CN114686780A - Steel wire rod for heat-reducing treatment of ultra-fine steel cord and production process - Google Patents
Steel wire rod for heat-reducing treatment of ultra-fine steel cord and production process Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 159
- 239000010959 steel Substances 0.000 title claims abstract description 159
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 claims abstract description 65
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 49
- 239000002893 slag Substances 0.000 claims abstract description 45
- 238000001816 cooling Methods 0.000 claims abstract description 42
- 239000010936 titanium Substances 0.000 claims abstract description 42
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 35
- 238000009749 continuous casting Methods 0.000 claims abstract description 28
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 27
- 239000012535 impurity Substances 0.000 claims abstract description 22
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 21
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 21
- 238000005204 segregation Methods 0.000 claims abstract description 18
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 18
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 18
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 17
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 17
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 17
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 17
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 16
- 229910052802 copper Inorganic materials 0.000 claims abstract description 15
- 229910052742 iron Inorganic materials 0.000 claims abstract description 15
- 229910000519 Ferrosilicon Inorganic materials 0.000 claims abstract description 14
- 238000010438 heat treatment Methods 0.000 claims abstract description 13
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 6
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 4
- 238000005096 rolling process Methods 0.000 claims description 59
- 230000008569 process Effects 0.000 claims description 50
- 238000007670 refining Methods 0.000 claims description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 17
- 238000007664 blowing Methods 0.000 claims description 10
- 238000006477 desulfuration reaction Methods 0.000 claims description 10
- 230000023556 desulfurization Effects 0.000 claims description 10
- 238000003723 Smelting Methods 0.000 claims description 9
- 238000009987 spinning Methods 0.000 claims description 9
- 230000009467 reduction Effects 0.000 claims description 8
- 238000004321 preservation Methods 0.000 claims description 5
- 238000010079 rubber tapping Methods 0.000 claims description 5
- 229910001567 cementite Inorganic materials 0.000 abstract description 8
- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical compound C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 abstract description 8
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 16
- 239000011651 chromium Substances 0.000 description 15
- 239000011572 manganese Substances 0.000 description 14
- 239000010949 copper Substances 0.000 description 13
- 230000000052 comparative effect Effects 0.000 description 12
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 8
- 239000000463 material Substances 0.000 description 8
- 238000012545 processing Methods 0.000 description 6
- 238000005266 casting Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 4
- 235000011941 Tilia x europaea Nutrition 0.000 description 4
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 229910052786 argon Inorganic materials 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 4
- 229910000514 dolomite Inorganic materials 0.000 description 4
- 239000010459 dolomite Substances 0.000 description 4
- 239000004571 lime Substances 0.000 description 4
- 238000004513 sizing Methods 0.000 description 4
- 238000010583 slow cooling Methods 0.000 description 4
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 3
- 239000011574 phosphorus Substances 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- 239000011593 sulfur Substances 0.000 description 3
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 2
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 2
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 239000011733 molybdenum Substances 0.000 description 2
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- FBPFZTCFMRRESA-JGWLITMVSA-N D-glucitol Chemical compound OC[C@H](O)[C@@H](O)[C@H](O)[C@H](O)CO FBPFZTCFMRRESA-JGWLITMVSA-N 0.000 description 1
- 229910000677 High-carbon steel Inorganic materials 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 238000012938 design process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- PYLLWONICXJARP-UHFFFAOYSA-N manganese silicon Chemical compound [Si].[Mn] PYLLWONICXJARP-UHFFFAOYSA-N 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910001562 pearlite Inorganic materials 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
- 229910001845 yogo sapphire Inorganic materials 0.000 description 1
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Classifications
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/22—Controlling or regulating processes or operations for cooling cast stock or mould
- B22D11/225—Controlling or regulating processes or operations for cooling cast stock or mould for secondary cooling
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
-
- 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
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
-
- 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
- C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
-
- 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
-
- 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
- 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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
-
- 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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The invention relates to a steel wire rod for reducing heat treatment of an ultra-fine steel cord and a production process thereof, wherein the steel wire rod comprises the following components in percentage by mass: c: 0.55-0.65%, Mn: 0.40-0.60%, Si: 0.15-0.30%, P is less than or equal to 0.015%, S is less than or equal to 0.010%, Cr is less than or equal to 0.05%, Ni is less than or equal to 0.05%, Cu is less than or equal to 0.05%, Mo is less than or equal to 0.03%, Al is less than or equal to 0.0020%, Ti is less than or equal to 0.0010%, O is less than or equal to 0.0020%, N is less than or equal to 0.0050%, and the balance of Fe and inevitable impurities; the method adopts special molten iron for low-titanium cord steel and special ferrosilicon for low-aluminum and low-titanium to carry out the technological routes of slag changing, constant drawing speed, low superheat degree pouring, strong cooling and low-strength controlled cooling, the dimensional precision of a wire rod reaches C-level precision, the carbon segregation index of a continuous casting billet is within 1.07, the grain boundary cementite of the wire rod is 0 level, the maximum width of longitudinal inclusions of the wire rod is below 15 mu m, the proportion of the longitudinal inclusions with the width less than or equal to 10 mu m is more than 99.5 percent, the tensile strength of the wire rod is reduced, the section shrinkage of the wire rod is improved, the excellent drawing performance is realized, and when the method is used for producing the ultra-fine steel cord, the one-time heat treatment can be reduced, the carbon emission is reduced, the production efficiency is greatly improved, and the production cost is reduced.
