CN114231719B - Electric pulse treatment method for improving strength of high-carbon steel hot-rolled wire - Google Patents
Electric pulse treatment method for improving strength of high-carbon steel hot-rolled wire Download PDFInfo
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- CN114231719B CN114231719B CN202111542521.6A CN202111542521A CN114231719B CN 114231719 B CN114231719 B CN 114231719B CN 202111542521 A CN202111542521 A CN 202111542521A CN 114231719 B CN114231719 B CN 114231719B
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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
- C21D10/00—Modifying the physical properties by methods other than heat treatment or deformation
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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
- C21D2211/003—Cementite
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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
- C21D2211/005—Ferrite
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- Heat Treatment Of Steel (AREA)
Abstract
The invention provides an electric pulse treatment method for improving the strength of a high-carbon steel hot-rolled wire rod, belonging to the technical field of steel wire rods. The method comprises the steps of rolling a high-carbon steel blank into a wire, cooling the wire at a controlled temperature, and finally performing electric pulse treatment on the cooled wire. Wherein the initial rolling temperature of the high-carbon steel billet is 950-1000 ℃, and the final rolling temperature is 870-920 ℃; an isothermal salt bath treatment process is adopted in the temperature-controlled cooling process, in the temperature-controlled cooling program, the wire obtained by hot rolling is cooled to the pearlite phase transition temperature of 570-600 ℃ at the cooling rate of 14-18 ℃/s, then the wire is kept at the temperature of 570-600 ℃ for 5-15 min to complete the transformation from austenite to pearlite, and the wire after heat preservation is air-cooled to the room temperature; the wire rod at room temperature is treated by electric pulse with the pulse frequency of 100-500 Hz and the effective pulse current of 30-500A/mm 2 The pulse processing time is 20-120 s. The electric pulse treatment method for the high-carbon steel hot-rolled wire rod can effectively improve the strength of the high-carbon steel hot-rolled wire rod, and is simple and feasible.
Description
Technical Field
The invention relates to the technical field of steel wire rods, in particular to an electric pulse treatment method for improving the strength of a high-carbon steel hot-rolled wire rod.
Background
With the rapid development of economy, the metal product industry in China enters a vigorous development period, and the using amounts of steel wire ropes for port hoisting, mine hoisting, cables, high-pressure rubber pipe reinforcing and bridge cables are increased more and more. The service properties of these steel wires are mostly determined by their own strength levels, and the strength of these steel wires is largely determined by the strength of the base high-carbon steel hot-rolled wire rod. Therefore, the improvement of the strength of the high-carbon steel hot-rolled wire rod has important significance for promoting the further development of the metal product industry in China.
At present, the method for improving the strength of the high-carbon steel hot-rolled wire rod at home and abroad is generally divided into two methods: firstly, a high-carbon steel alloy system is optimized; and the second is through controlling the cooling process. The prior art discloses high-carbon wire rod steel and a production process thereof, and the strength of the high-carbon wire rod is improved by optimizing the contents of Mn, cr and Nb elements in the steel. The prior art also discloses an extra-high strength steel cord, a wire rod for the extra-high strength steel cord and a production method thereof, wherein the wire rod is subjected to temperature control cooling by adopting a stelmor cooling line so as to improve the strength of a high-carbon wire rod. Although the strength of the high-carbon steel hot-rolled wire rod can be remarkably improved by optimizing a high-carbon steel alloy system, the production cost of the wire rod is greatly increased. The strength of the wire rod is improved by controlling the cooling process, the process conditions are harsh, and the strength of the wire rod is improved in a small range. Therefore, it is required to develop a novel treatment method capable of remarkably improving the strength of the high-carbon steel hot-rolled wire rod.
Disclosure of Invention
The invention provides an electric pulse treatment method for improving the strength of a high-carbon steel hot-rolled wire by combining rolling, temperature-controlled cooling and electric pulse.
The method is characterized in that the process optimization combining rolling, temperature control cooling and electric pulse is adopted, and the method for improving the strength of the high-carbon steel hot-rolled wire is provided from the aspects of rolling temperature, cooling process, pulse current, pulse frequency, pulse processing time and the like. On the premise of not changing the components of the high-carbon steel billet, the strength of the high-carbon steel hot-rolled wire is obviously improved, and the production cost of the high-carbon steel hot-rolled wire is reduced and the service performance of a steel wire metal product is improved. The specific process steps are as follows:
(1) Rolling the high-carbon steel blank into a wire rod in a hot rolling mode;
(2) Carrying out temperature control cooling on the wire rod obtained by rolling in the step (1);
(3) And (3) carrying out electric pulse treatment on the wire rod obtained by temperature control cooling in the step (2), wherein bidirectional pulses are adopted during the electric pulse treatment, and the pulse frequency is 100-500 Hz.
