CN109055679B - High-intensitive high torsion bridge rope zinc-coated wire and its preparation process - Google Patents
High-intensitive high torsion bridge rope zinc-coated wire and its preparation process Download PDFInfo
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- CN109055679B CN109055679B CN201811019855.3A CN201811019855A CN109055679B CN 109055679 B CN109055679 B CN 109055679B CN 201811019855 A CN201811019855 A CN 201811019855A CN 109055679 B CN109055679 B CN 109055679B
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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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/34—Methods of heating
- C21D1/44—Methods of heating in heat-treatment baths
- C21D1/48—Metal baths
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- 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
- B21C1/003—Drawing materials of special alloys so far as the composition of the alloy requires or permits special drawing methods or sequences
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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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/34—Methods of heating
- C21D1/44—Methods of heating in heat-treatment baths
- C21D1/46—Salt baths
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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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
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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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
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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
- 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/525—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length for wire, for rods
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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
- 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
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/009—Pearlite
Abstract
The invention discloses a kind of high-intensitive high torsion bridge rope zinc-coated wire and its preparation processes, belong to bridge cable wire rod technical field.Specific preparation process includes: 1) to select high-quality wire rod；2) single pass or the pre- drawing of multi-pass: the preceding percentage pass reduction of reduction ratio≤20% of the pre- drawing of single pass, the pre- drawing of multi-pass is greater than rear percentage pass reduction；3) heat-treated offline: the wire rod that step 2) obtains is heat-treated using one of salt bath, lead bath or water-bath；4) throwing obtains finished product zinc-coated wire.The preparation process that the present invention designs does not change the technological parameters such as heat-treated offline and throwing, easy to operate, feasibility is stronger relative to the preparation process of existing conventional wire rod；And obtained zinc-coated wire tensile strength is not less than 1860MPa, and twisting property is presented as that number of torsions not less than 18 times, meets bridge rope service demand.
Description
Technical field
The present invention relates to wire rod and its production methods, belong to bridge cable wire rod technical field, more particularly to one kind
High-intensitive high torsion bridge rope zinc-coated wire and its preparation process.
Background technique
High-strength galvanized steel wire is widely used in bridge because it is with excellent mechanical property and good anti-corrosion ability
The important events such as cable, suspension cable.High-strength galvanized steel wire is that it is continuous to first pass through multi-pass using high-carbon pearlitic steel wire rod as raw material
Cold drawing deformation obtains extra-high strength wire, then carries out galvanizing by dipping processing again, steel wire surface obtain it is continuous, be well combined
Hot galvanized layer, to obtain good corrosion resistance.
Since Mechanism of High Strength Pearlite Steel Wire is plastically deformed through big deformation quantity, inside there are higher deformation storages can be (main
Will the presence in the form of residual stress, high density dislocation etc.), it is extremely sensitive to heating process.(the plating in the hot galvanizing process of steel wire
For zinc temperature generally at 440 DEG C~460 DEG C, the time is 20 seconds~40 seconds), residual stress, dislocation of high-tensile steel wires etc. will be sent out
A series of raw variations.Since steel wire surface directly contacts 450 DEG C or so liquid Zns, and inside needs to can be only achieved through heat transfer
Same temperature, since galvanizing time is short, the heating process for frequently resulting in steel wire surface and internal experience is inconsistent, causes originally
More uniform residual stress can become to be unevenly distributed, and macro manifestations are that steel wire torsion performance drastically reduces.
Currently, the bridge cable high-strength galvanized steel wire produced using domestic high-carbon steel wire rod, is not able to satisfy standard and wanted
The index asked is mainly the twist collar number of hot-dip galvanizing steel wire (standard sample, length 100d, d- steel wire diameter) lower than 14 circles (one
As 3~11 enclose), and high-tensile steel wires it is zinc-plated before twist collar number be generally attained by 25 circles or more.Bridge cable is with high-strength
The torsion index for spending zinc-coated wire becomes the key factor for limiting domestic high-carbon steel wire rod large-scale application.