Description
Technical Field
The invention belongs to the technical field of steel wire rods, and particularly relates to a steel wire rod for reducing heat treatment of an ultra-fine steel cord and a production process thereof.
Background
The steel cord is a thin-gauge steel strand or rope made of high-quality high-carbon steel and having special purposes. General of
The steel YLX70A wire rod for the ultra-fine steel cord and the production process thereof at least need 2 times of heat treatment, the wire rod has high tensile strength, the wire rod has relatively poor section shrinkage and plasticity, the drawing performance of the steel wire is influenced, inclusions easily cause the risk of drawing and wire breaking, the carbon emission is relatively high, and the production of users is causedLow efficiency, high processing cost and difficult meeting of processing requirements.
Disclosure of Invention
The invention aims to solve at least one of the technical problems to a certain extent, and provides a steel wire rod for reducing heat treatment of an ultra-fine steel cord and a production process thereof.
The technical scheme adopted by the invention for solving the technical problem is as follows:
a steel wire rod for reducing heat treatment of an ultra-fine steel cord comprises the following components in percentage by mass: c: 0.55-0.65%, Mn: 0.40-0.60%, Si: 0.15 to 0.30 percent of the total weight of the alloy, less than or equal to 0.015 percent of P, less than or equal to 0.010 percent of S, less than or equal to 0.05 percent of Cr, less than or equal to 0.05 percent of Ni, less than or equal to 0.05 percent of Cu, less than or equal to 0.03 percent of Mo, less than or equal to 0.0020 percent of Al, less than or equal to 0.0010 percent of Ti, less than or equal to 0.0020 percent of [ O ], and less than or equal to 0.0050 percent of [ N ]; the balance being Fe and unavoidable impurities.
The steel wire rod preferably has the dimensional accuracy of C grade, the maximum width of longitudinal inclusions of the wire rod is below 15 mu m, the proportion of the longitudinal inclusions with the width less than or equal to 10 mu m is above 99.5 percent, and the tensile strength is 870-1000 MPa.
The steel wire rod for reducing the heat treatment of the superfine steel cord comprises the following components in percentage by weight:
c: carbon is an economic and effective strengthening element of steel, the strength and hardness of the steel wire rod after heat treatment are too low when the carbon content is too low, the plasticity and toughness are reduced when the carbon content is too high, the segregation and net carbon control difficulty is increased, wire breakage is easy to occur in the drawing process, the carbon content is properly reduced while the strength of the finished steel wire is ensured, the carbon segregation is favorably improved, the wire rod plasticity is improved, and the deep drawing process is suitable, so that the C content is controlled to be 0.55-0.65%;
mn: manganese is an element for improving the hardenability of steel, and is infinitely solid-dissolved with Fe to improve the strength of the steel wire rod, but the content of manganese is higher to reduce the plasticity of the steel, and alloy segregation of a continuous casting billet is easily caused, so that the content of Mn is controlled to be 0.40-0.60%;
si: silicon is an important reducing agent and deoxidizing agent in the steelmaking process, can be dissolved in ferrite and austenite to improve the hardness and strength of steel, but the silicon content is higher to reduce the plasticity and toughness of the steel, and a certain manganese-silicon ratio needs to be maintained in the cord steel composition design process, so that the Si content is controlled to be 0.15-0.30%;
p, S: phosphorus easily causes the plasticity and the impact toughness to be obviously reduced, sulfur easily reduces the ductility and the toughness of steel, cracks are caused during forging and rolling, and the lower the content of phosphorus and sulfur is, the better the content of phosphorus and sulfur is, so that the content of P is controlled to be less than or equal to 0.015 percent, and the content of S is controlled to be less than or equal to 0.010 percent;
cr: chromium can increase the hardenability of steel and has the function of secondary hardening, the hardness and the wear resistance of carbon steel can be improved without making the steel brittle, but the higher chromium can influence the hot rolling strength and the plasticity of the steel, the work hardening rate is high in the wire rod drawing process, and the wire rod drawing process is not beneficial to drawing, so that the Cr content is controlled to be less than or equal to 0.05 percent;
ni: the nickel can increase the strength, toughness, hardenability and corrosion resistance of the steel, the hardenability is particularly increased by combining with Cr and Mo, and the steel has very high fatigue limit, but the higher nickel can increase the cost and increase the hot brittleness of pearlite, so the Ni content is controlled to be less than or equal to 0.05 percent;
cu: copper can improve the strength and yield ratio of steel, but hot brittleness is easy to generate during hot processing, so the Cu content is controlled to be less than or equal to 0.05 percent;
mo: molybdenum can improve hardenability and heat strength in steel, but the toughness is reduced when the molybdenum is high and ferrite or other brittle phases can appear, so that the content of Mo is controlled to be less than or equal to 0.03 percent;
al: the aluminum refines grains in the steel, fixes nitrogen in the steel, improves the impact toughness of the steel but reduces the cold brittleness tendency and the aging tendency, the castability of molten steel is deteriorated due to the over-high aluminum content, and B (aluminum oxide) inclusions are increased to cause wire breakage in drawing, so the Al content is controlled to be less than or equal to 0.0020 percent.
