CN110747386B - Easy-to-pull cord steel wire rod and production method thereof - Google Patents
Easy-to-pull cord steel wire rod and production method thereof Download PDFInfo
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- 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
- C22C33/06—Making ferrous alloys by melting using master alloys
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
- C21D8/065—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires of ferrous alloys
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/525—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length for wire, for rods
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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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
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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
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/009—Pearlite
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- 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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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
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- Crystallography & Structural Chemistry (AREA)
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Abstract
The invention discloses an easy-to-draw cord steel wire rod and a production method thereof, wherein the rough drawing speed of the cord steel wire rod is 8-10m/s, the middle drawing speed is 18-22m/s, the wet drawing speed is 18-20m/s, and the filament breakage rate is less than or equal to 1 time/100 t. The quality of molten iron and scrap steel entering a furnace is strictly controlled, and reasonable molten steel superheat degree, continuous casting cooling strength, heavy pressing amount, grinding process and high-speed wire rolling cooling system are set, so that the wire rod reticular cementite is less than or equal to 1.0 grade, the sorbite rate is greater than or equal to 95 percent, the pro-eutectoid ferrite is less than 0.5 percent, the strength fluctuation range is less than or equal to 15MPa, the surface defect depth is less than or equal to 0.05mm, and the defect ratio is less than or equal to 0.8 percent.
Description
Technical Field
The application belongs to the technical field of cord steel production, and particularly relates to an easily pulled cord steel wire rod and a production method thereof.
Background
The high-speed drawing ensures lower wire breakage rate, can obviously improve the production efficiency and reduce the processing cost, thereby being the technical development trend in the wire processing field.
High speed drawing places higher demands on the quality level of the wire rod. For example, high-speed drawing has very high requirements on continuity and uniformity of the structure of the wire rod, and stress is not uniform at a certain position of the wire rod in the high-speed drawing process, so that stress concentration is easily generated at a weak link, and then a radial shrinkage broken wire is generated; the minute defects do not affect the stress conduction at a low strain rate, but the minute defects obstruct the stress transmission when drawing at a high speed to generate stress concentration at the defects to cause the breakage of the wire. Therefore, the higher the drawing speed, the higher the requirement for the structural uniformity of the wire rod. Cleanliness, center segregation and surface defects are the main factors that contribute to tissue continuity and uniformity.
The cord steel is a representative product of ultra-clean steel and a symbolic product of the quality level of wire rods of steel enterprises, is known as 'best quality in wire rods' and 'bright pearl on crown of wire rods', and is mainly used for manufacturing tire meridian lines. The cord steel produced by the prior art cannot well meet the requirement of high-speed drawing.
Disclosure of Invention
The easy-to-draw cord steel wire rod and the production method provided by the invention have the advantages that the cleanliness of the wire rod is effectively improved, the center segregation degree of the wire rod is reduced, and the surface quality of the wire rod is improved. On the premise of ensuring that the broken wire is not obviously deteriorated, the drawing speed of the cord steel is obviously improved.
An easy-to-draw steel wire rod for cord thread features that its netted cementite is less than or equal to 1.0 grade, its sorbite percentage is greater than or equal to 95%, the proeutectoid ferrite is less than 0.5% and its strength fluctuation range is less than or equal to 15 MPa. The surface defect depth of the wire rod is less than or equal to 0.05mm, the defect ratio (defect length/wire rod length) is less than or equal to 0.8%, the rough drawing speed of the wire rod is 8-10m/s, the middle drawing speed is 18-22m/s, the wet drawing speed is 18-20m/s, and the broken wire rate is less than or equal to 1 time/100 t.
The production method of the easy-to-draw cord steel wire rod comprises molten iron KR desulfurization, converter steelmaking, LF refining, bloom continuous casting, cogging, coping and rolling.
