CN110453153B - Low-cost cord steel wire rod and production method thereof - Google Patents

Low-cost cord steel wire rod and production method thereof Download PDF

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Publication number
CN110453153B
CN110453153B CN201910822071.2A CN201910822071A CN110453153B CN 110453153 B CN110453153 B CN 110453153B CN 201910822071 A CN201910822071 A CN 201910822071A CN 110453153 B CN110453153 B CN 110453153B
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wire rod
steel
billet
rolling
continuous casting
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CN110453153A (en
Inventor
郭大勇
高航
车安
韩立涛
王秉喜
赵学博
张博
马立国
常宏伟
李凯
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Angang Steel Co Ltd
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Angang Steel Co Ltd
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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
    • 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
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • 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
    • 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
    • C22C38/14—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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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical 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)
  • Metal Rolling (AREA)

Abstract

The invention provides a low-cost cord steel wire rod and a production method thereof, wherein the wire rod comprises the following components in percentage by weight: [C] 0.80-0.83%, 0.15-0.25% of [ Si ], 0.45-0.50% of [ Mn ], less than or equal to 0.015% of [ P ], less than or equal to 0.010% of [ S ], 0.0008-0.0025% of [ Al ], 0.0005-0.0010% of [ Ti ] and 0.0010-0.0030% of total oxygen; the balance of Fe and inevitable impurities. The production method comprises smelting, continuous casting, billet heating, wire rod rolling and wire rod cooling, under the premise of ensuring the quality of the cord wire steel wire rod, the molten steel of the cord wire steel is refined without adopting vacuum treatment measures such as RH or VD and the like, and the cord wire steel wire rod is directly rolled by adopting a continuous casting billet, so that the production cost of the cord wire steel wire rod is reduced.