Ti: titanium, nitrogen, oxygen and carbon have strong affinity, the plasticity and impact toughness of the steel are improved, but formed TiN and Ti (CN) belong to hard and brittle inclusion in the steel, the hardenability is reduced due to high Ti content, and the drawing processing performance is deteriorated, so that the content of Ti is controlled to be less than or equal to 0.0010 percent;
o, N: o is a harmful element in steel, expressed as FeO, MnO, SiO2、Al2O3The inclusion forms of the steel and the like reduce the strength and the plasticity of the steel, the N can obviously improve the strength of the steel, and the plasticity, particularly the toughness, is also obviously reduced, so the invention controls the [ O ]] ≤0.0020％，[N]≤0.0050％。
The above steel wire rod, preferably, the wire rod is used for production
The superfine steel cord is produced by one-time heat treatment, and the filament breakage rate is less than or equal to 1.0 time/ton.
The production process of the steel wire rod for the heat-reducing treatment of the superfine steel cord comprises the following steps:
s1: smelting molten steel: the molten iron special for the cord steel is subjected to pre-desulfurization and converter double-slag treatment to obtain molten steel, and the molten iron special for the cord steel comprises the following components in percentage by mass: c: 4.0-4.5%, Mn is less than or equal to 1.0%, Si: 0.20-0.50%, Cr is less than or equal to 0.04%, Ni is less than or equal to 0.03%, Cu is less than or equal to 0.03%, P is less than or equal to 0.12%, S is less than or equal to 0.05%, Mo is less than or equal to 0.03%, Ti is less than or equal to 0.05%, the balance of Fe and unavoidable impurities, the mass percentage content of S is controlled to be less than or equal to 0.005% in the pre-desulfurization method, the converter double-slag method adopts slagging materials consisting of lime and dolomite, the dosage of the slagging materials is 4-6 tons, the mass percentage content of P is controlled to be less than or equal to 0.012%, the converter tapping adopts a sliding plate to block slag, the converter is prevented from slagging, and the number of impurities is reduced from the source;
s2: LF refining: the molten steel in the step S1 is deoxidized and processed through the whole LF refining process by adopting a slag changing process, the alkalinity before slag changing in the slag changing process is adjusted to 2-2.5, the slag is favorable for deoxidation and desulfurization, meanwhile, the corrosion of a steel ladle is reduced, the degree of reduction after slag changing is adjusted to 0.5-1.0, the plasticity of inclusions can be improved, the plasticity inclusions are favorable for improving the drawing performance of a wire rod, and the composition adjustment is carried out by adopting low-aluminum low-titanium special ferrosilicon in the refining process, so that the aluminum and titanium contents in the steel are effectively reduced, and B-type aluminum oxide inclusions and titanium inclusions are reduced;
the special low-aluminum low-titanium ferrosilicon comprises the following components in percentage by mass: 75 percent of Si, less than or equal to 0.03 percent of Al, less than or equal to 0.02 percent of Ti and the balance of Fe and inevitable impurities, wherein the soft blowing time of argon is more than or equal to 50min and the soft blowing flow is 30-60L/min in the refining process, so that the impurities are fully floated, the impurities in the steel are further reduced to obtain refined molten steel, and the components of the refined molten steel meet the requirements;
s3: continuous casting: adopting the molten steel refined in the step S2 as 150 x 150mm2Continuous casting of a cross section, integral nozzle casting and constant-pulling-speed production, wherein the superheat degree is controlled to be 18-28 ℃, a crystallizer is used, the tail end is electromagnetically stirred and is matched with secondary cooling and strong cooling, the specific water amount of the secondary cooling and the strong cooling is 1.7-1.8L/kg, the component segregation of molten steel in the solidification process is reduced by low-superheat-degree casting and the strong cooling, and the carbon segregation index of a continuous casting billet is within 1.07 to obtain the continuous casting billet;
s4: rolling: sequentially carrying out preheating, high-pressure water dephosphorization, 6-pass rough rolling, 8-pass intermediate rolling, 6-pass pre-finish rolling and 12-pass finish rolling on the continuous casting slab in the step S3, wherein the high-pressure water dephosphorization pressure is more than or equal to 14MPa, removing the surface iron scale of the steel billet, then, rolling the steel billet in a rough rolling mill set, ensuring the surface quality of the product with better descaling effect, the initial rolling temperature of rough rolling is 1000-;
s5: and (3) cooling control: feeding the wire rod of the step S4 into stelmor for slow cooling through spinning, wherein the spinning temperature is 870 ℃ and 900 ℃, the air quantity is reduced under the condition of ensuring the sorbite content, and the air quantity of the air cooling is 200000m as the maximum air quantity375-80% of the volume/hour, after air cooling, covering a heat preservation cover below 500 ℃, wherein the roller speed is 1.05-1.35m/s, realizing a low-strength process route, realizing timely and accurate measurement through an online diameter gauge, and ensuring that the dimensional precision of the wire rod reaches C-level precision: the allowable deviation is +/-0.15 mm, the out-of-roundness is not more than 0.24mm, the mechanical property and the structure of the wire rod suitable for drawing are obtained, and the 0-level proportion of the wire rod grain boundary cementite reaches 100 percent.
