CN113088798A - High-carbon steel wire rod and production method thereof - Google Patents
High-carbon 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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- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/34—Methods of heating
- C21D1/44—Methods of heating in heat-treatment baths
- C21D1/46—Salt baths
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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
- C21D11/00—Process control or regulation for heat treatments
- C21D11/005—Process control or regulation for heat treatments for cooling
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- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/002—Heat treatment of ferrous alloys containing Cr
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- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
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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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
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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
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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
- 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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- 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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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
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- 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
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
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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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/009—Pearlite
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Abstract
The invention discloses a high-carbon steel wire rod and a production method thereof. The production method comprises the working procedures of molten steel smelting, continuous casting, cogging, high-speed wire rolling, temperature-controlled cooling and salt bath heat treatment which are sequentially carried out; the temperature of the soaking section in the cogging procedure is 1200-1250 ℃, and the soaking time is more than or equal to 6 h; the temperature-controlled cooling procedure is to carry out temperature-controlled cooling on the wire rod on a stelmor cooling line; in the salt bath heat treatment process, the wire rod cooled by temperature control is paid off and then heated, the heating temperature is 920-980 ℃, and then the wire rod is sent to a salt bath tank for isothermal phase change, wherein the cooling rate before isothermal phase change is more than or equal to 30 ℃/s. The chemical components of the prepared high-carbon steel wire rod comprise the following components in percentage by mass: 0.001-0.050% of Al, 0.01-0.09% of V, 0.01-0.05% of Nb and 0.01-0.05% of Ti, 0.85-1.05% of C, 0.25-1.20% of Si, 0.30-0.90% of Mn, 0.25-0.40% of Cr, and the balance of Fe and inevitable impurity elements; and the strength is high, the plasticity and the toughness are good, and the uniformity of the same-circle mechanical property is good.
Description
Technical Field
The invention belongs to the technical field of steel smelting, and relates to a production method of a high-carbon steel wire rod, and the high-carbon steel wire rod prepared by the production method.
Background
Poor uniformity of steel easily causes uneven stress of the steel product in the service process, and influences the use safety of the steel product. Especially, the uniformity of the same-circle mechanical property of the wire rod is poor, the wire breakage rate of a downstream user in the drawing process can be directly high, and the steel wire prepared by drawing is easy to break in the service process. The poor uniformity of the same-circle mechanical properties of the wire rod is mainly shown in the aspects of large range of tensile strength of the same-circle wire rod, large range of surface shrinkage rate of the same-circle wire rod, large range of post-fracture elongation rate of the same-circle wire rod and the like. For example, the tensile strength of the common 82B wire rod is extremely poor and even reaches 120MPa, and the service life of the steel wire and the safety factor in use are seriously influenced.
Therefore, the mechanical property and the same-circle mechanical property uniformity of the wire rod are improved, and the comprehensive scientific design and the full-flow fine control are required.
Disclosure of Invention
In order to solve at least one of the above technical problems, an object of the present invention is to provide a method for producing a high-carbon steel wire rod, and a high-carbon steel wire rod produced by the production method.
In order to achieve one of the above objects, an embodiment of the present invention provides a method for producing a high-carbon steel wire rod, including the following steps performed in sequence:
smelting molten steel: mixing molten iron and scrap steel into molten steel, and smelting;
continuous casting: continuously casting molten steel obtained by smelting the molten steel into a continuous casting blank;
cogging: heating the obtained continuous casting billet by a heating furnace, continuously rolling and cogging to obtain an intermediate billet, wherein the temperature of a soaking section is 1200-1250 ℃, and the soaking time is more than or equal to 6 hours;
high-speed wire rolling: rolling the obtained intermediate blank into a wire rod, wherein the wire rod comprises the following chemical components in percentage by mass: 0.001-0.050% of Al, 0.01-0.09% of V, 0.01-0.05% of Nb and 0.01-0.05% of Ti, 0.85-1.05% of C, 0.25-1.20% of Si, 0.30-0.90% of Mn, 0.25-0.40% of Cr, and the balance of Fe and inevitable impurity elements;
temperature control and cooling: carrying out temperature control cooling on the wire rod on a stelmor cooling line;
salt bath heat treatment: and paying off the wire rod cooled by controlling the temperature, heating at 920-980 ℃, and then sending the wire rod into a salt bath tank for isothermal phase change, wherein the cooling rate before isothermal phase change is more than or equal to 30 ℃/s.
Preferably, the molten steel smelting process comprises molten iron desulphurization, converter smelting and LF refining which are sequentially carried out; wherein the content of the first and second substances,
in the molten iron desulphurization procedure, the S content in the desulfurized molten iron is controlled to be less than 0.005 percent by mass;
in the smelting process of the converter, the tapping temperature is controlled to be 1620-1660 ℃, and the P in the molten steel at the smelting end point is controlled to be less than or equal to 0.012%.
Preferably, in the continuous casting process, the superheat degree of the tundish is controlled to be 18-25 ℃, the blank drawing speed is 0.64 +/-0.02 m/min, and the obtained molten steel is continuously cast into a large square blank with the cross section size of 300 multiplied by 390 mm.
Preferably, in the continuous casting process, the total reduction of the continuous casting slab is 18-24 mm, and the ratio of the carbon content of the central position of the continuous casting slab to the carbon content of molten steel obtained in the molten steel smelting process is controlled to be 0.96-1.05.
Preferably, in the continuous casting process, the continuous casting blank is sent into a heat preservation pit for slow cooling after being sized, the pit entry temperature of the continuous casting blank is more than or equal to 650 ℃, and the pit exit temperature of the continuous casting blank is less than or equal to 200 ℃.
Preferably, in the high-speed wire rolling step, the intermediate billet is heated to 1150-1200 ℃ and is kept warm for 0.5-1 h, and then rolling is started, wherein the initial rolling temperature is 1020-1060 ℃, and the final rolling speed is 22-27 m/s.
Preferably, in the temperature-controlled cooling process, the spinning temperature is 880-900 ℃, the cooling rate before pearlite transformation is 11.5-13.5 ℃/s, the transformation temperature is 580-640 ℃, and the cooling rate during pearlite transformation is 1.5-2.5 ℃/s.
Preferably, in the salt bath heat treatment process, the wiring speed of the salt bath is 2.0-3.0 m/min, the working length of the salt bath is 10m, and the temperature of the salt bath is 520-540 ℃.
Preferably, when the content of C in the wire rod is 0.85-0.90%, the wiring speed of the salt bath is 2.5-3.0 m/min, and the temperature of the salt bath is 530-540 ℃;
when the content of C in the wire rod is 0.90-1.05%, the wiring speed of the salt bath is 2.0-2.5 m/min, and the temperature of the salt bath is 520-530 ℃.
In order to achieve one of the above objects, an embodiment of the present invention further provides a high carbon steel wire rod prepared by the above production method.