As Chinese literature periodical " commemorate " metal product " start publication the metal product industry technology information of 40 anniversaries and 2012 hand over
Stream meeting " discloses the research and development of Longspan Bridge cable high-performance zinc-coated wire, for Longspan Bridge cable high-performance steel
Silk is and to have the product of high torsion, underrelaxation performance concurrently while requiring with high intensity levels.Select Baosteel, Nippon Steel
The dedicated wire rod of bridge cable zinc-coated wire, using advanced production technology, concrete technology flow process are as follows: high-quality wire rod → pickling
→ high pressure washing → middle temperature phosphating → washing → saponification → drying → rotation unwrapping wire → Φ straight drawing machine of 1 200mm × 9 is drawn
Pull out → the big spool spooling of 1 400mm of Φ → zinc-plated unwrapping wire → degreasing → cascade sealing pickling → compound helps plating → drying → hot dip
Zinc → wiping → air-cooled and water cooling → flower basket rack take-up → telescopic unwrapping wire → finishing → spool spooling → stabilisation I-beam wheel
Unwrapping wire → the → the first tensioning of intersection aligning → removable cooling → the second tensioning → traction of heating in medium frequency → control → is adjusted and receives
Line → bundling → inspection → packaging → storage.It solves the contradiction of high torsion and underrelaxation, and improves the strong of zinc-coated wire
Degree, produces the performance prestressed high zinc-coated wire for meeting Longspan Bridge demand for development.The tensile strength of the product is respectively
1670,1770,1860MPa tri- ranks；Torsion >=8~14 times；Relaxation rate≤2.5%；Fatigue test >=200 time；Naturally it swears
Height≤15mm/m；Zn-coat mass >=300g/m2；Copper sulfate test >=4 time；>=8 circle of Zinc attachability winding；Elongation percentage >=
4.0%；Alternating bending >=5 time.
For another example Chinese invention patent application (application publication number: CN105803176A, data of publication of application: 2016-07-27) is public
Opened a kind of method for improving bridge cable zinc-coated wire twisting property, it is specific to select high-carbon pearlite wire rod, successively into
Row pickling, phosphatization, cold drawing, zinc-plated, stabilization processes obtain finished product zinc-coated wire；After drawing intensity of steel wire 1 850MPa~
2050MPa, torsional fracture circle number >=20 circles；After cold drawing to steel wire carry out lonneal processing after it is zinc-plated again, at lonneal
Managing temperature is 200 DEG C~260 DEG C, and the time is for 24 hours~48h, and lonneal processing is using hot wind or high pressure steam heating.This
The method that kind carries out long-time lonneal to steel wire improves less structural homogenity, and operation hardly possible in the actual production process
Spend larger, unsuitable engineering application.
It is the maximum intensity requirement of current global practicability bridge rope zinc-coated wire for 2000MPa, it was reported that current new day
Iron uses the wire rod of the cold technique production of online salt bath control can successfully manufacture experimently out the zinc-coated wire met the requirements.However, domestic
What main Qiao Suo wire rod manufacturer mostly used is the air-cooled treatment process of stelmor, and air-cooled uniformity is cooling compared with salt bath more
Difference, therefore cause trial-production steel wire torsion performance unstable, requirement cannot be fully met.Currently, to domestic stelmor ventilated disc
Item carries out heat-treated offline again, and with the structural homogenity that improves wire rod, bridge rope industry has been reached common understanding at home, again offline
There are many techniques for heat treatment, for example, salt bath processing, lead bath processing and water bath processing etc..As (application is public for Chinese invention patent application
Cloth number: CN107227427A, data of publication of application: 2017-10-03) disclose 7.0mm2000MPa grades of zinc-coated wires of φ and its system
Method is made, which includes to rod bundle checkout stage, acid washing phosphorization stage, wire drawing stages, hot dip stage, stabilisation stage
Optimization, so that zinc-coated wire is had the characteristics that major diameter, high intensity, high-plasticity, though zinc-coated wire have diameter phi 7.0 ±
0.07mm, tensile strength Rm >=2000MPa, yield strength Rp0.2 >=1790MPa, elongation percentage A >=4%, bending (secondary/180 °)
>=8, winding (circle of 3d × 8) is not broken, reverses the characteristics of (secondary/360 °) >=8, meets market to the intensity of zinc-coated wire and moulds tough
Property require.That is structural homogenity of the stelmor air-blown rod after heat-treated offline again is obviously improved, and manufactures experimently galvanized steel
The twisting property of silk increases substantially before being relatively heat-treated, however also and not up to fully meets requirement, and main performance is still torsion
Performance is unstable, and the structural homogenity of wire rod needs to be further increased.