Description

Low-cost cord steel wire rod and production method thereof
Technical Field
The invention belongs to the field of metal materials, and particularly relates to a low-cost cord steel wire rod and a production method thereof.
Background
With the rapid development of automobile industry in China, the demand and quality requirements for steel wire rods for automobile tires are continuously increased. With the increasing market competition, steel cord manufacturers have an increasing demand for cost reduction of cord steel wire rods. Steel cord manufacturers need to meet the quality requirements of users and continuously reduce the production cost of the wire rod through technical innovation, so that the market competitiveness of the wire rod is improved.
The invention discloses a high-carbon steel wire rod for producing thin steel wires (application number: CN201010201612.9), which comprises the following chemical components in percentage by weight: [C] the method comprises the following steps 0.6% to 0.88%, [ Si ]: 0.1% to 1.0%, [ Mn ]: 0.3 to 1.0 percent, less than or equal to 0.015 percent of [ P ], lessthan or equal to 0.010 percent of [ S ], lessthan or equal to 0.020 percent of [ P + S ], lessthan or equal to 0.004 percent of [ N ], lessthan or equal to 0.002 percent of [ O ], lessthan or equal to 0.002 percent of [ Al ], lessthan or equal to 0.002 percent of [ Ti ], lessthan or equal to 0.001 percent of [ Mg ], other inevitable impurities are not more than 0.1 percent, and the balance of iron. The high-carbon steel wire rod has reasonable component design, excellent processing performance, low melting point of inclusions in the wire rod, elongation along the rolling direction in the hot rolling process, and length-width ratio larger than 3, and can reduce the wire breakage rate of a steel wire processing process by 16-28%.
Said invention introduces the control scheme of chemical composition of wire rod and deformation property of impurity so as to attain the goal of reducing wire-breaking rate in the course of wire rod processing. The above patent does not describe the technical measures and solutions taken to reduce the cost of producing the cord steel wire rod.
In order to improve the market competitiveness of the cord steel wire rod, research for reducing the production cost of the cord steel wire rod is necessary under the precondition of ensuring the quality of the cord steel wire rod.
Disclosure of Invention
The invention aims to overcome the problems and the defects and provide a low-cost cord steel wire rod and a production method thereof. The production cost of the cord steel wire rod is reduced through the optimization and improvement of the refining and rolling process.
The purpose of the invention is realized as follows:
a low cost cord steel wire rod, the composition of which by weight percent is as follows: [C] 0.80-0.83%, 0.15-0.25% of [ Si ], 0.45-0.50% of [ Mn ], less than or equal to 0.015% of [ P ], less than or equal to 0.010% of [ S ], 0.0008-0.0025% of [ Al ], 0.0005-0.0010% of [ Ti ] and 0.0010-0.0030% of total oxygen; the balance of iron and inevitable impurities.
The microstructure of the wire rod is sorbite, troostite, ferrite and pearlite, wherein the sorbite content is controlled to be 75-90%, the troostite content is not more than 5%, and the ferrite content is not more than 10%.
The invention has the following design reasons:
the invention is suitable for the cord steel wire rod with the carbon content of 0.80-0.83 percent. The drawing strength requirement of a steel wire of a user cannot be met due to the excessively low carbon content of the wire rod, and the wire breakage rate in the production process of the steel wire is increased due to the excessively high carbon content; the steel cord wire rod directly produced by the continuous casting billet is not heated by two fires, so the loosening degree of the inner part of the wire rod is higher than that of the cord wire steel wire rod produced by a bloom continuous casting-continuous rolling process. The carbon content of the wire rod is properly controlled, so that the wire rod has higher drawability, and the wire rod is prevented from being broken in drawing due to the fact that the internal structure of the wire rod is not dense. Therefore, the carbon content control range of the invention is 0.80-0.83%.
Silicon is the main deoxidizing element in high carbon steel. The low silicon content in the steel can lead to insufficient deoxidation of the steel, and the billet steel shows the formation of casting blank defects such as pinhole bubbles and the like; the silicon content in the steel is too high, and coarse silicate and impurities can appear after the molten steel is deoxidized. Therefore, the silicon content in the patented steel is controlled to be 0.15-0.25%.
Manganese is also an element that improves the strength of the wire rod; however, segregation of manganese element in the solidification process is serious, which is not beneficial to improving the cold processing performance of the wire rod. The steel cord wire rod directly produced by the continuous casting billet is not heated by two fires, so the loosening degree of the inner part of the wire rod is higher than that of the cord wire steel wire rod produced by a bloom continuous casting-continuous rolling process. The manganese content of the wire rod is properly controlled, so that the wire rod has higher drawability, and the wire rod is prevented from being broken in drawing due to the fact that the internal structure of the wire rod is not dense. Therefore, the manganese content in the steel is controlled to be 0.45-0.50%.
Phosphorus and sulfur are harmful impurity elements in steel, and the lower the content, the better the content without causing other influences. The patent of the invention requires that the wire rod [ P ] is less than or equal to 0.015 percent and [ S ] is less than or equal to 0.010 percent.
