CN114182164A - Steel for steel cord with tensile strength of more than or equal to 4000MPa and production method - Google Patents
Steel for steel cord with tensile strength of more than or equal to 4000MPa and production method Download PDFInfo
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- CN114182164A CN114182164A CN202111245682.9A CN202111245682A CN114182164A CN 114182164 A CN114182164 A CN 114182164A CN 202111245682 A CN202111245682 A CN 202111245682A CN 114182164 A CN114182164 A CN 114182164A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 79
- 239000010959 steel Substances 0.000 title claims abstract description 79
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 20
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 11
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 11
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 11
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 7
- 229910052802 copper Inorganic materials 0.000 claims abstract description 7
- 239000012535 impurity Substances 0.000 claims abstract description 7
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 7
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 7
- FBPFZTCFMRRESA-JGWLITMVSA-N D-glucitol Chemical group OC[C@H](O)[C@@H](O)[C@H](O)[C@H](O)CO FBPFZTCFMRRESA-JGWLITMVSA-N 0.000 claims abstract description 6
- 229910001567 cementite Inorganic materials 0.000 claims abstract description 6
- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical compound C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 claims abstract description 6
- 239000000126 substance Substances 0.000 claims abstract description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 32
- 238000009749 continuous casting Methods 0.000 claims description 23
- 238000005096 rolling process Methods 0.000 claims description 23
- 230000001276 controlling effect Effects 0.000 claims description 22
- 239000002893 slag Substances 0.000 claims description 21
- 238000000034 method Methods 0.000 claims description 16
- 229910052742 iron Inorganic materials 0.000 claims description 14
- 238000007670 refining Methods 0.000 claims description 13
- 238000003723 Smelting Methods 0.000 claims description 12
- 229910052782 aluminium Inorganic materials 0.000 claims description 12
- 238000001816 cooling Methods 0.000 claims description 12
- 238000009847 ladle furnace Methods 0.000 claims description 12
- 239000011572 manganese Substances 0.000 claims description 10
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 8
- 238000005204 segregation Methods 0.000 claims description 8
- 238000003756 stirring Methods 0.000 claims description 8
- 230000009467 reduction Effects 0.000 claims description 7
- 238000000227 grinding Methods 0.000 claims description 6
- 230000002159 abnormal effect Effects 0.000 claims description 5
- 229910001563 bainite Inorganic materials 0.000 claims description 5
- 229910000734 martensite Inorganic materials 0.000 claims description 5
- 230000008569 process Effects 0.000 claims description 5
- 230000009466 transformation Effects 0.000 claims description 5
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims description 4
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 4
- 238000005422 blasting Methods 0.000 claims description 4
- 230000008859 change Effects 0.000 claims description 4
- 238000006477 desulfuration reaction Methods 0.000 claims description 4
- 230000023556 desulfurization Effects 0.000 claims description 4
- 238000001514 detection method Methods 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 4
- 229910052757 nitrogen Inorganic materials 0.000 claims description 4
- 229910052760 oxygen Inorganic materials 0.000 claims description 4
- 239000001301 oxygen Substances 0.000 claims description 4
- 229910001562 pearlite Inorganic materials 0.000 claims description 4
- 239000010703 silicon Substances 0.000 claims description 4
- 238000004513 sizing Methods 0.000 claims description 4
- 238000002791 soaking Methods 0.000 claims description 4
- 238000007711 solidification Methods 0.000 claims description 4
- 230000008023 solidification Effects 0.000 claims description 4
- 238000009987 spinning Methods 0.000 claims description 4
- 239000011593 sulfur Substances 0.000 claims description 4
- 230000007704 transition Effects 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 3
- 239000006004 Quartz sand Substances 0.000 claims description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 3
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 3
- 238000007664 blowing Methods 0.000 claims description 3
- 239000004571 lime Substances 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 239000006260 foam Substances 0.000 claims description 2
- 238000005498 polishing Methods 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims 1
- 238000004134 energy conservation Methods 0.000 abstract description 4
- 230000007613 environmental effect Effects 0.000 abstract description 4
- 230000015572 biosynthetic process Effects 0.000 abstract description 3
- 230000006872 improvement Effects 0.000 abstract description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 238000010079 rubber tapping Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000011265 semifinished product Substances 0.000 description 1
- 230000000638 stimulation Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000000844 transformation Methods 0.000 description 1
Classifications
-
