CN111020107A - Method for controlling carbon segregation of high-carbon steel - Google Patents
Method for controlling carbon segregation of high-carbon steel Download PDFInfo
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- CN111020107A CN111020107A CN201911303968.0A CN201911303968A CN111020107A CN 111020107 A CN111020107 A CN 111020107A CN 201911303968 A CN201911303968 A CN 201911303968A CN 111020107 A CN111020107 A CN 111020107A
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- water
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- continuous casting
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
-
- 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
- C21C7/076—Use of slags or fluxes as treating agents
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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
Abstract
The invention discloses a method for controlling carbon segregation of high-carbon steel, which comprises the following steps: refining converter steelmaking in an LF furnace, and then continuously casting, heating, removing phosphorus in water, air cooling, collecting coils, PF (fiber reinforced plastics) wires, unloading coils and warehousing; wherein, the refined carbon component of the converter steelmaking is 0.72-0.75%, the refining temperature of the LF furnace is more than 1500 ℃, and the refining of the LF furnace is finely adjusted by using a carbon wire; wherein the heating temperature comprises 200-300 ℃; in the water phosphorus removal, the preparation method of the used water phosphorus removal agent comprises the following steps: 450-510g of ferrous sulfate heptahydrate is added into 1L of water at the temperature of 32-45 ℃ to prepare the water phosphorus removal agent. The method solves the problems that carbon segregation is one of the ubiquitous internal quality defects of the continuous casting slab, and the carbon segregation is difficult to eliminate in the subsequent rolling process, so that the yield and the performance of the product are seriously influenced.
Description
Technical Field
The invention relates to the field of steelmaking, in particular to a method for controlling carbon segregation of high-carbon steel.
Background
The high-carbon steel SWRH82B wire rod is a main raw material for producing PC steel wires and PC steel strands for a high-strength low-relaxation prestressed concrete structure, and during the drawing process, the wire rod is often broken by drawing due to the fact that central net-shaped cementite appears on the wire rod, so that the wire rod is extremely harmful to drawing. The central component segregation of the continuous casting billet is the main reason of generating martensite and network carbide at the center of the SWRH82B wire rod and generating conical fracture in the drawing process, and the carbon segregation causes the wire breakage in the drawing or stranding of the steel wire and can also reduce the mechanical property of the finished product. Carbon segregation is one of the ubiquitous internal quality defects of continuous casting slabs and is often difficult to eliminate in the subsequent rolling process, and the yield and the performance of the product are seriously influenced. The solute elements are redistributed in the solid-liquid phase, and the solute elements enriched along with solidification move to the center along with the solid-liquid phase interface and finally solidify to form segregation.
Disclosure of Invention
The invention aims to provide a method for controlling carbon segregation by high-carbon steel, which solves the problems that the carbon segregation is one of the ubiquitous internal quality defects of a continuous casting billet, and is difficult to eliminate in the subsequent rolling process, and the yield and the performance of a product are seriously influenced.
In order to achieve the above object, the present invention provides a method for controlling carbon segregation in a high carbon steel, the method comprising: refining converter steelmaking in an LF furnace, and then continuously casting, heating, removing phosphorus in water, air cooling, collecting coils, PF (fiber reinforced plastics) wires, unloading coils and warehousing;
wherein, the refined carbon component of the converter steelmaking is 0.72-0.75%, the refining temperature of the LF furnace is more than 1500 ℃, and the refining of the LF furnace is finely adjusted by using a carbon wire; wherein the heating temperature comprises 200-300 ℃;
in the water phosphorus removal, the preparation method of the used water phosphorus removal agent comprises the following steps: 450-510g of ferrous sulfate heptahydrate is added into 1L of water at the temperature of 32-45 ℃ to prepare the water phosphorus removal agent.
Preferably, the LF furnace refining adopts a white slag operation, and the holding time of the white slag operation is more than 20 min.
Preferably, in the LF furnace refining, the binary alkalinity R is 2.0-2.1, (FeO) + (MnO) < 1.2%, and the soft blowing time is more than or equal to 15 min.
Preferably, the superheat degree of the molten steel in the continuous casting ladle is controlled to be 20-30 ℃.
Preferably, the stable continuous casting speed is controlled to be 1.4-1.5 m/min.
Preferably, in continuous casting, terminal electromagnetic stirring is used and the current 400A, frequency 10 HZ.
Preferably, in the continuous casting, the secondary cooling adopts weak cooling water with the quantity of 0.4-0.5L/kg.
