CN110669981B - Vanadium-boron composite microalloyed cord steel wire rod and production method thereof - Google Patents
Vanadium-boron composite microalloyed 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
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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
- B21B37/46—Roll speed or drive motor control
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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
- 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
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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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
Abstract
The invention discloses a vanadium-boron composite microalloyed cord steel wire rod and a production method thereof, wherein the wire rod comprises the following chemical components, by mass, 0.70-0.95% of C, 0.15-0.30% of Si, 0.35-0.50% of Mn, 0.02-0.08% of V, 0.0010-0.0025% of B, less than or equal to 0.015% of P, less than or equal to 0.015% of S, less than or equal to 0.005% of Alt, 5.0-9.0% of V/N ratio, and the balance of Fe and inevitable impurities. The production method comprises converter smelting, external refining, large square billet continuous casting, cogging and high-speed wire rolling. According to the invention, nitrogen in the steel is fixed by adding a trace amount of vanadium element, and then boron element is added, so that BN is prevented from being generated in the steel, and various properties of the wire rod meet requirements. Compared with the prior art, the cord steel produced by the method has the advantages of good mechanical property, good metallographic structure and strip passing property, low production cost and the like.
Description
Technical Field
The application belongs to the technical field of cord steel production, and particularly discloses a vanadium-boron composite microalloyed cord steel wire rod and a production method thereof.
Background
The steel cord is an ideal framework material for rubber products, in particular for radial tires of automobiles. The cord steel is the top quality of high-quality hard wire steel, is the representative product of ultra-clean steel and the marking product of the wire quality level of steel enterprises, and is known as 'best quality in wire', 'bright pearl on the wire crown'.
The hardenability of the steel can be improved by adding a small amount of boron element in the cord steel, and the steel cord steel can be used for producing a steel cord with higher strength and is beneficial to the light weight of an automobile. The boron element is added into the steel, and generally titanium is needed for fixing nitrogen, so that boron in the steel exists in a free boron form, the effect of boron can be exerted, BN can be generated in the steel if nitrogen is not fixed, the free boron is reduced, the effect of boron is not obvious, in addition, the difference of local free boron density is large, and the consistency of the metallographic structure and the mechanical property of the wire rod is poor. However, the addition of titanium to the cord steel cannot be used for nitrogen fixation because the inclusion of titanium nitride in the steel is strictly controlled and deteriorates the wire rod drawing performance. Chinese patent publication No. CN105063508B discloses a method for producing boron-containing cord steel, which is characterized in that: the chemical components by weight ratio are as follows: 0.89-0.96% of C, 0.14-0.30% of Si, 0.30-0.60% of Mn, less than or equal to 0.025% of P, less than or equal to 0.025% of S, less than or equal to 0.08% of Cu, less than or equal to 0.08% of Ni, 0.10-0.50% of Cr, 0.001-0.008% of Als, less than or equal to 0.08% of Mo, 0.0008-0.0035% of B, and the balance of Fe and impurity elements. The disadvantages are: 1. the method controls Als in the steel to be 0.001-0.008%, and aims to fix nitrogen by using aluminum to generate AlN and prevent generation of BN, so that boron plays a role in improving the hardenability of the steel. But aluminum in steel is easier to combine with oxygen to produce alumina, which is not beneficial to controlling alumina inclusions in the cord steel. At present, the aluminum content of common cord steel is controlled below 0.005%, and the aluminum oxide inclusion in the steel can be well controlled. 2. According to the method, nitrogen in steel cannot be completely fixed by using aluminum, a large amount of BN can be generated in the steel, and is precipitated at a crystal boundary, so that a casting blank generates a large amount of straightening cracks in a straightening area, and in order to ensure the surface quality of a wire rod, the casting blank has to be partially or fully polished, so that the production cost is increased. 3. According to the method, nitrogen in steel cannot be completely fixed by using aluminum, BN can be generated in the steel, so that the density difference of local free boron in the steel is large, and the consistency of the metallographic structure and the mechanical property of the cord wire steel wire rod is poor.