- 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
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
-
- 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
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/52—Manufacture of steel in electric furnaces
-
- 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
- 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
- C21C7/072—Treatment with gases
-
- 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
- C21C7/10—Handling in a vacuum
-
- 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
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
-
- 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
- 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
-
- 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
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The invention discloses steel for a steel cord with tensile strength of more than or equal to 4000MPa and a production method, and relates to the technical field of steel production, wherein the steel comprises the following chemical components in percentage by weight: c: 0.89 to 1.10wt%, Si: 0.10 to 0.30wt%, Mn: 0.20-0.60 wt%, P is less than or equal to 0.015wt%, S is less than or equal to 0.010wt%, Cr: 0.01 to 0.40wt%, Ni: 0.01 to 0.20wt%, Cu: 0.005-0.30 wt%, less than or equal to 0.0020wt% of Al, less than or equal to 0.0016wt% of Ti, less than or equal to 0.0070wt% of N, and the balance of Fe and inevitable impurities. The wire rod is mainly made of sorbite structure, the formation of reticular cementite used for drawing is avoided from being influenced, the tensile strength of the final finished steel cord is more than 4000MPa, and the requirements of energy conservation, environmental protection and continuous improvement of the strength of the steel cord of the light-weight automobile tire are met.
Description
Technical Field
The invention relates to the technical field of steel production, in particular to steel for a steel cord with the tensile strength of more than or equal to 4000MPa and a production method thereof.
Background
The steel cord is mainly used as the framework material of various tires and other rubber products, the demand of the steel cord is closely related to the output of tire structural varieties, the tire industry in China is rapidly developed under the promotion of favorable factors such as economic stimulation policy, engineering machinery, automobile industry, expressway and the like in recent years, the consumption of the steel cord in China is continuously increased, and the rapid development of the wire rod industry for the steel cord is promoted. China becomes the first automobile market in the world, and the cord line industry is also rapidly developed, and the yield of the cord line industry basically accounts for more than half of the global market. The 70-grade cord is imported for over ten years, the 80-grade high-strength cord is also made into a country (except for cutting steel wires), and advanced enterprises develop towards high-end and ultrahigh-strength (little competition and high gross profit). At present, although the quantity of new automobile pins of an automobile seriously slides down, the tire is in the updating and upgrading period due to the large and increasing automobile keeping quantity, particularly the consumption of engineering tires is large, and the market of steel cords is still increasing.
With the development strategy of energy conservation and environmental protection and national automobile light weight, tires are required to be replaced by lighter products, so that the strength of the cord is required to be higher and higher, the strength of the cord is developed from initial NT grade 2800MPa to the directions of high strength (HT), ultrahigh Strength (ST) and ultrahigh strength (UT), and reaches more than 4000MPa at present. In recent two years, the demand of ultra-high strength cord has rapidly increased to 15000-20000 tons/month, and at present, the usage amount of ST steel cord in developed countries has also exceeded 20%, which is also the direction of strong development in a few domestic powerful steel mills.
The invention patent with publication number CN107794332A provides a smelting method of 90-grade ultrahigh-strength cord steel, which comprises the working procedure operation key points of converter smelting, LF refining, continuous casting protection pouring and the like. The patent proposes a smelting method aiming at component control, slag control, protective pouring continuous casting and the like of each process of 90-grade cord steel, but does not relate to the key control point requirement of central carbon segregation, and does not relate to rolling and structure control.
The invention patent with publication number CN111485052A provides a smelting method of 97-grade ultrahigh-strength cord steel, which adopts the process flow of 'converter blowing-LF refining-continuous casting pouring' to produce the 97-grade ultrahigh-strength cord steel, and realizes a one-fire material low-cost production process of the 97-grade cord steel. The patent mainly provides stable control of carbon-blending components, control of slag systems and inclusions, tests on the sizes of finished inclusions and segregation of semi-finished products, but does not relate to central carbon segregation of continuous casting slabs and the structure control, mechanical properties and the like of key rolled materials.