Through the technical scheme, the invention provides a method for controlling carbon segregation of high-carbon steel, which comprises the following steps: refining converter steelmaking in an LF furnace, and then continuously casting, heating, removing phosphorus in water, air cooling, collecting coils, PF (fiber reinforced plastics) wires, unloading coils and warehousing; wherein, the refined carbon component of the converter steelmaking is 0.72-0.75%, the refining temperature of the LF is more than 1500 ℃, and the refining of the LF uses a carbon line for fine adjustment. By controlling the influence of the superheat degree, the drawing speed, the secondary cooling specific water quantity and the tail end electromagnetic stirring (F-EMS) parameters on the center carbon segregation of the high-carbon steel billet, the rule of the carbon segregation and the continuous casting process parameters is found out, the optimal continuous casting process parameters are determined, the internal quality of the billet is improved, and the test results are used for guiding the actual production.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Detailed Description
The following describes in detail specific embodiments of the present invention. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For ranges of values, between the endpoints of each of the ranges and the individual points, and between the individual points may be combined with each other to give one or more new ranges of values, and these ranges of values should be considered as specifically disclosed herein.
Example 1
The invention provides a method for controlling carbon segregation of high-carbon steel, which comprises the following steps: refining converter steelmaking in an LF furnace, and then continuously casting, heating, removing phosphorus in water, air cooling, collecting coils, PF (fiber reinforced plastics) wires, unloading coils and warehousing; wherein, the refined carbon content of the converter steelmaking is 0.72 percent, the refining temperature of the LF furnace is 1600 ℃, the refining of the LF furnace is finely adjusted by using a carbon wire, and the heating temperature comprises 200 ℃; in the water phosphorus removal, the preparation method of the used water phosphorus removal agent comprises the following steps: adding 450g of ferrous sulfate heptahydrate into 1L of water at the temperature of 32 ℃ to prepare the water phosphorus removing agent, wherein the LF furnace refining adopts white slag operation, the holding time of the white slag operation is 25min, the binary alkalinity R in the LF furnace refining is 2, (FeO) + (MnO) is 1.1%, and the soft blowing time is 15min, the superheat degree of molten steel in continuous casting is controlled to be 20 ℃, the stable continuous casting drawing speed is controlled to be 1.4m/min, in the continuous casting, the tail end electromagnetic stirring is adopted, the current is 400A, the frequency is 10HZ, and in the continuous casting, the secondary cooling adopts weak cooling specific water quantity of 0.4L/kg.
Example 2
The invention provides a method for controlling carbon segregation of high-carbon steel, which comprises the following steps: refining converter steelmaking in an LF furnace, and then continuously casting, heating, removing phosphorus in water, air cooling, collecting coils, PF (fiber reinforced plastics) wires, unloading coils and warehousing; wherein, the refined carbon content of the converter steelmaking is 0.75 percent, the refining temperature of the LF furnace is 1700 ℃, the refining of the LF furnace is finely adjusted by using a carbon wire, and the heating temperature comprises 300 ℃; in the water phosphorus removal, the preparation method of the used water phosphorus removal agent comprises the following steps: adding 510g of ferrous sulfate heptahydrate into 1L of water at 45 ℃ to prepare the water phosphorus removing agent, wherein the LF furnace refining adopts white slag operation, the holding time of the white slag operation is 22min, the binary alkalinity R in the LF furnace refining is 2.1, (FeO) + (MnO) is 1%, the soft blowing time is 17min, the superheat degree of the molten steel in continuous casting is controlled to be 30 ℃, the stable continuous casting drawing speed is controlled to be 1.5m/min, in the continuous casting, the tail end electromagnetic stirring is adopted, the current is 400A, the frequency is 10HZ, and in the continuous casting, the weak cooling specific water quantity is 0.5L/kg for secondary cooling.
Example 3
The invention provides a method for controlling carbon segregation of high-carbon steel, which comprises the following steps: refining converter steelmaking in an LF furnace, and then continuously casting, heating, removing phosphorus in water, air cooling, collecting coils, PF (fiber reinforced plastics) wires, unloading coils and warehousing; wherein the refined carbon content of the converter steelmaking is 0.73%, the refining temperature of the LF furnace is 2000 ℃, the refining of the LF furnace is finely adjusted by using a carbon wire, and the heating temperature comprises 250 ℃; in the water phosphorus removal, the preparation method of the used water phosphorus removal agent comprises the following steps: 480g of ferrous sulfate heptahydrate is added into 1L of water at 40 ℃ to prepare the water phosphorus removing agent, wherein the LF furnace refining adopts white slag operation, the holding time of the white slag operation is 30min, the binary alkalinity R in the LF furnace refining is 2, (FeO) + (MnO) is 0.9%, the soft blowing time is 20min, the superheat degree of the molten steel in continuous casting is controlled to be 20-30 ℃, the stable continuous casting drawing speed is controlled to be 1.5m/min, in the continuous casting, the tail end electromagnetic stirring is adopted, the current is 400A, the frequency is 10HZ, and in the continuous casting, the secondary cooling adopts the weak cooling specific water quantity of 0.5L/kg.
The preferred embodiments of the present invention have been described in detail, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.
