CN108239735A - High tough, permanent seal cooling bridge cable 1960MPa grades of Zn-Al Alloy Coated Steel Wires of major diameter - Google Patents
High tough, permanent seal cooling bridge cable 1960MPa grades of Zn-Al Alloy Coated Steel Wires of major diameter Download PDFInfo
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- CN108239735A CN108239735A CN201810038747.4A CN201810038747A CN108239735A CN 108239735 A CN108239735 A CN 108239735A CN 201810038747 A CN201810038747 A CN 201810038747A CN 108239735 A CN108239735 A CN 108239735A
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
- C23C2/06—Zinc or cadmium or alloys based thereon
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C1/00—Manufacture of metal sheets, metal wire, metal rods, metal tubes by drawing
- B21C1/02—Drawing metal wire or like flexible metallic material by drawing machines or apparatus in which the drawing action is effected by drums
-
- 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
-
- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/20—Ferrous alloys, e.g. steel alloys containing chromium with copper
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
- C23C2/36—Elongated material
- C23C2/38—Wires; Tubes
Abstract
The present invention relates to a kind of high tough, permanent seal cooling bridge cable 1960MPa grades of Zn-Al Alloy Coated Steel Wires of major diameter, wire rod is super clean, the hypereutectoid steel high-carbon steel wire rod that (water-bath, lead bath and salt bath) is handled by sorbitizing, tensile strength >=1290MPa, reduction of area >=30%, elongation >=10%；Wire rod is drawn into the bright steel wire of Ф 4.90mm~Ф 6.90mm, carries out hot dip zinc aluminum alloy coating, technological process later：Lead bath degreasing → hot water cleaning → chlorohydric acid pickling → hot water cleaning → weak base cleaning → hot water wash → ammonium chloride zinc chloride solvent helps plating → galvanizing by dipping nitrogen to smear examination → hot dip allumen → nitrogen and smears and wipe → take-up.Then stabilization processes are carried out to wire rod, ensures intensity, linearity, relaxation rate and the steel wire axial direction uniformity of major diameter superhigh intensity Zn95Al5 Alloy Coating Steel Wires.
Description
Technical field
The present invention relates to a kind of coating wire more particularly to the permanent seal cooling bridge cable zinc of a kind of superhigh intensity and toughness
The production method of aluminum alloy coating steel wire.
Background technology
Cable is the lifeline of bridge, is the main bearing member of Longspan Bridge, generally straight by hundreds of to tens thousand of
The steel wire that diameter is 5mm to 7mm forms.With the increase of span of bridge, the dead weight of cable unit across footpath will be in non-linear acceleration
Increase so that always dead weight also accelerates increase to cable bridge unit across footpath.Its result one is to lead to the strength of materials of cable to undertake it
The ratio increase of own wt, relatively reduced for undertaking the ratio of working load, load-carrying efficiency reduces；Second is that in current steel wire
Under intensity, need the cable sectional area of bigger, this not only with it from contradiction is reformed, also cause each construction material dosage increase,
Difficulty of construction increase, claim for eot, cost increase.Therefore, main rope of suspension bridge intensity of steel wire is improved, can not only reduce steel wire use
Amount can also mitigate main push-towing rope quality and sectional area, reduce main push-towing rope consumptive material and windage, while can reduce king-tower, anchorage structures, subtract
The volume and quality of few cable saddle, cord clip, facilitate civil engineering and erection construction, shorten the construction period, there is good economic benefit.
The main anti-corrosion measure of current Bridges in Our Country cable steel wire is steel wire surface galvanizing, and anticorrosive mechanism includes
Mechanical protection and electrochemical protection two ways.With economic further fast development, the continuous construction of crossing-fiver bridge over strait,
The service life of bridge cable is required to further improve.Especially for the bridge in area over strait, chlorine in air from
Son can accelerate to dissolve the protective film on zinc coat, therefore, it is necessary to develop a kind of better cable of durability, to meet bridge
Service life requirement.
In conclusion it needs to develop a kind of bridge cable major diameter superhigh intensity, corrosion resistant Zn95Al5 alloy layers
Steel wire solves problem above.
Invention content
The technical problems to be solved by the invention are to provide a kind of bridge cable major diameter height for the above-mentioned prior art
The production method of intensity Zn-Al Alloy Coated Steel Wire, a diameter of 5mm~7mm of finished product steel wire, the tensile strength of steel wire >=
1960MPa, yield strength >=1660MPa, endurance life：Under conditions of the stress upper limit is 980MPa, stress amplitude 460MPa,
By 2,000,000 not broken, relaxation resistances of Cyclic Stress：Relaxation rate is held at 20 ± 2 DEG C under 70% Nominal Tensile
Lotus 1000h, relaxation rate≤7.5%.Endurance quality：Coating is zinc aluminum alloy coating, quality of coating >=300g/m2, in coating
Aluminium content >=4.2%, coating durability are the 2 times or more of current galvanizing.