Disclosure of Invention
Aiming at the technical problems, the invention overcomes the defects of the prior art and provides steel for a steel cord with the tensile strength of more than or equal to 4000MPa, which comprises the following chemical components in percentage by weight: c: 0.89 to 1.10wt%, Si: 0.10 to 0.30wt%, Mn: 0.20-0.60 wt%, P is less than or equal to 0.015wt%, S is less than or equal to 0.010wt%, Cr: 0.01 to 0.40wt%, Ni: 0.01 to 0.20wt%, Cu: 0.005-0.30 wt%, less than or equal to 0.0020wt% of Al, less than or equal to 0.0016wt% of Ti, less than or equal to 0.0070wt% of N, and the balance of Fe and inevitable impurities.
The technical scheme of the invention is further defined as follows:
the steel for the steel cord with the tensile strength of more than or equal to 4000MPa is characterized in that: 0.90-1.00 wt%, Si: 0.15 to 0.30wt%, Mn: 0.20-0.60 wt%, P is less than or equal to 0.015wt%, S is less than or equal to 0.010wt%, Cr: 0.01 to 0.40wt%, Ni: 0.01 to 0.10wt%, Cu: 0.005-0.30 wt%, Al less than or equal to 0.0010wt%, Ti less than or equal to 0.0008wt%, N less than or equal to 0.0050wt%, and the balance of Fe and inevitable impurities.
The invention also aims to provide a method for producing steel for the steel cord with the tensile strength of more than or equal to 4000MPa,
continuous casting: adopting a 250mm multiplied by 300 mm-320 mm multiplied by 480mm rectangular blank, controlling the drawing speed to be 0.50-0.90 m/min during the production of a continuous casting machine, controlling the superheat degree of molten steel to be 15-35 ℃, controlling the specific water amount to be 0.10-0.60L/kg, and controlling the reduction under light pressure to be 10-30 mm, and adopting a crystallizer for electromagnetic stirring and solidification tail end electromagnetic stirring;
rolling the high-speed wire rods: the soaking temperature of a heating furnace of a wire rod factory is controlled to be 1120-1250 ℃, and the total in-furnace time is more than or equal to 2 hours; descaling, rough rolling, medium rolling, fine rolling and sizing reduction, cooling by adopting Steyr, controlling the wire rod spinning temperature to be 890-920 ℃, and controlling the pearlite phase transformation starting temperature to be 550-630 ℃; the cooling speed before phase change reaches 10-50 ℃/s; the cooling speed during the phase transition is-5 to 10 ℃/s.
The production method of the steel for the steel cord with the tensile strength of more than or equal to 4000MPa has the advantages that the sorbite content of a metallographic structure is more than 90 percent, abnormal structures such as martensite and bainite are avoided, the center segregation is not more than 1 grade, and the grain boundary cementite is controlled within 1 grade.
The steel production method for the steel cord with the tensile strength of more than or equal to 4000MPa is characterized in that the specification of the wire rod is phi 5.0-phi 6.5 mm.
The production method of the steel for the steel cord with the tensile strength of more than or equal to 4000MPa specifically comprises the following steps:
(1) pretreating molten iron: molten iron for primary smelting of an electric furnace or a converter is subjected to desulfurization pretreatment, the sulfur content is reduced to be below 0.005 percent by weight, and the molten iron is subjected to slagging-off treatment;
(2) smelting in a converter/electric furnace: controlling the content of P element in molten steel by adopting one-time slagging in the converter blowing process, and performing foam slag and flow slag changing operation by using an electric furnace, wherein the content of P element at the end point is less than or equal to 0.010 percent, and the content of S element is less than or equal to 0.010 percent;
(3) refining: refining the steel after the steel is tapped by a converter through an LF (ladle furnace) -RH (relative humidity) furnace, wherein the refining of the LF furnace adopts silicon and manganese deoxidization, and aluminum or aluminum-containing deoxidant deoxidization is strictly forbidden to reduce the equilibrium oxygen content in molten steel; slagging and regulating slag through pre-melted slag or lime and quartz sand, and controlling the alkalinity R of slag bodies to be 0.6-1.2;
(4) continuous casting;
(5) blank grinding: performing shot blasting and flaw detection on the continuous casting blank or the cogging stock, and polishing according to the surface condition of the continuous casting blank;
(6) and (4) rolling the wire rod at a high speed.