Preferably, in the high-carbon steel wire rod, the range of the tensile strength of the wire rod in the same circle is less than or equal to 20MPa, the range of the surface shrinkage rate of the wire rod in the same circle is less than or equal to 6%, and the range of the elongation after fracture of the wire rod in the same circle is less than or equal to 2%.
Compared with the prior art, the invention has the beneficial effects that:
(1) while controlling the content of strengthening elements C, Si, Mn and Cr, selectively adding at least one element of Al, V, Nb and Ti and controlling the content of the elements, so that the wire rod has enough strength and uniform structure, crystal grains can be further refined, reticular cementite can be dispersed, the interlayer spacing of pearlite sheets is reduced, and the drawing performance of the high-carbon steel wire rod is improved; particularly, free N in steel can be fixed by adding Ti, so that age hardening caused by temperature rise in the wire drawing process is avoided; by controlling the upper limit of the content of harmful elements such as S, P in the wire rod, the grain boundary segregation and the formation of inclusions in the wire rod can be reduced, and the corrosion resistance of the wire rod is ensured;
(2) by controlling the superheat degree, the blank drawing speed, the reduction and the like in the continuous casting process, the strength can be improved by ensuring the design of chemical components, the cavity negative pressure generated by solidification shrinkage of the central area of the billet is prevented, the molten steel with intercrystalline enriched solute elements is prevented from flowing to the central area, and the macro segregation is greatly reduced; cracks can be prevented from being generated on the surface and inside of the steel billet through slow cooling, the qualification rate of the continuous casting billet is improved, and the grinding amount of the surface of the billet in the cogging process is reduced;
(3) through the control of the cogging process, the high-speed wire rolling process and the process parameters, the composition uniformity of the steel billet can be further improved, and the micro segregation is reduced, so that the structure uniformity and the same-circle mechanical property uniformity of the wire rod are improved;
(4) by controlling the temperature and cooling speed in the temperature-controlled cooling process and the salt bath heat treatment, the transformation from supercooled austenite to pearlite can be promoted, the pearlite transformation time is shortened, the formation of reticular cementite, low-temperature bainite and martensite is avoided, and the structure uniformity and the same-circle mechanical property uniformity of the wire rod are improved;
(5) the high-carbon steel wire rod has the advantages of high strength, good plasticity and toughness and good uniformity of mechanical properties in the same circle, is suitable for important-purpose metal products with high safety requirements, can avoid aging treatment of downstream users on the wire rod, shortens the flow, saves the time and reduces the inventory pressure.
Detailed Description
The technical solutions of the present invention will be further described with reference to specific embodiments, and the technical contents described below are only exemplary embodiments of the present invention and are not intended to limit the scope of the present invention, which is defined by the appended claims.
The high-carbon steel wire rod prepared by the production method has the advantages of high strength, good plasticity and toughness and good uniformity of mechanical properties in the same circle, and is suitable for important-purpose metal products with high safety requirements. The wire rod comprises the following chemical components in percentage by mass: 0.001-0.050% of Al, 0.01-0.09% of V, 0.01-0.05% of Nb and 0.01-0.05% of Ti, 0.85-1.05% of C, 0.25-1.20% of Si, 0.30-0.90% of Mn, 0.25-0.40% of Cr, and the balance of Fe and inevitable impurity elements.
The production method comprises the following steps of sequentially carrying out:
(1) molten steel smelting process: mixing molten iron and scrap steel into molten steel, and smelting;
preferably, the molten steel smelting process comprises molten iron desulphurization, converter smelting and LF refining which are sequentially carried out to prepare molten steel according with the chemical composition design scheme of the wire rod; in the molten iron desulphurization process, the S content in the desulphurized molten iron is controlled to be less than 0.005 percent in mass percentage; in the smelting process of the converter, the tapping temperature is controlled to be 1620-1660 ℃, and the P in the molten steel at the smelting end point is controlled to be less than or equal to 0.012%.
(2) And (3) continuous casting process: continuously casting molten steel obtained by smelting the molten steel into a continuous casting blank;
preferably, the continuous casting process adopts low superheat degree and constant drawing speed casting, the superheat degree of a tundish is controlled to be 18-25 ℃, the drawing speed is 0.64 +/-0.02 m/min, and the obtained molten steel is continuously cast into a large square billet with the cross section size of 300 multiplied by 390 mm;
preferably, the rolling reduction of the continuous casting billet at each section is distributed by adopting a solidification model, the total rolling reduction of the continuous casting billet is controlled to be 18-24 mm, and the ratio of the carbon content at the center of the continuous casting billet to the carbon content in molten steel obtained in the molten steel smelting process is controlled to be 0.96-1.05;
preferably, the continuous casting billets are sent into a heat preservation pit for slow cooling after being sized, the pit entry temperature of the continuous casting billets is more than or equal to 650 ℃, and the pit exit temperature of the continuous casting billets is less than or equal to 200 ℃.
(3) Cogging: heating the obtained continuous casting billet by a heating furnace, and then continuously rolling and cogging to obtain an intermediate billet, wherein the temperature of a soaking section is 1200-1250 ℃, and the soaking time is more than or equal to 6 hours;
preferably, the heated continuous casting blank is subjected to 9-pass continuous rolling cogging, and the billet is polished according to the surface condition of the intermediate billet after cogging.
(4) High-speed wire rolling procedure: rolling the obtained intermediate blank into a wire rod, wherein the wire rod comprises the following chemical components in percentage by mass: 0.001-0.050% of Al, 0.01-0.09% of V, 0.01-0.05% of Nb and 0.01-0.05% of Ti, 0.85-1.05% of C, 0.25-1.20% of Si, 0.30-0.90% of Mn, 0.25-0.40% of Cr, and the balance of Fe and inevitable impurity elements;
preferably, the intermediate blank is heated to 1150-1200 ℃ and is kept warm for 0.5-1 h, then rolling is started, the initial rolling temperature is 1020-1060 ℃, and the final rolling speed is 22-27 m/s.
(5) Temperature control cooling process: carrying out temperature control cooling on the wire rod on a stelmor cooling line;
preferably, the spinning temperature is 880-900 ℃, the cooling rate before pearlite transformation is 11.5-13.5 ℃/s, the transformation temperature is 580-640 ℃, and the cooling rate during pearlite transformation is 1.5-2.5 ℃/s.
(6) Salt bath heat treatment: paying off the wire rod cooled by controlling the temperature, heating the wire rod to an austenitizing temperature which is 920-980 ℃, and then sending the wire rod into a salt bath for isothermal phase change, wherein the cooling rate before the isothermal phase change is more than or equal to 30 ℃/s;
preferably, the speed of the off-line heat treatment is 2.0-3.0 m/min, the working length of the salt bath is 10m, and the temperature of the salt bath is 520-540 ℃.
