suspension bridge and drag-line bridge are the important structure formation of modern long span bridge beam, when particularly setting up the especially big bridge of striding the footpath greatly in the place of crossing over difficult build bridge piers such as valley, bay, great river, great river, often all select the bridge type of suspension bridge and cable-stayed bridge.
Suspension bridge is made up of suspension cable, pylon, anchor ingot, suspension rod, stiff girder and bridge floor, and the bridge floor load is passed to suspension cable through stiff girder, suspension rod, is reached the anchor ingot at pylon and two ends again by suspension cable.Cable-stayed bridge is made up of drag-line, Sarasota, girder and bridge floor, and the bridge floor load is passed to drag-line, passed to Sarasota by drag-line again through girder.
The stress system of suspension bridge and cable-stayed bridge mainly comprises: 1. deck system; 2. support the funicular system of deck system; 3. the bridge tower of supporting rope system; 4. for suspension bridge, comprise that also the anchor of fixed cable system splits.
Bridge stay cable (suspension cable) galvanized steel wire in the funicular system of supporting deck system is the crucial load-supporting part of whole bridge, must possess high strength, high dynamic load fatigue lifetime (〉=200 ten thousand cycle), high tenacity, high twisting property (〉=11 times), reach above-mentioned requirements, wire rod must satisfy following some: the first, wire rod composition design must be rationally; The second, the wire rod composition is wanted evenly; The 3rd, inclusion rank (content) is low as far as possible; The 4th, strict control S, P, H, O, N content and residual element; The 5th, it is high that wire rod sorbite content is wanted; The 6th, the decarburized layer deepness of strict control wire rod.
Φ 7.0mm 1770Mpa level bridge stay cable galvanized steel wire wire rod, state external enwergy are produced and the country that is used for case history has only Japan, and in China, the production of this type of wire rod still be blank.
By retrieving domestic and international patent database, be used for the bridge cable galvanized steel wire and mainly contain following several, as shown in table 1 with the chemical element of material:
Table 1: main chemical elements (wt%)
In China's domestic bridge construction competitive bidding process, the main main chemical elements such as the table 2 of Japanese Nippon Steel wire rod:
Table 2: Japanese Nippon Steel bridge stay cable (suspension cable) galvanized steel wire wire rod main chemical elements (wt%)
The present inventor is to the Chemical Composition of the high silicone disc bar of Japanese Nippon Steel high-carbon, especially the effect in steel is analyzed to alloying element.Because silicon is non-carbide forming element, mainly be dissolved in ferrite and form the alloy ferrite and reach enhancement purpose, but the greying of silicon tendency is bigger, promotes cementite to form graphite carbon and makes the toughness plasticity and the decrease of fatigue strength of steel, 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.With regard to alloy spring steel, American and Britain, method, moral, day and ISO, its high carbon content is 0.55～0.65%, is equivalent to Chinese 60Si2MnA, Japanese JIS G4801 " Spring steel " SUP7.Simultaneously, the silicone content height rolls cooling control technology control difficulty height to high line traffic control, causes wire rod inside to have harmful tissues such as martensite easily.Steel grade as the bridge cable galvanized steel wire is selected for use, should be comparatively safe with the sophisticated mark steel grade of receiving, surpassed the category that " microalloying " adds for siliceous 1.2%.
For can be under the prerequisite of guaranteeing galvanized steel wire tensile strength, guarantee high dynamic load fatigue lifetime (〉=200 ten thousand cycle), high tenacity, the high twisting property (〉=11 times) of galvanized steel wire, and reduce cost, the present inventor adopts micro-alloying technology, by to the function analysis of each alloying element in steel, and improved manufacturing process, thereby finished the present invention.
Therefore, first purpose of the present invention is to provide a kind of 1770MPa level bridge cable galvanized steel wire wire rod.
Second purpose of the present invention is to provide the manufacture method of this 1770MPa level bridge cable galvanized steel wire with wire rod.