Wherein the initial rolling temperature of the hot rolling in the step (1) is 950-1000 ℃, and the final rolling temperature is 870-920 ℃.
The temperature-controlled cooling process in the step (2) adopts an isothermal salt bath treatment process.
In the isothermal salt bath treatment process, the wire obtained by hot rolling is cooled to the pearlite phase transition temperature of 570-600 ℃ at the cooling rate of 14-18 ℃/s.
And (3) after the wire is cooled to the pearlite phase transition temperature, preserving the heat for 5-15 min, and air-cooling the preserved wire to the room temperature.
The effective current of the pulse in the step (3) is 30-500A/mm 2 The pulse processing time is 20-120 s.
The principle of the method of the invention is as follows:
when a metallic material is treated with an electric pulse, it causes the microstructure of the material to evolve to a low resistance state, that is, the electric pulse treatment causes the material to tend to arrange the microstructure in such a way that the resistivity becomes lower. The microstructure of the high-carbon steel hot-rolled wire rod is a lamellar structure formed by alternately arranging lamellar cementite and ferrite, and the electrical resistivity of the high-carbon steel hot-rolled wire rod is much larger than that of the ferrite due to the fact that the cementite has higher carbon content and lower iron content. Therefore, when the high-carbon steel hot-rolled wire rod is treated by electric pulse, in order to reduce the self-resistivity of the material, the direction of the cementite laths arranged in the material in the direction perpendicular to the direction of the pulse current tends to be changed to be parallel to the direction of the pulse current.
The change of the alignment direction of the cementite lath is essentially accomplished by the diffusion of carbon atoms in the material. When the electric pulse treatment is performed, the cementite laths arranged in the direction perpendicular to the pulse current direction diffuse the carbon atoms in the cementite laths into the ferrite, and the cementite laths parallel to the pulse current direction are reformed in the ferrite. The electric pulse treatment time is short, and only a small part of carbon atoms are diffused into ferrite from cementite. Therefore, the original lamellar structure of the material is not damaged, and only some cementite strips which are arranged along the pulse current direction and have shorter sizes are formed in the ferrite. These newly formed lath-like cementite divides the ferrite originally in the form of lath into finer ferrite grains.
As described above, after the high carbon steel hot rolled wire rod is subjected to electric pulse treatment, not only ferrite grains in the material become finer, but also the lamellar microstructure is preserved. Therefore, the electric pulse treatment can effectively improve the strength of the high-carbon steel hot-rolled wire.
The technical scheme of the invention has the following beneficial effects:
in the scheme, the strength of the high-carbon steel hot-rolled wire is improved by the treatment process combining rolling, temperature-controlled cooling and electric pulse. Compared with the production process without electric pulse treatment, the production process of the invention has the advantage that the produced high-carbon steel hot-rolled wire has higher strength. The electric pulse treatment method for improving the strength of the high-carbon steel hot-rolled wire rod can effectively improve the strength of the high-carbon steel hot-rolled wire rod, and is simple and easy to implement.
Drawings
FIG. 1 is a schematic diagram of the process requirements of the electric pulse treatment method for improving the strength of a high-carbon steel hot-rolled wire rod according to the invention;
FIG. 2 is an SEM image of the microstructure of a high-carbon steel hot-rolled wire rod without electric pulse treatment in an example of the invention;
FIG. 3 is an SEM image of the microstructure of the high-carbon steel hot-rolled wire rod after electric pulse treatment in the example of the invention.
Detailed Description
To make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments.
The invention provides an electric pulse treatment method for improving the strength of a high-carbon steel hot-rolled wire.
As shown in fig. 1, the method (1) rolls a high-carbon steel billet into a wire rod by means of hot rolling;
(2) Carrying out temperature control cooling on the wire rod obtained by rolling in the step (1);
(3) And (3) carrying out electric pulse treatment on the wire rod obtained by temperature control cooling in the step (2), wherein bidirectional pulses are adopted during the electric pulse treatment, and the pulse frequency is 100-500 Hz.
