CN112195327A - Method for obtaining same structure with lead bath quenching process - Google Patents
Method for obtaining same structure with lead bath quenching process Download PDFInfo
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- CN112195327A CN112195327A CN202011089040.XA CN202011089040A CN112195327A CN 112195327 A CN112195327 A CN 112195327A CN 202011089040 A CN202011089040 A CN 202011089040A CN 112195327 A CN112195327 A CN 112195327A
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- Prior art keywords
- quenching
- tempering
- treatment
- same structure
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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
- 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
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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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/56—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering characterised by the quenching agents
- C21D1/60—Aqueous agents
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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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- 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
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- 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)
- Manufacturing & Machinery (AREA)
- Heat Treatment Of Articles (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Abstract
The invention belongs to the field of metallurgy, and particularly relates to a method for obtaining the same structure with a lead bath quenching process. The invention is characterized in that the method comprises the following steps of: firstly, quenching treatment and tempering treatment are carried out; then quenching treatment is carried out; finally, tempering and heat preservation are carried out; the obtained sorbite structure effectively improves the strength of steel, has environment-friendly quenching process and reduces the production cost. The product has good tensile strength, and good reduction of area and hardness.
Description
Technical Field
The invention belongs to the field of metallurgy, and particularly relates to a method for obtaining the same structure with a lead bath quenching process.
Background
The yield and the structural variety of the steel cord in China are increased year by year, steel cord production enterprises are also dedicated to the optimization of the production process all the time, the broken wire rate of each production process is continuously reduced through equipment improvement and process adjustment, and the production efficiency and the comprehensive yield are improved. The change of the quenching mode in the production practice brings great promotion to the stability and the efficiency of the steel cord production.
Quenching is a key process in the production of medium and high carbon steel wires, particularly a final heat treatment quenching process, the steel wires are quenched to obtain a sorbite structure, the structure has a higher tensile limit, the steel wires can obtain good comprehensive performance after being drawn, required mechanical indexes are provided for finished steel cords, and meanwhile, the phenomenon of wire breakage of the steel cords in the production process is reduced. The quenching modes of the cord steel wire mainly comprise lead bath quenching, sand bed quenching and water bath quenching.
Wherein, the lead bath quenching is a process of austenitizing the steel piece, then quenching and cooling the steel piece in molten lead to finish the structure transformation, and finally the structure is fine pearlite. This is a common process in the process of manufacturing steel wire of medium-carbon steel and high-carbon steel in order to obtain a proper structure for easy drawing and to obtain high quality. The main control technological parameter in the lead bath quenching process is the lead temperature and the time of the steel wire in lead liquid. The lead temperature design needs to consider different furnace types and cooling conditions (whether a lead liquid circulating pump is adopted or not). The lead temperature setting depends on the wire temperature, the diameter of the steel wire and the content of C in the steel wire, namely the lead temperature in the actual production should be taken within a reasonable range, and the lead bath quenching is widely applied in many enterprises.
However, the lead bath quenching has many defects, mainly manifested as lead pollution to the environment and harm to human health; threading is inconvenient and labor intensity is high; the lead liquid is easy to slag, the maintenance is complex, and the subsequent processing is influenced by hanging lead. Moreover, the lead bath can volatilize toxic gas and has high toxicity to human bodies, so that a green and pollution-free process needs to be developed to replace a lead bath quenching process.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a method for obtaining the same sorbite structure with a lead bath quenching process, and the method has the advantages of simple process, environmental protection and no pollution.
The present invention achieves the above-described object by the following technical means.