Compared with the prior art, the invention has the beneficial effects that:
compared with a YLX70A steel wire rod, the steel wire rod has the advantages that the tensile strength of the wire rod is reduced and the reduction rate of the section of the wire rod is improved by designing a brand-new component system and a proper smelting process, the tensile strength is 870-plus 1000MPa, and the steel wire rod has excellent drawing performance; adopts special molten iron and special low-aluminum and low-titanium special for low-titanium cord steelThe ferrosilicon is used for plasticizing inclusions and reducing the sizes of the inclusions in steel by a slag changing process, the maximum width of longitudinal inclusions of a wire rod is below 15 mu m, the ratio of the longitudinal inclusions with the width of less than or equal to 10 mu m is more than 99.5 percent, segregation is improved by a constant drawing speed, low superheat degree pouring and forced cooling process, the carbon segregation index of a continuous casting billet can be stably controlled within 1.07, the mechanical property and the structure of the wire rod suitable for drawing are obtained by a low-strength controlled cooling process route, the 0-level proportion of grain boundary cementite of the wire rod reaches 100 percent, and the ferrosilicon can be used for producing wire rod
The ultra-fine steel cord realizes the primary drawing of coarse drawing and medium drawing, reduces the primary heat treatment in the drawing process, not only reduces the carbon emission, but also greatly improves the production efficiency, reduces the production cost and meets the processing requirement.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a comparative graph of examples and comparative examples;
in the figure: (a) is the center segregation diagram of example 1; (b) is the center segregation plot of comparative example 1; (c) the net carbon diagram of example 2, and (d) the net carbon diagram of comparative example 2.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
Example 1:
in a preferred embodiment of the YLX70C steel wire rod for heat-reduction treated extra-fine steel cord according to the present invention, the steel wire rod for heat-reduction treated extra-fine steel cord comprises the following components by mass: c: 0.55%, Mn: 0.4%, Si: 0.15%, P: 0.011%, S: 0.005%, Cr: 0.02%, Ni:0.01 percent, 0.01 percent of Cu, 0.02 percent of Mo, 0.0006 percent of Al, 0.0004 percent of Ti, less than or equal to 0.0020 percent of O, and less than or equal to 0.0050 percent of N; the balance being Fe and unavoidable impurities.
The production process of the steel wire rod for the heat-reducing treatment of the superfine steel cord comprises the following steps:
s1: smelting molten steel: the special molten iron for the cord steel is subjected to KR method pre-desulfurization and converter double-slag method treatment, and comprises the following components in percentage by mass: c: 4.2%, Mn: 0.4%, Si: 0.25%, Cr: 0.03%, Ni 0.01%, Cu: 0.01%, P: 0.12%, S: 0.02%, Mo: 0.02%, Ti: 0.03 percent, the balance being Fe and inevitable impurities, controlling the mass percentage of S to be less than or equal to 0.005 percent by pre-desulfurization, adopting a 120-ton converter double-slag method to form slag-making materials consisting of lime and dolomite, controlling the mass percentage of P to be less than or equal to 0.012 percent by using 4-6 tons of slag-making materials, and obtaining molten steel by pushing off slag by adopting a sliding plate during converter tapping;
s2: LF refining: refining the molten steel obtained in the step S1 through a slag changing process by using 120-ton LF, adjusting the alkalinity of the molten steel before slag changing in the slag changing process to 2-2.5, adjusting the reduction degree after slag changing to 0.5-1.0, and adjusting the components of the molten steel by using special low-aluminum and low-titanium ferrosilicon in the refining process; the special low-aluminum low-titanium ferrosilicon comprises the following components in percentage by mass: 75% of Si, less than or equal to 0.03% of Al, less than or equal to 0.02% of Ti and the balance of Fe and inevitable impurities, wherein the soft blowing time of argon is more than or equal to 50min and the soft blowing flow rate is 30-60L/min in the refining process, so that inclusions in steel are further reduced to obtain refined molten steel;
s3: continuous casting: adopting the molten steel refined in the step S2 as 150 x 150mm2Eight-machine eight-stream continuous casting of a section, integral nozzle casting and constant drawing speed production, wherein the superheat degree is controlled to be 18-28 ℃, a crystallizer is used, the tail end is electromagnetically stirred and is matched with secondary cooling and strong cooling, the specific water amount of the secondary cooling and strong cooling is 1.7-1.8L/kg, the carbon segregation index of a continuous casting billet is within 1.07, and the continuous casting billet is obtained;
s4: high-speed wire rolling: sequentially carrying out preheating, high-pressure water dephosphorization, 6-pass rough rolling of a 1-6# rough rolling unit, 8-pass middle rolling of a 7-14# middle rolling unit, 15-20# unit pass pre-finish rolling and 12-pass finish rolling of a 21-32# unit on the continuous casting slab obtained in the step S3, wherein the high-pressure water dephosphorization pressure is not less than 14MPa, the rough rolling start rolling temperature is 1050 ℃, the finish rolling temperature of a 19-28# finish rolling unit is 890-930 ℃, and the temperature of a 29-32# reducing sizing unit is 950-910-plus, so as to obtain a wire rod;