Technical solution is used by the present invention solves the above problems：High tough, permanent seal cooling bridge cable major diameter
1960MPa grades of Zn-Al Alloy Coated Steel Wires, the preparation method of steel wire product include the following steps
(1) wire rod type selecting
Wire rod selects a diameter of 12mm~13mm, the super clean by sorbitizing (including water-bath, salt bath and lead bath), mistake
Eutectoid steel high-carbon steel wire rod, chemical composition by mass percentage for C 0.85~0.95%, Si 0.12~1.30%,
Mn0.30~0.90%, P≤0.015%, S≤0.005%, Cr0.20~0.60%, Cu≤0.05%.Its metallographic structure is expired
Foot：Decarburized layer≤0.07%, sorbite >=85%, must not have martensite and network cementite at grain size 7；Its mechanical property
Meet tensile strength >=1290MPa, reduction of area >=30%, elongation >=10%.
The installation warrants of each element are in steel wire chemical composition, and the main hardening constituent of wire rod is C element, and phosphorus content improves,
The percentage composition of cementite can be improved, optimizes sheet spacing, the intensity of steel is made to improve, but phosphorus content is excessively high, is heat-treated phase transformation
Proeutectoid cementite is formed in grain boundary so that the toughness plasticity of material drastically declines in the process.The content for improving Si elements can
To improve the intensity of steel, Si element solid solutions strengthen the ferrite lamella in pearlite, enhance ferritic stability, so as to shadow
Ring material aging characteristic, reduce steel wire lead bath degreasing and it is zinc-plated when loss of strength.Cr elements mainly and iron atom shape
Into alloyed cementite, the stability of cementite is improved.It, can be in lead bath degreasing and hot dip in the case of big drawing deformation amount
The solution modeling of carbon atom is reduced during allumen, reduces the loss of the strength of materials and toughness.Solubility of the P in iron is very
It is small, therefore in During Ingot Solidification, with the solidification of molten steel, P will be enriched with to the part of ot-yet-hardened, and it is last to rest on steel ingot
It solidifies position (steel ingot central part, between top or branch tissue) and forms sulphide inculsion, cause macrostructure's grade of steel wire not
Uniformly (dendritic segregation, regional segregation), therefore, P must be controlled as harmful element.
The selection gist of steel wire metallographic structure：Sorbite is the desired tissue of high-carbon steel wire drawing, but steel wire is in sorbite
But often with the generation of martensite and network cementite when change is dealt with improperly, and the presence of martensite and cementite network makes steel wire
Micro-crack easily is being formed with matrix junction in drawing, steel wire micro-crack when being on active service is easy for occurring to extend finally making steel wire
Fracture.During the production practices of big specification high-carbon steel wire rod, due to traditional Stevr rub air-cooled line cooling capacity it is inadequate, lead
Cause high-carbon steel wire rod pearlite lamella is coarse, and sorbite rate is low, and the network cementite of pro-eutectoid occurs in wire rod center, these are all
Seriously affect the performance of high-carbon steel wire rod and its deep processed product.Wire rod of the present invention is effective by water-bath, salt bath and lead bath processing
Avoid problem above.
(2) steel wire drawing
In drawing process, when steel wire is plastically deformed by radial direction drawing stress, diameter attenuates, and ferrite also occurs
Plastic deformation, and cementite is with the increase of compressive deformation power, piece spacing constantly reduces, and part is even broken.Final pearlite
Lamella is approximately parallel to drawing axial direction, in threadiness.When drawing deformation amount reaches certain value, the rupture of cementite lamella, finally
Being uniformly distributed in tissue becomes hardening constituent, but the rupture of cementite causes shear stress to decline, degraded toughness.In addition, bridge
Cable is bridge and main bearing carrier, in order to improve the durability of cable materials, needs to carry out hot dip anti-corrosion.Above by drawing
Hypereutectoid steel material structure after pulling out easily be precipitated under heating condition carbon atom formed segregation, make the strength of materials further improve and
Toughness more deteriorates.
In order to obtain the equalization point of intensity of steel wire and toughness, present invention employs following drawing process parameters：
Using Ф 12.00mm~Ф 15.00mm wire rods through straight drawing machine continuous drawing to Ф 4.90mm~Ф
The bright steel wire of 6.90mm, total draught are about 70~90%, and using 6 passages to 9 passage drawings, single track compression ratio is about
14%~29%；It is cooled down after per pass drawing using water cooling reel, wire drawing die uses direct water-cooling.The application drawing, drawing process
In need not annealing, not only save cost, and can be ensured that the single of steel wire ingredient, improve the sorbitic ratio of steel wire.