Aluminum is a strong deoxidizing element, and the high content of aluminum can cause the deformation of inclusions in steel to be deteriorated; however, a certain amount of aluminum is also required in the steel to improve the deformability of the oxide inclusions. Therefore, the aluminum content of the wire rod is controlled to be 0.0008 to 0.0025 percent. The control of the total oxygen content in the wire rod is similar to the aluminum content, so the total oxygen content of the wire rod is controlled to be 0.0010 to 0.0030 percent.
Titanium is a strong deoxidizing element and has a deoxidizing effect on molten steel. However, too high a titanium content may lead to the formation of high-melting inclusions in the steel, which are poor in deformability and tend to cause wire breakage during cold working of the wire rod. Therefore, the titanium content of the wire rod is controlled to be 0.0005 to 0.0010 percent.
The wire rod structure mainly adopts a sorbite body to facilitate cold processing operations such as drawing and stranding of the wire rod. Cooling of the wire rod is accompanied by the formation of sorbite, which is generally accompanied by the appearance of troostite. A small amount of troostite is beneficial to improving the drawing performance of the wire rod, but the wire breakage rate of the wire rod in the drawing process is increased due to the fact that the content of troostite is too high. In addition, a ferrite structure appears on the wire rod after cooling due to segregation and the like, and the excessive structure can cause the uniformity of the wire rod structure to be reduced, which is not beneficial to the improvement of the stability of the cold processing performance of the wire rod; therefore, the sorbite content of the wire rod is controlled to be 75-90%, the troostite content is not more than 5%, and the ferrite content is not more than 10%.
The second technical scheme of the invention is to provide a production method of a low-cost cord steel wire rod, comprising the steps of smelting, continuous casting, billet heating, wire rod rolling and wire rod cooling
1) Smelting and continuous casting: after the molten steel is smelted by the converter, the molten steel is refined by LF, and the refining time is not less than 30 minutes. And (3) blowing argon after the molten steel is refined in an LF furnace, wherein the treatment time is not less than 25min, and the molten steel is directly continuously cast without VD or RH refining after being refined.
2) Heating a steel billet: the wire rod is produced by adopting a continuous casting square billet, the heating speed of a steel billet is 0.90min/mm-1.25min/mm, and the temperature of a soaking section is 1050 ℃ -1120 ℃; reducing the segregation of elements such as carbon, manganese and the like through billet high-temperature diffusion;
3) rolling a wire rod: after the billet is heated, the wire rod spinning operation is carried out after rough rolling, medium rolling, pre-finish rolling and finish rolling. The wire rod spinning temperature is controlled to be 890-930 ℃. The cooling speed of the wire rod on the air cooling roller way is improved by the higher spinning temperature of the wire rod, and a foundation is laid for controlling the final organization of the wire rod.
4) Cooling the wire rod: after spinning, the wire rod is cooled in the air, and is cooled on an air cooling roller way, the phase change temperature of the wire rod is controlled to be 600-650 ℃, the phase change time is controlled to be 12-18 s, and the cord steel wire rod is 75-90% in sorbite structure, so that a user can draw steel wires conveniently.
The invention has the beneficial effects that through the design of the chemical components of the wire rod and the production process, on the premise of ensuring the quality of the wire rod, the refining of the molten steel of the wire rod does not adopt RH or VD and other vacuum treatment measures, and the wire rod is directly rolled by adopting a continuous casting billet, so that the production cost of the wire rod is reduced, and the market competitiveness of the wire rod is improved. The tensile strength of the wire rod is 1100MPa-1200MPa, the surface shrinkage is not lower than 30%, and the level of inclusions is not higher than 1. The inclusion grade of the wire rod produced by the VD vacuum treatment process reaches 2 grade at most, which shows that the steel cleanliness of the wire rod produced by the process is improved.
Detailed Description
The present invention is further illustrated by the following examples.
According to the embodiment of the invention, smelting, continuous casting, billet heating, wire rod rolling and wire rod cooling are carried out according to the component proportion of the technical scheme. The composition of the wire rod of the examples of the present invention is shown in Table 1. The main process parameters of the wire rod of the embodiment of the invention are shown in table 2. The properties and structure of the steels of the examples of the invention are shown in Table 3.
Table 1 composition of wire rods of examples of the invention
Examples C，％ Si，％ Mn，％ P，％ S，％ Al，％ Ti，％ Total oxygen content%
1 0.81 0.19 0.46 0.011 0.0071 0.0008 0.0005 0.0024
2 0.83 0.22 0.50 0.0096 0.0092 0.0020 0.0007 0.0018
3 0.82 0.17 0.47 0.012 0.0087 0.0010 0.0009 0.0017
4 0.80 0.18 0.49 0.0081 0.0089 0.0009 0.0008 0.0018
Table 2 main process parameters of wire rod of the embodiment of the present invention
Figure BDA0002187837940000051
Table 3 properties and organization of wire rods of embodiments of the invention
Figure BDA0002187837940000052
In order to express the present invention, the above embodiments are properly and fully described by way of examples, and the above embodiments are only used for illustrating the present invention and not for limiting the present invention, and those skilled in the relevant art can make various changes and modifications without departing from the spirit and scope of the present invention, and any modifications, equivalent substitutions, improvements, etc. made by the persons skilled in the relevant art should be included in the protection scope of the present invention, and the protection scope of the present invention should be defined by the claims.