Before molten iron desulphurization, the molten iron requirement is as follows: the temperature is more than or equal to 1350 ℃, S is less than or equal to 0.045%, and Ti is less than or equal to 0.08%; after desulfurization, the molten iron requires: the temperature is more than or equal to 1300 ℃, the S is less than or equal to 0.005 percent, and the Ti is less than or equal to 0.09 percent.
Smelting in a converter, wherein the molten iron ratio is more than or equal to 90%; the steel scrap requirements are as follows: less than or equal to 0.020 percent of S, less than or equal to 0.01 percent of Ti and less than or equal to 0.030 percent of Al; the alkalinity of the converter final slag is 3.5-4.5, the tapping temperature is 1640-.
The alkalinity of LF refining slag is 1.0-1.04, the brown slag time is 25-35min, the soft stirring time is 20-30min, and the molten steel is strictly forbidden to be exposed.
Ensuring the superheat degree of the molten steel to be 18-28 ℃ during continuous casting; the height of the liquid level of the steel is 80-85%; the pulling speed is 0.60-0.64 m/min; the specific water amount of the secondary cooling is 0.23-0.24L/Kg; the reduction under heavy reduction is more than or equal to 7.5% (reduction as reduction size/casting height).
The casting blank is mechanically and fully ground for at least two times, wherein the first time is ground by a 16-mesh grinding wheel, and the second time is ground by a 24-mesh grinding wheel; high-speed wire rolling, wherein the spinning temperature is 890-920 ℃, and a three-section stelmor cooling system is adopted: and cooling by adopting 100% of air flow between the spinning temperature and 600 ℃, cooling by adopting 30-50% of air flow between 600 ℃ and 500 ℃, and closing the fan and the heat-insulating cover below 500 ℃.
Has the advantages that:
based on conventional production equipment, the purpose of the invention can be realized only by reasonably designing production parameters without additional investment;
the cord steel wire rod produced by the production method provided by the invention has excellent drawing performance, and the drawing speed is improved while the wire breakage rate is ensured to be at a lower level.
Detailed Description
The invention is further illustrated by the following examples: the invention will be better understood from the following examples. However, those skilled in the art will readily appreciate that the specific material ratios, process conditions and results thereof described in the examples are illustrative only and should not be taken as limiting the invention as detailed in the claims.
Example 1
The embodiment provides an easy-to-draw cord steel LX72A wire rod, wherein LX72A wire rod reticular cementite is 0 grade, the sorbite percentage is 98 percent, the pro-eutectoid ferrite is 0.1 percent, and the strength fluctuation range is 12 MPa; the surface defect depth of the wire rod is 0.02mm, and the defect ratio is 0.1%. A production method of an easy-to-pull cord steel LX72A wire rod. The method comprises KR desulfurization of molten iron, steelmaking in a converter, LF refining, continuous casting of a bloom, cogging, coping and rolling. The method comprises the following specific steps:
molten iron KR desulfurization process:
molten iron before desulfurization: the temperature is 1360 ℃, the S content is 0.04 percent, and the Ti content is 0.08 percent; molten iron after desulfurization: the temperature is 1310 ℃, the S content is 0.004 percent, and the Ti content is 0.09 percent.
A converter smelting process:
the molten iron ratio is 90 percent; the content of S in the scrap steel is 0.020%, the content of Ti in the scrap steel is 0.008% and the content of Al in the scrap steel is 0.025%; the alkalinity of the converter final slag is 3.5, the tapping temperature is 1645 ℃, the end point carbon content is 0.10 percent, and alloy material and slag material are added when 1/3 steel is tapped.
An LF refining procedure:
the alkalinity of LF refining slag is 1.03, the brown slag time is 30min, the soft stirring time is 25min, and the molten steel is strictly prohibited from being exposed.
And a bloom continuous casting process:
adopting a long water gap, argon sealing, a tundish covering agent and an immersion water gap for protective casting; the superheat degree of the molten steel is 23 ℃; the electromagnetic stirring current of the crystallizer is 750A, and the frequency is 1.5 Hz; the height of the liquid level of the steel is 82 percent; the pulling speed is 0.60 m/min; the secondary cooling water ratio is 0.23L/Kg; the reduction by weight was 7.5% (reduction ═ reduction size/strand height).
