CN107299280B - 2000MPa grades of cable steel wires heat treatment wire rod and production method - Google Patents
2000MPa grades of cable steel wires heat treatment wire rod and production method Download PDFInfo
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- CN107299280B CN107299280B CN201710721505.0A CN201710721505A CN107299280B CN 107299280 B CN107299280 B CN 107299280B CN 201710721505 A CN201710721505 A CN 201710721505A CN 107299280 B CN107299280 B CN 107299280B
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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
-
- 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
- C21D1/18—Hardening; Quenching with or without subsequent tempering
- C21D1/19—Hardening; Quenching with or without subsequent tempering by interrupted quenching
- C21D1/20—Isothermal quenching, e.g. bainitic hardening
-
- 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
- C21D1/56—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering characterised by the quenching agents
- C21D1/607—Molten salts
-
- 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
-
- 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
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- 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
Abstract
The present invention proposes that a kind of 2000MPa grades of cable steel wire is heat-treated wire rod and production method, the weight percentage of ingredient are as follows: C 0.85 ~ 1.0%；Si:0.80 ~ 1.5%；Mn 0.30~0.80%；Cr 0.20~0.80%；P ≤0.015%；S ≤0.010%；Al 0.01 ~ 0.08%, remaining is Fe and inevitable impurity.The present invention is produced by the special designing of ingredient by smelting-continuous casting-slab reconditioning-steel rolling-heat-treated offline technique, and gained wire rod sorbite rate is more than 95%, even tissue, the quenching structures such as no net carbide and martensite.Gained wire rod is after drawing, zinc-plated (aluminium), stabilization processes, intensity of steel wire >=2000MPa, can be used for producing zinc-plated (aluminium) steel wire of 2000MPa rank bridge cable, the bridge required suitable for super-large span, superhigh intensity.
Description
Technical field
The invention belongs to metal wire rod manufacturing technology field more particularly to a kind of 2000MPa grades of cable be zinc-plated or aluminum-plated steel
Silk heat treatment wire rod and production method.
Background technique
In recent years with the demand of our national economic developments, traffic base builds more and more prosperous, super-span suspension bridge beam
Quantity rapidly increases.With the increase of span and lane quantity, the main push-towing rope steel wire of domestic and international suspension bridge has been in superhigh intensity hair
Exhibition stage, the tensile strength that steel wire is continuously improved become the development trend of bridge cable.The tensile strength of bridge main push-towing rope steel wire compared with
It maintains between 1570 MPa~1670MPa for a long time, moves quickly through 1770MPa and 1860MPa rank in recent years,
The 2000MPa grades of developing direction for becoming current world's bridge main push-towing rope steel wire.
Zinc-coated wire wire rod component system and manufacturing method can only meet 1860MPa rank bridge cable galvanized steel at present
The silk production of wire rod, such as CN2012101325872.To further increase the intensity of wire rod to meet higher intensity rank steel wire
Requirement, generally use at present improve wire rod chemical component in C, N element content while the side for adding the microalloy elements such as V, Al
Method.Although this method can improve the intensity of wire rod, due to uncontrollable etc. in the cold precipitation particles in the process of wire rod controlled rolling control
Reason causes the twisting property of steel wire product to be unable to satisfy requirement.Therefore, (microalloy member is not added in component system adjustment
Element reduces C element content as far as possible simultaneously) on the basis of, it is production 2000MPa to the method that gren rod uses Isothermal treatment
Bridge cable is zinc-plated or the only way which must be passed of aluminium plated steel wire wire rod for grade.
Summary of the invention
The technology that the present invention is difficult to reach 2000MPa intensity rank for existing heat treatment wire rod and production technology is asked
Topic proposes a kind of zinc-plated 2000MPa grade cable of high-strength and high-plasticity or aluminium plated steel wire heat treatment wire rod ingredient and processing work
Skill.
In order to achieve the above object, the technical solution adopted by the present invention are as follows:
A kind of 2000MPa grades of cable steel wire heat treatment wire rod, the weight percentage of ingredient are as follows: C 0.85 ~ 1.0%；
Si 0.80~1.5%；Mn 0.30~0.80%；Cr 0.20~0.80%；P ≤0.015%；S ≤0.010%；Al 0.01 ~ 0.08%,
Remaining is Fe and inevitable impurity.
Preferably, the weight percentage of its ingredient are as follows: C 0.92 ~ 1.0%；Si 1.05~1.50%；Mn 0.30~
0.55%；Cr 0.45~0.80%；P ≤0.010%；S ≤0.010%；Al 0.05 ~ 0.08%, remaining is for Fe and inevitably
Impurity.