It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and the invention is not described in any way for the possible combinations in order to avoid unnecessary repetition.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.
Claims (7)
1. A method of controlling carbon segregation in high carbon steel, the method comprising: refining converter steelmaking in an LF furnace, and then continuously casting, heating, removing phosphorus in water, air cooling, collecting coils, PF (fiber reinforced plastics) wires, unloading coils and warehousing;
wherein, the refined carbon component of the converter steelmaking is 0.72-0.75%, the refining temperature of the LF furnace is more than 1500 ℃, and the refining of the LF furnace is finely adjusted by using a carbon wire;
wherein the heating temperature comprises 200-300 ℃;
in the water phosphorus removal, the preparation method of the used water phosphorus removal agent comprises the following steps: 450-510g of ferrous sulfate heptahydrate is added into 1L of water at the temperature of 32-45 ℃ to prepare the water phosphorus removal agent.
2. The method of claim 1, wherein the LF furnace refining employs a white slag operation, and the white slag operation is maintained for a time period greater than 20 min.
3. The method of claim 2, wherein in LF furnace refining, the binary basicity R is 2.0-2.1, (FeO) + (MnO) < 1.2%, and the soft blowing time is 15min or more.
4. The method as claimed in claim 3, wherein the superheat degree of the tundish steel in the continuous casting is controlled to be 20-30 ℃.
5. The method according to claim 4, wherein the steady continuous casting drawing speed is controlled to be 1.4-1.5 m/min.
6. The method of claim 5, wherein in continuous casting, terminal electromagnetic stirring is used and the current is 400A, at a frequency of 10 HZ.
7. The method as claimed in claim 6, wherein the secondary cooling uses a weak cooling ratio water amount of 0.4-0.5L/kg in the continuous casting.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911303968.0A CN111020107A (en) | 2019-12-17 | 2019-12-17 | Method for controlling carbon segregation of high-carbon steel |
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| CN201911303968.0A CN111020107A (en) | 2019-12-17 | 2019-12-17 | Method for controlling carbon segregation of high-carbon steel |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57200547A (en) * | 1981-06-05 | 1982-12-08 | Sumitomo Metal Ind Ltd | Preparation of high fatigue strength zn plated steel wire |
| CN101392313A (en) * | 2008-11-04 | 2009-03-25 | 首钢总公司 | Method for shortening high carbon steel aging time through online thermal insulation |
| CN101597713A (en) * | 2009-07-03 | 2009-12-09 | 首钢总公司 | A kind of microalloying SWRH87B gren rod and manufacture method thereof |
| CN101597676A (en) * | 2009-07-03 | 2009-12-09 | 首钢总公司 | A kind of method that solves big specification 82B wire rod heart portion and edging tissue difference |
| CN103014505A (en) * | 2012-12-31 | 2013-04-03 | 安阳钢铁股份有限公司 | Process for improving solidification quality of high-carbon steel casting blank |
| CN103060513A (en) * | 2011-10-24 | 2013-04-24 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for smelting tire cord steel and method for continuously casting tire cord steel |
| CN104498805A (en) * | 2014-12-29 | 2015-04-08 | 首钢总公司 | Production method of high-carbon low-nitrogen steel for strand wires |
-
2019
- 2019-12-17 CN CN201911303968.0A patent/CN111020107A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57200547A (en) * | 1981-06-05 | 1982-12-08 | Sumitomo Metal Ind Ltd | Preparation of high fatigue strength zn plated steel wire |
| CN101392313A (en) * | 2008-11-04 | 2009-03-25 | 首钢总公司 | Method for shortening high carbon steel aging time through online thermal insulation |
| CN101597713A (en) * | 2009-07-03 | 2009-12-09 | 首钢总公司 | A kind of microalloying SWRH87B gren rod and manufacture method thereof |
| CN101597676A (en) * | 2009-07-03 | 2009-12-09 | 首钢总公司 | A kind of method that solves big specification 82B wire rod heart portion and edging tissue difference |
| CN103060513A (en) * | 2011-10-24 | 2013-04-24 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for smelting tire cord steel and method for continuously casting tire cord steel |
| CN103014505A (en) * | 2012-12-31 | 2013-04-03 | 安阳钢铁股份有限公司 | Process for improving solidification quality of high-carbon steel casting blank |
| CN104498805A (en) * | 2014-12-29 | 2015-04-08 | 首钢总公司 | Production method of high-carbon low-nitrogen steel for strand wires |
Non-Patent Citations (3)
| Title |
|---|
| 王文培 等: "《高碳绞线钢SWRH82B中心碳偏析控制实践》", 《特殊钢》 * |
| 苏会东 等: "《水污染控制工程》", 31 May 2017, 中国建材工业出版社 * |
| 贺道中 等: "《湘钢SWRH82B/SAE1080质量分析与工艺控制》", 《炼钢》 * |
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Application publication date: 20200417 |
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