By a diameter of 4.90mm~6.90mm of the bright steel wire of more than drawing process, tensile strength >=2000MPa resists
Twisting property is excellent：Sample both ends fasten, and jaw spacing is 100d, and one end of sample can be moved along sample axis direction, another
End is rotated with 60 turns per minute of speed, until sample reverses, number of revolutions should be >=20 times.
(3) wire galvanization aluminium alloy
Using synchronous take-up and synchronous unwrapping wire during plating, it is 450 DEG C~470 DEG C that steel wire immerses temperature after helping plating
Pure galvanized pot generates pure zinc coating and zinc-iron alloy layer, then standby by smearing trial assembly, erases a part of zinc, entering back into temperature is
430 DEG C~470 DEG C allumen hot dip pots, the pot temperature are higher than 417 DEG C of the fusing point of pure zinc, therefore the first stage of steel wire surface
Pure zinc layer can largely melt, zinc-iron alloys absorb aluminium be changed into the preferable zinc-iron-aluminium coat of flexibility, while in steel wire
Surface Creation zinc-iron-aluminum alloy coating；
Idiographic flow includes：Lead bath degreasing → hot water cleaning → chlorohydric acid pickling → hot water cleaning → weak base cleaning → hot water wash
→ ammonium chloride zinc chloride solvent helps plating → galvanizing by dipping-nitrogen to smear examination → hot dip allumen → nitrogen and smears and wipe → take-up；
Specific processing step is as follows：
Lead bath degreasing：By steel wire by the lead bath of 420-460 DEG C of melting, the phosphatization of remained on surface is about made by the several seconds
Film, greasy dirt and lubricant burn off；
Hot water cleans：Remove the remaining film impurity of steel wire surface and residual oxide；
Chlorohydric acid pickling：By the hydrochloric acid of 10-30wt%, the oxide skin and residue of steel wire surface after degreasing are removed；
Hot water cleans：Remove the residual acid of steel wire surface and residual oxide；
Weak base is washed：Neutralize and remove the residual acid of steel wire surface after pickling；
Help plating：Steel wire is uniformly through quickening liquid, and ammonium chloride and zinc chloride mix in certain proportion in quickening liquid, quality
Than being 1:2 to 3:4, bright zinc-iron alloys are first generated in steel wire surface, activation wire rod surface, cleaning wire surface prevents again
Secondary oxidation, and improve and can be smoothed out infiltrating, dissolve and spreading between iron and zinc and allumen；
Galvanizing by dipping：The zinc that steel wire after surface treatment is immersed to melting is bathed, by means of the thermal expansion of iron and two kinds of metal interfaces of zinc
Scattered effect forms coating.The difficult point of double immersion plating is that the ingredient plated in pot is difficult control, this is because pure zinc layer zinc-plated for the first time
It can be melted in Alloy Plating pot, while the aluminium that transition zone zinc-iron alloy layer will be also absorbed in alloy pot is transformed into Fe-Zn-A1 gold
Compound between category if improper process control, causes the aluminium content in alloy pot to reduce rapidly.Therefore in order to ensure alloy pot into
The stabilization divided, the first time thickness of zinc-plated pure zinc layer are strictly controlled.Trace rare-earth element is added in the present invention in zinc pot
Or the alloying element such as elements such as magnesium, silicon, realize effective control of pure zinc layer thickness；
Nitrogen, which is smeared, to be wiped：The extra zinc layers of skim-coat are erased by being blown from the steel wire that zinc pot is drawn by nitrogen；
Hot dipping of zinc-aluminum alloy：Steel wire after will be zinc-plated immerses Zn-Al alloy melt, by zinc, iron, aluminium diffusion
Form zinc aluminum alloy coating；
Nitrogen, which is smeared, to be wiped：The steel wire drawn from zinc-aluminum pot by protective nitrogen is blown and is smeared, it is ensured that coating is bright and clean；
Take-up：Coating wire after cooling in air is collected into the neat drum of rule；
(4) steel wire stabilization is handled
In order to obtain further improving for mechanical properties of wires, anti-relaxation and straight line performance, to being wound into the steel wire of disk
Stabilization processes are done, it is quenched including sensing heating and tension, based on studying various sample, according to the stabilization of different heating temperature
Change affecting parameters of the processing to mechanical properties of wires and straight line performance, determine optimum stabilization processes temperature and tension, with
Ensure that steel wire has best relaxation resistance and linearity.