The coping process comprises the following steps:
and the casting blank is mechanically and fully ground twice, wherein the first time adopts a 16-mesh grinding wheel for grinding, and the second time adopts a 24-mesh grinding wheel for grinding.
High-speed wire rolling procedure:
the finish rolling inlet temperature is 1000 ℃, the spinning temperature is 900 ℃, and a three-stage stelmor cooling system is adopted: cooling with 100% air flow between the spinning temperature and 600 ℃, cooling with 50% air flow between 600 ℃ and 500 ℃, and closing the fan and the heat-insulating cover below 500 ℃.
Example 2
The embodiment provides an easy-to-draw cord steel LX82A wire rod, wherein the mesh cementite of the wire rod is 0.5 grade, the sorbitizing rate is 99 percent, the pro-eutectoid ferrite is 0.1 percent, and the strength fluctuation range is 13 MPa; the surface defect depth of the wire rod is 0.03mm, and the defect ratio is 0.3%.
A production method of an easy-to-pull cord steel LX82A wire rod. The method comprises KR desulfurization of molten iron, steelmaking in a converter, LF refining, continuous casting of a bloom, cogging, coping and rolling. The method comprises the following specific steps:
molten iron KR desulfurization process:
molten iron before desulfurization: the temperature is 1365 ℃, the S content is 0.035%, and the Ti content is 0.06%; molten iron after desulfurization: the temperature was 1311 ℃, the S content was 0.003%, and the Ti content was 0.07%.
A converter smelting process:
the molten iron ratio is 91%; 0.015 percent of S content, 0.01 percent of Ti content and 0.020 percent of Al content in the scrap steel; the alkalinity of the converter final slag is 3.8, the tapping temperature is 1648 ℃, the end point carbon content is 0.11 percent, and alloy material and slag material are added when 1/3 steel is tapped.
An LF refining procedure:
the alkalinity of LF refining slag is 1.05, the brown slag time is 32min, the soft stirring time is 28min, and the molten steel is strictly prohibited from being exposed.
And a bloom continuous casting process:
adopting a long water gap, argon sealing, a tundish covering agent and an immersion water gap for protective casting; the superheat degree of the molten steel is 25 ℃; the electromagnetic stirring current of the crystallizer is 750A, and the frequency is 1.5 Hz; the height of the liquid level of the steel is 81 percent; the pulling speed is 0.64 m/min; the secondary cooling specific water amount is 0.24L/Kg; the reduction by weight was 7.8% (reduction ═ reduction size/strand height).
The coping process comprises the following steps:
and the casting blank is mechanically and fully ground twice, wherein the first time adopts a 16-mesh grinding wheel for grinding, and the second time adopts a 24-mesh grinding wheel for grinding.
High-speed wire rolling procedure:
the inlet temperature of finish rolling is 1010 ℃, the spinning temperature is 910 ℃, and a three-section stelmor cooling system is adopted: cooling with 100% air flow between the spinning temperature and 600 ℃, cooling with 40% air flow between 600 ℃ and 500 ℃, and closing the fan and the heat-preservation cover below 500 ℃.
Example 3
The embodiment provides an easy-to-draw cord steel LX86A wire rod, wherein the mesh cementite of the wire rod is 1.0 grade, the sorbitizing rate is 99 percent, the pro-eutectoid ferrite is 0.1 percent, and the strength fluctuation range is 15 MPa; the surface defect depth of the wire rod is 0.02mm, and the defect ratio is 0.4%. The rough drawing speed is 8m/s, the middle drawing speed is 18m/s, the wet drawing speed is 18m/s, and the yarn breakage rate is 1 time/100 t.