Wherein the initial rolling temperature of the hot rolling in the step (1) is 950-1000 ℃, and the final rolling temperature is 870-920 ℃.
In the step (2), an isothermal salt bath treatment process is adopted in the temperature control cooling process. In the isothermal salt bath treatment process, the wire rod obtained by hot rolling is cooled to the pearlite phase transition temperature of 570-600 ℃ at the cooling rate of 14-18 ℃/s. And (3) after the wire is cooled to the pearlite phase transition temperature, preserving the heat for 5-15 min, and air-cooling the heat preserved wire to the room temperature.
In the step (3), the effective current of the pulse is 30-500A/mm 2 The pulse processing time is 20-120 s.
The following description is given with reference to specific embodiments.
Example 1
(1) Hot rolling a high-carbon steel billet with the carbon content of 0.82wt% to obtain a wire rod with the diameter of 12.5mm, wherein the initial rolling temperature is 950 ℃, and the final rolling temperature is 870 ℃.
(2) And (3) cooling the wire rod obtained by hot rolling to 570 ℃ at a cooling rate of 14 ℃/s by adopting a salt bath treatment process, then preserving the heat at 570 ℃ for 5min, air-cooling the wire rod after heat preservation to room temperature, wherein the strength of the obtained wire rod is 1100MPa, and the internal microstructure of the wire rod is shown in figure 2.
(3) Carrying out electric pulse treatment on the wire rod obtained by hot rolling and temperature control cooling, wherein the electric pulse parameters are as follows: bidirectional pulses are adopted; wherein the pulse frequency is 100Hz, and the pulse effective current is 30A/mm 2 The pulse processing time was 20 seconds. The microstructure inside the wire after the electric pulse treatment is shown in FIG. 3.
(4) After the electric pulse treatment, the tensile strength of the wire rod reaches 1230MPa. By comparing fig. 2 and fig. 3, it is found that some cementite strips which are arranged along the direction of the pulse current and have a short size are formed in the ferrite inside the high-carbon steel hot-rolled wire rod after the electric pulse treatment. These cementite laths divide the ferrite, which is originally strip-shaped, into finer ferrite grains. And the wire texture basically keeps the original sheet-shaped laminated structure.
Example 2
(1) Hot rolling a high-carbon steel billet with the carbon content of 0.93wt% to obtain a wire rod with the diameter of 13mm, wherein the initial rolling temperature is 975 ℃, and the final rolling temperature is 895 ℃.
(2) And (3) cooling the wire rod obtained by hot rolling to 585 ℃ at a cooling rate of 16 ℃/s by adopting a salt bath treatment process, then preserving the temperature of the wire rod for 10min at 585 ℃, and air-cooling the wire rod after heat preservation to room temperature to obtain the wire rod with the strength of 1235MPa.
(3) Carrying out electric pulse treatment on the wire rod obtained by hot rolling and temperature control cooling, wherein the electric pulse parameters are as follows: bidirectional pulse; wherein the pulse frequency is 250Hz, and the pulse effective current is 300A/mm 2 The pulse processing time was 60 seconds.
(4) After the electric pulse treatment, the tensile strength of the wire rod reaches 1380MPa.
Example 3
(1) High-carbon steel billets containing 1.03wt% of carbon are hot rolled to obtain wires with 13.5mm phi, the initial rolling temperature is 1000 ℃, and the final rolling temperature is 920 ℃.
(2) And cooling the wire rod obtained by hot rolling to 600 ℃ at the cooling rate of 18 ℃/s by adopting a salt bath treatment process, then preserving the heat at 600 ℃ for 15min, and air-cooling the preserved wire rod to room temperature, wherein the strength of the obtained wire rod is 1350MPa.
(3) Carrying out electric pulse treatment on the wire rod obtained by hot rolling and temperature control cooling, wherein the electric pulse parameters are as follows: bidirectional pulse; wherein the pulse frequency is 500Hz, and the effective pulse current is 500A/mm 2 The pulse processing time was 120 seconds.
(4) After the electric pulse treatment, the tensile strength of the wire rod reaches 1490MPa.
While the foregoing is directed to the preferred embodiment of the present invention, it will be appreciated by those skilled in the art that various changes and modifications may be made therein without departing from the principles of the invention as set forth in the appended claims.