Summary of the invention
In order to solve the above technical problems, the present invention provides the mainstreams that one kind can not change existing bridge rope zinc-coated wire
Production process, but can improve and stablize the preparation process of the twisting property of trial-production zinc-coated wire.
To achieve the above object, the invention discloses a kind of preparation process of high-intensitive high torsion bridge rope zinc-coated wire,
Include the following steps:
1) high-carbon pearlite wire rod is selected；
2) reduction ratio≤20% (being not zero) of the pre- drawing of each passage, multi-pass single pass or the pre- drawing of multi-pass: are controlled
The preceding percentage pass reduction of pre- drawing is greater than rear percentage pass reduction, guarantees whole drafts >=12% of pre- drawing；Pre- drawing process
Middle control pulling rate≤1.5m/s, and temperature is no more than 40 DEG C before the mould of pre- drawing, temperature is no more than 130 DEG C after the mould of pre- drawing
(avoiding the too high homogenization for being unfavorable for wire rod interior tissue of temperature)；
3) heat-treated offline: the wire rod that step 2) obtains is carried out using one of salt bath, lead bath or water-bath difficult to understand
The processing of family name's body and Isothermal treatment；
4) technology for making tobacco threds handles to obtain finished product zinc-coated wire.
Further, in step 2), the continuity that the wire rod surface after pre- drawing is visible by naked eyes scratches or scratch depth
No more than 0.10mm, and wire rod ovality is no more than 0.4mm.
Also to guarantee that the surface microhardness of the wire rod after pre- drawing should should not contain to deform based on pearlite simultaneously
The overheated structures such as martensite or bainite.The pre- drawing is before heat-treated offline, the purpose is to increase energy storage inside wire rod,
Guarantee that wire rod structural transformation in next heat treatment process is more violent, the wire rod tissue after heat treatment is more uniform.And
And wire rod can generate work-hardening effect during drawing process, intensity will appear rising, in ascensional range and drawing process
Compression ratio it is directly related, there is existing mature theoretical formula to be calculated.
Preferably, the reduction ratio for controlling the pre- drawing of each passage is greater than 9%, but is less than or equal to 20%.
Further, in step 3), the temperature of the austenitizing processing is greater than 950 DEG C, and soaking time is more than 1min；Deng
The temperature of warm processing is 450~600 DEG C, and soaking time is greater than 50s；The purpose is to guarantee that wire rod interior tissue is acutely turned
Change.
Further, in step 3), the surface microhardness of wire rod is uniform sorbite group after the heat-treated offline
It knits, and the intensity of wire rod is no more than 40MPa with circle difference, guarantees finally to be prepared with this and has excellent tensile strength and torsion
The zinc-coated wire of performance.
Further, in step 1), the high-carbon pearlite wire rod is C according to the content of mass percent control each component
>=0.77%, Si:0.2~1.1%, Mn:0.3~0.9%.
For bridge rope zinc-coated wire, it is generally required to have higher tensile strength, and C, Si and Mn constituent content
Rationally the intensity of steel plate can be improved in control to a certain extent.The present invention is to carry out chemical component according to the intensity of trial-production steel wire
Reasonable selection and setting.
Further, martensite-free and bainite structure in the surface microhardness of the high-carbon pearlite wire rod, tension
Strength control is 1100~1600MPa, and reduction of area is more than or equal to 30%.
