CN114892069A - Method for producing copper-clad wire rod without molten iron pretreatment process - Google Patents
Method for producing copper-clad wire rod without molten iron pretreatment process 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
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/004—Very low carbon steels, i.e. having a carbon content of less than 0,01%
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
- B21B1/463—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting in a continuous process, i.e. the cast not being cut before rolling
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/064—Dephosphorising; Desulfurising
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/068—Decarburising
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/10—Handling in a vacuum
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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
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- 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
- Y02P10/20—Recycling
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Abstract
A method for producing a copper-clad wire rod by a molten iron pretreatment-free process comprises the following chemical components of, by weight, less than or equal to 0.005% of C, less than or equal to 0.005% of Si, less than or equal to 0.05% of Mn, less than or equal to 0.005% of P, less than or equal to 0.005% of S, and the balance of Fe and inevitable impurities. The method comprises the steps of controlling the manganese content of steel tapped from a converter to be below 0.07% under the condition of no molten iron pretreatment desulfurization process and molten iron and scrap steel with normal Mn content, carrying out oxidation demanganization in the early stage of an LF refining process to control the manganese content to be below 0.05%, removing refining slag, and then carrying out deoxidation on the molten steel to produce white slag to remove the sulfur content in the molten steel. And finally controlling the molten steel components to be less than or equal to 0.003 percent of C, less than or equal to 0.050 percent of Mn, less than or equal to 0.005 percent of S and 50-60 ppm of active oxygen by RH decarburization, and realizing multi-furnace stable continuous casting production by adopting 150-square billet continuous casting. The rolling adopts low-temperature and rapid heating, and cracks caused in the rolling process due to FeS and FeO crystal boundary precipitation are avoided. The detection conductivity of the rolled wire rod is more than or equal to 16.5, and the use requirement is met.
Description
Technical Field
The invention belongs to the technical field of metallurgy, and relates to a production method of a copper-clad wire rod with the electric conductivity of more than 16.5.
Background
The copper-clad wire rod is widely applied to the field of weak current wires such as telephone wires, network wires and data wires, and the electric conductivity and the drawing performance are key indexes of the copper-clad wire rod. In order to control the conductivity and the drawing performance of the alloy, most production enterprises adopt a process route of 'molten iron pretreatment-converter-LF-RH-slab continuous casting-cutting into small square billets-high-speed wire rolling', wherein the molten iron pretreatment process mainly comprises demanganization and desulfurization.
But some steel enterprises are limited by pretreatment and continuous casting process equipment and cannot produce the steel according to the process. The mass production is required to be realized on the process route of converter-LF-RH-billet continuous casting-high-speed wire rolling, and the condition of the prior art is overcome to meet the production requirement of copper-clad wires of users.
Disclosure of Invention
The invention aims to provide a method for producing a copper-clad wire rod without a molten iron pretreatment process, and solves the technical problem that equipment without molten iron pretreatment and the like cannot produce the steel.
The technical scheme of the invention is as follows:
a method for producing a copper-clad wire rod by a molten iron-free pretreatment process comprises the following chemical components of, by weight, less than or equal to 0.005% of C, less than or equal to 0.005% of Si, less than or equal to 0.05% of Mn, less than or equal to 0.005% of P, less than or equal to 0.005% of S, and the balance of Fe and inevitable impurities; the method comprises the following steps:
(1) preparing raw materials: the manganese content of the molten iron fed into the furnace is required to be less than or equal to 0.40 percent, and the manganese content of the scrap steel is required to be less than or equal to 0.60 percent.
(2) Converter earlier stage: and (3) promoting manganese in molten iron to be oxidized into slag by adopting a large-slag-quantity operation in the early stage of converter oxygen blowing smelting, pouring the early-stage slag after blowing for 3min in the early stage, and then adding slag charge to continue blowing.
(3) In the middle and later periods of the converter: in the later stage of smelting in the converter, oxygen blowing and decarburization are carried out on the molten steel, so that the end point oxygen content is improved, and manganese in the molten steel is further oxidized and removed; adding slag materials to carry out cooling and slag thickening operation so as to prevent tapping and slag discharging.
(4) And (3) end point control: the manganese content during converter tapping is controlled to be less than or equal to 0.070 percent, and deoxidation and alloying are not carried out during the tapping process; and after tapping, conveying the molten steel to an LF furnace for refining.