Specifically, when the content of C in the wire rod is 0.85-0.90%, the wiring speed of the salt bath is 2.5-3.0 m/min, and the temperature of the salt bath is 530-540 ℃;
when the content of C in the wire rod is 0.90-1.05%, the wiring speed of the salt bath is 2.0-2.5 m/min, and the temperature of the salt bath is 520-530 ℃.
In addition, the invention also provides a high-carbon steel wire rod, which is prepared by adopting the production method of the high-carbon steel wire rod, and the wire rod comprises the following chemical components in percentage by mass: 0.001-0.050% of Al, 0.01-0.09% of V, 0.01-0.05% of Nb and 0.01-0.05% of Ti, 0.85-1.05% of C, 0.25-1.20% of Si, 0.30-0.90% of Mn, 0.25-0.40% of Cr, and the balance of Fe and inevitable impurity elements.
Preferably, the diameter of the high-carbon steel wire rod is 14-16 mm.
Preferably, the range of tensile strength of the same circle of wire rod of the high-carbon steel wire rod is less than or equal to 20MPa, the range of surface shrinkage of the same circle of wire rod is less than or equal to 6%, and the range of post-fracture elongation of the same circle of wire rod is less than or equal to 2%, so that the high-carbon steel wire rod has the advantages of high strength, good plasticity and toughness and good uniformity of mechanical properties of the same circle, is suitable for important-purpose metal products with high safety requirements, can avoid aging treatment of downstream users on the wire rod, shorten the flow, save the time and reduce the inventory pressure.
As described above, the method for producing a high-carbon steel wire rod and the high-carbon steel wire rod according to the present invention are obtained in accordance with a large number of experimental studies, and the present embodiment is further described below with reference to examples 1 to 8 of an embodiment of the present invention. It is clear that the embodiments 1 to 8 described are some, but not all embodiments of the present invention.
Specifically, examples 1 to 8 each provide a wire rod, each of which has a chemical composition in mass percent as shown in table 1.
[ Table 1]
The following describes the manufacturing method of each embodiment in detail.
Example 1
(1) Molten iron desulphurization: and (3) adopting a KR desulfurization technology, adding a desulfurizing agent to remove sulfur in the molten iron, and controlling the S content in the desulfurized molten iron to be 0.0035 percent in percentage by mass.
(2) Smelting in a converter: and transferring the desulfurized molten iron obtained in the molten iron desulfurization procedure into a converter, adding high-quality scrap steel for oxygen blowing smelting, controlling the tapping temperature to be 1620 ℃, and controlling the P in the molten steel at the smelting end point to be 0.009 percent by mass.
(3) LF refining: and transferring the molten steel smelted by the converter into an LF furnace for refining, and regulating and controlling chemical components in the molten steel to prepare the molten steel according with the design scheme of the chemical components of the wire rod.
(4) And (3) continuous casting process: controlling the superheat degree of the tundish to be 21 ℃ and the blank drawing speed to be 0.63m/min, and continuously casting the obtained molten steel into a large square blank with the cross section size of 300 multiplied by 390 mm; distributing the reduction of the continuous casting billet at each section by adopting a solidification model, controlling the total reduction of the continuous casting billet to be 21mm, and controlling the ratio of the carbon content at the center of the continuous casting billet to the carbon content in molten steel obtained in a molten steel smelting process to be 0.96-1.05; and (3) after sizing, sending the continuous casting slab into a heat preservation pit for slow cooling, wherein the pit entry temperature of the continuous casting slab is 708 ℃, and the pit exit temperature of the continuous casting slab is 192 ℃.
(5) Cogging: heating the obtained continuous casting billet by a heating furnace, and then carrying out 9-pass continuous rolling cogging to obtain an intermediate billet, wherein the temperature of a soaking section is 1225 +/-10 ℃, and the soaking time is 7.5 hours; and grinding according to the surface condition of the intermediate blank after cogging.
(6) High-speed wire rolling procedure: heating the intermediate blank to 1180 +/-10 ℃, preserving heat for 1h, and then starting to roll the intermediate blank into a wire rod with the diameter of 16mm, wherein the initial rolling temperature is 1030 ℃ and the final rolling speed is 23 m/s.
(7) Temperature control cooling process: and (3) carrying out temperature-controlled cooling on the wire rod on a stelmor cooling line, wherein the spinning temperature is 889 ℃, the cooling speed before pearlite phase transformation is 12.8 ℃/s, the phase transformation temperature is 620-640 ℃, and the cooling speed during pearlite phase transformation is 1.7 ℃/s.
(8) Salt bath heat treatment: paying off the wire rod cooled by controlling the temperature, heating to the austenitizing temperature at 930 ℃, and then conveying to a salt bath with the working length of 10m for isothermal phase change, wherein the temperature of the salt bath is 532 ℃, the wiring speed of the salt bath is 2.6m/min, and the cooling rate before isothermal phase change is 34.6 ℃/s.
And (3) cutting the cross section of the wire rod, and detecting according to YB-T169-2018 metallographic detection method of sorbite content of the high-carbon steel wire rod to obtain that the sorbite proportion in the wire rod is 92 percent and no reticular carbide and martensite structures exist.
In addition, a whole circle of unaged wire rod was taken, 10 wire rods were continuously cut from the circle of wire rod and subjected to mechanical property detection, and the measured tensile strength range, extremely poor tensile strength, extremely poor surface shrinkage range, extremely poor surface shrinkage, elongation after fracture and extremely poor elongation after fracture of the 10 wire rods were as shown in table 2.
Example 2
(1) Molten iron desulphurization: and (3) adopting a KR desulfurization technology, adding a desulfurizer to remove sulfur in the molten iron, and controlling the S content in the desulfurized molten iron to be 0.004 percent in mass percentage.
(2) Smelting in a converter: transferring the desulfurized molten iron obtained in the molten iron desulfurization procedure into a converter, adding high-quality scrap steel for oxygen blowing smelting, controlling the tapping temperature to be 1641 ℃, and controlling the P in the molten steel at the smelting end point to be 0.01 percent by mass.
(3) LF refining: and transferring the molten steel smelted by the converter into an LF furnace for refining, and regulating and controlling chemical components in the molten steel to prepare the molten steel according with the design scheme of the chemical components of the wire rod.
(4) And (3) continuous casting process: controlling the superheat degree of the tundish at 25 ℃ and the blank drawing speed at 0.64m/min, and continuously casting the obtained molten steel into a large square blank with the cross section size of 300 multiplied by 390 mm; distributing the reduction of the continuous casting billet at each section by adopting a solidification model, controlling the total reduction of the continuous casting billet to be 18mm, and controlling the ratio of the carbon content at the center of the continuous casting billet to the carbon content in molten steel obtained in a molten steel smelting process to be 0.96-1.05; after sizing, the continuous casting blank is sent into a heat preservation pit for slow cooling, the pit entry temperature of the continuous casting blank is 688 ℃, and the pit exit temperature of the continuous casting blank is 193 ℃.