A method for obtaining the same structure with a lead bath quenching process, comprising the following steps: preparing raw materials, smelting molten steel, continuously casting into a blank, heating a continuously cast blank, rolling at high temperature, quenching after rolling, and performing post-treatment to obtain a finished product; the invention is characterized in that the method comprises the following steps of:
(1) quenching the rolled product at 870-900 ℃ for 10-30 minutes at a heating rate of 15 ℃/s; then cooling to 450-500 ℃ for tempering treatment for 0.5-1h, wherein the cooling rate is 5 ℃/s;
(2) quenching the immersed hot water obtained in the step (1) at the temperature of 90-100 ℃, and preserving heat for 2-3 h;
(3) tempering the product obtained in the step (2) at 200-210 ℃ for 1-2h, and keeping the temperature for 0.5-1 h; the obtained sorbite structure with the metallographic structure is obtained.
In the step (3), during tempering treatment, the heating rate is 2-3 ℃/s
The invention has the beneficial effects that:
(1) the sorbite structure obtained by the quenching process effectively improves the strength of steel, and the quenching process is environment-friendly and reduces the production cost.
(2) The steel obtained by the invention has good tensile strength, and good reduction of area and hardness performance.
Drawings
FIG. 1 is a photograph of a structure of a sample obtained in example 1 of the present invention under a 500-fold microscope.
Detailed Description
The invention will be further described with reference to the following figures and specific examples, but the scope of the invention is not limited thereto.
Example 1
(1) Quenching the rolled product at 870 ℃ for 30 minutes at a heating rate of 15 ℃/s; then the temperature is reduced to 450 ℃ for tempering treatment for 1h, and the temperature reduction rate is 5 ℃/s;
(2) quenching the immersed hot water obtained in the step (1) at the temperature of 90-100 ℃, and preserving heat for 2-3 h;
(3) tempering the product obtained in the step (2) at 200 ℃ for 2h, and preserving heat for 1 h; the obtained sorbite structure with the metallographic structure is obtained.
Example 2
(1) Quenching the rolled product at 880 ℃ for 20 minutes, wherein the heating rate is 15 ℃/s; then cooling to 460 ℃ for tempering treatment for 0.6h, wherein the cooling rate is 5 ℃/s;
(2) quenching the immersed hot water obtained in the step (1) at the temperature of 90-100 ℃, and preserving heat for 2-3 h;
(3) tempering the product obtained in the step (2) at 200 ℃ for 2h, and preserving heat for 0.6 h; the obtained sorbite structure with the metallographic structure is obtained.
Example 3
(1) Quenching the rolled product at 890 ℃ for 15 minutes, wherein the heating rate is 15 ℃/s; then cooling to 480 and tempering for 0.8h, wherein the cooling rate is 5 ℃/s;
(2) quenching the immersed hot water obtained in the step (1) at the temperature of 90-100 ℃, and preserving heat for 2-3 h;
(3) tempering the product obtained in the step (2) at 210 ℃ for 1h, and preserving heat for 0.8 h; the obtained sorbite structure with the metallographic structure is obtained.
Example 4
(1) Quenching the rolled product at 900 ℃ for 10 minutes at the heating rate of 15 ℃/s; then the temperature is reduced to 500 ℃ for tempering treatment for 0.5h, and the temperature reduction rate is 5 ℃/s;
(2) quenching the immersed hot water obtained in the step (1) at the temperature of 90-100 ℃, and preserving heat for 2-3 h;
(3) tempering the product obtained in the step (2) at 210 ℃ for 1h, and preserving heat for 0.5 h; the obtained sorbite structure with the metallographic structure is obtained.
Table 1 performance test data for products prepared in examples 1-4
| Hardness (HB) | Reduction of area (%) | Tensile strength (MPa) | |
| Example 1 | 225 | 32 | 950 |
| Example 2 | 213 | 30 | 960 |
| Example 3 | 220 | 28 | 954 |
| Example 4 | 223 | 29 | 935 |
The present invention is not limited to the above-described embodiments, and any obvious improvements, substitutions or modifications can be made by those skilled in the art without departing from the spirit of the present invention.
Claims (4)
1. A method for obtaining the same structure with a lead bath quenching process comprises the processes of raw material preparation, molten steel smelting, continuous casting and blank forming, continuous casting billet heating, high-temperature rolling, quenching after rolling and post-treatment; the method is characterized in that the quenching after rolling comprises the steps of quenching treatment and tempering treatment; then quenching treatment; finally, tempering and heat preservation are carried out.