s5: and (3) cooling control: feeding the wire rod of the step S4 into stelmor for slow cooling through spinning, wherein the spinning temperature is 870 ℃ and 900 ℃, and the air volume of the No. 1-4 fan is 200000m of the maximum air volume380%, 75% of/h, covering the heat preservation cover below 500 ℃ after air cooling, wherein the roller speed is 1.05-1.35m/s, and the dimension can be measured accurately in time through an online diameter measuring instrument, so that the dimension precision of the wire rod can reach the C-grade precision of the national standard GB/14918: tolerance deviation
The out-of-roundness is less than or equal to 0.24mm, the mechanical property and the structure of the wire rod suitable for drawing are obtained, and the 0-level proportion of the wire rod grain boundary cementite reaches 100 percent.
Example 2:
in a preferred embodiment of the YLX70C steel wire rod for heat-reduction treated extra-fine steel cord according to the present invention, the steel wire rod for heat-reduction treated extra-fine steel cord comprises the following components by mass: c: 0.6%, Mn: 0.5%, Si: 0.2%, P: 0.01%, S: 0.004%, Cr: 0.03%, Ni: 0.01%, Cu: 0.01%, Mo: 0.03%, Al: 0.0005%, Ti: 0.0005%, less than or equal to 0.0020% of [ O ], less than or equal to 0.0050% of [ N ]; the balance being Fe and unavoidable impurities.
The production process of the steel wire rod for the heat-reducing treatment of the superfine steel cord comprises the following steps:
s1: smelting molten steel: the special molten iron for the cord steel is subjected to KR method pre-desulfurization and converter double-slag method treatment, and the special molten iron for the cord steel comprises the following components in percentage by mass: c: 4.3%, Mn: 0.25%, Si: 0.25%, Cr: 0.03%, Ni: 0.01%, Cu: 0.001%, P: 0.11%, S: 0.03%, Mo: 0.03%, Ti: 0.04 percent, the balance being Fe and inevitable impurities, controlling the mass percentage of S to be less than or equal to 0.005 percent in the pre-desulfurization process, adopting a 120-ton converter double-slag method to form slag-making materials consisting of lime and dolomite, controlling the mass percentage of P to be less than or equal to 0.012 percent in the slag-making materials, and obtaining molten steel by adopting a sliding plate to block slag in the converter tapping;
s2: LF refining: refining the molten steel obtained in the step S1 through a slag changing process by using 120-ton LF, adjusting the alkalinity of the molten steel before slag changing in the slag changing process to 2-2.5, adjusting the reduction degree after slag changing to 0.5-1.0, and adjusting the components of the molten steel by using special low-aluminum and low-titanium ferrosilicon in the refining process; the special ferrosilicon for low aluminum and low titanium comprises the following components in percentage by mass: 75% of Si, less than or equal to 0.03% of Al, less than or equal to 0.02% of Ti and the balance of Fe and inevitable impurities, wherein the soft blowing time of argon is more than or equal to 50min and the soft blowing flow rate is 30-60L/min in the refining process, so that inclusions in steel are further reduced to obtain refined molten steel;
s3: continuous casting: adopting the molten steel refined in the step S2 as 150 x 150mm2Eight-machine eight-stream continuous casting of a section, integral nozzle casting and constant drawing speed production, wherein the superheat degree is controlled to be 18-28 ℃, a crystallizer is used, the tail end is electromagnetically stirred and is matched with secondary cooling and strong cooling, the specific water amount of the secondary cooling and strong cooling is 1.7-1.8L/kg, the carbon segregation index of a continuous casting billet is within 1.07, and the continuous casting billet is obtained;
s4: high-speed wire rolling: sequentially carrying out preheating, high-pressure water dephosphorization, 6-pass rough rolling of a 1-6# rough rolling unit, 8-pass middle rolling of a 7-14# middle rolling unit, 15-20# unit pass pre-finish rolling and 12-pass finish rolling of a 21-32# unit on the continuous casting slab obtained in the step S3, wherein the high-pressure water dephosphorization pressure is not less than 14MPa, the rough rolling start rolling temperature is 1050 ℃, the finish rolling temperature of a 19-28# finish rolling unit is 890-930 ℃, and the temperature of a 29-32# reducing sizing unit is 950-910-plus, so as to obtain a wire rod;
s5: and (3) cooling control: feeding the wire rod of the step S4 into stelmor for slow cooling through spinning, wherein the spinning temperature is 870 ℃ and 900 ℃, and the air volume of the No. 1-4 fan is 200000m of the maximum air volume380%, 75% of/h, covering the heat preservation cover below 500 ℃ after air cooling, wherein the roller speed is 1.05-1.35m/s, and the dimension can be measured accurately in time through an online diameter measuring instrument, so that the dimension precision of the coil rod can reach the C-grade precision of the national standard GB/14918: tolerance deviation
Out-of-roundness is less than or equal to 0.24mm, mechanical properties and structure of the wire rod suitable for drawing are obtained, and 0-level proportion of wire rod grain boundary cementiteReaching 100 percent.