(5) Cogging: heating the obtained continuous casting billet by a heating furnace, and then carrying out 9-pass continuous rolling cogging to obtain an intermediate billet, wherein the temperature of a soaking section is 1210 +/-10 ℃, and the soaking time is 8 hours; and grinding according to the surface condition of the intermediate blank after cogging.
(6) High-speed wire rolling procedure: heating the intermediate blank to 1170 +/-10 ℃, preserving heat for 0.7h, and then starting to roll the intermediate blank into a wire rod with the diameter of 14mm, wherein the initial rolling temperature is 1045 ℃, and the final rolling speed is 27 m/s.
(7) Temperature control cooling process: and (3) carrying out temperature-controlled cooling on the wire rod on a stelmor cooling line, wherein the spinning temperature is 882 ℃, the cooling speed before pearlite phase transformation is 13.5 ℃/s, the phase transformation temperature is 620-640 ℃, and the cooling speed during pearlite phase transformation is 2.5 ℃/s.
(8) Salt bath heat treatment: paying off the wire rod cooled by controlling the temperature, heating to austenitizing temperature at 920 ℃, and then sending the wire rod into a salt bath with the working length of 10m for isothermal phase change, wherein the temperature of the salt bath is 540 ℃, the wiring speed of the salt bath is 3.0m/min, and the cooling rate before the isothermal phase change is 38.4 ℃/s.
And (3) cutting the cross section of the wire rod, and detecting according to YB-T169-2018 metallographic detection method of sorbite content of the high-carbon steel wire rod to obtain that the sorbite proportion in the wire rod is 93 percent and no reticular carbide and martensite structures exist.
In addition, a whole circle of unaged wire rod was taken, 10 wire rods were continuously cut from the circle of wire rod and subjected to mechanical property detection, and the measured tensile strength range, extremely poor tensile strength, extremely poor surface shrinkage range, extremely poor surface shrinkage, elongation after fracture and extremely poor elongation after fracture of the 10 wire rods were as shown in table 2.
Example 3
(1) Molten iron desulphurization: and (3) adopting a KR desulfurization technology, adding a desulfurizing agent to remove sulfur in the molten iron, and controlling the S content in the desulfurized molten iron to be 0.005 percent in percentage by mass.
(2) Smelting in a converter: and transferring the desulfurized molten iron obtained in the molten iron desulfurization procedure into a converter, adding high-quality scrap steel for oxygen blowing smelting, controlling the tapping temperature to be 1656 ℃, and controlling the P in the molten steel at the smelting end point to be 0.009% in percentage by mass.
(3) LF refining: and transferring the molten steel smelted by the converter into an LF furnace for refining, and regulating and controlling chemical components in the molten steel to prepare the molten steel according with the design scheme of the chemical components of the wire rod.
(4) And (3) continuous casting process: controlling the superheat degree of the tundish at 20 ℃ and the blank drawing speed at 0.62m/min, and continuously casting the obtained molten steel into a large square blank with the cross section size of 300 multiplied by 390 mm; distributing the reduction of the continuous casting billet at each section by adopting a solidification model, controlling the total reduction of the continuous casting billet to be 23mm, and controlling the ratio of the carbon content at the center of the continuous casting billet to the carbon content in molten steel obtained in a molten steel smelting process to be 0.96-1.05; and (3) after sizing, sending the continuous casting slab into a heat preservation pit for slow cooling, wherein the pit entry temperature of the continuous casting slab is 692 ℃, and the pit exit temperature of the continuous casting slab is 176 ℃.
(5) Cogging: heating the obtained continuous casting billet by a heating furnace, and then carrying out 9-pass continuous rolling cogging to obtain an intermediate billet, wherein the temperature of a soaking section is 1230 +/-10 ℃, and the soaking time is 7.5 hours; and grinding according to the surface condition of the intermediate blank after cogging.
(6) High-speed wire rolling procedure: heating the intermediate blank to 1170 +/-10 ℃, preserving heat for 0.8h, and then starting to roll the intermediate blank into a wire rod with the diameter of 14mm, wherein the initial rolling temperature is 1040 ℃, and the final rolling speed is 26 m/s.
(7) Temperature control cooling process: and (3) carrying out temperature-controlled cooling on the wire rod on a stelmor cooling line, wherein the spinning temperature is 897 ℃, the cooling speed before pearlite phase transformation is 12.7 ℃/s, the phase transformation temperature is 600-620 ℃, and the cooling speed during pearlite phase transformation is 2.2 ℃/s.
(8) Salt bath heat treatment: paying off the wire rod cooled by controlling the temperature, heating to austenitizing temperature at 938 ℃, and then conveying to a salt bath with the working length of 10m for isothermal phase change, wherein the temperature of the salt bath is 530 ℃, the wiring speed of the salt bath is 2.5m/min, and the cooling rate before isothermal phase change is 35.4 ℃/s.
And (3) cutting the cross section of the wire rod, and detecting according to YB-T169-2018 metallographic detection method of sorbite content of the high-carbon steel wire rod, so as to obtain that the sorbite proportion in the wire rod is 95 percent, and no reticular carbide and martensite structures exist.
In addition, a whole circle of unaged wire rod was taken, 10 wire rods were continuously cut from the circle of wire rod and subjected to mechanical property detection, and the measured tensile strength range, extremely poor tensile strength, extremely poor surface shrinkage range, extremely poor surface shrinkage, elongation after fracture and extremely poor elongation after fracture of the 10 wire rods were as shown in table 2.
Example 4
(1) Molten iron desulphurization: and (3) adopting a KR desulfurization technology, adding a desulfurizer to remove sulfur in the molten iron, and controlling the S content in the desulfurized molten iron to be 0.004 percent in mass percentage.
(2) Smelting in a converter: transferring the desulfurized molten iron obtained in the molten iron desulfurization procedure into a converter, adding high-quality scrap steel for oxygen blowing smelting, controlling the tapping temperature to be 1647 ℃, and controlling the P in the molten steel at the smelting end point to be 0.010 percent by mass.
(3) LF refining: and transferring the molten steel smelted by the converter into an LF furnace for refining, and regulating and controlling chemical components in the molten steel to prepare the molten steel according with the design scheme of the chemical components of the wire rod.
(4) And (3) continuous casting process: controlling the superheat degree of the tundish at 18 ℃ and the blank drawing speed at 0.62m/min, and continuously casting the obtained molten steel into a large square blank with the cross section size of 300 multiplied by 390 mm; distributing the reduction of the continuous casting billet at each section by adopting a solidification model, controlling the total reduction of the continuous casting billet to be 23mm, and controlling the ratio of the carbon content at the center of the continuous casting billet to the carbon content in molten steel obtained in a molten steel smelting process to be 0.96-1.05; after sizing, the continuous casting slab is sent into a heat preservation pit for slow cooling, the pit entry temperature of the continuous casting slab is 752 ℃, and the pit exit temperature is 186 ℃.