Preferably, the weight percentage of its ingredient are as follows: C 0.92 ~ 1.0%；Si 1.80~0.95%；Mn 0.55~
0.80%；Cr 0.38~0.80%；P ≤0.015%；S ≤0.010%；Al 0.01 ~ 0.08%, remaining is for Fe and inevitably
Impurity.
Preferably, the specification of the wire rod is 12.0 ~ Φ of Φ 16.0mm.
Preferably, the weight percentage of its ingredient are as follows: C 0.93%；Si 1.24%；Mn 0.56%；Cr 0.36%；P
0.011%；S 0.002%；Al 0.074%, remaining is Fe and inevitable impurity.
The present invention also proposes a kind of 2000MPa grades of cable steel wire heat treatment Production method for wire rod, comprising the following steps:
(1) it smelts
By raw material through blast-melted → KR desulfurization → top and bottom combined blown converter steelmaking → LF furnace refining → RH furnace refinement step smelting
Refining, wherein top and bottom combined blown converter steelmaking is blown using double slag process, and LF furnace, which refines, uses aluminium deoxidation and high alkalinity slag system, at RH vacuum
Manage time >=25min；
(2) continuous casting
Continuous casting step is cast using whole process protection, avoids secondary oxidation of steel, the degree of superheat control of molten steel in continuous casting process
At 16 ~ 25 DEG C；
(3) slab reconditioning
Continuous casting billet is spare after ball blast, flaw detection, reconditioning；
(5) steel rolling
It is rolled using one-heating forming technique, 1000 ~ 1200 DEG C of continuous blank heating temperature, keeps the temperature open rolling after 1 ~ 3h, rolling speed
30 ~ 50m/s is spent, process temperature and laying temperature control carry out control cooling using blower after spinning at 850 ~ 950 DEG C.
(6) heat-treated offline
, through austenitizing heating, isothermal salt bath, cleaning, take-up, heat treatment wire rod, Ovshinsky will be obtained after gren rod unwrapping wire
880 ~ 980 DEG C of body heating temperature, 10 ~ 18min of soaking time, 520 ~ 600 DEG C of isothermal salt bath, 3 ~ 6min of soaking time.
Preferably, controlling component segregation of continuous casting slab using electromagnetic agitation, automatic distribution water and slighter compress in continuous casting step, even
Slab is segregated index 1.10.
Preferably, being situated between using the mixed melting salt of potassium nitrate and sodium nitrate as quenching in the isothermal salt bath step
Matter.
Compared with prior art, the advantages and positive effects of the present invention are:
By the special designing of ingredient, and through the invention, wire rod sorbite rate obtained by the production method is more than 95%,
Sorbite piece 80 ~ 100nm of interlamellar spacing, 8 ~ 10 grades of the pearlite colony, 9 ~ 11 grades of autstenitic grain size, even tissue, no reticulated carbon
The quenching structures such as compound and martensite finally improve the mechanical property and poker uniformity of wire rod.Gained wire rod is through drawing, plating
After zinc (aluminium), stabilization processes, intensity of steel wire >=2000MPa reverses index >=20 time, can be used for producing 2000MPa rank bridge
Zinc-plated (aluminium) steel wire of beam cable, the bridge required suitable for super-large span, superhigh intensity.
Specific embodiment
In order to better understand the present invention, it is illustrated below with reference to embodiment.
Embodiment:
In ingredient design of the invention:
C: being to guarantee the chemical element of wire rod intensity and tissue, while to obtain uniform Soxhlet body tissue and higher
Intensity, carbon content be not less than 0.87wt.%, while for control continuous casting slab segregation and improve wire rod toughness plasticity, should not be greater than
1.0wt.%。
Si: existing in the form of being dissolved in steel has extremely strong invigoration effect, while Si has the formation for inhibiting cementite
Si with the effect of loss of strength during reduction wire galvanization (aluminium), therefore 0.80 ~ 1.5wt.% of addition is to guarantee wire rod intensity
Important means.
The harden ability of steel and the stability of austenite can be improved in Mn, Cr, can refine wire rod tissue and lamellar structure.
Al is effective deoxidant element, dispersed and tiny aluminium oxide and thinning microstructure, but coarse aluminium oxide can seriously drop
Main frame item and zinc-coated wire drawing and fatigue behaviour.
P, S belongs to harmful element in bridge cable zinc-coated wire wire rod, should be controlled.
Based on above-mentioned, 2000MPa grades of cable steel wire wire rod chemical component of the present invention is shown in Table 1.