Example 3:
in a preferred embodiment of the YLX70C steel wire rod for heat-reduction treated ultrafine steel cord according to the present invention, the steel wire rod for heat-reduction treated ultrafine steel cord comprises the following components by mass: c: 0.65%, Mn: 0.6%, Si: 0.18%, P: 0.003%, S: 0.004%, Cr: 0.02%, Ni: 0.01%, Cu: 0.01%, Mo: 0.01%, Al: 0.0007%, Ti: 0.0003 percent, less than or equal to 0.0020 percent of [ O ], less than or equal to 0.0050 percent of [ N ]; the balance being Fe and unavoidable impurities.
The production process of the steel wire rod for the heat-reducing treatment of the superfine steel cord comprises the following steps:
s1: smelting molten steel: the special molten iron for the cord steel is subjected to KR method pre-desulfurization and converter double-slag method treatment, and the special molten iron for the cord steel comprises the following components in percentage by mass: c: 4.4%, Mn: 0.6%, Si: 0.4%, Cr: 0.04%, Ni: 0.01%, Cu: 0.01%, P: 0.115%, S: 0.035%, Mo: 0.02%, Ti: 0.035%, the balance of Fe and inevitable impurities, the mass percentage content of S in the pre-desulfurization control is less than or equal to 0.005%, the slag forming material consisting of lime and dolomite is adopted in a 120-ton converter double-slag method, the using amount of the slag forming material is 4-6 tons, the mass percentage content of P is controlled to be less than or equal to 0.012%, and the sliding plate is adopted for slag stopping during the converter tapping to obtain molten steel;
s2: LF refining: refining the molten steel obtained in the step S1 through a slag changing process by using 120-ton LF, adjusting the alkalinity of the molten steel before slag changing in the slag changing process to 2-2.5, adjusting the reduction degree after slag changing to 0.5-1.0, and adjusting the components of the molten steel by using special low-aluminum and low-titanium ferrosilicon in the refining process; the special low-aluminum low-titanium ferrosilicon comprises the following components in percentage by mass: 75% of Si, less than or equal to 0.03% of Al, less than or equal to 0.02% of Ti and the balance of Fe and inevitable impurities, wherein the soft blowing time of argon is more than or equal to 50min and the soft blowing flow rate is 30-60L/min in the refining process, so that inclusions in steel are further reduced to obtain refined molten steel;
s3: continuous casting: adopting the molten steel refined in the step S2 as 150 x 150mm2Eight-machine eight-stream continuous casting of a section, integral nozzle casting and constant drawing speed production, the superheat degree is controlled to be 18-28 ℃, a crystallizer and a tail end are used for electromagnetic stirring and matched with a second crystallizerCold forced cooling, wherein the specific water amount of the secondary cold forced cooling is 1.7-1.8L/kg, and the carbon segregation index of the continuous casting is within 1.07 to obtain a continuous casting;
s4: high-speed wire rolling: sequentially carrying out preheating, high-pressure water dephosphorization, 6-pass rough rolling of a 1-6# rough rolling unit, 8-pass middle rolling of a 7-14# middle rolling unit, 15-20# unit pass pre-finish rolling and 21-32# unit 12-pass finish rolling on the continuously cast bloom in the step S3, wherein the high-pressure water dephosphorization pressure is not less than 14MPa, the rough rolling start rolling temperature is 1000-1050 ℃, the finish rolling temperature of a 19-28# finish rolling unit is 890-930 ℃, and the temperature of a 29-32# reducing sizing unit is 910-950 ℃, so as to obtain a wire rod;
s5: and (3) cooling control: feeding the wire rod of the step S4 into stelmor for slow cooling through spinning, wherein the spinning temperature is 870 ℃ and 900 ℃, and the air volume of the No. 1-4 fan is 200000m of the maximum air volume380%, 75% of/h, covering the heat preservation cover below 500 ℃ after air cooling, wherein the roller speed is 1.05-1.35m/s, and the dimension can be measured accurately in time through an online diameter measuring instrument, so that the dimension precision of the wire rod can reach the C-grade precision of the national standard GB/14918: tolerance deviation
The out-of-roundness is less than or equal to 0.24mm, the mechanical property and the structure of the wire rod suitable for drawing are obtained, and the 0-level proportion of the wire rod grain boundary cementite reaches 100 percent.