(5) Cogging: heating the obtained continuous casting billet by a heating furnace, and then carrying out 9-pass continuous rolling cogging to obtain an intermediate billet, wherein the temperature of a soaking section is 1235 +/-10 ℃, and the soaking time is 7 hours; and grinding according to the surface condition of the intermediate blank after cogging.
(6) High-speed wire rolling procedure: heating the intermediate blank to 1160 +/-10 ℃, preserving heat for 1h, and then starting to roll the intermediate blank into a wire rod with the diameter of 14mm, wherein the initial rolling temperature is 1020 ℃ and the final rolling speed is 27 m/s.
(7) Temperature control cooling process: and (3) carrying out temperature-controlled cooling on the wire rod on a stelmor cooling line, wherein the spinning temperature is 893 ℃, the cooling speed before pearlite phase transformation is 12.9 ℃/s, the phase transformation temperature is 600-620 ℃, and the cooling speed during pearlite phase transformation is 2.0 ℃/s.
(8) Salt bath heat treatment: paying off the wire rod cooled by controlling the temperature, heating to austenitizing temperature at 960 ℃, and then sending to a salt bath with the working length of 10m for isothermal phase change, wherein the temperature of the salt bath is 527 ℃, the wiring speed of the salt bath is 2.4m/min, and the cooling rate before isothermal phase change is 34.6 ℃/s.
And (3) cutting the cross section of the wire rod, and detecting according to YB-T169-2018 metallographic detection method of sorbite content of the high-carbon steel wire rod to obtain that the sorbite proportion in the wire rod is 92 percent and no reticular carbide and martensite structures exist.
In addition, a whole circle of unaged wire rod was taken, 10 wire rods were continuously cut from the circle of wire rod and subjected to mechanical property detection, and the measured tensile strength range, extremely poor tensile strength, extremely poor surface shrinkage range, extremely poor surface shrinkage, elongation after fracture and extremely poor elongation after fracture of the 10 wire rods were as shown in table 2.
Example 5
(1) Molten iron desulphurization: and (3) adopting a KR desulfurization technology, adding a desulfurizing agent to remove sulfur in the molten iron, and controlling the S content in the desulfurized molten iron to be 0.0045 percent in percentage by mass.
(2) Smelting in a converter: and transferring the desulfurized molten iron obtained in the molten iron desulfurization procedure into a converter, adding high-quality scrap steel for oxygen blowing smelting, controlling the tapping temperature to be 1660 ℃, and controlling the P in the molten steel at the smelting end point to be 0.008% by mass.
(3) LF refining: and transferring the molten steel smelted by the converter into an LF furnace for refining, and regulating and controlling chemical components in the molten steel to prepare the molten steel according with the design scheme of the chemical components of the wire rod.
(4) And (3) continuous casting process: controlling the superheat degree of the tundish to be 19 ℃ and the blank drawing speed to be 0.62m/min, and continuously casting the obtained molten steel into a large square blank with the cross section size of 300 multiplied by 390 mm; distributing the reduction of the continuous casting billet at each section by adopting a solidification model, controlling the total reduction of the continuous casting billet to be 22mm, and controlling the ratio of the carbon content at the center of the continuous casting billet to the carbon content in molten steel obtained in a molten steel smelting process to be 0.96-1.05; after sizing, the continuous casting billet is sent into a heat preservation pit for slow cooling, the pit entry temperature of the continuous casting billet is 751 ℃, and the pit exit temperature of the continuous casting billet is 183 ℃.
(5) Cogging: heating the obtained continuous casting billet by a heating furnace, and then carrying out 9-pass continuous rolling cogging to obtain an intermediate billet, wherein the temperature of a soaking section is 1215 +/-100 ℃, and the soaking time is 6.5 h; and grinding according to the surface condition of the intermediate blank after cogging.
(6) High-speed wire rolling procedure: heating the intermediate blank to 1165 +/-10 ℃, preserving heat for 0.5h, and then starting to roll the intermediate blank into a wire rod with the diameter of 15mm, wherein the starting rolling temperature is 1030 ℃, and the final rolling speed is 25 m/s.
(7) Temperature control cooling process: and (3) carrying out temperature-controlled cooling on the wire rod on a stelmor cooling line, wherein the spinning temperature is 880 ℃, the cooling speed before pearlite phase transformation is 12.9 ℃/s, the phase transformation temperature is 620-640 ℃, and the cooling speed during pearlite phase transformation is 2.3 ℃/s.
(8) Salt bath heat treatment: paying off the wire rod cooled by controlling the temperature, heating to an austenitizing temperature at 933 ℃, then sending the wire rod to a salt bath with the working length of 10m for isothermal phase change, wherein the temperature of the salt bath is 535 ℃, the wiring speed of the salt bath is 2.8m/min, and the cooling rate before the isothermal phase change is 37.1 ℃/s.
And (3) cutting the cross section of the wire rod, and detecting according to YB-T169-2018 metallographic detection method of sorbite content of the high-carbon steel wire rod to obtain that the sorbite proportion in the wire rod is 92 percent and no reticular carbide and martensite structures exist.
In addition, a whole circle of unaged wire rod was taken, 10 wire rods were continuously cut from the circle of wire rod and subjected to mechanical property detection, and the measured tensile strength range, extremely poor tensile strength, extremely poor surface shrinkage range, extremely poor surface shrinkage, elongation after fracture and extremely poor elongation after fracture of the 10 wire rods were as shown in table 2.
Example 6
(1) Molten iron desulphurization: and (3) adopting a KR desulfurization technology, adding a desulfurizer to remove sulfur in the molten iron, and controlling the S content in the desulfurized molten iron to be 0.004 percent in mass percentage.
(2) Smelting in a converter: and transferring the desulfurized molten iron obtained in the molten iron desulfurization procedure into a converter, adding high-quality scrap steel for oxygen blowing smelting, controlling the tapping temperature to be 1643 ℃, and controlling the P in the molten steel at the smelting end point to be 0.007 percent in percentage by mass.
(3) LF refining: and transferring the molten steel smelted by the converter into an LF furnace for refining, and regulating and controlling chemical components in the molten steel to prepare the molten steel according with the design scheme of the chemical components of the wire rod.
