CN115181849B - Steel wire heat treatment method - Google Patents
Steel wire heat treatment method Download PDFInfo
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- CN115181849B CN115181849B CN202210789626.XA CN202210789626A CN115181849B CN 115181849 B CN115181849 B CN 115181849B CN 202210789626 A CN202210789626 A CN 202210789626A CN 115181849 B CN115181849 B CN 115181849B
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- Prior art keywords
- steel wire
- heat treatment
- cooling
- treatment method
- heating
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 74
- 239000010959 steel Substances 0.000 title claims abstract description 74
- 238000010438 heat treatment Methods 0.000 title claims abstract description 58
- 238000000034 method Methods 0.000 title claims abstract description 36
- 230000006698 induction Effects 0.000 claims abstract description 24
- 230000009466 transformation Effects 0.000 claims abstract description 20
- 238000001816 cooling Methods 0.000 claims abstract description 18
- 229910001562 pearlite Inorganic materials 0.000 claims abstract description 16
- 239000002826 coolant Substances 0.000 claims abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 19
- 238000010791 quenching Methods 0.000 claims description 5
- 230000000171 quenching effect Effects 0.000 claims description 4
- 229920000642 polymer Polymers 0.000 claims description 3
- 238000004093 laser heating Methods 0.000 claims description 2
- 239000000463 material Substances 0.000 claims description 2
- 238000007747 plating Methods 0.000 description 5
- 229910001369 Brass Inorganic materials 0.000 description 4
- 239000007864 aqueous solution Substances 0.000 description 4
- 239000010951 brass Substances 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 239000000243 solution Substances 0.000 description 3
- 230000006978 adaptation Effects 0.000 description 2
- 230000032798 delamination Effects 0.000 description 2
- 230000002500 effect on skin Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 229910001566 austenite Inorganic materials 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 229910000734 martensite Inorganic materials 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
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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
-
- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
-
- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/34—Methods of heating
- C21D1/42—Induction heating
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Abstract
The invention discloses a steel wire heat treatment method, which is characterized in that the steel wire is heated to be up to austenitizing cooling temperature of steel, and kept for a period of time; and then cooling the heated steel wire through a cooling medium to ensure that the temperature of the steel wire is kept within the pearlite transformation temperature until the pearlite transformation is finished, and applying medium-frequency induction heating in the pearlite transformation process. The intermediate frequency induction heating time is 0.5-3S. The medium frequency induction heating is performed in the cooling process or after cooling. According to the steel wire heat treatment method provided by the invention, intermediate frequency induction heating is applied in the pearlite transformation process, so that layering phenomenon of filaments obtained by drawing the steel wire in the torsion process can be avoided.
Description
Technical Field
The invention relates to a steel wire heat treatment method, and belongs to the technical field of steel wire treatment processes.
Background
With the development and progress of industry, steel wires for rubber skeleton materials are continuously explored and applied towards a direction of higher strength. For example, in addition to normal strength (NT), high strength (HT), ultra high Strength (ST), ultra high strength (UT), extremely high strength (MT) steel cords have been proposed, with a predicted filament strength of (4700-2000D) MPa, where D is the filament diameter. In general, steel cords are manufactured by drawing a wire rod into a steel wire of a predetermined diameter, performing heat treatment at least once, plating the steel wire rod, drawing the steel wire rod into filaments, and finally twisting the steel wire rod into a steel cord.
The heat treatment process is to heat austenitize the steel wire and then quench to obtain a fine pearlite structure to obtain a heat treated steel wire with better workability. However, the steel wire edge portion always has a low transformation temperature of the structure and the steel wire core portion has a high transformation temperature of the structure, whether it is quenched in air or in a special medium (lead, polymer solution, oil, etc.). This results in small spacing of the tissue plies at the wire edges, finely divided plies, high hardness at the wire edges, and large spacing of the tissue plies at the wire core, low hardness at the wire core. In addition, since the deformation amount of the edge portion of the steel wire is always larger than that of the core portion during the deep drawing process of the steel wire, this further aggravates the difference in hardness between the edge portion and the core portion of the filament obtained by drawing. The large difference in hardness between the edge and the core of the filament causes delamination of the filament during twisting, which is one of the reasons that restricts the obtaining of a higher strength steel wire product. In the prior art, the deformation of the last drawing pass is changed by adopting dual-mode drawing, or bending stress is applied to the steel wire by adopting a straightener to reduce the hardness difference between the edge part and the core part of the filament, but the method is a post-remedying measure and has limited practical effect.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a steel wire heat treatment method which can prevent layering of filaments obtained by drawing steel wires in the twisting process by applying medium-frequency induction heating in the pearlite transformation process.