Comparative example 1: the composition components of the YLX70A steel wire rod are as follows by mass fraction: c: 0.68%, Mn: 0.48%, Si: 0.18%, P: 0.01%, S: 0.006%, Cr: 0.04%, Ni: 0.01%, Cu: 0.01%, Mo: 0.02%, Al: 0.0008%, Ti: 0.0006 percent; the balance being Fe and unavoidable impurities.
Comparative example 2: the composition components of the YLX70A steel wire rod are as follows by mass fraction: c: 0.7%, Mn: 0.2%, Si: 0.2%, P: 0.012%, S: 0.005%, Cr: 0.03%, Ni: 0.01%, Cu: 0.01%, Mo: 0.03%, Al: 0.0009%, Ti: 0.0007 percent; the balance being Fe and unavoidable impurities.
Comparative example 3: the composition components of the YLX70A steel wire rod are as follows by mass fraction: c: 0.75%, Mn: 0.55%, Si: 0.25%, P: 0.009%, S: 0.004%, Cr: 0.03%, Ni: 0.01%, Cu: 0.01%, Mo: 0.02%, Al: 0.0008%, Ti: 0.0005%; the balance being Fe and unavoidable impurities.
The steel is produced by molten steel smelting, LF refining, continuous casting, rolling and controlled cooling processes in a comparative example 1, a comparative example 2 and a comparative example 3, wherein the LF refining process adopts a slag changing process, the alkalinity before slag changing in the slag changing process is adjusted to be 1.7-2.0, the reduction degree after slag changing is adjusted to be 0.8-1.2, the soft blowing time in the refining process is more than or equal to 40min, the continuous casting billet is sequentially subjected to preheating, high-pressure water dephosphorization, 6-pass rough rolling, 8-pass medium rolling, 4-pass pre-finish rolling and 12-pass finish rolling processes, the high-pressure water dephosphorization pressure is more than or equal to 12MPa, the start rolling temperature in the 30-pass rolling process is 980-plus 1030 ℃, the finish rolling temperature is 900-plus 940 ℃, the intake reducing sizing machine temperature is 920-plus, the wire temperature in the controlled cooling process is 900-plus air, and the air volume of the No. 1-4# air-cooled fan is respectively at the maximum 200000m385%, 85% of/h.
The tests of examples 1-3 and comparative examples 1-3 were compared, and the components were tested according to GB/T223 standard, the tensile strength and the surface shrinkage were tested according to GB/T228 standard, and the grain boundary cementite rating was tested according to GB/T24242.1, and the results were as follows:
the substantial absence of black dots is seen from the center segregation diagram of FIG. 1(a), while the presence of distinct black dots is seen from the center segregation diagram of FIG. 1 (b); comparing the cementite network structures in fig. 1(a) and fig. 1(b), it can be known from the drawings and the above table that the carbon segregation index of the continuous casting slab of the invention can be stably controlled within 1.07, and the 0-level proportion of the wire rod grain boundary cementite reaches 100%; the wire rod has the dimensional accuracy reaching C-level accuracy, the maximum width of longitudinal inclusions is below 15 mu m, the size of the inclusions is lower than that of a YLX70A steel wire rod, the ratio of the longitudinal inclusions with the width less than or equal to 10 mu m is more than 99.5 percent, the tensile strength is 870-plus-1000 MPa, the average tensile strength is reduced by about 110MPa compared with the comparative example, the surface shrinkage is improved by more than 6 percent, the wire rod drawing performance is greatly improved, and the wire breakage rate is less than or equal to 1.0 times per ton.
The tensile strength of the wire rod is reduced and the reduction of the section of the wire rod is improved by designing a brand new component system, which is beneficial to drawing the steel wire; the method adopts a proper smelting process method, adopts special molten iron for low-titanium cord steel and special ferrosilicon for low-aluminum and low-titanium, and adopts the process routes of slag changing, constant drawing speed, low superheat degree pouring, strong cooling and low-strength controlled cooling, wherein the slag changing plasticizes inclusions and reduces the sizes of the inclusions in the steel, the plastic inclusions are beneficial to drawing deformation, electromagnetic stirring of a crystallizer and the tail end electromagnetic stirring are matched with the strong cooling to improve segregation, so that the drawing broken wire risk caused by the inclusions is reduced, and the low-strength controlled cooling obtains the mechanical property and the structure of the wire rod suitable for drawing.
Due to the improvement of the comprehensive performance of the wire rod, the drawing process of a user can realize one-time drawing of coarse drawing and medium drawing, the heat treatment of the drawing process is reduced, and the wire rod can be used for production
The ultra-fine steel cord not only reduces carbon emission, but also greatly improves production efficiency and reduces production cost, and in addition, the specification of the wet drawing wire is properly finely adjusted, so that the breaking force can reach the quality level of the steel wire processed by the conventional wire rod, and the processing requirement is met.