(4) And (3) continuous casting process: controlling the superheat degree of the tundish to be 19 ℃ and the blank drawing speed to be 0.66m/min, and continuously casting the obtained molten steel into a large square blank with the cross section size of 300 multiplied by 390 mm; distributing the reduction of the continuous casting billet at each section by adopting a solidification model, controlling the total reduction of the continuous casting billet to be 24mm, and controlling the ratio of the carbon content at the center of the continuous casting billet to the carbon content in molten steel obtained in a molten steel smelting process to be 0.96-1.05; after sizing, the continuous casting slab is sent into a heat preservation pit for slow cooling, the pit entry temperature of the continuous casting slab is 750 ℃, and the pit exit temperature of the continuous casting slab is 168 ℃.
(5) Cogging: heating the obtained continuous casting billet by a heating furnace, and then carrying out 9-pass continuous rolling cogging to obtain an intermediate billet, wherein the temperature of a soaking section is 1240 +/-10 ℃, and the soaking time is 6.5 hours; and grinding according to the surface condition of the intermediate blank after cogging.
(6) High-speed wire rolling procedure: heating the intermediate blank to 1175 +/-10 ℃, keeping the temperature for 0.6h, and then starting to roll the intermediate blank into a wire rod with the diameter of 16mm, wherein the initial rolling temperature is 1052 ℃, and the final rolling speed is 22 m/s.
(7) Temperature control cooling process: and (3) carrying out temperature-controlled cooling on the wire rod on a stelmor cooling line, wherein the spinning temperature is 900 ℃, the cooling speed before pearlite phase transformation is 11.5 ℃/s, the phase transformation temperature is 580-600 ℃, and the cooling speed during pearlite phase transformation is 1.5 ℃/s.
(8) Salt bath heat treatment: paying off the wire rod cooled by controlling the temperature, heating to austenitizing temperature at 980 ℃, and then sending the wire rod into a salt bath with the working length of 10m for isothermal phase change, wherein the temperature of the salt bath is 520 ℃, the wiring speed of the salt bath is 2.0m/min, and the cooling rate before isothermal phase change is 30 ℃/s.
And (3) cutting the cross section of the wire rod, and detecting according to YB-T169-2018 metallographic detection method of sorbite content of the high-carbon steel wire rod, so as to obtain that the sorbite proportion in the wire rod is 95 percent, and no reticular carbide and martensite structures exist.
In addition, a whole circle of unaged wire rod was taken, 10 wire rods were continuously cut from the circle of wire rod and subjected to mechanical property detection, and the measured tensile strength range, extremely poor tensile strength, extremely poor surface shrinkage range, extremely poor surface shrinkage, elongation after fracture and extremely poor elongation after fracture of the 10 wire rods were as shown in table 2.
Example 7
(1) Molten iron desulphurization: and (3) adopting a KR desulfurization technology, adding a desulfurizing agent to remove sulfur in the molten iron, and controlling the S content in the desulfurized molten iron to be 0.005 percent in percentage by mass.
(2) Smelting in a converter: transferring the desulfurized molten iron obtained in the molten iron desulfurization procedure into a converter, adding high-quality scrap steel for oxygen blowing smelting, controlling the tapping temperature to be 1651 ℃, and controlling the P in the molten steel at the smelting end point to be 0.012 percent by mass.
(3) LF refining: and transferring the molten steel smelted by the converter into an LF furnace for refining, and regulating and controlling chemical components in the molten steel to prepare the molten steel according with the design scheme of the chemical components of the wire rod.
(4) And (3) continuous casting process: controlling the superheat degree of the tundish to be 21 ℃ and the blank drawing speed to be 0.63m/min, and continuously casting the obtained molten steel into a large square blank with the cross section size of 300 multiplied by 390 mm; distributing the reduction of the continuous casting billet at each section by adopting a solidification model, controlling the total reduction of the continuous casting billet to be 22mm, and controlling the ratio of the carbon content at the center of the continuous casting billet to the carbon content in molten steel obtained in a molten steel smelting process to be 0.96-1.05; after sizing, the continuous casting slab is sent into a heat preservation pit for slow cooling, the pit entry temperature of the continuous casting slab is 650 ℃, and the pit exit temperature of the continuous casting slab is 190 ℃.
(5) Cogging: heating the obtained continuous casting billet by a heating furnace, and then carrying out 9-pass continuous rolling cogging to obtain an intermediate billet, wherein the temperature of a soaking section is 1235 +/-10 ℃, and the soaking time is 7 hours; and grinding according to the surface condition of the intermediate blank after cogging.
(6) High-speed wire rolling procedure: heating the intermediate blank to 1190 +/-10 ℃, preserving heat for 1h, and then starting to roll the intermediate blank into a wire rod with the diameter of 14mm, wherein the initial rolling temperature is 1060 ℃, and the final rolling speed is 26 m/s.
(7) Temperature control cooling process: and (3) carrying out temperature-controlled cooling on the wire rod on a stelmor cooling line, wherein the spinning temperature is 895 ℃, the cooling speed before pearlite phase transformation is 12.4 ℃/s, the phase transformation temperature is 580-600 ℃, and the cooling speed during pearlite phase transformation is 1.9 ℃/s.
(8) Salt bath heat treatment: paying off the wire rod cooled by controlling the temperature, then carrying out off-line heat treatment at 968 ℃, then sending the wire rod into a salt bath with the working length of 10m for isothermal phase change, wherein the temperature of the salt bath is 528 ℃, the wiring speed of the salt bath is 2.5m/min, and the cooling rate before isothermal phase change is not less than 36.7 ℃/s.
And (3) cutting the cross section of the wire rod, and detecting according to YB-T169-2018 metallographic detection method of sorbite content of the high-carbon steel wire rod, so as to obtain that the sorbite proportion in the wire rod is 97%, and no reticular carbide and martensite structures are generated.
In addition, a whole circle of unaged wire rod was taken, 10 wire rods were continuously cut from the circle of wire rod and subjected to mechanical property detection, and the measured tensile strength range, extremely poor tensile strength, extremely poor surface shrinkage range, extremely poor surface shrinkage, elongation after fracture and extremely poor elongation after fracture of the 10 wire rods were as shown in table 2.
Example 8
(1) Molten iron desulphurization: and (3) adopting a KR desulfurization technology, adding a desulfurizing agent to remove sulfur in the molten iron, and controlling the S content in the desulfurized molten iron to be 0.0042 percent in percentage by mass.
(2) Smelting in a converter: transferring the desulfurized molten iron obtained in the molten iron desulfurization procedure into a converter, adding high-quality scrap steel for oxygen blowing smelting, controlling the tapping temperature to be 1653 ℃, and controlling the P in the molten steel at the smelting end point to be 0.011 percent by mass.
(3) LF refining: and transferring the molten steel smelted by the converter into an LF furnace for refining, and regulating and controlling chemical components in the molten steel to prepare the molten steel according with the design scheme of the chemical components of the wire rod.