A production method of an easy-to-pull cord steel LX86A wire rod. The method comprises KR desulfurization of molten iron, steelmaking in a converter, LF refining, continuous casting of a bloom, cogging, coping and rolling. The method comprises the following specific steps:
molten iron KR desulfurization process:
molten iron before desulfurization: the temperature is 1360 ℃, the S content is 0.04 percent, and the Ti content is 0.07 percent; molten iron after desulfurization: the temperature is 1308 ℃, the S content is 0.004 percent, and the Ti content is 0.06 percent.
A converter smelting process:
the molten iron ratio is 93 percent; the content of S in the scrap steel is 0.020%, the content of Ti is 0.008% and the content of Al is 0.028%; the alkalinity of the converter final slag is 4.0, the tapping temperature is 1642 ℃, the end point carbon content is 0.10 percent, and alloy material and slag material are added when 1/3 steel is tapped.
An LF refining procedure:
the alkalinity of LF refining slag is 1.03, the brown slag time is 31min, the soft stirring time is 21min, and the molten steel is strictly prohibited from being exposed.
And a bloom continuous casting process:
adopting a long water gap, argon sealing, a tundish covering agent and an immersion water gap for protective casting; the superheat degree of the molten steel is 25 ℃; the electromagnetic stirring current of the crystallizer is 750A, and the frequency is 1.5 Hz; the height of the liquid level of the steel is 81 percent; the pulling speed is 0.60 m/min; the secondary cooling water ratio is 0.23L/Kg; the reduction by weight was 7.5% (reduction ═ reduction size/strand height).
The coping process comprises the following steps:
and the casting blank is mechanically and fully ground twice, wherein the first time adopts a 16-mesh grinding wheel for grinding, and the second time adopts a 24-mesh grinding wheel for grinding.
High-speed wire rolling procedure:
the inlet temperature of finish rolling is 1000 ℃, the spinning temperature is 920 ℃, and a three-stage stelmor cooling system is adopted: cooling with 100% air flow between the spinning temperature and 600 ℃, cooling with 30% air flow between 600 ℃ and 500 ℃, and closing the fan and the heat-preservation cover below 500 ℃.
LX86A wire rod net cementite is 1.0 grade, the sorbite rate is 99 percent, the proeutectoid ferrite is 0.1 percent, and the intensity fluctuation range is 15 MPa; the surface defect depth of the wire rod is 0.02mm, and the defect ratio is 0.4%.
To better illustrate the easy-pull performance of the steel wire rod for the cord in the embodiment of the present invention, LX72A, LX82A and LX86A materials were purchased in the market as comparative examples and pulled under the same production conditions, and the results are shown in table 1 below. As can be seen from Table 1, the cord steel wire rod produced by the production method provided by the invention has excellent drawing performance, the drawing speed is obviously improved, and meanwhile, the wire breakage rate can be ensured to be at a lower level.