Further, in step 4), the technology for making tobacco threds successively includes pickling, phosphatization, multi-pass cold drawing, hot dip, steady
Fixedization and collection volume.
Preferably, to guarantee that the iron scale on wire rod surface is removed completely during acid washing phosphorization, surface has wire drawing item
Part；
Multi-pass cold drawing process uses 6~9 passages, before the mould of wire drawing and after mould temperature be no more than respectively 45 DEG C and
140 DEG C, drawing speed about 1.0~2.5m/s；
The medium temperature range of hot dip process is 440~470 DEG C, and hot dip speed is no more than 12m/min；
Heating temperature is no more than 420 DEG C in stabilization procedures, and pulling rate is lower than 220m/min, and wherein stabilization processes make to prepare
Obtained zinc-coated wire has underrelaxation performance requirement.
In order to preferably realize technical purpose of the invention, the invention also discloses be prepared using above-mentioned preparation process
The high torsion bridge rope zinc-coated wire of high intensity, its diameter is 5.0~7.5mm, tensile strength >=1860MPa, twisting property
In number of torsions >=18 time.
Therefore, preparation method disclosed by the invention solves tensile strength to a certain extent and twisting property cannot be simultaneously
The problem of taking into account, the zinc-coated wire being prepared meet the demand for development of Longspan Bridge.
The present invention is directed to the unstable problem of twisting property of existing stelmor air-blown rod, breaches existing
Technical bottleneck carries out prestretching before the high-carbon pearlite wire rod heat-treated offline of selection and pulls out processing, to increase energy storage inside wire rod,
Therefore wire rod structural transformation in next heat treatment process is more violent, and the wire rod tissue after heat treatment is more uniform, protects
The twisting property for having demonstrate,proved zinc-coated wire obtained is more excellent and stable.
The beneficial effects are mainly reflected as follows following aspects:
1, the preparation process that the present invention designs does not change at offline heat relative to the preparation process of existing conventional wire rod
The technological parameters such as reason and throwing, easy to operate, feasibility is stronger；
2, the zinc-coated wire that present invention design obtains solves the intensity of steel wire to a certain extent and torsion is used as a pair
Conflicting index there are the problem of, the zinc-coated wire diameter that is prepared is 5.0~7.5mm, tensile strength >=
1860MPa, number of torsions >=18 time in twisting property, that is, have both excellent tensile strength and twisting property, therefore be prepared
Zinc-coated wire meet bridge rope service demand, meet the demand for development of Longspan Bridge.
Detailed description of the invention
Fig. 1 is the heterogeneous microstructure figure (scanning electron microscope (SEM) photograph) of the pre- drawing shroud item of the present invention；
Fig. 2 is the heterogeneous microstructure figure (scanning electron microscope (SEM) photograph) of the pre- drawing hub disk item of the present invention；
Fig. 3 is the heterogeneous microstructure figure (transmission electron microscope picture) for the zinc-coated wire that the present invention is prepared.
Specific embodiment
In order to better explain the present invention, below in conjunction with the specific embodiment main contents that the present invention is furture elucidated, but
The contents of the present invention are not limited solely to following embodiment.
Embodiment 1
It is 7.0mm that this implementation, which provides a kind of diameter, the preparation process for the zinc-coated wire that tensile strength is 1960MPa grades,
Detailed process is as follows:
1) high-quality wire rod is selected: the high-carbon pearlite wire rod of selection diameter 15.0mm, main component C:0.89%, Si:
0.28%, Mn:0.70%, wire rod surface quality is good, and abnormal structures, the tensile strength such as martensite-free and bainite are
1350MPa, reduction of area 32%.