(4) And (3) continuous casting process: controlling the superheat degree of the tundish at 18 ℃ and the blank drawing speed at 0.62m/min, and continuously casting the obtained molten steel into a large square blank with the cross section size of 300 multiplied by 390 mm; distributing the reduction of the continuous casting billet at each section by adopting a solidification model, controlling the total reduction of the continuous casting billet to be 24mm, and controlling the ratio of the carbon content at the center of the continuous casting billet to the carbon content in molten steel obtained in a molten steel smelting process to be 0.96-1.05; after sizing, the continuous casting billet is sent into a heat preservation pit for slow cooling, the pit entry temperature of the continuous casting billet is 784 ℃, and the pit exit temperature of the continuous casting billet is 200 ℃.
(5) Cogging: heating the obtained continuous casting billet by a heating furnace, and then carrying out 9-pass continuous rolling cogging to obtain an intermediate billet, wherein the temperature of a soaking section is 1230 +/-10 ℃, and the soaking time is 6 hours; and grinding according to the surface condition of the intermediate blank after cogging.
(6) High-speed wire rolling procedure: heating the intermediate blank to 1180 +/-10 ℃, preserving heat for 0.7h, and then beginning to roll the intermediate blank into a wire rod with the diameter of 15mm, wherein the initial rolling temperature is 1049 ℃, and the final rolling speed is 24 m/s.
(7) Temperature control cooling process: and (3) carrying out temperature-controlled cooling on the wire rod on a stelmor cooling line, wherein the spinning temperature is 898 ℃, the cooling speed before pearlite phase transformation is 11.9 ℃/s, the phase transformation temperature is 580-600 ℃, and the cooling speed during pearlite phase transformation is 1.7 ℃/s.
(8) Salt bath heat treatment: paying off the wire rod cooled by controlling the temperature, heating to an austenitizing temperature at 973 ℃, and then conveying to a salt bath with the working length of 10m for isothermal phase change, wherein the temperature of the salt bath is 525 ℃, the wiring speed of the salt bath is 2.3m/min, and the cooling rate before isothermal phase change is 34.3 ℃/s.
And (3) cutting the cross section of the wire rod, and detecting according to YB-T169-2018 metallographic detection method of sorbite content of the high-carbon steel wire rod to obtain that the sorbite proportion in the wire rod is 96 percent and no reticular carbide and martensite structures exist.
In addition, a whole circle of unaged wire rod was taken, 10 wire rods were continuously cut from the circle of wire rod and subjected to mechanical property detection, and the measured tensile strength range, extremely poor tensile strength, extremely poor surface shrinkage range, extremely poor surface shrinkage, elongation after fracture and extremely poor elongation after fracture of the 10 wire rods were as shown in table 2.
[ Table 2]
Claims (11)
1. The production method of the high-carbon steel wire rod is characterized by comprising the following steps in sequence:
smelting molten steel: mixing molten iron and scrap steel into molten steel, and smelting;
continuous casting: continuously casting molten steel obtained by smelting the molten steel into a continuous casting blank;
cogging: heating the obtained continuous casting billet by a heating furnace, continuously rolling and cogging to obtain an intermediate billet, wherein the temperature of a soaking section is 1200-1250 ℃, and the soaking time is more than or equal to 6 hours;
high-speed wire rolling: rolling the obtained intermediate blank into a wire rod, wherein the wire rod comprises the following chemical components in percentage by mass: 0.001-0.050% of Al, 0.01-0.09% of V, 0.01-0.05% of Nb and 0.01-0.05% of Ti, 0.85-1.05% of C, 0.25-1.20% of Si, 0.30-0.90% of Mn, 0.25-0.40% of Cr, and the balance of Fe and inevitable impurity elements;
temperature control and cooling: carrying out temperature control cooling on the wire rod on a stelmor cooling line;
salt bath heat treatment: and paying off the wire rod cooled by controlling the temperature, heating at 920-980 ℃, and then sending the wire rod into a salt bath tank for isothermal phase change, wherein the cooling rate before isothermal phase change is more than or equal to 30 ℃/s.
2. The method for producing a high-carbon steel wire rod according to claim 1, wherein the molten steel smelting process comprises molten iron desulfurization, converter smelting and LF refining which are performed in sequence; wherein the content of the first and second substances,
in the molten iron desulphurization procedure, the S content in the desulfurized molten iron is controlled to be less than 0.005 percent by mass;
in the smelting process of the converter, the tapping temperature is controlled to be 1620-1660 ℃, and the P in the molten steel at the smelting end point is controlled to be less than or equal to 0.012%.
3. A method for producing a high-carbon steel wire rod according to claim 1, wherein in the continuous casting process, the superheat degree of the tundish is controlled to be 18 to 25 ℃, the blank drawing speed is 0.64 ± 0.02m/min, and the obtained molten steel is continuously cast into a bloom with a cross-sectional dimension of 300 x 390 mm.
4. A production method of a high-carbon steel wire rod according to claim 1, wherein in the continuous casting process, the total reduction amount of the continuous casting slab is 18-24 mm, and the ratio of the carbon content in the central position of the continuous casting slab to the carbon content in molten steel obtained in the molten steel smelting process is controlled to be 0.96-1.05.
5. The production method of the high-carbon steel wire rod according to claim 1, wherein in the continuous casting process, the continuous casting billet is sent into a heat preservation pit for slow cooling after being sized, and the pit entry temperature of the continuous casting billet is more than or equal to 650 ℃ and the pit exit temperature of the continuous casting billet is less than or equal to 200 ℃.
6. The production method of a high-carbon steel wire rod according to claim 1, wherein in the high-speed wire rolling step, the intermediate billet is heated to 1150-1200 ℃ and kept warm for 0.5-1 h, and then rolling is started, wherein the initial rolling temperature is 1020-1060 ℃, and the final rolling speed is 22-27 m/s.
7. A production method of a high-carbon steel wire rod according to claim 1, wherein in the temperature-controlled cooling step, the spinning temperature is 880 to 900 ℃, the cooling rate before pearlite transformation is 11.5 to 13.5 ℃/s, the transformation temperature is 580 to 640 ℃, and the cooling rate during pearlite transformation is 1.5 to 2.5 ℃/s.
8. A production method of a high-carbon steel wire rod according to claim 1, wherein in the salt bath heat treatment process, the wire running speed of a salt bath is 2.0-3.0 m/min, the working length of the salt bath is 10m, and the temperature of the salt bath is 520-540 ℃.
9. The production method of the high-carbon steel wire rod according to claim 8, wherein when the content of C in the wire rod is 0.85-0.90%, the wire running speed of the salt bath is 2.5-3.0 m/min, and the temperature of the salt bath is 530-540 ℃;
when the content of C in the wire rod is 0.90-1.05%, the wiring speed of the salt bath is 2.0-2.5 m/min, and the temperature of the salt bath is 520-530 ℃.
10. A high-carbon steel wire rod characterized by being produced by the production method as set forth in any one of claims 1 to 9.