Chemical component/wt.% of 1 embodiment wire rod of table
| Embodiment | C | Si | Mn | P | S | Al | Cr |
| 1 | 0.87 | 1.00 | 0.61 | 0.015 | 0.001 | 0.052 | 0.31 |
| 2 | 0.93 | 1.24 | 0.56 | 0.011 | 0.002 | 0.074 | 0.36 |
Above-mentioned Production method for wire rod is as follows:
(1) it smelts
The step of raw material is refined through blast-melted → KR desulfurization → top and bottom combined blown converter steelmaking → LF furnace refining → RH furnace
It is smelted.It is blast-melted after KR desulfurization, into molten iron S constituent content≤0.005% of converter.Converter is blown using double slag process
Refining, can reduce the impurity content in molten steel, converter terminal P element content≤0.015%, S constituent content≤0.010%；LF
Furnace uses aluminium deoxidation and high alkalinity slag system, reduces the balance oxygen content in molten steel；The RH application of vacuum time >=25min controls steel
Middle O content≤15ppm, N content≤55ppm.
(2) continuous casting
Continuous casting step is cast using whole process protection, avoids secondary oxidation of steel, the final the amount of inclusions for reducing continuous casting billet.
The degree of superheat of molten steel is controlled at 16 ~ 25 DEG C in continuous casting process, and controls continuous casting billet using electromagnetic agitation, automatic distribution water and slighter compress
Component segregation, continuous casting slab segregation index 1.10.
(3) slab reconditioning
Continuous casting billet will carry out ball blast, flaw detection, carry out reconditioning according to continuous casting billet surface appearance, the casting billet surface after reconditioning cannot
Jagged and sharp corners prevent the surface defect of continuous casting billet from influencing wire rod surface quality.
(5) steel rolling
It is become a useful person using the rolling of one-heating forming technique.1000 ~ 1200 DEG C of continuous blank heating temperature, open rolling after 1 ~ 3h is kept the temperature, is rolled
30 ~ 50m/s of speed processed, process temperature and laying temperature control carry out control cooling using blower after spinning at 850 ~ 950 DEG C.
Continuous casting billet is heated to 1000 ~ 1200 DEG C, 1 ~ 3h of soaking time, controls furnace atmosphere to mitigate skin decarburization；Continuous casting billet is come out of the stove
Laggard horizontal high voltage water dephosphorization, it is ensured that remove iron scale；Process temperature and laying temperature control are at 850 ~ 950 DEG C, rolling speed
20 ~ 50m/s is spent, wire rod rationally cools down after spinning, controls cooling rate and outlet temperature, avoids having an impact the net carbon used and geneva
Body tissue.It is cold by the temperature control control of the operation of rolling, the crystallite dimension of wire rod microscopic structure is controlled, ideal sorbite group is obtained
It knits, reduces crystal boundary cementite rank, avoid the generation of the harmful structures such as martensite.
(6) heat-treated offline
Gren rod enters heating furnace progress austenitizing heating after uncoiling, isothermal salt bath sorbitizing handles, is clear
Washing machine cleaning is finally collected coiled.880 ~ 980 DEG C, 10 ~ 18min of soaking time of wire rod austenitizing heating temperature, guarantee abundant
Austenitizing simultaneously controls austenite grain size；535 ~ 600 DEG C of wire rod salt temperature, 3 ~ 6min of soaking time, guarantee austenite
Tissue is completely transformed into the Soxhlet body tissue of fine uniform, excellent microscopic structure guarantee wire rod have good mechanical property and
Drawing processing performance.
Embodiment 1, the mechanical property of 2000MPa grades of cable zinc/aluminum-plated steel-wire wire rods of 2 gained are shown in Table 2.
Embodiment 1,2 wire rods are after drawing, plating zinc-aluminium, stabilization processes, specification, tensile strength and the torsion of obtained steel wire
Turn index and is shown in Table 3.
Specification, microscopic structure and the mechanical property of 2 embodiment wire rod of table
| Embodiment | Specification | Sorbite rate | Tensile strength | The contraction percentage of area |
| 1 | Φ13mm | 97% | 1458 MPa | 36% |
| 2 | Φ14mm | 97% | 1562 MPa | 30% |
3 embodiment finished product wire gauge of table and mechanical property
| Embodiment | Specification | Tensile strength | Number of torsions |
| 1 | Φ5.0mm | 2045 MPa | 20 times |
| 2 | Φ7.0mm | 2050 MPa | 21 times |
In conjunction with table 2, table 3 experimental result as it can be seen that wire rod sorbite rate obtained by the production method through this embodiment
More than 95%, sorbite piece 80 ~ 100nm of interlamellar spacing, 8 ~ 10 grades of the pearlite colony, 9 ~ 11 grades of autstenitic grain size, even tissue,
Without the quenching structures such as net carbide and martensite, the mechanical property and poker uniformity of wire rod are finally improved.Gained wire rod
After drawing, zinc-plated (aluminium), stabilization processes, intensity of steel wire >=2000MPa reverses index >=20 time, can be used for producing
Zinc-plated (aluminium) steel wire of 2000MPa rank bridge cable, the bridge required suitable for super-large span, superhigh intensity.