Disclosure of Invention
In order to solve the problems, the invention provides a vanadium-boron microalloyed cord steel wire rod and a production method thereof. The generation of BN is avoided by adding a small amount of vanadium to the steel to form V (C, N) for nitrogen fixation and then adding boron. In order to fully exert the nitrogen fixation effect of the vanadium element, the nitrogen element in the steel is completely fixed and exists in a fine V (C, N) form, so that the precipitation strengthening effect is realized, and the V/N ratio in the steel is controlled to be 5.0-9.0. Meanwhile, the aluminum content in the steel is strictly controlled (Alt is less than or equal to 0.005 percent), and the generation of alumina inclusions is avoided. The invention provides the following technical scheme:
a vanadium-boron composite microalloyed cord steel wire rod comprises, by mass, 0.70-0.95% of C, 0.15-0.30% of Si, 0.35-0.50% of Mn, 0.02-0.08% of V, 0.0010-0.0025% of B, less than or equal to 0.015% of P, less than or equal to 0.015% of S, less than or equal to 0.005% of Alt, 5.0-9.0% of V/N ratio, and the balance of Fe and inevitable impurities.
A production method of a vanadium-boron composite microalloyed cord steel wire rod adopts a converter smelting, LF refining, bloom continuous casting, cogging and high-speed wire rolling production process. Controlling the S content of the molten iron fed into the converter to be less than or equal to 0.005 percent, the temperature of the molten iron to be more than or equal to 1300 ℃, the final carbon content of the steel tapping to be 0.08-0.30 percent, the final temperature to be more than or equal to 1640 ℃, and adding low-aluminum and low-titanium alloy slag charge into the steel tapping of the converter. And (3) rapidly slagging is required during LF refining, the alkalinity of the refining slag is 1.04-1.08, ferrovanadium is added after the refining slag is brown, ferroboron is added after 3-5min, and the low-aluminum low-titanium alloy is added in the LF process.
When the bloom is continuously cast, protective casting is adopted; controlling the superheat degree of the molten steel to be 20-30 ℃; the pulling speed is 0.56-0.60 m/min; the secondary cooling specific water amount is 0.22-0.23L per kilogram of molten steel.
The cogging temperature is controlled to 1090-1120 ℃ in the cogging procedure; high wire rolling process, wherein the spinning temperature is 850-.
The invention has the following beneficial effects:
according to the invention, vanadium is added, the V/N ratio in the steel is controlled to be 5.0-9.0, and nitrogen in the steel can be completely fixed, so that boron exists in the steel uniformly in a free boron form, the generation of BN is avoided, the hardenability of the steel is effectively improved, and the consistency of the metallographic structure and the mechanical property of the wire rod is improved; meanwhile, the generation of straightening cracks in the continuous casting process is avoided, and the bloom blank can be directly rolled without being polished, so that the production cost is reduced.
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 a production method of a vanadium-boron microalloyed cord steel wire rod, which comprises the steps of converter smelting, LF refining, bloom continuous casting, cogging and high-speed wire rolling. The method comprises the following specific steps:
when smelting in a converter, the sulfur content of the charged molten iron is 0.005%, the temperature of the molten iron is 1305 ℃, the end point carbon of tapping is 0.08%, and the end point temperature is 1642 ℃.
The alkalinity of refining slag in LF refining is 1.05, ferrovanadium is added after the refining slag is brown, ferroboron is added after 3min, and the soft stirring time is 20 min.
When the bloom is continuously cast, a long water gap, argon seal, a tundish covering agent and an immersion water gap are adopted for protective casting; controlling the superheat degree of the molten steel to be 25 ℃; the height of the liquid level of the steel is 78 percent; the pulling speed is 0.60 m/min; the secondary cooling ratio water amount is 0.23L/Kg.
And in the cogging procedure, the cogging temperature is 1090 ℃, the water descaling pressure is 21MPa, and the furnace time of the casting blank is 280 min.
The spinning temperature in the high-speed wire rolling process is 860 ℃, the speed of a roller way at an inlet section is 1.3m/s, 6 fans before stelmor are started, the air volume is 85 percent, and the heat-insulating cover is fully opened.
The cord steel produced by the method comprises the following chemical components in percentage by mass: 0.72 percent of C, 0.20 percent of Si, 0.40 percent of Mn, 0.04 percent of V, 0.0015 percent of B, 0.012 percent of P, 0.008 percent of S, 0.003 percent of Alt, 7.5 percent of V/N ratio, and the balance of Fe and trace impurities. The surface quality of the bloom blank is good, no straightening crack is generated, and the casting blank does not need to be polished after cogging and can be directly rolled. The sorbite rate of the wire rod is more than or equal to 85 percent, and the fluctuation range of the tensile strength of the wire rod is less than or equal to 30 MPa.