11. The high-carbon steel wire rod according to claim 10, wherein the high-carbon steel wire rod has a range of tensile strength of 20MPa or less in the same circle, a range of surface shrinkage of 6% or less in the same circle, and a range of post-fracture elongation of 2% or less in the same circle.
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| CN116657062A (en) * | 2023-07-31 | 2023-08-29 | 江苏省沙钢钢铁研究院有限公司 | Wire rod for deep drawing and preparation method thereof |
Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05214443A (en) * | 1992-02-05 | 1993-08-24 | Sumitomo Metal Ind Ltd | Production of high carbon steel wire rod for wiredrawing |
| JPH11256274A (en) * | 1998-03-11 | 1999-09-21 | Nippon Steel Corp | High strength ultra fine steel wire excellent in fatigue characteristic |
| KR20070068513A (en) * | 2005-12-27 | 2007-07-02 | 주식회사 포스코 | A wire rod for steel cord, and method for manufacturing the same |
| JP2007185692A (en) * | 2006-01-13 | 2007-07-26 | Kobe Steel Ltd | High carbon steel wire having excellent wire drawability and its production method |
| CN101649416A (en) * | 2009-09-04 | 2010-02-17 | 江苏省沙钢钢铁研究院有限公司 | High carbon steel wire rod and preparation method thereof |
| CN105671443A (en) * | 2016-02-25 | 2016-06-15 | 邢台钢铁有限责任公司 | Hot-rolled wire rod for 1,960MPa-level cable rope galvanized steel wire and production method |
| CN107299280A (en) * | 2017-08-22 | 2017-10-27 | 青岛特殊钢铁有限公司 | 2000MPa grades of cable steel wires heat treatment wire rod and production method |
| CN108138285A (en) * | 2015-10-23 | 2018-06-08 | 新日铁住金株式会社 | Wire Drawing steel wire material |
| CN110238230A (en) * | 2019-04-28 | 2019-09-17 | 江苏省沙钢钢铁研究院有限公司 | A kind of production method of superhigh intensity diamond wire wire rod |
| CN110669981A (en) * | 2019-10-02 | 2020-01-10 | 江苏省沙钢钢铁研究院有限公司 | Vanadium-boron composite microalloyed cord steel wire rod and production method thereof |
| CN111321352A (en) * | 2020-03-25 | 2020-06-23 | 中国铁道科学研究院集团有限公司 | Strength 2400 MPa-grade prestressed steel strand and production process thereof |
| CN112176258A (en) * | 2020-09-30 | 2021-01-05 | 江苏省沙钢钢铁研究院有限公司 | Wire rod for 2500 MPa-grade steel strand and manufacturing method thereof |
| CN112391584A (en) * | 2020-11-26 | 2021-02-23 | 青岛特殊钢铁有限公司 | Heat treatment wire rod for 2060MPa bridge cable steel wire and production method thereof |
| 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 |
-
2021
- 2021-03-31 CN CN202110345435.XA patent/CN113088798A/en active Pending
Patent Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05214443A (en) * | 1992-02-05 | 1993-08-24 | Sumitomo Metal Ind Ltd | Production of high carbon steel wire rod for wiredrawing |
| JPH11256274A (en) * | 1998-03-11 | 1999-09-21 | Nippon Steel Corp | High strength ultra fine steel wire excellent in fatigue characteristic |
| KR20070068513A (en) * | 2005-12-27 | 2007-07-02 | 주식회사 포스코 | A wire rod for steel cord, and method for manufacturing the same |
| JP2007185692A (en) * | 2006-01-13 | 2007-07-26 | Kobe Steel Ltd | High carbon steel wire having excellent wire drawability and its production method |
| CN101649416A (en) * | 2009-09-04 | 2010-02-17 | 江苏省沙钢钢铁研究院有限公司 | High carbon steel wire rod and preparation method thereof |
| CN108138285A (en) * | 2015-10-23 | 2018-06-08 | 新日铁住金株式会社 | Wire Drawing steel wire material |
| CN105671443A (en) * | 2016-02-25 | 2016-06-15 | 邢台钢铁有限责任公司 | Hot-rolled wire rod for 1,960MPa-level cable rope galvanized steel wire and production method |
| CN107299280A (en) * | 2017-08-22 | 2017-10-27 | 青岛特殊钢铁有限公司 | 2000MPa grades of cable steel wires heat treatment wire rod and production method |
| CN110238230A (en) * | 2019-04-28 | 2019-09-17 | 江苏省沙钢钢铁研究院有限公司 | A kind of production method of superhigh intensity diamond wire wire rod |
| CN110669981A (en) * | 2019-10-02 | 2020-01-10 | 江苏省沙钢钢铁研究院有限公司 | Vanadium-boron composite microalloyed cord steel wire rod and production method thereof |
| CN111321352A (en) * | 2020-03-25 | 2020-06-23 | 中国铁道科学研究院集团有限公司 | Strength 2400 MPa-grade prestressed steel strand and production process thereof |
| CN112176258A (en) * | 2020-09-30 | 2021-01-05 | 江苏省沙钢钢铁研究院有限公司 | Wire rod for 2500 MPa-grade steel strand and manufacturing method thereof |
| 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 |
| CN112391584A (en) * | 2020-11-26 | 2021-02-23 | 青岛特殊钢铁有限公司 | Heat treatment wire rod for 2060MPa bridge cable steel wire and production method thereof |
Non-Patent Citations (2)
| Title |
|---|
| 王子亮: "《螺纹钢生产工艺与技术》", 31 July 2008, 冶金工业出版社 * |
| 阳辉等: "《轧钢厂设计原理》", 31 January 2011, 冶金工业出版社 * |
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| CN114318149A (en) * | 2021-12-28 | 2022-04-12 | 张家港荣盛特钢有限公司 | Grade 102 steel cord, grade 102 cord steel wire rod and production method thereof |
| CN114734009B (en) * | 2022-03-23 | 2024-04-02 | 江阴兴澄合金材料有限公司 | Steel wire rod for ultrahigh-strength card clothing and manufacturing method thereof |
| CN114734009A (en) * | 2022-03-23 | 2022-07-12 | 江阴兴澄合金材料有限公司 | Steel wire for ultrahigh-strength card clothing and manufacturing method thereof |
| CN114951573B (en) * | 2022-04-26 | 2024-04-02 | 江苏省沙钢钢铁研究院有限公司 | Wire rod for 12.9-grade fastener and production method thereof |
| CN114951573A (en) * | 2022-04-26 | 2022-08-30 | 江苏省沙钢钢铁研究院有限公司 | Wire rod for 12.9-grade fastener and production method thereof |
| CN116657062A (en) * | 2023-07-31 | 2023-08-29 | 江苏省沙钢钢铁研究院有限公司 | Wire rod for deep drawing and preparation method thereof |
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