2) single pass or the pre- drawing of multi-pass: carrying out pre- drawing process to the wire rod of diameter 15.0mm, using single pass into
Row drawing, single pass reduction ratio are 12.89%, pulling rate are controlled during pre- drawing as 1.5m/s, and temperature before the mould of pre- drawing
It is 35 DEG C, temperature is 120 DEG C after the mould of pre- drawing；Wire rod diameter is 14.0mm after drawing；Also, observe the wire rod after pre- drawing
The continuity that surface is visible by naked eyes scratches, and wire rod ovality is 0.35mm；Wherein, in conjunction with Fig. 1 and Fig. 2 it is found that in pre- drawing
Before, the metallographic microstructure of wire rod is based on pearlite, and the lamella direction of growth of pearlite is inconsistent, comparatively in a jumble.
After pre- drawing, certain deformation occurs wire rod along drawing direction for mixed and disorderly pearlite lamella, and the pearlite direction of growth is relatively drawn
It is more consistent before pulling out, but since pre- drawing deflection is smaller, pearlite piece spacing has no significant change.The pearlite direction of growth
The pearlite of the original different growth of unified description receive the effect of drawing deformation, store certain energy in tissue
Amount, is conducive to the microstructure homogenization during subsequent heat-treated offline.
3) isothermal processes, heat-treatment medium choosing heat-treated offline: are carried out to the wire rod that the diameter after pre- drawing is 14.0mm
It is greater than 950 DEG C with the temperature of lead liquid, the austenitizing processing, soaking time 2min；The temperature of Isothermal treatment is 500
DEG C, soaking time 60s, the wire rod interior tissue after observing heat-treated offline is uniform Soxhlet body tissue, and wire rod is strong
Degree is no more than 40MPa with circle difference；
4) technology for making tobacco threds handles to obtain finished product zinc-coated wire: successively carrying out pickling, phosphatization, multi-pass cold drawing, hot dip, steady
Fixedization and collection volume, in which:
To guarantee that the iron scale on wire rod surface is removed completely during acid washing phosphorization, surface has drawing condition；
Multi-pass cold drawing process uses 7 passages, and temperature is no more than 45 DEG C and 140 respectively before the mould of wire drawing and after mould
DEG C, drawing speed about 1.5m/s；
The medium temperature range of hot dip process is 450~460 DEG C, and hot dip speed is no more than 12m/min；
Heating temperature is no more than 420 DEG C in stabilization procedures, and pulling rate is lower than 220m/min, and wherein stabilization processes make to prepare
Obtained zinc-coated wire has underrelaxation performance requirement.
It is 7.0mm, zinc-coated wire tensile strength >=2030MPa, twisting property >=18 circles, the galvanized steel that diameter, which is prepared,
Silk meets the requirement of bridge cable zinc-coated wire.And combine Fig. 3 it is found that the pearlite piece spacing of zinc-coated wire more compared with wire rod
It is tiny, and production mode reform consistency is stronger.Since the implantation of extraneous energy in drawing process is so that wire rod tissue is more uniform, because
The zinc-coated wire structural homogenity of this trial-production also increases substantially therewith, and twisting property stability is guaranteed.
Embodiment 2
It is 6.5mm that this implementation, which provides a kind of diameter, the preparation process for the zinc-coated wire that tensile strength is 1960MPa grades,
Detailed process is as follows:
1) high-quality wire rod is selected: the high-carbon pearlite wire rod of selection diameter 14.0mm, main component C:0.91%, Si:
0.38%, Mn:0.70%, wire rod surface quality is good, and abnormal structures, the tensile strength such as martensite-free and bainite are
1410MPa, reduction of area 30%.
2) single pass or the pre- drawing of multi-pass: carrying out pre- drawing process to the wire rod of diameter 14.0mm, using single pass into
Row drawing, single pass reduction ratio are 13.78%, pulling rate are controlled during pre- drawing as 1.2m/s, and temperature before the mould of pre- drawing
It is 30 DEG C, temperature is 125 DEG C after the mould of pre- drawing；Wire rod diameter is 13.0mm after drawing；Also, observe the wire rod after pre- drawing
The continuity that surface is visible by naked eyes scratches, and wire rod ovality is 0.4mm；
3) heat-treated offline, heat-treatment medium heat-treated offline: are carried out to the wire rod that the diameter after pre- drawing is 13.0mm
Lead liquid is selected, the temperature of the austenitizing processing is greater than 950 DEG C, and soaking time is more than 1min；The temperature of Isothermal treatment is
550 DEG C, soaking time 60s, the wire rod interior tissue after observing heat-treated offline is uniform Soxhlet body tissue, and wire rod
Intensity is no more than 40MPa with circle difference；.