A tensile strength as described aboveThe steel for the steel cord with the temperature more than or equal to 4000MPa is produced, and a continuous casting billet can be directly rolled at a high speed and can also be cogging into 140 multiplied by 140mm2～180×180mm2And (5) rolling the square billet by using a high speed wire.
The invention has the beneficial effects that:
(1) the invention relates to a continuous casting billet center carbon segregation coefficient (C)Center of a ship/CAverage) Less than or equal to 1.06, and the average value is less than or equal to 1.03;
(2) the sorbite content of the invention is more than 90 percent, no martensite, bainite and other abnormal structures exist, the center segregation is not more than 1 grade, and the grain boundary cementite is controlled within 1 grade;
(3) the average tensile strength of the wire rod is more than or equal to 1230MPa, the surface shrinkage is more than or equal to 30 percent, and the wire rod has excellent straight-pulling and stranding performances;
(4) according to the invention, through the components and process control, the wire rod is mainly in a sorbite structure, the formation of a reticular cementite used for drawing is avoided being influenced, the tensile strength of the final finished steel cord is more than 4000MPa, and the requirements of energy conservation, environmental protection and continuous improvement of the strength of the steel cord of the light-weight automobile tire are met.
Detailed Description
Example 1
The steel for the steel cord with the tensile strength of more than or equal to 4000MPa provided by the embodiment comprises the following chemical components in percentage by weight: c: 0.95%, Si: 0.19%, Mn: 0.30%, P: 0.010wt%, S: 0.008wt%, Cr: 0.19%, Ni: 0.03wt%, Cu: 0.05wt%, Al: 0.0009wt%, Ti: 0.0006wt%, N: 0.0032wt%, residual iron and a small amount of residual impurity elements.
The method specifically comprises the following steps:
(1) pretreating molten iron KR: molten iron for primary smelting of the converter is subjected to KR desulfurization pretreatment, the sulfur content is reduced to 0.002% by weight, and slag skimming treatment is carried out on the molten iron;
(2) smelting in a converter: controlling the content of P element in molten steel by adopting one-time slagging in the converter blowing process, wherein the content of P element at the end point is 0.005 percent, and the content of S element is 0.0078 percent;
(3) refining: refining in an LF furnace after converter tapping, wherein the LF furnace refining adopts silicon and manganese for deoxidation, and aluminum or aluminum-containing deoxidizer for deoxidation is strictly forbidden to reduce the equilibrium oxygen content in molten steel; slagging and regulating slag through pre-melted slag, and controlling the alkalinity R of slag bodies to be 0.9;
(4) continuous casting: the drawing speed is 0.88m/min when the 250mm x 300mm rectangular billet continuous casting machine is adopted for production, the superheat degree of molten steel is controlled at 25 ℃, the specific water content is 0.20L/kg, the soft reduction is 10mm, the crystallizer is adopted for electromagnetic stirring, the solidification tail end is adopted for electromagnetic stirring, and the continuous casting billet is cogging into 150 x 150mm2Square billets are rolled by high speed wire;
(5) blank grinding: performing shot blasting and flaw detection on the cogging stock, and performing grinding treatment;
(6) rolling the high-speed wire rods: controlling the soaking temperature of a bloom heating furnace of a wire rod factory to 1180 ℃, and keeping the total in-furnace time for 150 min; descaling, rough rolling, medium rolling, finish rolling, reducing and sizing, cooling by Steyr, controlling the wire rod spinning temperature at 910 ℃ and the pearlite phase transformation starting temperature at 600 ℃; the cooling speed before phase change reaches 30 ℃/s; the cooling rate during the phase transition was 5 ℃/s.
Example 2
The steel for the steel cord with the tensile strength of more than or equal to 4000MPa provided by the embodiment comprises the following chemical components in percentage by weight: c: 0.99%, Si: 0.20%, Mn: 0.25%, P: 0.008wt%, S: 0.006wt%, Cr: 0.20%, Ni: 0.03wt%, Cu: 0.20wt%, Al: 0.0012wt%, Ti: 0.0005wt%, N: 0.0040wt%, and the balance of iron and a small amount of residual impurity elements.