By drum with putting with receipts, setting induction heating temperature is 300~400 DEG C, and heating time at least keeps 2~6s, and
The tension for setting straining pulley is 25%~50% nominal Fracture Force, and the processing later stage is air-cooled to steel wire progress, is still protected during air-cooled
The tension processing to steel wire is held, so as on the basis of other mechanical performances are not reduced, ensure major diameter superhigh intensity
Intensity, linearity, relaxation rate and the steel wire axial direction uniformity of Zn95Al5 Alloy Coating Steel Wires.
The microstructure of steel wire obtained by above-mentioned technical proposal be followed successively by from outside to inside zinc oxide and alumina mixture, zinc-
Aluminium alloy eutectic structure, aluminum-iron alloy and Zn-Al alloy, zinc-aluminum-iron alloy, iron, it is as shown in the table.
Hot dip Zn-Al coating metallographic structure is as follows with being distributed
After hot dip, the mass content 4.2~7.2% of aluminium in zinc aluminum alloy coating, the coating weight on unit area
Not less than 300g/m2, coating uniformity is good, copper sulfate test：Leaching is placed in 1min in copper-bath, rapid to take out, and uses immediately
Water purification is rinsed, and cotton observes after drying, it is desirable that coppering phenomenon do not occur for surface, >=4 times.By observe after sample salt fog macroscopic view and
Microscopic appearance finds that hot dip Zn-Al Alloy Coated Steel Wire has better corrosion resistance compared to pure zinc coating steel wire.Study carefully its original
Because being that zinc aluminum alloy coating surface has the more sull of dense uniform and the stronger Zn- of a large amount of corrosion resistances
Al phases and Fe-Al phases, so as to improve steel wire environmental corrosion resisting performance.Electrochemical tests test result shows hot dip Zn-
Al alloy-steel wires are demonstrated by better corrosion resistance.This is because hot dip zn-al alloy coating surface form it is finer and close
Uniform ZnOAl2O3Film, while there is a large amount of more corrosion resistant rich aluminium phases and zinc-rich phase in its coating microstructure.
This application involves steel wire product diameter 5.00~7mm ± 0.07mm, out-of-roundness≤0.07mm, tensile strength >=
1960MPa, yield strength >=1660MPa, relaxation rate hold lotus 1000h at 20 ± 2 DEG C under 70% Nominal Tensile, pine
Relaxation rate≤7.5%；Elongation percentage >=4.0%, elasticity modulus (2.0 ± 0.1) × 105MPa, alternating bending frequency：Take one section of sample
Do 180 ° of bend tests, bending arc radius is 20mm, and after alternating bending 5 times, specimen surface, which must not generate, any loses phenomenon；
Winding performance：After being closely wound 8 circles on the plug of a diameter of 3 times of steel wire nominal diameter, steel wire should be not broken；Torsional property：
Sample both ends fasten, and jaw spacing is 100d, and one end of sample can be moved along sample axis direction, and the other end is with 60 turns per minute
Speed rotation, until sample reverses, number of revolutions should be >=14 times.
Quality of coating is：Coating uniformity tests (copper sulfate test)：Leaching is placed in 1min in copper-bath, takes rapidly
Go out, rinsed immediately with water purification, cotton is observed after drying, it is desirable that coppering phenomenon, dipping time >=4 time do not occur for surface；Coating is attached
Performance：Sample hot-dip coating answers adhesion-tight after being closely wound 8 circles on the plug of a diameter of 5 times of steel wire nominal diameter, does not permit
Perhaps it is cracking, peeling, peeling phenomenon；Apparent mass：The surface quality of steel wire should be smooth, uniformly, without cicatricle, crackle, burr,
Mechanical damage, surface quality are good；Free set-back：In a free state, when being placed in plane, end upwarps value not to 5m long steel wires
More than 15cm；The string sagitta of arc is high：Chord length is the steel wire of 1m when being unfetteredly placed in smooth plane, string, arc it is maximum from
Right rise is not greater than 15mm；Fatigue behaviour：Under conditions of the stress upper limit is 980MPa, stress amplitude 510MPa, through overstress
Recycle 2,000,000 times it is not broken.
Compared with prior art, the advantage of the invention is that：This application provides a kind of bridge cable major diameter is high-strength
The manufacturing method of high tenacity Zn-Al Alloy Coated Steel Wire is spent, steel wire product has intensity high, and good toughness, anti-torsion performance is good, resists
Fatigue behaviour is higher than same specification existing product, and fatigue stress amplitude improves 41% than existing product.Coating durability is good,
Corrosion resistance is the 2 times or more of existing zinc-coated wire.
Specific embodiment
The present invention is described in further detail with reference to embodiments.