In order to solve the technical problems, the invention adopts the following technical scheme:
a steel wire heat treatment method, comprising the steps of:
heating the steel wire to an austenitizing temperature of 900-1100 ℃ and keeping for a period of time; and cooling the heated steel wire by a cooling medium to ensure that the temperature of the steel wire is kept within the pearlite transformation temperature, the pearlite transformation temperature is 500-600 ℃, the temperature is lower than the austenite temperature and higher than the martensite transformation temperature until the pearlite transformation is finished, and medium-frequency induction heating is applied in the pearlite transformation process.
The steel wire heating adopts open fire furnace heating, muffle furnace heating, induction furnace heating, resistance heating or laser heating.
The cooling medium comprises air, water, quenching oil or quenching polymer solution.
The intermediate frequency induction heating time is 0.5-3S. The induction heating time is too short and the edge temperature of the steel wire cannot be made higher than the core temperature. The induction heating time is too long, and the temperature difference between the edge and the core is reduced or even the same due to the heat transfer between the edge and the core of the steel wire, thereby losing the intended effect.
The medium frequency induction heating is performed in the cooling process or after cooling.
The cooling medium is water and air, and the cooling medium sequentially passes through the first water bath section, the air section and the second water bath section.
The invention has the beneficial effects that: according to the steel wire heat treatment method provided by the invention, the steel wire is cooled in the cooling medium, and the intermediate frequency induction heating is applied in the pearlite transformation process, so that the intermediate frequency induction heating has a skin effect, the temperature of the edge part of the steel wire is high, the temperature of the core part is low, the edge transformation temperature of the steel wire can be ensured not to be lower than the core transformation temperature, the heat treatment steel wire with the edge hardness not higher than the core hardness is obtained, and after the heat treatment steel wire is further drawn into the filament, the difference between the edge part and the core part of the filament is small, and the torsion performance is good.
Detailed Description
The present invention is further described below, and the following examples are only for more clearly illustrating the technical solution of the present invention, but are not to be construed as limiting the scope of the present invention.
Example 1
Drawing a wire rod with the diameter of 5.50mm to a steel wire with the diameter of 1.80mm, austenitizing the steel wire at the temperature of 900-1100 ℃ in an open fire furnace, wherein the temperature of the steel wire at the open fire furnace is respectively 1020 ℃, 1040 ℃, 1015 ℃, 1000 ℃ and 980 ℃ in a five-zone open fire furnace, and then cooling in two sections of aqueous solutions, wherein the cooling process is that the length of a first water bath section is WT1=150 mm, the length of an AIR section is=250 mm, and the length of a second water bath section is WT2=40 mm. Meanwhile, induction heating is carried out before the second water bath section, the heating voltage is 400V, and (current data can be added) the current is 110A, and the heating time is 1S. After brass plating on 1.80mm heat treated steel wire, drawing to 0.235mm, and detecting torsion performance by using a torsion layering instrument.
Example 2
Drawing a wire rod with the diameter of 5.50mm to a steel wire with the diameter of 1.80mm, austenitizing the steel wire at the temperature of 900-1100 ℃ in an open fire furnace, wherein the temperature of the steel wire at the open fire furnace is respectively 1020 ℃, 1040 ℃, 1015 ℃, 1000 ℃ and 980 ℃ in a five-zone open fire furnace, and then cooling in two sections of aqueous solutions, wherein the cooling process is that the length of a first water bath section is WT1=150 mm, the length of an AIR section is=250 mm, and the length of a second water bath section is WT2=40 mm. Meanwhile, induction heating is carried out in the second water bath section, the heating voltage is 400V, the current is 110A, and the heating time is 0.5S. After brass plating on 1.80mm heat treated steel wire, drawing to 0.235mm, and detecting torsion performance by using a torsion layering instrument.
Example 3
Drawing a wire rod with the diameter of 5.50mm to a steel wire with the diameter of 1.80mm, austenitizing the steel wire at the temperature of 900-1100 ℃ in an open fire furnace, wherein the temperature of the steel wire at the open fire furnace is 15-50S, the temperature of a five-zone open fire furnace is 1020 ℃, 1040 ℃, 1015 ℃, 1000 ℃ and 980 ℃ respectively, and then cooling in two sections of aqueous solutions, wherein the cooling process comprises the steps of enabling the length of a first water bath section to be WT1=150 mm, enabling the length of an AIR section to be AIR=250 mm and enabling the length of a second water bath section to be WT2=40 mm. Meanwhile, induction heating is carried out after the second water bath section, the heating voltage is 400V, the current is 110A, and the heating time is 3S. After brass plating on 1.80mm heat treated steel wire, drawing to 0.235mm, and detecting torsion performance by using a torsion layering instrument.