The above-listed detailed description is only a specific description of a possible embodiment of the present invention, and they are not intended to limit the scope of the present invention, and equivalent embodiments or modifications made without departing from the technical spirit of the present invention should be included in the scope of the present invention.
Claims (10)
1. A steel wire rod for reducing heat treatment of an ultra-fine steel cord is characterized by comprising the following components in percentage by mass: c: 0.55-0.65%, Mn: 0.40-0.60%, Si: 0.15 to 0.30 percent of Ni, less than or equal to 0.015 percent of P, less than or equal to 0.010 percent of S, less than or equal to 0.05 percent of Cr, less than or equal to 0.05 percent of Ni, less than or equal to 0.05 percent of Cu, less than or equal to 0.03 percent of Mo, less than or equal to 0.0020 percent of Al, less than or equal to 0.0010 percent of Ti, less than or equal to 0.0020 percent of O, and less than or equal to 0.0050 percent of N; the balance being Fe and unavoidable impurities.
2. The steel wire rod for heat-reducing treatment of ultrafine steel cord as claimed in claim 1, wherein the dimensional accuracy of the wire rod is C-class accuracy, the maximum width of longitudinal inclusions in the wire rod is 15 μm or less, the proportion of longitudinal inclusions with a width of 10 μm or less is 99.5% or more, and the tensile strength is 870-.
3. A steel wire rod for heat-reduction treatment of extra fine steel cord according to claim 1 or 2, wherein the wire rod is used for producing extra fine steel cord with a diameter of 0.15mm by one heat treatment.
4. The process for producing a steel wire rod for heat-reducing treatment of an ultrafine steel cord as claimed in claim 1 or 2, comprising the steps of molten steel smelting, LF refining, continuous casting, rolling and controlled cooling in sequence, wherein the spinning temperature in the controlled cooling step is 870-900 ℃, and the air flow rate of air cooling is 200000m375-80% of the hour, and covering a heat preservation cover below 500 ℃ after air cooling.
5. The production process of the steel wire rod for reducing heat of the ultrafine steel cord according to claim 4, wherein the molten steel smelting process selects the molten iron special for the cord steel, and the molten iron special for the cord steel comprises the following components in percentage by mass: c: 4.0-4.5%, Mn is less than or equal to 1.0%, Si: 0.20 to 0.50 percent of Fe, less than or equal to 0.04 percent of Cr, less than or equal to 0.03 percent of Ni, less than or equal to 0.03 percent of Cu, less than or equal to 0.12 percent of P, less than or equal to 0.05 percent of S, less than or equal to 0.03 percent of Mo, less than or equal to 0.05 percent of Ti, and the balance of Fe and inevitable impurities.
6. The process for producing the steel wire rod for the heat-reducing treatment of the ultra-fine steel cord as claimed in claim 5, wherein the molten iron special for the cord steel is subjected to pre-desulfurization and converter double slag treatment to obtain molten steel, and the converter tapping adopts a sliding plate to block slag.
7. The production process of the steel wire rod for the heat-reducing treatment of the ultrafine steel cord as claimed in claim 4, wherein the LF refining process adopts a slag changing process, the refining process adopts low-aluminum low-titanium special ferrosilicon for component adjustment, and the low-aluminum low-titanium special ferrosilicon comprises the following components in percentage by mass: 75 percent of Si, less than or equal to 0.03 percent of Al, less than or equal to 0.02 percent of Ti, and the balance of Fe and inevitable impurities.
8. The process for producing the steel wire rod for heat-reducing treatment of the ultra-fine steel cord as claimed in claim 7, wherein the alkalinity before changing slag in the slag changing process is adjusted to 2-2.5, the degree of reduction after changing slag is adjusted to 0.5-1.0, and the soft blowing time in the refining process is not less than 50 min.
9. The production process of the steel wire rod for the heat-reducing treatment of the ultrafine steel cord as claimed in claim 4, wherein the continuous casting process adopts constant drawing speed production, the superheat degree is controlled to be 18-28 ℃, a crystallizer is used, the tail end is electromagnetically stirred and is matched with secondary cooling and strong cooling, the specific water amount of the secondary cooling and strong cooling is 1.7-1.8L/kg, and the carbon segregation index of the continuous casting billet is within 1.07.
10. The process for producing a steel wire rod for heat-reducing treatment of ultrafine steel cord as claimed in claim 4, wherein the rolling process comprises preheating, high-pressure water dephosphorization, 6-pass rough rolling, 8-pass intermediate rolling, 6-pass pre-finish rolling and 12-pass finish rolling, wherein the high-pressure water dephosphorization pressure is not less than 14MPa, the rough rolling start rolling temperature is 1000-.
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| CN116334498A (en) * | 2023-05-29 | 2023-06-27 | 张家港荣盛特钢有限公司 | Wire rod for steel strand and preparation method thereof |
| CN116334498B (en) * | 2023-05-29 | 2024-01-19 | 张家港荣盛特钢有限公司 | Wire rod for steel strand and preparation method thereof |
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