4) throwing obtains finished product zinc-coated wire: successively carrying out pickling, phosphatization, multi-pass cold drawing, hot dip, stabilisation and collection
Volume, in which:
To guarantee that the iron scale on wire rod surface is removed completely during acid washing phosphorization, surface has drawing condition；
Multi-pass cold drawing process uses 6 passages, and temperature is no more than 45 DEG C and 140 respectively before the mould of wire drawing and after mould
DEG C, drawing speed about 2.0m/s；
The medium temperature range of hot dip process is 445~455 DEG C, and hot dip speed is no more than 12m/min；
Heating temperature is no more than 420 DEG C in stabilization procedures, and pulling rate is lower than 220m/min, and wherein stabilization processes make to prepare
Obtained zinc-coated wire has underrelaxation performance requirement.
It is 6.5mm, zinc-coated wire tensile strength >=2010MPa, twisting property >=21 circles, the galvanized steel that diameter, which is prepared,
Silk meets the requirement of bridge cable zinc-coated wire.
Embodiment 3
It is 5.5mm that this implementation, which provides a kind of diameter, the preparation process for the zinc-coated wire that tensile strength is 1860MPa grades,
Detailed process is as follows:
1) high-quality wire rod is selected: the high-carbon pearlite wire rod of selection diameter 14.0mm, main component C:0.83%, Si:
0.21%, Mn:0.75%, wire rod surface quality is good, and abnormal structures, the tensile strength such as martensite-free and bainite are
1340MPa, reduction of area 35%.
2) single pass or the pre- drawing of multi-pass: carrying out pre- drawing process to the wire rod of diameter 14.0mm, using two passages into
Row drawing, wire rod diameter is 12.60mm after the first passage drawing, and the first passage and the second percentage pass reduction are respectively 19.0% He
9.30%, guarantee whole drafts >=12% of pre- drawing；Pulling rate is controlled during pre- drawing as 1.0m/s, and the mould of pre- drawing
Preceding temperature is 35 DEG C, and temperature is 120 DEG C after the mould of pre- drawing；Wire rod diameter is 12.0mm after drawing；Also, after observing pre- drawing
The continuity that is visible by naked eyes of wire rod surface scratch, wire rod ovality is 0.30mm.
3) heat-treated offline, heat-treatment medium heat-treated offline: are carried out to the wire rod that the diameter after pre- drawing is 12.0mm
Lead liquid is selected, the temperature of the austenitizing processing is 1000 DEG C, soaking time 1.5min；The temperature of Isothermal treatment is
550 DEG C, soaking time 70s, the wire rod interior tissue after observing heat-treated offline is uniform Soxhlet body tissue, and wire rod
Intensity is no more than 40MPa with circle difference；
4) throwing obtains finished product zinc-coated wire: successively carrying out pickling, phosphatization, multi-pass cold drawing, hot dip, stabilisation and collection
Volume, in which:
To guarantee that the iron scale on wire rod surface is removed completely during acid washing phosphorization, surface has drawing condition；
Multi-pass cold drawing process uses 8 passages, and temperature is no more than 45 DEG C and 140 respectively before the mould of wire drawing and after mould
DEG C, drawing speed about 1.5m/s；
The medium temperature range of hot dip process is 450~460 DEG C, and hot dip speed is no more than 12m/min；
Heating temperature is no more than 420 DEG C in stabilization procedures, and pulling rate is lower than 220m/min, and wherein stabilization processes make to prepare
Obtained zinc-coated wire has underrelaxation performance requirement.