Example 2
The embodiment provides a production method of a vanadium-boron microalloyed cord steel wire rod, which comprises the steps of converter smelting, LF refining, bloom continuous casting, cogging and high-speed wire rolling. The method comprises the following specific steps:
when smelting in a converter, the sulfur content of the charged molten iron is 0.004%, the temperature of the molten iron is 1308 ℃, the carbon at the end point of tapping is 0.10%, and the end point temperature is 1640 ℃.
The alkalinity of refining slag in LF refining is 1.08, ferrovanadium is added after the refining slag is brown, ferroboron is added after 4min, and the soft stirring time is 19 min.
When the bloom is continuously cast, a long water gap, argon seal, a tundish covering agent and an immersion water gap are adopted for protective casting; controlling the superheat degree of the molten steel to be 29 ℃; the height of the liquid level of the steel is 80 percent; the pulling speed is 0.56 m/min; the secondary cooling ratio water amount is 0.22L/Kg.
And a cogging process, wherein the cogging temperature is 1100 ℃, the water descaling pressure is 20MPa, and the furnace time of the casting blank is 300 min.
High wire rolling process, wherein the spinning temperature is 850 ℃, the roller table speed at the inlet section is 1.2m/s, 5 fans in front of stelmor are started, the air volume is 90%, and the heat-insulating cover is fully opened.
The cord steel produced by the method comprises the following chemical components in percentage by mass: 0.82% of C, 0.19% of Si, 0.45% of Mn, 0.06% of V, 0.0018% of B, 0.011% of P, 0.009% of S, 0.002% of Alt, 9.0% of V/N ratio, and the balance of Fe and trace impurities. The surface quality of the bloom blank is good, no straightening crack is generated, and the casting blank does not need to be polished after cogging and can be directly rolled. The sorbite rate of the wire rod is more than or equal to 90 percent, and the fluctuation range of the tensile strength of the wire rod is less than or equal to 35 MPa.
Example 3
The embodiment provides a production method of a vanadium-boron microalloyed cord steel wire rod, which comprises the steps of converter smelting, LF refining, bloom continuous casting, cogging and high-speed wire rolling. The method comprises the following specific steps:
when smelting in a converter, the sulfur content of the molten iron fed into the converter is 0.003 percent, the temperature of the molten iron is 1300 ℃, the end point carbon of tapping is 0.11 percent, and the end point temperature is 1640 ℃.
The alkalinity of refining slag in LF refining is 1.04, ferrovanadium is added after the refining slag is brown, ferroboron is added after 5min, and the soft stirring time is 23 min.
When the bloom is continuously cast, a long water gap, argon seal, a tundish covering agent and an immersion water gap are adopted for protective casting; controlling the superheat degree of the molten steel to be 23 ℃; the height of the liquid level of the steel is 78 percent; the pulling speed is 0.60 m/min; the secondary cooling ratio water amount is 0.23L/Kg.
And a cogging process, wherein the cogging temperature is 1110 ℃, the water descaling pressure is 20MPa, and the furnace time of the casting blank is 300 min.
The spinning temperature in the high-speed wire rolling process is 855 ℃, the speed of a roller way at an inlet section is 1.05m/s, 4 fans in front of stelmor are started, the air volume is 100%, and the heat-insulating cover is fully opened.
The cord steel produced by the method comprises the following chemical components in percentage by mass: 0.86% of C, 0.21% of Si, 0.42% of Mn, 0.08% of V, 0.0025% of B, 0.013% of P, 0.006% of S, 0.003% of Alt, 9.0% of V/N ratio and the balance of Fe and trace impurities. The surface quality of the bloom blank is good, no straightening crack is generated, and the casting blank does not need to be polished after cogging and can be directly rolled. The sorbite rate of the wire rod is more than or equal to 95 percent, and the fluctuation range of the tensile strength of the wire rod is less than or equal to 35 MPa.
Example 4
The embodiment provides a production method of a vanadium-boron microalloyed cord steel wire rod, which comprises the steps of converter smelting, LF refining, bloom continuous casting, cogging and high-speed wire rolling. The method comprises the following specific steps:
when smelting in a converter, the sulfur content of the molten iron fed into the converter is 0.005%, the temperature of the molten iron is 1310 ℃, the end point carbon of tapping is 0.09%, and the end point temperature is 1648 ℃.