In the case of comparative example 1,
drawing a wire rod with the diameter of 5.50mm to a steel wire with the diameter of 1.80mm, austenitizing the steel wire at the temperature of 900-1100 ℃ in an open fire furnace, wherein the temperature of the steel wire at the open fire furnace is respectively 1020 ℃, 1040 ℃, 1015 ℃, 1000 ℃ and 980 ℃ in a five-zone open fire furnace, and then cooling in two sections of aqueous solutions, wherein the cooling process is that the length of a first water bath section is WT1=150 mm, the length of an AIR section is=250 mm, and the length of a second water bath section is WT2=40 mm. Induction heating is not performed. After brass plating on 1.80mm heat treated steel wire, drawing to 0.235mm, and detecting torsion performance by using a torsion layering instrument.
The comparative test was carried out in this example and comparative example of the prior art, and the test results are shown in Table 1.
TABLE 1
As can be seen from Table 1, comparative example 1 has a higher hardness at the edge of a 1.80mm steel wire than at the core, and a larger difference between the hardness at the edge and the hardness at the core, and has poor monofilament torsional properties and delamination, because no medium frequency induction heating is used. In the embodiments 1-3 of the method, the intermediate frequency induction heating is applied in the pearlite transformation process, and the temperature of the edge of the steel wire is not lower than the temperature of the core of the steel wire due to the skin effect of the induction heating, so that the hardness of the edge of the steel wire is basically close to the hardness of the core, the single filament torsion value is higher, and the single filament torsion value is not layered.
The foregoing is only a preferred embodiment of the invention, it being noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the present invention, and such modifications and adaptations are intended to be comprehended within the scope of the invention.
Claims (6)
1. A steel wire heat treatment method is characterized in that: the method comprises the following steps:
heating the steel wire to the austenitizing temperature of the steel material and maintaining the steel wire for a period of time;
and then cooling the heated steel wire by a cooling medium to ensure that the temperature of the steel wire is kept within the pearlite transformation temperature until the pearlite transformation is finished, and applying medium-frequency induction heating in the pearlite transformation process, wherein the pearlite transformation temperature is 500-600 ℃, and the medium-frequency induction heating time is 0.5-3S.
2. A steel wire heat treatment method according to claim 1, characterized in that: the steel wire heating adopts open fire furnace heating, muffle furnace heating, induction furnace heating, resistance heating or laser heating.
3. A steel wire heat treatment method according to claim 1, characterized in that: the cooling medium comprises air, water, quenching oil or quenching polymer solution.
4. A steel wire heat treatment method according to claim 1, characterized in that: the medium frequency induction heating is performed in the cooling process or after cooling.
5. A steel wire heat treatment method according to claim 3, wherein: the cooling medium is water and air, and the cooling medium sequentially passes through the first water bath section, the air section and the second water bath section.
6. A steel wire heat treatment method according to claim 1, characterized in that: the austenitizing temperature is 900-1100 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210789626.XA CN115181849B (en) | 2022-07-06 | 2022-07-06 | Steel wire heat treatment method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210789626.XA CN115181849B (en) | 2022-07-06 | 2022-07-06 | Steel wire heat treatment method |
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| Publication Number | Publication Date |
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| CN115181849A CN115181849A (en) | 2022-10-14 |
| CN115181849B true CN115181849B (en) | 2024-01-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210789626.XA Active CN115181849B (en) | 2022-07-06 | 2022-07-06 | Steel wire heat treatment method |
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| Country | Link |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102220474A (en) * | 2011-05-31 | 2011-10-19 | 王颖 | Thin steel wire atomizing cooling treatment method and device |
| CN108103282A (en) * | 2018-01-23 | 2018-06-01 | 北京建通鸿翔科技有限公司 | A kind of wire rod heat-treatment technology method |
| CN113416834A (en) * | 2021-01-26 | 2021-09-21 | 陈冬英 | Steel wire heat treatment quenching process |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3938240B2 (en) * | 1998-02-25 | 2007-06-27 | 株式会社ブリヂストン | Steel wire and manufacturing method thereof |
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2022
- 2022-07-06 CN CN202210789626.XA patent/CN115181849B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102220474A (en) * | 2011-05-31 | 2011-10-19 | 王颖 | Thin steel wire atomizing cooling treatment method and device |
| CN108103282A (en) * | 2018-01-23 | 2018-06-01 | 北京建通鸿翔科技有限公司 | A kind of wire rod heat-treatment technology method |
| CN113416834A (en) * | 2021-01-26 | 2021-09-21 | 陈冬英 | Steel wire heat treatment quenching process |
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| Publication number | Publication date |
|---|---|
| CN115181849A (en) | 2022-10-14 |
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