CN107299280A - 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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- CN107299280A CN107299280A CN201710721505.0A CN201710721505A CN107299280A CN 107299280 A CN107299280 A CN 107299280A CN 201710721505 A CN201710721505 A CN 201710721505A CN 107299280 A CN107299280 A CN 107299280A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- 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
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- 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
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- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
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- Crystallography & Structural Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The present invention proposes a kind of 2000MPa grades of cable steel wire heat treatment wire rod and production method, and the weight percentage of its composition is：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.Particular design of the invention by composition, and produced by smelting continuous-cast blank reconditioning steel rolling heat-treated offline technique, gained wire rod sorbitic rate is more than 95%, even tissue, the quenching structure such as no net carbide and martensite.Gained wire rod is through drawing, zinc-plated（Aluminium）, after stabilization processes, intensity of steel wire >=2000MPa is zinc-plated available for production 2000MPa rank bridge cables（Aluminium）Steel wire, it is adaptable to super-large span, the bridge of superhigh intensity requirement.
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 technology
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 track quantity, the main push-towing rope steel wire of domestic and international suspension bridge is sent out in superhigh intensity
In the exhibition stage, improving constantly the tensile strength of steel wire turns into the development trend of bridge cable.The tensile strength of bridge main push-towing rope steel wire compared with
Maintain for a long time between 1570 MPa~1670MPa, 1770MPa and 1860MPa ranks moved quickly through in recent years,
2000MPa grades become the developing direction of current world's bridge main push-towing rope steel wire.
Current zinc-coated wire wire rod component system and manufacture method can only meet 1860MPa rank bridge cable galvanized steels
The production of silk wire rod, such as CN2012101325872.Further to improve the intensity of wire rod to meet higher intensity rank steel wire
Requirement, generally add the sides of the microalloy elements such as V, Al simultaneously using improving C, N element content in wire rod chemical composition at present
Method.Although this method can improve the intensity of wire rod, because precipitation particles is difficult to control to during wire rod controlled rolling control is cold
Reason causes the twisting property of steel wire product can not meet use requirement.Therefore, adjusted in component system（Without microalloy member
Element reduces C element content as far as possible simultaneously）On the basis of, it is production 2000MPa that the method for Isothermal treatment is used to gren rod
Level bridge cable is zinc-plated or the only way which must be passed of aluminium plated steel wire wire rod.
The content of the invention
The present invention is difficult to reach that the technology of 2000MPa intensity ranks is asked for existing heat treatment wire rod and production technology
Topic, proposes that a kind of 2000MPa level cables of high-strength high-plasticity are zinc-plated or aluminium plated steel wire uses heat treatment wire rod composition and processes work
Skill.
In order to achieve the above object, the technical solution adopted by the present invention is：
A kind of 2000MPa grades of cable steel wire, which is used, is heat-treated wire rod, and the weight percentage of its composition is：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%, its
Remaining is Fe and inevitable impurity.
Preferably, the weight percentage of its composition is：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.
Preferably, the weight percentage of its composition is：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 Fe and inevitable
Impurity.
Preferably, the specification of the wire rod is 12.0 ~ Φ of Φ 16.0mm.
Preferably, the weight percentage of its composition is：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, comprises the following steps：
（1）Smelt
Raw material is smelted through blast-melted → KR desulfurization → top and bottom combined blown converter steelmaking → LF stoves refining → RH stoves refinement step, its
Middle top and bottom combined blown converter steelmaking is blown using double slag process, and the refining of LF stoves uses aluminium deoxidation and high alkalinity slag system, during RH application of vacuum
Between >=25min；
（2）Continuous casting
Continuous casting step is cast using whole process protection, it is to avoid in secondary oxidation of steel, casting process the degree of superheat control of molten steel 16 ~
25℃；
（3）Strand reconditioning
By continuous casting billet after ball blast, flaw detection, reconditioning it is standby；
（5）Steel rolling
Rolled using one-heating forming technique, 1000 ~ 1200 DEG C of continuous blank heating temperature, open rolling after 1 ~ 3h of insulation, mill speed 30 ~
50m/s, process temperature and laying temperature control are controlled cooling after spinning at 850 ~ 950 DEG C using blower fan.
（6）Heat-treated offline
To be heated after gren rod unwrapping wire through austenitizing, isothermal salt bath, cleaning, take-up, obtain be heat-treated wire rod, austenitizing
880 ~ 980 DEG C of heating-up temperature, 10 ~ 18min of soaking time, 520 ~ 600 DEG C of isothermal salt bath, 3 ~ 6min of soaking time.
Preferably, being connected in continuous casting step using electromagnetic agitation, automatic distribution water and slighter compress control component segregation of continuous casting slab
Strand segregation index 1.10.