Claims (2)
1. An electric pulse treatment method for improving the strength of a high-carbon steel hot-rolled wire is characterized by comprising the following steps:
(1) Rolling the high-carbon steel blank into a wire rod in a hot rolling mode;
(2) Carrying out temperature control cooling on the wire rod obtained by rolling in the step (1);
(3) Carrying out electric pulse treatment on the wire rod obtained by temperature control cooling in the step (2), wherein bidirectional pulses are adopted during the electric pulse treatment, and the pulse frequency is 100-500 Hz;
the temperature-controlled cooling process in the step (2) adopts an isothermal salt bath treatment process; in the isothermal salt bath treatment process, the wire rod obtained by hot rolling is cooled to the pearlite phase transition temperature of 570-600 ℃ at the cooling rate of 14-18 ℃/s; after the wire is cooled to the pearlite phase transition temperature, the temperature is kept for 5-15 min, and the wire after the temperature is kept is cooled to the room temperature by air;
the effective current of the pulse in the step (3) is 30-500A/mm 2 The pulse processing time is 20-120 s.
2. The electric pulse treatment method for improving the strength of the high-carbon steel hot-rolled wire rod as claimed in claim 1, wherein the initial rolling temperature of the hot rolling in the step (1) is 950 to 1000 ℃, and the final rolling temperature is 870 to 920 ℃.
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| CN202111542521.6A CN114231719B (en) | 2021-12-14 | 2021-12-14 | Electric pulse treatment method for improving strength of high-carbon steel hot-rolled wire |
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| CN202111542521.6A CN114231719B (en) | 2021-12-14 | 2021-12-14 | Electric pulse treatment method for improving strength of high-carbon steel hot-rolled wire |
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| CN114231719B true CN114231719B (en) | 2022-12-20 |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1482208A1 (en) * | 1987-01-12 | 1996-03-27 | А.А. Измирлиев | Steel part surface strengthening method |
| JP2001181790A (en) * | 1999-12-22 | 2001-07-03 | Nippon Steel Corp | High strength directly patenting rod and its manufacturing method |
| CN1904088A (en) * | 2006-07-04 | 2007-01-31 | 清华大学深圳研究生院 | Method of implementing on line softening annealing of medium, high carbon steel wire using high energy electric pulse |
| CN101693981A (en) * | 2009-10-23 | 2010-04-14 | 燕山大学 | Preparation method of low-alloy high-carbon steel with high-strength and high ductility nano structure |
| CN105779753A (en) * | 2016-05-12 | 2016-07-20 | 北京科技大学 | Device for realizing aging of hard wire coiled rod by applying pulse current and treatment method |
| CN110283988A (en) * | 2019-07-03 | 2019-09-27 | 吉林大学 | A kind of steel material Strengthening and Toughening new method based on pulse current |
| 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 |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5205877A (en) * | 1991-03-28 | 1993-04-27 | Bison Steel, Inc. | Process for making wire mesh screens |
| CN1613566A (en) * | 2004-12-07 | 2005-05-11 | 清华大学 | Electric plastic pulling enhancing process for high-carbon steel wire |
| CN1944692A (en) * | 2006-10-24 | 2007-04-11 | 江苏法尔胜技术开发中心 | High frequency electric pulse continous heat processing method for cold drawing medium and high carbon steel wire |
| CN111763813A (en) * | 2020-05-26 | 2020-10-13 | 东南大学 | Production method for treating high-strength high-toughness high-carbon steel wire by electric pulse |
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- 2021-12-14 CN CN202111542521.6A patent/CN114231719B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1482208A1 (en) * | 1987-01-12 | 1996-03-27 | А.А. Измирлиев | Steel part surface strengthening method |
| JP2001181790A (en) * | 1999-12-22 | 2001-07-03 | Nippon Steel Corp | High strength directly patenting rod and its manufacturing method |
| CN1904088A (en) * | 2006-07-04 | 2007-01-31 | 清华大学深圳研究生院 | Method of implementing on line softening annealing of medium, high carbon steel wire using high energy electric pulse |
| CN101693981A (en) * | 2009-10-23 | 2010-04-14 | 燕山大学 | Preparation method of low-alloy high-carbon steel with high-strength and high ductility nano structure |
| CN105779753A (en) * | 2016-05-12 | 2016-07-20 | 北京科技大学 | Device for realizing aging of hard wire coiled rod by applying pulse current and treatment method |
| CN110283988A (en) * | 2019-07-03 | 2019-09-27 | 吉林大学 | A kind of steel material Strengthening and Toughening new method based on pulse current |
| 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 |
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