2. The method for obtaining the same structure as that obtained by the patenting process according to claim 1, wherein the post-rolling quenching comprises the following specific steps:
(1) quenching the rolled product at 870-900 ℃ for 10-30 minutes; then cooling to 450-500 ℃ and tempering for 0.5-1 h;
(2) quenching the immersed hot water obtained in the step (1) at the temperature of 90-100 ℃, and preserving heat for 2-3 h;
(3) tempering the product obtained in the step (2) at 200-210 ℃ for 1-2h, and keeping the temperature for 0.5-1 h; the obtained sorbite structure with the metallographic structure is obtained.
3. The method for obtaining the same structure as that of the patenting process according to claim 1, wherein in the step (1), the temperature increase rate is 15 ℃/s during the quenching treatment; and during tempering, the cooling rate is 5 ℃/s.
4. The method for obtaining the same structure as that obtained by the patenting process according to claim 1, wherein in the step (3), the temperature increase rate is 2 to 3 ℃/s during the tempering treatment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011089040.XA CN112195327A (en) | 2020-10-13 | 2020-10-13 | Method for obtaining same structure with lead bath quenching process |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011089040.XA CN112195327A (en) | 2020-10-13 | 2020-10-13 | Method for obtaining same structure with lead bath quenching process |
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| CN112195327A true CN112195327A (en) | 2021-01-08 |
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| CN202011089040.XA Pending CN112195327A (en) | 2020-10-13 | 2020-10-13 | Method for obtaining same structure with lead bath quenching process |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102010979A (en) * | 2010-12-30 | 2011-04-13 | 无锡市新科冶金设备有限公司 | Steel wire through pipe type heating, water quenching and thermal insulation combined isothermal quenching device |
| CN103215430A (en) * | 2013-04-23 | 2013-07-24 | 冯伟年 | Novel technique for isothermal heat treatment of steel wire |
| CN105925771A (en) * | 2016-05-26 | 2016-09-07 | 南京科润工业介质股份有限公司 | Quenching medium and quenching method for steel cord |
| CN106653154A (en) * | 2016-12-23 | 2017-05-10 | 安徽天元电缆有限公司 | High-strength aluminum-clad steel wire and production method thereof |
| CN108103304A (en) * | 2018-01-23 | 2018-06-01 | 北京建通鸿翔科技有限公司 | A kind of steel wire austempering heat treatment process and equipment |
| CN110295316A (en) * | 2019-04-16 | 2019-10-01 | 江阴兴澄特种钢铁有限公司 | A kind of weaving fluffing fillet clothing steel wire rod and its manufacturing method |
-
2020
- 2020-10-13 CN CN202011089040.XA patent/CN112195327A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102010979A (en) * | 2010-12-30 | 2011-04-13 | 无锡市新科冶金设备有限公司 | Steel wire through pipe type heating, water quenching and thermal insulation combined isothermal quenching device |
| CN103215430A (en) * | 2013-04-23 | 2013-07-24 | 冯伟年 | Novel technique for isothermal heat treatment of steel wire |
| CN105925771A (en) * | 2016-05-26 | 2016-09-07 | 南京科润工业介质股份有限公司 | Quenching medium and quenching method for steel cord |
| CN106653154A (en) * | 2016-12-23 | 2017-05-10 | 安徽天元电缆有限公司 | High-strength aluminum-clad steel wire and production method thereof |
| CN108103304A (en) * | 2018-01-23 | 2018-06-01 | 北京建通鸿翔科技有限公司 | A kind of steel wire austempering heat treatment process and equipment |
| CN110295316A (en) * | 2019-04-16 | 2019-10-01 | 江阴兴澄特种钢铁有限公司 | A kind of weaving fluffing fillet clothing steel wire rod and its manufacturing method |
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Application publication date: 20210108 |
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