Embodiment 1
The implementation process of the Zn95Al5 Alloy Coating Steel Wires of 5mm-1960MPa in the present embodiment is as follows：
(1) wire rod selects
Wire rod selects a diameter of 12mm, belongs to super clean, the hypereutectoid steel high-carbon steel wire rod by water-bath patent,
Chemical composition by mass percentage for C 0.85~0.95%, Si 0.12~1.30%, Mn0.30~0.90%, P≤
0.015%th, S≤0.005%, Cr0.20~0.60%, Cu≤0.05%；Metallographic structure：Decarburized layer≤0.07%, grain size are
7th, sorbite >=85%, without martensite and network cementite；Mechanical property meets：Tensile strength >=1290MPa, reduction of area >=
30%th, elongation >=10%.
(2) steel wire drawing
Bright steel wire of the wire rod through straight drawing machine continuous drawing Ф 4.90mm, point 9 passage drawings, single track compression ratio is about
It is 14%~29%；Cooled down after per pass drawing using water cooling reel, wire drawing die uses direct water-cooling, in drawing process without annealing at
Reason.
(3) wire galvanization aluminium alloy
Using synchronous take-up and synchronous unwrapping wire during plating, it is 450 DEG C~470 DEG C that steel wire immerses temperature after helping plating
Pure galvanized pot generates pure zinc coating and zinc-iron alloy layer, then standby by smearing trial assembly, erases a part of zinc, entering back into temperature is
430 DEG C~460 DEG C allumen hot dip pots, the pure zinc layer of steel wire surface first stage melts in Alloy Plating pot, zinc-iron alloys
It absorbs aluminium and is changed into the preferable zinc-iron-aluminium coat of flexibility, steel wire surface generation zinc-iron-aluminum alloy coating, finally in most table
Layer production protectiveness Zinc-aluminium；
The mass content 4.2~7.2% of aluminium in zinc aluminum alloy coating, the coating weight on unit area are not less than 300g/
m2；
Idiographic flow includes：Lead bath degreasing → hot water cleaning → chlorohydric acid pickling → hot water cleaning → weak base cleaning → hot water wash
→ ammonium chloride zinc chloride solvent helps plating → galvanizing by dipping-nitrogen to smear examination → hot dip allumen → nitrogen and smears and wipe → take-up；
Specific processing step is as follows：
Lead bath degreasing：By steel wire by the lead bath of 420-460 DEG C of melting, the phosphatization of remained on surface is about made by the several seconds
Film, greasy dirt and lubricant burn off；
Hot water cleans：Remove the remaining film impurity of steel wire surface and residual oxide；
Chlorohydric acid pickling：By the hydrochloric acid of 10-30wt%, the oxide skin and residue of steel wire surface after degreasing are removed；
Hot water cleans：The residual acid of steel wire surface and residual oxide are removed using 60-100 DEG C of hot water；
Weak base is washed：Neutralize and remove the residual acid of steel wire surface after pickling；
Help plating：Steel wire includes ammonium chloride and zinc chloride and surfactant, quickening liquid uniformly through quickening liquid, quickening liquid
The mass ratio of middle ammonium chloride and zinc chloride is 2：3, bright zinc-iron alloys are first generated in steel wire surface, activate wire rod surface, clearly
Clean steel wire surface prevents re-oxidation, and can be smoothed out infiltrating, dissolve and spreading between iron and zinc and allumen；
Galvanizing by dipping：The zinc that steel wire after surface treatment is immersed to melting is bathed, by means of the thermal expansion of iron and two kinds of metal interfaces of zinc
Scattered effect forms coating；
Nitrogen, which is smeared, to be wiped：The extra zinc layers of skim-coat are erased by being blown from the steel wire that zinc pot is drawn by nitrogen；
Hot dipping of zinc-aluminum alloy：Steel wire after will be zinc-plated immerses Zn-Al alloy melt, by zinc, iron, aluminium diffusion
Form zinc aluminum alloy coating；
Nitrogen, which is smeared, to be wiped：The steel wire drawn from zinc-aluminum pot by protective nitrogen is blown and is smeared, it is ensured that coating is bright and clean；
Take-up：Coating wire after cooling in air is collected into the neat drum of rule.
(4) steel wire stabilization is handled
In order to obtain further improving for mechanical properties of wires, anti-relaxation and straight line performance, to being wound into the steel wire of disk
Stabilization processes are done, are handled including sensing heating and tension, by drum with putting with receipts, setting induction heating temperature is 300~400
DEG C, heating time keeps 3s, and sets the application tension of straining pulley the processing later stage is to steel wire for 25%~50% nominal Fracture Force
Carry out air-cooled, the air-cooled tension processing still kept in the process to steel wire.