The alkalinity of refining slag in LF refining is 1.06, ferrovanadium is added after the refining slag is brown, ferroboron is added after 4min, and the soft stirring time is 22 min.
When the bloom is continuously cast, a long water gap, argon seal, a tundish covering agent and an immersion water gap are adopted for protective casting; controlling the superheat degree of the molten steel to be 26 ℃; the height of the liquid level of the steel is 80 percent; the pulling speed is 0.60 m/min; the secondary cooling ratio water amount is 0.23L/Kg.
And a cogging process, wherein the cogging temperature is 1120 ℃, the water descaling pressure is 23MPa, and the in-furnace time of the casting blank is 290 min.
And (3) a high-speed wire rolling process, wherein the finish rolling inlet temperature is 905 ℃, the spinning temperature is 851 ℃, the roller table speed of an inlet section is 1.0m/s, 6 fans before stelmor are started, the air volume is 95%, and the heat-insulating cover is fully opened.
The cord steel produced by the method comprises the following chemical components in percentage by mass: 0.92% of C, 0.19% of Si, 0.50% of Mn, 0.07% of V, 0.0030% of B, 0.012% of P, 0.009% of S, 0.004% of Alt, 8.5% of V/N ratio, and the balance of Fe and trace impurities. The surface quality of the bloom blank is good, no straightening crack is generated, and the casting blank does not need to be polished after cogging and can be directly rolled. The sorbite rate of the wire rod is more than or equal to 95 percent, and the fluctuation range of the tensile strength of the wire rod is less than or equal to 35 MPa.
Although embodiments of the invention have been disclosed above, further modifications may readily occur to those skilled in the art, and the invention is therefore not limited to the specific details, without departing from the general concept defined by the claims and their equivalents.
Claims (3)
1. A vanadium-boron composite microalloyed cord steel wire rod comprises, by mass, 0.70-0.95% of C, 0.15-0.30% of Si, 0.35-0.50% of Mn, 0.02-0.08% of V, 0.0010-0.0025% of B, less than or equal to 0.015% of P, less than or equal to 0.015% of S, less than or equal to 0.005% of Alt, 5.0-9.0% of V/N ratio, and the balance of Fe and inevitable impurities; the production method of the vanadium-boron composite microalloyed cord steel wire rod adopts the production processes of converter smelting, LF refining, bloom continuous casting, cogging and high-speed wire rolling, and controls the S content of molten iron fed into a furnace to be less than or equal to 0.005 percent, the temperature of the molten iron to be more than or equal to 1300 ℃, the carbon content at the end point of tapping to be 0.08-0.30 percent and the tapping temperature to be more than or equal to 1640 ℃; rapidly slagging is required during LF refining, the alkalinity of refining slag is 1.04-1.08, ferrovanadium is added after the refining slag is brown, and ferroboron is added after 3-5 min; the spinning temperature is 850-.
2. The vanadium boron composite microalloyed cord steel wire rod according to claim 1, characterized in that: when the bloom is continuously cast, protective casting is adopted; controlling the superheat degree of the molten steel to be 20-30 ℃; the pulling speed is 0.56-0.60 m/min; the secondary cooling specific water amount is 0.22-0.23L per kilogram of molten steel.
3. The vanadium boron composite microalloyed cord steel wire rod according to claim 1, characterized in that: the cogging temperature is controlled to be 1090-1120 ℃ in the cogging procedure.
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| CN112275796B (en) * | 2020-09-03 | 2023-03-24 | 太原钢铁(集团)有限公司 | Method for improving rolling surface quality of nickel-based alloy wire |
| CN112342452B (en) * | 2020-10-15 | 2021-11-02 | 中天钢铁集团有限公司 | Manufacturing method of high-strength wire rod for tire bead steel wire |
| CN112899565B (en) * | 2020-10-22 | 2022-05-17 | 江苏省沙钢钢铁研究院有限公司 | Wire rod for 5000MPa grade diamond wire and production method thereof |
| CN113088798A (en) * | 2021-03-31 | 2021-07-09 | 江苏省沙钢钢铁研究院有限公司 | High-carbon steel wire rod and production method thereof |
| CN114182164A (en) * | 2021-10-26 | 2022-03-15 | 南京钢铁股份有限公司 | Steel for steel cord with tensile strength of more than or equal to 4000MPa and production method |
| CN115795983A (en) * | 2023-01-29 | 2023-03-14 | 江苏沙钢集团有限公司 | Wire quality control method, device, equipment and storage medium |
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