(5) LF refining and slag fishing: and (3) performing LF refining temperature rise operation, stirring argon with proper strength to reduce the Mn of the molten steel to be less than 0.05%, and then performing slag dragging operation on the refining slag.
(6) LF refining and desulfurization: and after the slag is fished, feeding an aluminum wire for deoxidation, and adding refined synthetic slag for white slag deoxidation and desulfurization, wherein the Mn content of the slag discharged from the LF is less than or equal to 0.050%, and the S content of the slag discharged from the LF is less than or equal to 0.003%.
(7) RH decarburization: blowing oxygen into RH for decarburization, decarburizing the carbon to be below 30ppm, adding an aluminum block for deoxidation, and controlling the RH outbound activity oxygen to be 50-60 ppm.
(8) Continuous casting: 150 square small square billets are continuously cast, the casting is protected in the whole process, and the temperature of the billet of the feeding straightening machine is controlled to be more than 1100 ℃.
(9) High-speed wire rolling: the steel rolling is rapidly heated at low temperature, the tapping temperature is 900-950 ℃, the heating time is less than or equal to 90min, and the spinning temperature is 830-850 ℃.
The principle of the invention is as follows: in order to control the conductivity of the copper-clad wire, the contents of carbon and manganese in the steel need to be reduced as much as possible, the Mn/S ratio is low after the content of manganese is reduced, and serious surface defects can occur when the billet is rolled. The method controls the manganese of the steel tapped from the converter to be below 0.07 percent under the condition of no molten iron pretreatment desulfurization process and molten iron and scrap steel with normal Mn content, performs oxidation demanganization to control the manganese to be below 0.05 percent in the early stage of the LF refining process, removes refining slag, and performs deoxidation on the molten steel to produce white slag to remove the sulfur content in the molten steel. And finally controlling the molten steel components to be less than or equal to 0.003 percent of C, less than or equal to 0.050 percent of Mn, less than or equal to 0.005 percent of S and 50-60 ppm of active oxygen by RH decarburization, and realizing multi-furnace stable continuous casting production by adopting 150-square billet continuous casting. The rolling adopts low-temperature and rapid heating, and cracks caused in the rolling process due to FeS and FeO crystal boundary precipitation are avoided. The detection conductivity of the rolled wire rod is more than or equal to 16.5, and the use requirement of customers is met.
The invention has the beneficial effects that: the invention provides a production method for producing a copper-clad wire rod by adjusting a smelting process without a molten iron pretreatment process and common molten iron and scrap steel.
Drawings
FIG. 1 is a photograph (100 times) of a metallographic structure of M6.
Detailed Description
Example 1:
a method for producing a copper-clad wire rod without molten iron pretreatment. The process comprises the following steps:
(1) preparing raw materials: adding molten iron and scrap steel in a converter for smelting, wherein the molten iron is 85.2t, the scrap steel is 21.1t, and the molten iron contains C =4.86%, Si =0.46%, Mn =0.035%, and S = 0.0041%.
(2) Converter earlier stage: adding a first batch of slag charge to carry out slagging in the earlier stage of smelting in the converter, wherein the added slag charge is as follows: lime 3.13t and dolomite 1.22t, top-bottom combined blowing operation is carried out in the blowing process, the oxygen supply flow is controlled according to normal requirements, the lance position adopts a low lance position and is properly adjusted according to actual conditions, slag is rapidly melted, blowing is carried out for 3min after slagging is finished, and early-stage slag of 2/3 is poured out.
(3) In the middle and later periods of the converter: and (3) pouring the earlier-stage slag, adding a second batch of slag material, wherein the adding amount of the second batch of slag material is 3.1t, blowing by adopting a normal top-blown oxygen supply process (oxygen lance position, flow and the like), adding 500kg of ore due to the fact that the actual temperature of the converter is high in the blowing process, and adding 500kg of dolomite for thick slag operation due to the fact that the slag is too thin before tapping.
(4) And (3) end point control: the end point temperature of the converter is 1623 ℃, the end point carbon content is 0.067%, the end point Mn content is 0.066%, the end point sulfur content is 0.025%, strict slag stopping operation is carried out in the tapping process, tapping and slag discharging are strictly forbidden, and 301kg of lime is added in the tapping process.