Summary of the invention
A kind of 1770MPa level bridge stay cable galvanized steel wire wire rod, it is characterized in that, comprise following chemical element (wt%): C:0.85-0.9, Si:0.12-0.32, Mn:0.6-0.9, P≤0.012, S≤0.002, Cr:0.1-0.25, V≤0.06, Cu≤0.05, all the other are the unavoidable impurities element; The metallographic structure of described wire rod is based on sorbite, sorbite content 〉=90%; The described wire rod degree of depth of total decarburized layer on one side is not more than 0.07mm.
Each alloying element content and effect thereof: the chemical element in the steel is the basic assurance of guaranteeing material mechanical performance.The present invention is by adding the green strength that trace alloying element Cr, V improve wire rod.
Chromium is the strong carbide forming element, and it is the displacement intravital iron atom of carburizing and form alloyed cementite (Fe.Cr) 3C basically.Strengthened the avidity of Fe and C, thereby improved austenitic stability, grain growth when stoping hot rolling improves sorbitizing and forms ability.
Vanadium also is the strong carbide forming element, has close characteristic with chromium, and the interpolation content of vanadium is very little, generally all in 0.01～0.08% scope.But the avidity of itself and nitrogen is greater than aluminium.Thereby when steel-making N must strict control with Al content, control the improper aluminium nitride that can reduce the prevention grain growth, form actual coarse grain, especially the carbon content about eutectoid steel makes its toughness decline.
The homogeneity of carbon in the steel: for high carbon steel, the homogeneity of carbon in steel, homogeneity to material mechanical performance, metallographic structure is most important, therefore steel billet center carbon and center carbon segregation (steel billet center carbon/molten steel melting carbon) is done following control: steel billet center carbon :≤0.94%; Steel billet center carbon segregation (steel billet center carbon/molten steel melting carbon) ,≤1.05.
Inclusion (content) control: inclusion is one of principal element that influences steel fatigue lifetives, for this reason, requires as follows to the control of steel inclusion: press GB/T10561 standard test: A≤2.0 grade, B≤1.5 grade, C≤1.5 grade, D≤1.5 grade; Press the JISG0555 standard test: inclusion content summation≤0.1%.
Control S, P, H, O, N content and residual element: S, P, H, O, N content and residual element control to molten steel are as follows: S≤0.002%, P≤0.012%, H≤2PPm, O≤20PPm, N≤40PPm, Cu≤0.05%.
Wire rod metallographic structure: wire rod sorbite content 〉=90%, do not have cementite network and quenching structure (martensite and troostite zone).
The wire rod decarburized layer deepness: wire rod should carry out the decarburized layer deepness check, and the degree of depth of total decarburized layer (ferrite+transition layer) must not be greater than 0.07mm on one side for wire rod.
The invention provides the manufacture method of 1770MPa level bridge stay cable galvanized steel wire with wire rod, comprise smelting and casting, breaking down, high speed wire rolling, it is characterized in that, the external refining step of smelting in the step adopts ladle refining oven process and vacuum circulation degassing method to combine, wherein vacuum tightness in the vacuum circulation degassing method＜2 τ, keep more than 18 minutes, the pure degassing time is 1510 ± 10 ℃ greater than 8 minutes, finishing temperature; Body is annotated speed 〉=10 minutes, after-teeming time 〉=3 minute in the casting step; The stelmo line controlled chilling adopts Cooling Mode in the high speed wire rolling step.
In the manufacture method provided by the present invention, a kind of preferred embodiment is to annotate surplus residual steel amount 〉=5 tons in the casting step.
In the manufacture method provided by the present invention, a kind ofly preferred embodiment adopt bottom blowing Ar mode for pure in the ladle refining oven process when blowing Ar wash heat, the pure wash heat time is 〉=10 minutes, and F (O) is controlled at≤5ppm.