The performance of the application steel wire meets technology requirement as shown in table 1 below
Embodiment 2
The implementation process of the Zn95Al5 Alloy Coating Steel Wires of 7mm-1960MPa in the present embodiment is as follows：
The a diameter of 15mm of wire rod selection, super clean, hypereutectoid steel high-carbon steel wire rod by water-bath patent, wire rod
Performance is the same as embodiment 1.Bright steel wire of the wire rod through straight drawing machine continuous drawing Ф 6.0mm, point 9 passage drawings, single track pressure
Shrinkage is about 14%~29%；It is cooled down after per pass drawing using water cooling reel, wire drawing die uses direct water-cooling, nothing in drawing process
Annealing.
So to carrying out hot dip processing
Using synchronous take-up and synchronous unwrapping wire during plating, it is 450 DEG C~470 DEG C that steel wire immerses temperature after helping plating
Pure galvanized pot generates pure zinc coating and zinc-iron alloy layer, then standby by smearing trial assembly, erases a part of zinc, entering back into temperature is
430 DEG C~460 DEG C allumen hot dip pots, the pure zinc layer of steel wire surface first stage melts in Alloy Plating pot, zinc-iron alloys
It absorbs aluminium and is changed into the preferable zinc-iron-aluminium coat of flexibility, steel wire surface generation zinc-iron-aluminum alloy coating, finally in most table
Layer production protectiveness Zinc-aluminium,；
The mass content 4.2~7.2% of aluminium in zinc aluminum alloy coating, the coating weight on unit area are not less than 300g/
m2；
Idiographic flow includes：Lead bath degreasing → hot water cleaning → chlorohydric acid pickling → hot water cleaning → weak base cleaning → hot water wash
→ ammonium chloride zinc chloride solvent helps plating → galvanizing by dipping-nitrogen to smear examination → hot dip allumen → nitrogen and smears and wipe → take-up；
Specific processing step is as follows：
Lead bath degreasing：By steel wire by the lead bath of 420-460 DEG C of melting, the phosphatization of remained on surface is about made by the several seconds
Film, greasy dirt and lubricant burn off；
Hot water cleans：Remove the remaining film impurity of steel wire surface and residual oxide；
Chlorohydric acid pickling：By the hydrochloric acid of 10~30wt%, the oxide skin and residue of steel wire surface after degreasing are removed；
Hot water cleans：The residual acid of steel wire surface and residual oxide are removed using 60 DEG C~120 DEG C hot water；
Weak base is washed：Neutralize and remove the residual acid of steel wire surface after pickling；
Help plating：Steel wire includes ammonium chloride and zinc chloride and surfactant, quickening liquid uniformly through quickening liquid, quickening liquid
The mass ratio of middle ammonium chloride and zinc chloride is 3：4, bright zinc-iron alloys are first generated in steel wire surface, activate wire rod surface, clearly
Clean steel wire surface prevents re-oxidation, and can be smoothed out infiltrating, dissolve and spreading between iron and zinc and allumen；
Galvanizing by dipping：The zinc that steel wire after surface treatment is immersed to melting is bathed, by means of the thermal expansion of iron and two kinds of metal interfaces of zinc
Scattered effect forms coating；
Nitrogen, which is smeared, to be wiped：The extra zinc layers of skim-coat are erased by being blown from the steel wire that zinc pot is drawn by nitrogen；
Hot dipping of zinc-aluminum alloy：Steel wire after will be zinc-plated immerses Zn-Al alloy melt, by zinc, iron, aluminium diffusion
Form zinc aluminum alloy coating；
Nitrogen, which is smeared, to be wiped：The steel wire drawn from zinc-aluminum pot by protective nitrogen is blown and is smeared, it is ensured that coating is bright and clean；
Take-up：Coating wire after cooling in air is collected into the neat drum of rule.
(4) steel wire stabilization is handled
In order to obtain further improving for mechanical properties of wires, anti-relaxation and straight line performance, to being wound into the steel wire of disk
Stabilization processes are done, are handled including sensing heating and tension, by drum with putting with receipts, setting induction heating temperature is 300~350
DEG C, heating time keeps 4-6s, and sets the application tension of straining pulley the processing later stage is to steel for 25%~50% nominal Fracture Force
Silk carries out air-cooled, the air-cooled tension processing still kept in the process to steel wire.
The present embodiment product equally meets the technology requirement shown in table 1.
In embodiment 1 and embodiment 2 microstructure of steel wire be followed successively by from outside to inside zinc oxide and alumina mixture,
Zn-Al alloy eutectic structure, aluminum-iron alloy and Zn-Al alloy, zinc-aluminum-iron alloy, iron (wire rod ontology).