The above described is only a preferred embodiment of the present invention, being not that the invention has other forms of limitations, appoint
What those skilled in the art changed or be modified as possibly also with the technology contents of the disclosure above equivalent variations etc.
It imitates embodiment and is applied to other fields, but without departing from the technical solutions of the present invention, according to the technical essence of the invention
Any simple modification, equivalent variations and remodeling to the above embodiments, still fall within the protection scope of technical solution of the present invention.
Claims (7)
1. a kind of 2000MPa grades of cable steel wire heat treatment wire rod, which is characterized in that the weight percentage of its ingredient are as follows: C
0.85~1.0%；Si:0.80~1.5%；Mn 0.30~0.80%；Cr 0.20~0.80%；P≤0.015%；S≤
0.010%；Al 0.01~0.08%, remaining is Fe and inevitable impurity；It is process by following steps:
(1) it smelts
Raw material is smelted through blast-melted → KR desulfurization → top and bottom combined blown converter steelmaking → LF furnace refining → RH furnace refinement step,
Middle top and bottom combined blown converter steelmaking is blown using double slag process, and the refining of LF furnace uses aluminium deoxidation and high alkalinity slag system, when RH application of vacuum
Between >=25min；
(2) continuous casting
Continuous casting step is cast using whole process protection, avoids secondary oxidation of steel, and the degree of superheat of molten steel is controlled 16 in continuous casting process
~25 DEG C；
(3) slab reconditioning
Continuous casting billet is spare after ball blast, flaw detection, reconditioning；
(5) steel rolling
It is rolled using one-heating forming technique, 1000~1200 DEG C of continuous blank heating temperature, keeps the temperature open rolling after 1~3h, mill speed
30~50m/s, process temperature and laying temperature control carry out control cooling using blower after spinning at 850~950 DEG C；
(6) heat-treated offline
, through austenitizing heating, isothermal salt bath, cleaning, take-up, heat treatment wire rod, austenitizing will be obtained after gren rod unwrapping wire
880~980 DEG C of heating temperature, 10~18min of soaking time, 520~600 DEG C of isothermal salt bath, 3~6min of soaking time.
2. 2000MPa grades of cable steel wire according to claim 1 heat treatment wire rod, which is characterized in that the weight of its ingredient
Measure percentage composition are as follows: C 0.92~1.0%；Si:1.05~1.50%；Mn 0.30~0.55%；Cr 0.45~0.80%；P
≤ 0.010%；S≤0.010%；Al 0.05~0.08%, remaining is Fe and inevitable impurity.
3. 2000MPa grades of cable steel wire according to claim 1 heat treatment wire rod, which is characterized in that the weight of its ingredient
Measure percentage composition are as follows: C 0.92~1.0%；Si:0.95~1.80%；Mn 0.55~0.80%；Cr 0.38~0.80%；P
≤ 0.015%；S≤0.010%；Al 0.01~0.08%, remaining is Fe and inevitable impurity.
4. 2000MPa grades of cable steel wire according to claim 3 heat treatment wire rod, it is characterised in that: the wire rod
Specification is 12.0~Φ of Φ 16.0mm.
5. 2000MPa grades of cable steel wire according to claim 1 heat treatment wire rod, it is characterised in that: the weight of its ingredient
Measure percentage composition are as follows: C 0.93%；Si1.24%；Mn 0.56%；Cr 0.36%；P 0.011%；S 0.002%；Al
0.074%, remaining is Fe and inevitable impurity.
6. 2000MPa grades of cable steel wire according to claim 1 heat treatment wire rod, it is characterised in that: in continuous casting step
Component segregation of continuous casting slab, continuous casting slab segregation index 1.10 are controlled using electromagnetic agitation, automatic distribution water and slighter compress.
7. 2000MPa grades of cable steel wire according to claim 6 heat treatment wire rod, it is characterised in that: described to wait thermohalines
It bathes in step using the mixed melting salt of potassium nitrate and sodium nitrate as hardening media.
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| CN105671443A (en) * | 2016-02-25 | 2016-06-15 | 邢台钢铁有限责任公司 | Hot-rolled wire rod for 1,960MPa-level cable rope galvanized steel wire and production method |
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| CN107299280A (en) | 2017-10-27 |
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