(5) LF refining and slag fishing: after tapping, hoisting the ladle to an LF refining station for refining; after the temperature of molten steel is raised to 1600 ℃ in LF refining, stirring for 5min by argon gas, sampling and detecting the Mn content by 0.035%, and then carrying out slag dragging operation.
(6) LF refining and desulfurization: adding 521KG lime again after slag removal, refining synthetic slag with 302Kg, slagging and deoxidizing, feeding aluminum wire with 603 m to molten steel, making white slag, deoxidizing and desulfurizing, and discharging a component C in an LF furnace: 0.041%, Mn: 0.042%, S: 0.003%.
(7) RH decarburization: blowing 131m oxygen gas into RH, after the carbon-oxygen reaction is finished, fixing oxygen to 255ppm, then adding 43.1Kg of aluminum blocks for deoxidation, at this time, fixing oxygen to 52.6ppm of molten steel, breaking the air and standing, and then casting on the upper table.
(8) Continuous casting: the continuous casting drawing speed is 2.5m/min, the specific water amount is 1.3KG/L, the temperature of a billet entering a drawing and straightening machine is 1100-1150 ℃, and the component detection of a finished product C: 0.0026%, Mn: 0.047%, S: 0.0041 percent.
(9) High-speed wire rolling: heating for 78min, discharging at 910 deg.C, spinning at 835 deg.C, and rolling to 6.5mm specification.
And (3) detecting the mechanical property and the electric conductivity of the sample, wherein the tensile strength is 289MPa, and the electric conductivity is 16.91%.
Example 2:
a method for producing a copper-clad wire 9 wire rod without molten iron pretreatment process. The process comprises the following steps:
(1) preparing raw materials: molten iron and scrap steel are added in a converter for smelting, wherein 84.3t of molten iron and 21.5t of scrap steel are added, the carbon content in the molten iron is 4.91%, the Si content is 0.41%, the Mn content is 0.033%, and the S content is 0.0042%.
(2) Converter earlier stage: adding a first batch of slag charge to carry out slagging in the earlier stage of smelting in the converter, wherein the added slag charge is as follows: lime 3.05t and dolomite 1.13t, top-bottom combined blowing operation is carried out in the converting process, the oxygen supply flow is controlled according to normal requirements, the lance position adopts a low lance position and is properly adjusted according to actual conditions, slag is rapidly melted, blowing is carried out for 3min after slagging is finished, and early-stage slag of 2/3 is poured.
(3) In the middle and later periods of the converter: and (3) pouring the earlier-stage slag, adding a second batch of slag material, wherein the adding amount of the second batch of slag material is 3.12t of lime, blowing by adopting a normal top-blown oxygen supply process (oxygen lance position, flow and the like), adding 500kg of ore due to the fact that the actual temperature of the converter is high in the blowing process, and adding 500kg of dolomite for thick slag operation due to the fact that the slag is too thin before tapping.
(4) And (3) end point control: the end point temperature of the converter is 1620 ℃, the end point carbon content is 0.062%, the end point Mn content is 0.062%, the end point sulfur content is 0.028%, strict slag stopping operation is carried out in the tapping process, tapping and slag discharging are strictly forbidden, and 302kg of lime is added in the tapping process.
(5) LF refining and slag fishing: after tapping, hoisting the ladle to an LF refining station for refining; after the temperature of molten steel is raised to 1600 ℃ in LF refining, stirring for 5min by argon gas, sampling and detecting the Mn content by 0.033%, and then carrying out slag fishing operation.
(6) LF refining and desulfurization: after slag fishing, adding 518KG lime again, refining synthetic slag with 302KG for slagging and deoxidizing, feeding aluminum wires 609 m into molten steel, making white slag for deoxidizing and desulfurizing, and discharging a component C of an LF furnace: 0.038%, Mn: 0.041%, S: 0.0029%.
(7) RH decarburization: blowing oxygen gas at 135m in RH, after the carbon-oxygen reaction is finished, fixing oxygen at 268ppm, then adding 45.1Kg of aluminum blocks for deoxidation, at the moment, fixing oxygen at 54.3ppm in the molten steel, breaking the air and standing, and then casting on the upper table.