The method specifically comprises the following steps:
(1) pretreating molten iron: carrying out desulfurization pretreatment on molten iron for primary smelting of an electric furnace, reducing the sulfur content to 0.003 percent by weight, and carrying out slag skimming treatment on the molten iron;
(2) electric furnace smelting: the operation of preparing the foamed slag and changing the slag by the electric furnace is finished, and the content of P element is 0.006 percent and the content of S element is 0.006 percent at the end point;
(3) refining: refining the steel after tapping by a converter through an LF (ladle furnace), wherein the refining of the LF adopts silicon and manganese for deoxidation, and aluminum or aluminum-containing deoxidizer for deoxidation is strictly forbidden to reduce the equilibrium oxygen content in molten steel; slagging and slag regulation are carried out through lime and quartz sand, and the alkalinity R of slag bodies is controlled to be 1.0;
(4) continuous casting: when a 320mm multiplied by 480mm rectangular billet continuous casting machine is adopted for production, the drawing speed is 0.50m/min, the superheat degree of molten steel is controlled at 30 ℃, the specific water content is 0.30L/kg, and the pressure is lightThe downward rolling reduction is 12mm, a crystallizer is adopted for electromagnetic stirring, the solidification tail end is adopted for electromagnetic stirring, and the continuous casting billet can be cogging into 150 x 150mm2Square billets are rolled by high speed wire;
(5) blank grinding: performing shot blasting and flaw detection on the primary rolling blank, and performing grinding treatment;
(6) rolling the high-speed wire rods: controlling the soaking temperature of a bloom heating furnace of a wire rod factory to 1190 ℃, and keeping the total in-furnace time to 160 min; descaling, rough rolling, medium rolling, finish rolling, reducing and sizing, cooling by Steyr, controlling the wire rod spinning temperature to 900 ℃ and the pearlite phase transformation starting temperature to 610 ℃; the cooling speed before phase change reaches 35 ℃/s; the cooling rate during the phase transition was 3 ℃/s.
TABLE 1 wire rod Specifications, textures and mechanical Properties
| Examples | Specification of | Average tensile strength | Reduction of area | Metallographic structure | Sorbitizing rate | Center segregation grade |
| 1 | Φ5.5mm | 1250MPa | 35％ | No martensite, bainite and other abnormal structures | 92% | 0.5 |
| 2 | Φ5.5mm | 1240MPa | 36％ | No martensite, bainite and other abnormal structures | 95% | 0.5 |
TABLE 2 finished wire specifications and mechanical properties
| Examples | Specification of | Tensile strength |
| 1 | Φ0.22mm | 4020MPa |
| 2 | Φ0.22mm | 4010MPa |
The wire rod is mainly made of sorbite structure, the formation of reticular cementite used for drawing is avoided from being influenced, the tensile strength of the final finished steel cord is more than 4000MPa, and the requirements of energy conservation, environmental protection and continuous improvement of the strength of the steel cord of the light-weight automobile tire are met. The ton steel gross profit is more than 500 yuan/ton, and the economic benefit is remarkable.
In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention.
Claims (7)
1. A steel for a steel cord with tensile strength of more than or equal to 4000MPa is characterized in that: the chemical components and weight percentage are as follows: c: 0.89 to 1.10wt%, Si: 0.10 to 0.30wt%, Mn: 0.20-0.60 wt%, P is less than or equal to 0.015wt%, S is less than or equal to 0.010wt%, Cr: 0.01 to 0.40wt%, Ni: 0.01 to 0.20wt%, Cu: 0.005-0.30 wt%, less than or equal to 0.0020wt% of Al, less than or equal to 0.0016wt% of Ti, less than or equal to 0.0070wt% of N, and the balance of Fe and inevitable impurities.
2. The steel for a steel cord having a tensile strength of 4000MPa or more according to claim 1, wherein: c: 0.90-1.00 wt%, Si: 0.15 to 0.30wt%, Mn: 0.20-0.60 wt%, P is less than or equal to 0.015wt%, S is less than or equal to 0.010wt%, Cr: 0.01 to 0.40wt%, Ni: 0.01 to 0.10wt%, Cu: 0.005-0.30 wt%, Al less than or equal to 0.0010wt%, Ti less than or equal to 0.0008wt%, N less than or equal to 0.0050wt%, and the balance of Fe and inevitable impurities.