Preferably, being situated between in the isothermal salt bath step using the mixed melting salt of potassium nitrate and sodium nitrate as quenching
Matter.
Compared with prior art, advantages and positive effects of the present invention are：
By the particular design of composition, and as obtained by production method of the present invention, wire rod sorbitic rate is more than 95%, Soxhlet
Body piece 80 ~ 100nm of interlamellar spacing, 8 ~ 10 grades of the pearlite colony, 9 ~ 11 grades of autstenitic grain size, even tissue, no net carbide
With the quenching structure such as martensite, the mechanical property and poker uniformity of wire rod are finally improved.Gained wire rod is through drawing, zinc-plated
（Aluminium）, after stabilization processes, intensity of steel wire >=2000MPa reverses index >=20 time, available for production 2000MPa rank bridges
Cable is zinc-plated（Aluminium）Steel wire, it is adaptable to super-large span, the bridge of superhigh intensity requirement.
Embodiment
In order to be better understood from the present invention, illustrated with reference to embodiment.
Embodiment：
In the composition design of the present invention：
C：It is the chemical element for ensureing wire rod intensity and tissue, while to obtain the sorbite tissue of uniformity and higher strong
Degree, carbon content is not less than 0.87wt.%, while for control continuous casting slab segregation and improving wire rod toughness plasticity, should not be greater than 1.0wt.%.
Si：Existing in steel with solid solution form has extremely strong invigoration effect, while Si has the formation for suppressing cementite
With reduction wire galvanization（Aluminium）During loss of strength effect, therefore addition 0.80 ~ 1.5wt.% Si be ensure wire rod intensity
Important means.
Mn, Cr can improve the quenching degree of steel and the stability of austenite, can refine wire rod tissue and lamellar structure.
Al is that effective deoxidant element, disperse tiny aluminum oxide and thinning microstructure, but thick aluminum oxide can seriously drop
Main frame bar and zinc-coated wire drawing and fatigue behaviour.
P, S belong to harmful element in bridge cable zinc-coated wire wire rod, should be controlled by.
Based on above-mentioned, 2000MPa grades of cable steel wire wire rod chemical composition of the present invention is shown in Table 1.
Chemical composition/wt.% of the embodiment wire rod of table 1
| 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）Smelt
The step of raw material is refined through blast-melted → KR desulfurization → top and bottom combined blown converter steelmaking → LF stoves refining → RH stoves is carried out
Smelt.After the blast-melted desulfurization through KR, into molten iron S constituent content≤0.005% of converter.Converter is blown using double slag process, can
Reduce the impurity content in molten steel, converter terminal P element content≤0.015%, S constituent content≤0.010%；LF stoves are used
Balance oxygen content in aluminium deoxidation and high alkalinity slag system, reduction molten steel；O content in RH application of vacuum time >=25min, control steel
≤ 15ppm, N content≤55ppm.
（2）Continuous casting
Continuous casting step is cast using whole process protection, it is to avoid secondary oxidation of steel, the amount of inclusions of final reduction continuous casting billet.Continuous casting
During molten steel the degree of superheat control at 16 ~ 25 DEG C, and using electromagnetic agitation, automatic distribution water and slighter compress control continuous casting billet composition
Segregation, continuous casting slab segregation index 1.10.
（3）Strand reconditioning
Continuous casting billet will carry out ball blast, flaw detection, and reconditioning is carried out according to continuous casting billet surface appearance, and the casting billet surface after reconditioning is unable to hairiness
Thorn and sharp corners, preventing the surface defect of continuous casting billet influences wire rod surface quality.
（5）Steel rolling
Become a useful person using the rolling of one-heating forming technique.Open rolling after 1000 ~ 1200 DEG C of continuous blank heating temperature, 1 ~ 3h of insulation, rolling speed
30 ~ 50m/s is spent, process temperature and laying temperature control are controlled cooling after spinning at 850 ~ 950 DEG C using blower fan.Continuous casting
Base is heated to 1000 ~ 1200 DEG C, and 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 at 850 ~ 950 DEG C, mill speed 20 ~
Wire rod is rationally cooled down after 50m/s, spinning, control cooling rate and outlet temperature, it is to avoid produce net carbon and martensite group that influence is used
Knit.It is cold by the temperature control control of the operation of rolling, the crystallite dimension of wire rod microscopic structure is controlled, preferable sorbite tissue, drop is obtained
Low crystal boundary cementite rank, it is to avoid the generation of the harmful structure such as martensite.