In addition to the implementation, it is all to use equivalent transformation or equivalent replacement the invention also includes there is an other embodiment
The technical solution that mode is formed should all be fallen within the scope of the hereto appended claims.
Claims (5)
1. a kind of high tough, permanent seal cooling bridge cable major diameter 1960MPa Zn-Al Alloy Coated Steel Wires, it is characterised in that：It should
The manufacturing method of steel wire includes the following steps
(1) wire rod makes
Wire rod selects a diameter of 12mm~15mm, the super clean, the hypereutectoid steel high-carbon steel wire rod that are handled by sorbitizing, changes
Study point by mass percentage for C 0.85~0.95%, Si 0.12~1.30%, Mn0.30~0.90%, P≤
0.015%th, S≤0.005%, Cr0.20~0.60%, Cu≤0.05%；
Its metallographic structure meets：Decarburized layer≤0.07%, sorbite >=85%, must not have martensite and netted ooze grain size 7
Carbon body；
Its mechanical property meets tensile strength >=1290MPa, reduction of area >=30%, elongation >=10%；
(2) steel wire drawing
Using Ф 12.00mm~Ф 15.00mm wire rods through straight drawing machine continuous drawing to Ф 4.90mm~Ф 6.90mm's
Bright steel wire, total draught are about 70~85%, and using 6 passages to 9 passage drawings, single track compression ratio is about 14%~
29%；It is cooled down after per pass drawing using water cooling reel, wire drawing die uses direct water-cooling；
(3) wire galvanization aluminium alloy
Using synchronous take-up and synchronous unwrapping wire during plating, it is 450 DEG C~470 DEG C pure platings that steel wire immerses temperature after helping plating
Zinc pot generates pure zinc coating and zinc-iron alloy layer, then standby by smearing trial assembly, erases a part of zinc, and it is 430 DEG C to enter back into temperature
~460 DEG C of allumen hot dip pots, which is higher than 417 DEG C of the fusing point of pure zinc, therefore the first stage of steel wire surface is pure
Zinc layers can largely melt, and zinc-iron alloys absorb aluminium and are changed into the preferable zinc-iron-aluminium coat of flexibility, while steel wire surface is given birth to
Into zinc-iron-aluminum alloy coating；
Idiographic flow includes：Lead bath degreasing → hot water cleaning → chlorohydric acid pickling → hot water cleaning → weak base cleaning → hot water wash → chlorine
Change ammonium zinc chloride solvent helps plating → galvanizing by dipping-nitrogen to smear examination → hot dip allumen → nitrogen and smears and wipe → take-up；
Specific processing step is as follows：
Lead bath degreasing：By steel wire by the lead bath of 420-460 DEG C of melting, phosphating coat, the oil of remained on surface are about made by the several seconds
Dirty and lubricant burn off；
Hot water cleans：Remove the remaining film impurity of steel wire surface and residual oxide；
Chlorohydric acid pickling：By the hydrochloric acid of 10-30wt%, the oxide skin and residue of steel wire surface after degreasing are removed；
Hot water cleans：Remove the residual acid of steel wire surface and residual oxide；
Weak base is washed：Neutralize and remove the residual acid of steel wire surface after pickling；
Help plating：Steel wire is uniformly through quickening liquid, and the mass ratio of ammonium chloride and zinc chloride is 2 in quickening liquid：3, in steel wire surface elder generation
Bright zinc-iron alloys are generated, activation wire rod surface, cleaning wire surface prevents re-oxidation, and can be smoothed out iron and zinc
And it infiltrates, dissolve and spreads between allumen；
Galvanizing by dipping：The zinc that steel wire after surface treatment is immersed to melting is bathed, and the thermal diffusion by means of iron and two kinds of metal interfaces of zinc is made
With formation coating；
Nitrogen, which is smeared, to be wiped：The extra zinc layers of skim-coat are erased by being blown from the steel wire that zinc pot is drawn by nitrogen；
Hot dipping of zinc-aluminum alloy：Steel wire after will be zinc-plated immerses Zn-Al alloy melt, is formed by the diffusion of zinc, iron, aluminium
Zinc aluminum alloy coating；
Nitrogen, which is smeared, to be wiped：The steel wire drawn from zinc-aluminum pot by protective nitrogen is blown and is smeared, it is ensured that coating is bright and clean；
Take-up：Coating wire after cooling in air is collected into the neat drum of rule；
(4) steel wire stabilization is handled
In order to obtain further improving for mechanical properties of wires, anti-relaxation and straight line performance, the steel wire for being wound into disk is done surely
Determining processing, is handled including sensing heating and tension, and by drum with putting with receipts, setting induction heating temperature is 300~400 DEG C,
Heating time at least keeps 2~6s, and sets the tension of straining pulley the processing later stage is to steel wire for 25%~50% nominal Fracture Force
It carries out air-cooled, is still kept during air-cooled to the processing of the tension of steel wire, so as on the basis of other mechanical performances are not reduced,
Ensure intensity, linearity, relaxation rate and the steel wire axial direction uniformity of major diameter superhigh intensity Zn95Al5 Alloy Coating Steel Wires.