3. A production method of steel for a steel cord with tensile strength of more than or equal to 4000MPa is characterized by comprising the following steps: the use of the composition according to claim 1 or 2,
continuous casting: adopting a 250mm multiplied by 300 mm-320 mm multiplied by 480mm rectangular blank, controlling the drawing speed to be 0.50-0.90 m/min during the production of a continuous casting machine, controlling the superheat degree of molten steel to be 15-35 ℃, controlling the specific water amount to be 0.10-0.60L/kg, and controlling the reduction under light pressure to be 10-30 mm, and adopting a crystallizer for electromagnetic stirring and solidification tail end electromagnetic stirring;
rolling the high-speed wire rods: the soaking temperature of a heating furnace of a wire rod factory is controlled to be 1120-1250 ℃, and the total in-furnace time is more than or equal to 2 hours; descaling, rough rolling, medium rolling, fine rolling and sizing reduction, cooling by adopting Steyr, controlling the wire rod spinning temperature to be 890-920 ℃, and controlling the pearlite phase transformation starting temperature to be 550-630 ℃; the cooling speed before phase change reaches 10-50 ℃/s; the cooling speed during the phase transition is-5 to 10 ℃/s.
4. The method for producing steel for a steel cord with tensile strength of 4000MPa or more according to claim 3, wherein the method comprises the following steps: the sorbite content of a metallographic structure is more than 90 percent, abnormal structures such as martensite, bainite and the like are avoided, the center segregation is not more than grade 1, and the grain boundary cementite is controlled within grade 1.
5. The method for producing steel for a steel cord with tensile strength of 4000MPa or more according to claim 3, wherein the method comprises the following steps: the specification of the wire rod is phi 5.0-phi 6.5 mm.
6. The method for producing steel for a steel cord with tensile strength of 4000MPa or more according to claim 3, wherein the method comprises the following steps: the method specifically comprises the following steps:
(1) pretreating molten iron: molten iron for primary smelting of an electric furnace or a converter is subjected to desulfurization pretreatment, the sulfur content is reduced to be below 0.005 percent by weight, and the molten iron is subjected to slagging-off treatment;
(2) smelting in a converter/electric furnace: controlling the content of P element in molten steel by adopting one-time slagging in the converter blowing process, and performing foam slag and flow slag changing operation by using an electric furnace, wherein the content of P element at the end point is less than or equal to 0.010 percent, and the content of S element is less than or equal to 0.010 percent;
(3) refining: refining the steel after the steel is tapped by a converter through an LF (ladle furnace) -RH (relative humidity) furnace, wherein the refining of the LF furnace adopts silicon and manganese deoxidization, and aluminum or aluminum-containing deoxidant deoxidization is strictly forbidden to reduce the equilibrium oxygen content in molten steel; slagging and regulating slag through pre-melted slag or lime and quartz sand, and controlling the alkalinity R of slag bodies to be 0.6-1.2;
(4) continuous casting;
(5) blank grinding: performing shot blasting and flaw detection on the continuous casting blank or the cogging stock, and polishing according to the surface condition of the continuous casting blank;
(6) and (4) rolling the wire rod at a high speed.
7. The method for producing steel for a steel cord with tensile strength of 4000MPa or more according to claim 6, wherein the method comprises the following steps: the continuous casting billet can be directly rolled at a high speed, and can also be cogging into 140 multiplied by 140mm2～180×180mm2And (5) rolling the square billet by using a high speed wire.
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| CN202111245682.9A CN114182164A (en) | 2021-10-26 | 2021-10-26 | Steel for steel cord with tensile strength of more than or equal to 4000MPa and production method |
| PCT/CN2022/105612 WO2023071299A1 (en) | 2021-10-26 | 2022-07-14 | Steel for steel cord having tensile strength greater than or equal to 4,000 mpa and production method |
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| CN202111245682.9A CN114182164A (en) | 2021-10-26 | 2021-10-26 | Steel for steel cord with tensile strength of more than or equal to 4000MPa and production method |
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| CN114182164A true CN114182164A (en) | 2022-03-15 |
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| WO2023071299A1 (en) * | 2021-10-26 | 2023-05-04 | 南京钢铁股份有限公司 | Steel for steel cord having tensile strength greater than or equal to 4,000 mpa and production method |
| CN117403131A (en) * | 2023-10-30 | 2024-01-16 | 南京钢铁股份有限公司 | Steel for steel cord with tensile strength not less than 4700MPa and production method |
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| WO2023071299A1 (en) | 2023-05-04 |
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