It is 5.5mm, zinc-coated wire tensile strength >=1915MPa, twisting property >=25 circles, the galvanized steel that diameter, which is prepared,
Silk meets the requirement of bridge cable zinc-coated wire.
Embodiment 4
It is 7.0mm that this implementation, which provides a kind of diameter, the preparation process for the zinc-coated wire that tensile strength is 1860MPa grades,
Detailed process is as follows:
1) high-quality wire rod is selected: the high-carbon pearlite wire rod of selection diameter 16.0mm, main component C:0.80%, Si:
0.21%, Mn:0.55%, wire rod surface quality is good, and abnormal structures, the tensile strength such as martensite-free and bainite are
1260MPa, reduction of area 36%.
2) single pass or the pre- drawing of multi-pass: carrying out pre- drawing process to the wire rod of diameter 16.0mm, using two passages into
Row drawing, wire rod diameter is 14.80mm after the first passage drawing, and the first passage and the second percentage pass reduction are respectively 14.43%
With 10.52%, guarantee whole drafts >=12% of pre- drawing；Pulling rate is controlled during pre- drawing as 1.5m/s, and pre- drawing
Mould before temperature be 40 DEG C, temperature is 130 DEG C after the mould of pre- drawing；Wire rod diameter is 14.0mm after drawing；Also, observe prestretching
The continuity that wire rod surface after pulling out is visible by naked eyes scratches, and wire rod ovality is 0.35mm；
3) heat-treated offline, heat-treatment medium heat-treated offline: are carried out to the wire rod that the diameter after pre- drawing is 14.0mm
Lead liquid is selected, the temperature of the austenitizing processing is greater than 950 DEG C, and soaking time is more than 1min；The temperature of Isothermal treatment is
500 DEG C, soaking time 60s, the wire rod interior tissue after observing heat-treated offline is uniform Soxhlet body tissue, and wire rod
Intensity is no more than 40MPa with circle difference；
4) throwing obtains finished product zinc-coated wire: successively carrying out pickling, phosphatization, multi-pass cold drawing, hot dip, stabilisation and collection
Volume, in which:
To guarantee that the iron scale on wire rod surface is removed completely during acid washing phosphorization, surface has drawing condition；
Multi-pass cold drawing process uses 7 passages, and temperature is no more than 45 DEG C and 140 respectively before the mould of wire drawing and after mould
DEG C, drawing speed about 1.5m/s；
The medium temperature range of hot dip process is 440~470 DEG C, and hot dip speed is no more than 12m/min；
Heating temperature is no more than 420 DEG C in stabilization procedures, and pulling rate is lower than 220m/min, and wherein stabilization processes make to prepare
Obtained zinc-coated wire has underrelaxation performance requirement.
It is 7.0mm, zinc-coated wire tensile strength >=1890MPa, twisting property >=23 circles, the galvanized steel that diameter, which is prepared,
Silk meets the requirement of bridge cable zinc-coated wire.
As can be seen from the above embodiments, the zinc-coated wire diameter that the present invention is prepared be 5.0~7.5mm, tensile strength >=
1860MPa, number of torsions >=18 time in twisting property, that is, have both excellent tensile strength and twisting property.
As well known to a person skilled in the art intensity of steel wire can generally reduce its twisting property while rising, therefore
The product bigger for intensity, the general control difficulty of twisting property is also bigger, main reasons is that intensity is bigger, more holds
It is also easy to produce element segregation, the uniformity of product itself is poorer, and stress concentration is easy to produce in twist process, and then causes to turn round
Turn penalty.The application overcomes this problem, on the basis of guaranteeing tensile strength, mainly in the torsion of steel wire
It can be carried out improvement, by carrying out drawing before heat-treated offline, energy be implanted into, so that the tissue of material during heat treatment
Transformation is more violent, and the tissue after transformation is more uniform, therefore steel wire torsion performance is more excellent.Therefore, the application is prepared
Zinc-coated wire meets bridge rope service demand, meets the demand for development of Longspan Bridge.