2. height according to claim 1 is tough, permanent seal cooling bridge cable major diameter 1960MPa zinc aluminum alloy coating steel
Silk, it is characterised in that：The microstructure of gained steel wire is followed successively by zinc oxide and alumina mixture, Zn-Al alloy from outside to inside
Eutectic structure, aluminum-iron alloy and Zn-Al alloy, zinc-aluminum-iron alloy, iron.
3. height according to claim 1 is tough, permanent seal cooling bridge cable major diameter 1960MPa zinc aluminum alloy coating steel
Silk, it is characterised in that：The mass content 4.2~7.2% of aluminium in zinc aluminum alloy coating, the coating weight on unit area are not less than
300g/m2, coating uniformity is good, copper sulfate test：Leaching is placed in 1min in copper-bath, rapid to take out, and is rushed immediately with water purification
It washes, cotton is observed after drying, it is desirable that coppering phenomenon do not occur for surface, >=4 times.
4. height according to claim 1 is tough, permanent seal cooling bridge cable major diameter 1960MPa zinc aluminum alloy coating steel
Silk, it is characterised in that：5.00~7mm of diameter ± 0.07mm of gained steel wire product, out-of-roundness≤0.07mm, tensile strength >=
1960MPa, yield strength >=1660MPa, relaxation rate hold lotus 1000h at 20 ± 2 DEG C under 70% Nominal Tensile, pine
Relaxation rate≤7.5%；Elongation percentage >=4.0%, elasticity modulus (2.0 ± 0.1) × 105MPa, alternating bending frequency：Take one section of sample
Do 180 ° of bend tests, bending arc radius is 20mm, and after alternating bending 5 times, specimen surface, which must not generate, any loses phenomenon；
Winding performance：After being closely wound 8 circles on the plug of a diameter of 3 times of steel wire nominal diameter, steel wire should be not broken；Torsional property：
Sample both ends fasten, and jaw spacing is 100d, and one end of sample can be moved along sample axis direction, and the other end is with 60 turns per minute
Speed rotation, until sample reverses, number of revolutions should be >=14 times.Copper sulfate test：Leaching is placed in 1min in copper-bath, fast
Speed is taken out, and is rinsed immediately with water purification, cotton is observed after drying, it is desirable that coppering phenomenon do not occur for surface, >=4 times；Adherence of coating
Energy：Sample hot-dip coating answers adhesion-tight after being closely wound 8 circles on the plug of a diameter of 5 times of steel wire nominal diameter, does not allow
Now crack, peeling, peeling phenomenon；Apparent mass：The surface quality of steel wire should be smooth, uniformly, without cicatricle, crackle, burr, machinery
Damage, surface quality are good；Free set-back：In a free state, when being placed in plane, end upwarps value and is not more than 5m long steel wires
15cm；The string sagitta of arc is high：When chord length is that the steel wire of 1m is unfetteredly placed in smooth plane, string, the maximum of arc are sweared naturally
Height is not greater than 15mm；Fatigue behaviour：Under conditions of the stress upper limit is 980MPa, stress amplitude 510MPa, by Cyclic Stress
2000000 times not broken.
5. height according to claim 1 is tough, permanent seal cooling bridge cable major diameter 1960MPa zinc aluminum alloy coating steel
Silk, it is characterised in that：Sorbitizing processing described in step (1) includes water-bath, lead bath and salt bath, and wherein water-bath refers to that wire rod connects
It is continuous to refer to pass through in molten lead bath to quench by the wire rod continuous uniform of austenitizing with toughening wire rod, lead bath uniformly across water-bath
Fire, salt bath refer to the processed wire rod of lead bath it is sorbitic that wire rod is cooled to 480-550 DEG C of completion again rapidly by salt bath
Transformation.
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| CN111112353A (en) * | 2019-12-16 | 2020-05-08 | 天地科技股份有限公司 | Steel strand and manufacturing method and application thereof |
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| CN111101084A (en) * | 2020-01-14 | 2020-05-05 | 江苏航运职业技术学院 | Zinc-aluminum alloy steel wire coating double-dip plating process for new bridge cable |
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Application publication date: 20180703 |