In the manufacture method provided by the present invention, a kind of is that 960 ± 25 ℃, reducing sizing mill group inlet temperature are that 930 ± 25 ℃, laying temperature are 930 ± 20 ℃ for finishing train inlet temperature in the high speed wire rolling step preferred embodiment.
In the manufacture method provided by the present invention, a kind of is that Φ 14-Φ 11mm, every section roller table speed are controlled to be 0.79-1.39m/s, every typhoon fan delivery is controlled to be 0-100% for stelmor roll-type supply line in the stelmo line controlled chilling adopts roller diameter preferred embodiment.
In the manufacture method provided by the present invention, a kind of preferred embodiment for smelt stay in the converter steelmaking process in the step steel operation back slag thick＜80mm, joining the carbon target behind the stove is 0.65-0.85%.
In the manufacture method provided by the present invention, a kind of preferred embodiment is that the time to be rolled is controlled in 2 hours in the breaking down step, cutting head rate 〉=15%, single ingot are cut recovery rate≤82.5% greatly greatly.
In sum, manufacturing process can adopt following flow process: desulphurised hot metal, converter, external refining, ingot steel casting, breaking down soaking, cogging, shear end to end greatly, 6VH continuous rolling 142
2, flying shear cutting to length, billet surface mechanical cleaning, the heating of high line process furnace, rolling, the high line stelmo line of high line traffic control controlled chilling, wire rod surface inspection, inspection by sampling, wire rod bundling, hang label, put in storage, dispatch from the factory.
Wherein, the processing requirement of each key step is as follows:
1. the main points in smelting and the casting step are as follows:
1) use home scrap in the factory, control Cu, Ni, Mo etc. mix the element management;
2) go into the stove molten iron and control the grade of skimming;
3) iron water amount should guarantee to annotate surplus residual steel amount 〉=4 tons; The converter temperature is smelted the benchmark operation by low [N], blows only [P]≤0.009%;
4) in converter steelmaking process for satisfying requirement to [N], [P], should accomplish following some: guarantee micro-pressure operation in the converting process; Steel operation is stayed in tapping, and slag is thick＜80mm; Join carbon behind the stove and all use low nitrogen carbon dust; Converter tapping only adds deoxidized aluminium.
6) join the carbon target behind the stove: 0.65～0.85%;
7) external refining ladle refining oven process (LF) stove processing requirements: add slag specimens such as lime, desulfurization slag, whipping agent in batches, guarantee that slag fluidity is good; In the LF operating process, should make foam slag burialing arc, prevent nitrogen pick-up; Adopt Al slag and calcareous deoxygenated agent to strengthen deoxidation, by the composition of adjusting AL near the target upper limit; Prepare at composition, temperature adjusts when carrying out the pure Ar of blowing slag Xian, suitably control is blown Ar pressure and is blown the Ar flow, is as the criterion with weak stirring, forbids that molten steel stirs to exposed, guarantees the slag deoxidation effect; Adopt bottom blowing Ar, the pure wash heat time kept about 10 minutes; Si, Mn, Cr etc. are adjustable in the target zone, join carbon and should consider electrode carburetting, and for the sake of assurance, the LF stove can be reserved several carbon and be adjusted by RH; Begin and finish to measure free F (O) at LF, the whole F of LF (O) is controlled at≤5ppm;
8) external refining vacuum circulation degassing method (RH) processing requirements: the RH tupe is this processing, and vacuum tightness＜2 τ keeps more than 18 minutes; Control C-CR add-on＜500Kg strives handling adding in early stage, last batch of C-CR add-on＜300Kg at RH; The pure degassing time was greater than 8 minutes; Carry out the whole F[O of RH] measure; The RH finishing temperature is controlled to be 1510 ℃ ± 10 ℃;
9) cast and the whole demoulding: the ingot mould cleaning is clean, forbids with new, rust and cold mould; The Φ 50mm mouth of a river is adopted in cast, and control body is annotated speed 〉=10 minutes, after-teeming time 〉=3 minute; Annotate surplus residual steel amount 〉=5 tons; Steel ingot is forbidden to put cold; The whole demoulding should be ready to Ar envelope brick, adopts when watering steel and blows the Ar protection, and control the Ar flow well, to prevent to roll up slag, is not as the criterion so that molten steel in the ingot mould is exposed.