Above embodiments are only best citing, rather than a limitation of the embodiments of the present invention.Except above-described embodiment
Outside, there are also other embodiments by the present invention.All technical solutions formed using equivalent substitution or equivalent transformation, all fall within the present invention
It is required that protection scope.
Claims (7)
1. a kind of preparation process of high-intensitive high torsion bridge rope zinc-coated wire, characterized by the following steps:
1) high-carbon pearlite wire rod is selected；
2) reduction ratio≤20% of the pre- drawing of each passage, the preceding road of the pre- drawing of multi-pass single pass or the pre- drawing of multi-pass: are controlled
Secondary reduction ratio is greater than rear percentage pass reduction, guarantees whole drafts >=12% of pre- drawing；Control during pre- drawing pulling rate≤
1.5m/s, and temperature is no more than 40 DEG C before the mould of pre- drawing, temperature is no more than 130 DEG C after the mould of pre- drawing；After guaranteeing pre- drawing
The surface microhardness of wire rod includes deformation pearlite, does not contain martensite or bainite abnormal structure；
3) heat-treated offline: the wire rod that step 2) obtains is carried out at austenitizing using one of salt bath, lead bath or water-bath
Reason and Isothermal treatment；The temperature of the austenitizing processing is greater than 950 DEG C, and soaking time is more than 1min；Isothermal treatment
Temperature is 450~600 DEG C, and soaking time is greater than 50s；
4) technology for making tobacco threds handles to obtain finished product zinc-coated wire.
2. the preparation process of high-intensitive high torsion bridge rope zinc-coated wire according to claim 1, it is characterised in that: step 2)
In, the continuity that the wire rod surface after pre- drawing is visible by naked eyes scratches or scratch depth is no more than 0.10mm, and wire rod is oval
Degree is no more than 0.4mm.
3. the preparation process of high-intensitive high torsion bridge rope zinc-coated wire according to claim 1, it is characterised in that: step 3)
In, the surface microhardness of wire rod is uniform Soxhlet body tissue after the heat-treated offline, and the intensity of wire rod is poor not with circle
More than 40MPa.
4. the preparation process of high-intensitive high torsion bridge rope zinc-coated wire according to claim 1, it is characterised in that: step 1)
In, the high-carbon pearlite wire rod includes following each component: C >=0.77% according to mass percent, Si:0.2~1.1%, Mn:
0.3~0.9%.
5. the preparation process of high-intensitive high torsion bridge rope zinc-coated wire according to claim 4, it is characterised in that: the height
The surface microhardness of carbon pearlite wire rod is martensite-free and bainite structure, tensile strength control are 1100~1600MPa, face
Contracting is not less than 30%.
6. the preparation process of the according to claim 1 or 2 or 3 or 4 or 5 high-intensitive high torsion bridge rope zinc-coated wires, special
Sign is: in step 4), the technology for making tobacco threds successively includes pickling, phosphatization, multi-pass cold drawing, hot dip, stabilisation and collection volume.
7. a kind of high torsion bridge rope zinc-coated wire of the high intensity that preparation process described in claim 1 is prepared, feature
Be: its diameter is 5.0~7.5mm, tensile strength >=1860MPa, number of torsions >=18 time in twisting property.
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| CN112246901B (en) * | 2020-09-17 | 2022-09-27 | 武汉钢铁有限公司 | Production method of high-torsion coating steel wire for cable |
| CN112301287B (en) * | 2020-11-09 | 2022-06-21 | 江苏省沙钢钢铁研究院有限公司 | Prestressed steel strand, wire rod for prestressed steel strand and production method of wire rod |
| CN112958647B (en) * | 2021-02-01 | 2022-05-24 | 江阴市钧益特种钢丝科技有限公司 | Drawing process of high-elasticity high-nickel alloy special-shaped elastic card clothing steel wire |
| CN113337778A (en) * | 2021-05-13 | 2021-09-03 | 东南大学 | Oil well load-bearing detection cable armored steel wire and production method thereof |
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