Claims (1)

1. A low-cost cord steel wire rod is characterized in that the wire rod comprises the following components in percentage by weight: [C] 0.80-0.83%, 0.15-0.19% of [ Si ], 0.46-0.50% of [ Mn ], less than or equal to 0.015% of [ P ], less than or equal to 0.010% of [ S ], 0.0009-0.0025% of [ Al ], 0.0007-0.0010% of [ Ti ] and 0.0010-0.0030% of total oxygen; the balance of Fe and inevitable impurities; the microstructure of the wire rod is sorbite, troostite, ferrite and pearlite, wherein the sorbite content is controlled to be 75-90%, the troostite content is not more than 5%, and the ferrite content is not more than 10%;
the production method of the wire rod comprises smelting, continuous casting, billet heating, wire rod rolling and wire rod cooling;
1) smelting and continuous casting: after the molten steel is smelted by a converter, refining is carried out through LF, the refining time is not less than 30 minutes, after the molten steel is refined in the LF, argon blowing treatment is carried out, the treatment time is not less than 25 minutes, and after the molten steel is refined, continuous casting is directly carried out without VD or RH refining;
2) heating a steel billet: the wire rod is produced by adopting a continuous casting square billet, the heating speed of a steel billet is 0.90min/mm-1.25min/mm, and the temperature of a soaking section is 1050 ℃ -1120 ℃;
3) rolling a wire rod: heating a billet, carrying out rough rolling, medium rolling, pre-finish rolling and finish rolling, and then carrying out wire rod spinning operation; controlling the spinning temperature of the wire rod to be 911-930 ℃;
4) cooling the wire rod: and after spinning, cooling the wire rod by air, controlling the phase change temperature of the wire rod to be 600-650 ℃, and controlling the phase change time to be 12-18 s.
CN201910822071.2A 2019-09-02 2019-09-02 Low-cost cord steel wire rod and production method thereof Active CN110453153B (en)

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CN111647811A (en) * 2020-05-29 2020-09-11 鞍钢股份有限公司 Welding wire steel wire rod suitable for pickling-free shelling process and production method
CN111979476B (en) * 2020-06-05 2022-05-13 鞍钢股份有限公司 Wire for automobile control line and manufacturing method thereof
CN112048659B (en) * 2020-09-11 2021-08-10 上海大学 High-strength high-ductility steel plate and preparation method thereof
CN114959505B (en) * 2022-07-12 2023-05-12 鞍钢股份有限公司 High-carbon steel wire rod with high drawing stranding performance and production method thereof
CN115161558B (en) * 2022-07-12 2024-04-16 鞍钢股份有限公司 Wire rod for ultra-high strength steel wire cord, steel wire, cord and manufacturing method

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CN102953005B (en) * 2011-08-19 2015-07-08 鞍钢股份有限公司 High-carbon and low-alloy steel wire rod for producing fine steel wires, and its manufacturing method
CN105316573B (en) * 2014-06-23 2017-07-21 鞍钢股份有限公司 A kind of 80 grades of Wire Rod Steel for Curtain String Purpose and its production method suitable for Pickling Descaling
CN105506479B (en) * 2014-09-26 2017-09-29 鞍钢股份有限公司 A kind of outer wrapping wire wire rod of 70 grades of cords and its production method
CN105483557A (en) * 2014-09-26 2016-04-13 鞍钢股份有限公司 Steel wire rod for 80 grade core thread external winding wire and manufacturing method of steel wire rod
CN109957711A (en) * 2017-12-14 2019-07-02 鞍钢股份有限公司 A kind of Wire Rod Steel for Curtain String Purpose and production method

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