2. the main points of breaking down step are as follows: 1) soaking pit heating; 2) time to be rolled was controlled in 2 hours; 3) guarantee that online thermal-flame cleaning drops into, and carries out the four sides cleaning; 4) guarantee big cutting head rate 〉=15%, single ingot is cut recovery rate≤82.5% greatly; 5) steel billet carries out surperficial mechanical cleaning.
3. the main points of high speed wire rolling step are as follows: 1) billet heating furnace tapping temperature: 1080 ± 25 ℃; 2) online temperature control: finishing train inlet temperature: 960 ± 25 ℃, reducing sizing mill group inlet temperature: 930 ± 25 ℃, laying temperature: 930 ± 20 ℃; 3) stelmo line controlled chilling: adopt fast cold mode, wherein stay-warm case is all opened, and roller table speed control and fan delivery are controlled following (table 3,4) respectively:
Table 3 roller table speed control (meter per second)
Table 4 fan delivery control (%)
Beneficial effect:
By to optimization of material design and design and manufacture technology, steel wire wire rod provided by the present invention, its mechanical property is as follows: tensile strength Rm:1300～1400MPa; Elongation after fracture A 〉=8%; Relative reduction in area Z 〉=30% (relative reduction in area after overaging 〉=35%).The high dynamic load fatigue test (〉=200 ten thousand cycle), high tenacity, the height that satisfy 1770Mpa level bridge stay cable galvanized steel wire with the galvanized steel wire of its production fully reverse technical requirementss (table 5) such as (〉=11 times).
Table 5 is a certain in the first in the world suspension cable bridge of building Φ 7.0mm 1770MPa level galvanized steel wire the key technical indexes
Embodiment
The present invention is further elaborated with embodiment below, but these embodiment have any restriction to the present invention absolutely not.Any change that those skilled in the art are done in to the invention process under the enlightenment of this specification sheets all will drop in the scope of claims.
Embodiment 1
Content according to chemical element shown in the table 6 carries out desulphurised hot metal, converter, external refining, ingot steel casting, carries out breaking down soaking, cogging subsequently, shears end to end greatly, 6VH continuous rolling 142
2, flying shear cutting to length, billet surface mechanical cleaning, the heating of high line process furnace, rolling, the high line stelmo line of high line traffic control controlled chilling, wire rod surface inspection, inspection by sampling, wire rod bundling, hang label, put in storage, dispatch from the factory.Carry out constituent content subsequently and measure (seeing Table 8), steel billet center carbon and center carbon segregation mensuration (seeing Table 9), Control and Inclusion Removal mensuration (seeing Table 10), sorbite content and decarburized layer deepness control mensuration (seeing Table 11).
The contained chemical element of table 6 high carbon steel (0.87%) (wt%)
Comparative example 1
According to the chemical element ratio shown in the table 7, produce by embodiment 1 described technical process.Constituent content is measured and to be seen Table 8, steel billet center carbon and center carbon segregation measure see Table 9, Control and Inclusion Removal measure see Table 10, sorbite content sees Table 11 with decarburized layer deepness control mensuration.
Table 7 chemical element (wt%)
Test result
The mensuration of table 8 chemical element content (wt%)
Table 9 steel billet center carbon and center carbon segregation
Table 10 Control and Inclusion Removal
Table 11 sorbite content and decarburized layer deepness control
Industrial applicibility
The Φ 7.0mm 1770MPa level zinc-coated wire of manufacturing experimently by certain metallic article Co., Ltd with material of the present invention, and entrust certain cable Co., Ltd to weave into Φ 7.0mm * 37 test strands, passed through dynamic load fatigue and the static test of quality technical supervision inspection point, Jiangsu Province 2,000,000 cycles. Φ 7.0mm * 223 test strands have also passed through static test. Prove technical specification and the designing requirement of satisfying suspension cable with the high-tensile steel wires of material development of the present invention fully, created condition for material of the present invention is applied to Bridge Project.