(8) Continuous casting: the continuous casting drawing speed is 2.5m/min, the specific water amount is 1.3KG/L, the temperature of a billet entering a drawing and straightening machine is 1100-1150 ℃, and the component detection of a finished product C: 0.0023%, Mn: 0.045%, S: 0.0039 percent.
(9) High-speed wire rolling: high speed wire rolling, heating time 83min, discharging at 916 deg.C, spinning temperature 839 deg.C, and rolling to 6.5mm specification.
And (3) detecting the mechanical property and the electric conductivity of the sample, wherein the tensile strength is 292MPa, and the electric conductivity is 17.03%.
Claims (1)
1. A method for producing a copper-clad wire rod without molten iron pretreatment process is characterized by comprising the following steps: the steel comprises the chemical components of, by weight, less than or equal to 0.005% of C, less than or equal to 0.005% of Si, less than or equal to 0.05% of Mn, less than or equal to 0.005% of P, less than or equal to 0.005% of S, and the balance of Fe and inevitable impurities; the method comprises the following steps:
(1) preparing raw materials: the manganese in the molten iron fed into the furnace is required to be less than or equal to 0.40 percent, and the manganese in the scrap steel is required to be less than or equal to 0.60 percent;
(2) the converter front stage: in the early stage of converter oxygen blowing smelting, the operation of large slag amount is adopted to promote manganese in molten iron to be oxidized and enter slag, the early stage slag is poured after blowing for 3min in the early stage, and then slag charge is added for continuous blowing;
(3) in the middle and later periods of the converter: in the later stage of smelting in the converter, oxygen blowing and decarburization are carried out on the molten steel, so that the end point oxygen content is improved, and manganese in the molten steel is further oxidized and removed; adding slag materials to carry out cooling and slag thickening operation so as to prevent tapping and slag discharging;
(4) and (3) end point control: the manganese content during converter tapping is controlled to be less than or equal to 0.070 percent, and deoxidation and alloying are not carried out during the tapping process; after tapping, conveying the molten steel to an LF furnace for refining;
(5) LF refining and slag fishing: LF refining is carried out, the temperature is raised, argon stirring with proper strength is carried out, the Mn of the molten steel is reduced to be below 0.05%, and then slag dragging operation is carried out on the refining slag;
(6) LF refining and desulfurization: feeding an aluminum wire for deoxidation after the slag is fished, adding refined synthetic slag for white slag deoxidation and desulfurization, wherein Mn is less than or equal to 0.050 percent and S is less than or equal to 0.003 percent when the slag is discharged from the LF furnace;
(7) RH decarburization: blowing oxygen into RH for decarburization, decarburizing the carbon to be below 30ppm, adding an aluminum block for deoxidation, and controlling the RH outbound activity oxygen to be 50-60 ppm;
(8) continuous casting: continuous casting is carried out on 150-square small square billets, the casting is protected in the whole process, and the temperature of a billet of a withdrawal and straightening machine is controlled to be more than 1100 ℃;
(9) high-speed wire rolling: the steel rolling is rapidly heated at low temperature, the tapping temperature is 900-950 ℃, the heating time is less than or equal to 90min, and the spinning temperature is 830-850 ℃.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117004868A (en) * | 2023-09-28 | 2023-11-07 | 张家港荣盛特钢有限公司 | High-conductivity wire rod and production method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109943680A (en) * | 2017-12-21 | 2019-06-28 | 广东韶钢松山股份有限公司 | A kind of Ultra-low carbon, the production method of low silicon, low manganese and low aluminum steel continuous casting billet |
| CN112342455A (en) * | 2020-10-28 | 2021-02-09 | 湖南华菱湘潭钢铁有限公司 | Smelting method of industrial pure iron |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109943680A (en) * | 2017-12-21 | 2019-06-28 | 广东韶钢松山股份有限公司 | A kind of Ultra-low carbon, the production method of low silicon, low manganese and low aluminum steel continuous casting billet |
| CN112342455A (en) * | 2020-10-28 | 2021-02-09 | 湖南华菱湘潭钢铁有限公司 | Smelting method of industrial pure iron |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117004868A (en) * | 2023-09-28 | 2023-11-07 | 张家港荣盛特钢有限公司 | High-conductivity wire rod and production method thereof |
| CN117004868B (en) * | 2023-09-28 | 2023-12-22 | 张家港荣盛特钢有限公司 | High-conductivity wire rod and production method thereof |
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