（6）Heat-treated offline
Gren rod enters heating furnace after uncoiling and carries out austenitizing heating, the processing of isothermal salt bath sorbitizing, cleaning machine
Cleaning, is finally collected coiled.880 ~ 980 DEG C of wire rod austenitizing heating-up temperature, 10 ~ 18min of soaking time, it is ensured that abundant Ovshinsky
Body simultaneously controls austenite grain size；535 ~ 600 DEG C of wire rod salt temperature, 3 ~ 6min of soaking time, it is ensured that austenite structure
It is completely transformed into the sorbite tissue of fine uniform, excellent microscopic structure ensures that wire rod has good mechanical property and drawing
Processing characteristics.
Embodiment 1,2000MPa grades of cable zinc/aluminum-plated steel-wires of 2 gained are shown in Table 2 with the mechanical property of wire rod.
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 be shown in Table 3.
Specification, microscopic structure and the mechanical property of the embodiment wire rod of table 2
| Embodiment | Specification | Sorbitic rate | Tensile strength | The contraction percentage of area |
| 1 | Φ13mm | 97% | 1458 MPa | 36% |
| 2 | Φ14mm | 97% | 1562 MPa | 30% |
The embodiment finished product wire gauge of table 3 and mechanical property
| Embodiment | Specification | Tensile strength | Number of torsions |
| 1 | Φ5.0mm | 2045 MPa | 20 times |
| 2 | Φ7.0mm | 2050 MPa | 21 times |
Experimental result with reference to table 2, table 3 is visible, and wire rod sorbitic rate exceedes as obtained by production method described in the present embodiment
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 net
The quenching structure such as shape carbide and martensite, finally improves the mechanical property and poker uniformity of wire rod.Gained wire rod is through drawing
Pull out, it is zinc-plated（Aluminium）, after stabilization processes, intensity of steel wire >=2000MPa reverses index >=20 time, available for 2000MPa grades of production
Other bridge cable is zinc-plated（Aluminium）Steel wire, it is adaptable to super-large span, the bridge of superhigh intensity requirement.
The above described is only a preferred embodiment of the present invention, being not the limitation for making other forms to the present invention, 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.
Imitate embodiment and be applied to other fields, but every without departing from technical solution of the present invention content, the technical spirit according to the present invention
Any simple modification, equivalent variations and the remodeling made to above example, still fall within the protection domain of technical solution of the present invention.
Claims (8)
1. a kind of 2000MPa grades of cable steel wire heat treatment wire rod, it is characterised in that the weight percentage of its composition is：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.
2. 2000MPa grades of cable steel wire according to claim 1 heat treatment wire rod, it is characterised in that the weight of its composition
Measuring percentage composition is：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 2 heat treatment wire rod, it is characterised in that the weight of its composition
Measuring percentage composition is：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 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 4 heat treatment wire rod, it is characterised in that：The weight of its composition
Measuring percentage composition is：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.
6. a kind of 2000MPa grades of cable steel wire heat treatment Production method for wire rod, it is characterised in that comprise the following steps：
（1）Smelt
Raw material is smelted through blast-melted → KR desulfurization → top and bottom combined blown converter steelmaking → LF stoves refining → RH stoves refinement step, its
Middle top and bottom combined blown converter steelmaking is blown using double slag process, and the refining of LF stoves uses aluminium deoxidation and high alkalinity slag system, during RH application of vacuum
Between >=25min；
（2）Continuous casting
Continuous casting step is cast using whole process protection, it is to avoid in secondary oxidation of steel, casting process the degree of superheat control of molten steel 16 ~
25℃；
（3）Strand reconditioning
By continuous casting billet after ball blast, flaw detection, reconditioning it is standby；
（5）Steel rolling
Rolled using one-heating forming technique, 1000 ~ 1200 DEG C of continuous blank heating temperature, open rolling after 1 ~ 3h of insulation, mill speed 30 ~
50m/s, process temperature and laying temperature control are controlled cooling after spinning at 850 ~ 950 DEG C using blower fan；
（6）Heat-treated offline
To be heated after gren rod unwrapping wire through austenitizing, isothermal salt bath, cleaning, take-up, obtain be heat-treated wire rod, austenitizing
880 ~ 980 DEG C of heating-up temperature, 10 ~ 18min of soaking time, 520 ~ 600 DEG C of isothermal salt bath, 3 ~ 6min of soaking time.
7. 2000MPa grades of cable steel wire according to claim 5 heat treatment Production method for wire rod, it is characterised in that：Even
Cast in step using electromagnetic agitation, automatic distribution water and slighter compress control component segregation of continuous casting slab, continuous casting slab segregation index 1.10.
8. 2000MPa grades of cable steel wire according to claim 6 heat treatment Production method for wire rod, it is characterised in that：Institute
State in isothermal salt bath step using the mixed melting salt of potassium nitrate and sodium nitrate as hardening media.
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| CN115232954A (en) * | 2022-07-27 | 2022-10-25 | 江苏狼山钢绳股份有限公司 | Method for fully sorbitizing large-diameter disc circle |
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