The Φ 7.0mm 1770MPa level zinc-coated wire of making by a certain metallic article Co., Ltd with material of the present invention, be successfully applied to China at a certain suspension cable bridge of the rank the first in the world of building (the strength of galvanized wire rank is the highest, span is maximum), filled up China and produced blank.
Claims (8)
1. 1770MPa level bridge stay cable galvanized steel wire wire rod, it is characterized in that, comprise following chemical element (wt%): C:0.85-0.9, Si:0.12-0.32, Mn:0.6-0.9, P≤0.012, S≤0.002, Cr:0.1-0.25, V≤0.06, Cu≤0.05, all the other are the unavoidable impurities element;
Steel billet center carbon and center carbon segregation are done following control: steel billet center carbon :≤0.94%; Steel billet center carbon segregation :≤1.05; The control of inclusion requires as follows: press GB/T10561 standard test: A≤2.0 grade, B≤1.5 grade, C≤1.5 grade, D≤1.5 grade; Press the JISG0555 standard test: inclusion content summation≤0.1%; S, P, H, O, N content and residual element control to molten steel are as follows: S≤0.002%, P≤0.012%, H≤2PPm, O≤20PPm, N≤40PPm, Cu≤0.05%;
The metallographic structure of described wire rod is based on sorbite, sorbite content 〉=90%, and cementite network and quenching structure do not have; The described wire rod degree of depth of total decarburized layer on one side is not more than 0.07mm.
2. the described 1770MPa level of claim 1 bridge stay cable galvanized steel wire is with the manufacture method of wire rod, comprise smelting and casting, breaking down, high speed wire rolling, it is characterized in that, the external refining step of smelting in the step adopts ladle refining oven process and vacuum circulation degassing method to combine, wherein vacuum tightness in the vacuum circulation degassing method＜2 τ, keep more than 18 minutes, the pure degassing time is 1510 ± 10 ℃ greater than 8 minutes, finishing temperature; Body is annotated speed 〉=10 minutes, after-teeming time 〉=3 minute in the casting step; The stelmo line controlled chilling adopts Cooling Mode in the high speed wire rolling step.
3. manufacture method as claimed in claim 2, the surplus residual steel amount of notes in the wherein said casting step 〉=5 tons.
4. manufacture method as claimed in claim 2, the pure bottom blowing Ar mode that adopts when blowing Ar wash heat in the wherein said ladle refining oven process, the pure wash heat time is 〉=10 minutes, F (O) is controlled at≤5ppm.
5. manufacture method as claimed in claim 2, the finishing train inlet temperature is that 960 ± 25 ℃, reducing sizing mill group inlet temperature are that 930 ± 25 ℃, laying temperature are 930 ± 20 ℃ in the wherein said high speed wire rolling step.
6. manufacture method as claimed in claim 2, to adopt roller diameter be that Φ 14-Φ 11mm, every section roller table speed are controlled to be 0.79-1.39m/s, every typhoon fan delivery is controlled to be 0-100% to stelmor roll-type supply line in the wherein said stelmo line controlled chilling.
7. manufacture method as claimed in claim 2, stay in the converter steelmaking process in the wherein said smelting step steel operation back slag thick＜80mm, joining the carbon target behind the stove is 0.65-0.85%.
8. manufacture method as claimed in claim 2, the time to be rolled is controlled in 2 hours in the wherein said breaking down step, cutting head rate 〉=15%, single ingot are cut recovery rate≤82.5% greatly greatly.
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