TABLE 1
Finally, it should be further noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Claims (3)
1. A production method of an easy-to-pull cord steel wire rod is characterized by comprising the following steps: the production method comprises the following steps: KR desulfurization of molten iron, smelting in a converter, LF refining, continuous casting of a bloom, cogging, coping and high-speed wire rolling;
molten iron KR desulfurization process:
before desulfurization, molten iron requires: the temperature is more than or equal to 1350 ℃, S is less than or equal to 0.045%, and Ti is less than or equal to 0.08%; after desulfurization, the molten iron requires: the temperature is more than or equal to 1300 ℃, the S is less than or equal to 0.005 percent, and the Ti is less than or equal to 0.09 percent;
a converter smelting process:
the molten iron ratio is more than or equal to 90 percent; the alkalinity of the converter final slag is 3.5-4.5, the tapping temperature is 1640-1660 ℃, and the end point carbon content is 0.08-0.30%; the steel scrap requirements are as follows: less than or equal to 0.020 percent of S, less than or equal to 0.01 percent of Ti and less than or equal to 0.030 percent of Al;
an LF refining procedure:
the alkalinity of LF refining slag is 1.0-1.04, the brown slag time is 25-35min, and the soft stirring time is 20-30 min;
and a bloom continuous casting process:
the superheat degree of the molten steel is 18-28 ℃; the height of the liquid level of the steel is 80-85%; the pulling speed is 0.60-0.64 m/min; the specific water amount of the secondary cooling is 0.23-0.24L/Kg; the reduction under the heavy pressure is more than or equal to 7.5 percent;
the coping process comprises the following steps:
the casting blank is mechanically polished for at least two times; grinding by adopting a 16-mesh grinding wheel for the first time, and grinding by adopting a 24-mesh grinding wheel for the second time;
high-speed wire rolling procedure:
the spinning temperature is 890-920 ℃, and a three-stage stelmor cooling system is adopted: cooling with 100% air flow between spinning temperature and 600 deg.C, cooling with 30-50% air flow between 600 deg.C and 500 deg.C, and closing the blower and the heat-insulating cover below 500 deg.C;
the steel wire rod of the easy-to-draw cord is drawn at a rough drawing speed of 8-10m/s, a medium drawing speed of 18-22m/s, a wet drawing speed of 18-20m/s and a filament breakage rate of less than or equal to 1 time/100 t.
2. The method for producing an easy-to-draw steel wire rod for cord thread according to claim 1, wherein the mesh cementite of the wire rod is less than or equal to 1.0 grade, the sorbitizing rate is greater than or equal to 95 percent, the pro-eutectoid ferrite is less than 0.5 percent, and the strength fluctuation range is less than or equal to 15 MPa.
3. The method for producing an easily drawn cord steel wire rod according to claim 1, wherein the surface defect depth of the wire rod is less than or equal to 0.05mm, and the defect length/wire rod length is less than or equal to 0.8%.
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| CN112501498A (en) * | 2020-10-20 | 2021-03-16 | 江苏省沙钢钢铁研究院有限公司 | Wire rod for 2300MPa prestressed steel strand and production method thereof |
| CN112620385B (en) * | 2020-11-25 | 2022-07-22 | 江苏省沙钢钢铁研究院有限公司 | Steel cord with grade of more than 90, cord steel and production method thereof |
| CN113770652B (en) * | 2021-09-13 | 2024-04-02 | 泰州市新龙翔金属制品有限公司 | Energy-saving disc round steel processing technology |
| CN113862564A (en) * | 2021-09-16 | 2021-12-31 | 湖南华菱湘潭钢铁有限公司 | Production method of deep-drawing high-carbon steel wire rod |
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| CN102352469A (en) * | 2011-11-03 | 2012-02-15 | 江苏省沙钢钢铁研究院有限公司 | Ultrahigh-strength vanadium-titanium composite microalloyed high carbon steel wire rod and preparation method thereof |
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| JPH02213448A (en) * | 1989-02-15 | 1990-08-24 | Kawasaki Steel Corp | High-carbon steel wire rod combining adhesive strength of secondary scale after hot rolling with mechanical descaling property before wiredrawing |
| CN102409228B (en) * | 2010-09-20 | 2014-04-02 | 鞍钢股份有限公司 | High-strength high-carbon steel wire rod and production method thereof |
| CN102534094B (en) * | 2012-01-01 | 2013-05-22 | 首钢总公司 | Method for producing tire cord steel wire by converter billet continuous casting process |
| CN103817148B (en) * | 2013-12-19 | 2016-03-09 | 江苏省沙钢钢铁研究院有限公司 | A kind of control method reducing cord wire rod network cementite |
| CN107442596B (en) * | 2017-07-11 | 2019-05-28 | 山东大业股份有限公司 | A kind of steel cord production method |
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| CN102352469A (en) * | 2011-11-03 | 2012-02-15 | 江苏省沙钢钢铁研究院有限公司 | Ultrahigh-strength vanadium-titanium composite microalloyed high carbon steel wire rod and preparation method thereof |
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