CN116144879A - Method for reducing center segregation and porosity of wear-resistant steel casting blank - Google Patents
Method for reducing center segregation and porosity of wear-resistant steel casting blank Download PDFInfo
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- CN116144879A CN116144879A CN202310083689.8A CN202310083689A CN116144879A CN 116144879 A CN116144879 A CN 116144879A CN 202310083689 A CN202310083689 A CN 202310083689A CN 116144879 A CN116144879 A CN 116144879A
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- porosity
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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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- 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
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/114—Treating the molten metal by using agitating or vibrating means
- B22D11/115—Treating the molten metal by using agitating or vibrating means by using magnetic fields
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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
- B22D11/18—Controlling or regulating processes or operations for pouring
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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
- B22D11/20—Controlling or regulating processes or operations for removing cast stock
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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
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/50—Pouring-nozzles
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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
- C21C7/0006—Adding metallic additives
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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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- 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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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Continuous Casting (AREA)
Abstract
The invention discloses a method for reducing center segregation and porosity of a wear-resistant steel casting blank, which reduces the center segregation and porosity of the casting blank by controlling production process parameters of a converter, refining and continuous casting.
Description
Technical Field
The invention relates to the technical field of ferrous metallurgy, in particular to a method for reducing center segregation and porosity of a wear-resistant steel casting blank.
Background
The state of motion of molten steel at the solidification end of a continuous casting billet is an important factor affecting the internal quality of the casting billet. Because of the different solubilities in the liquid and solid phases of the metal, during casting solidification, a large amount of solute elements can be gathered in local areas, so that the content of C, mn and other elements in the center of a casting blank is obviously higher than that in other parts, and center segregation is formed. Because dendrite bridging can cause insufficient feeding at the position of the solidification end, after the casting blank is completely solidified, a hole is left at the center of the casting blank which cannot be fed with molten steel, and a central shrinkage cavity is formed.
The wear-resistant steel not only has good toughness and wear resistance, but also can bear impact and contact stress well, so that the internal quality requirement of a casting blank is strict. Because the wear-resistant steel has higher carbon content, manganese content and the like, segregation and looseness are easier to form in the center of the casting blank, and therefore, the segregation and looseness in the center of the casting blank are reduced through the control of the steelmaking continuous casting production process.
The Chinese patent with the application number of 201210039431.X discloses a method for improving center segregation and shrinkage of square and round billets, wherein when the casting billets are cooled, a cooling mode that the cooling intensity in the inner and outer arc directions of the casting billets is consistent, the cooling intensity in the left and right side directions is consistent, the cooling intensity in the inner and outer arc directions is greater than the cooling intensity in the left and right side directions is adopted, and the center segregation and shrinkage of the continuous casting billets with similar cross section width and thickness dimensions such as the square and round billets are improved by controlling the distribution mode of segregation solute elements and solidification shrinkage, so that the effect is obvious and the effect is stable.
Chinese patent application No. 201810525050.X discloses a process for reducing center segregation of a casting blank, the process comprising the steps of: 1) The purity of molten steel and the inclusion content in the steel are controlled; 2) Pressing the front blank shell belly and controlling the front blank shell belly to be pressed down greatly; the method mainly adopts a technique of firstly bulging a casting blank and then lightly pressing down, so that the effect of the lightly pressing down technique is improved; impurity elements which are separated and crystallized in the molten steel solidification process are reduced from the source through the control of molten steel inclusion, any equipment and process steps are not required to be added, and the requirements of high-quality steel types are met.
The chinese patent application No. 201911303968.0 discloses a method for controlling carbon segregation by refining converter steelmaking in LF furnace, followed by continuous casting, heating, water dephosphorization, air cooling, coil collection, PF wire, coil unloading and warehousing. Solves the problems that carbon segregation is one of the common internal quality defects of continuous casting billets, is difficult to eliminate in the subsequent rolling process and seriously affects the yield and the performance of products.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a method for reducing the center segregation and the porosity of a wear-resistant steel casting blank, and the method is used for reducing the center segregation and the porosity of the casting blank by controlling the production process parameters of a converter, refining and continuous casting.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention relates to a method for reducing center segregation and looseness of a wear-resistant steel casting blank, which comprises the following production process routes: LD, LF, VD, CC; adopting a bloom process to produce, wherein the section of a casting blank is 280mm multiplied by 380mm;
the carbon content of converter tapping is more than 0.08%, and the endpoint is controlled by aluminum deoxidation;
refining is combined with ladle condition and production time sequence, the temperature of an upper stage is controlled, and the superheat degree of molten steel is ensured to be 20-30 ℃; the VD deep vacuum time is ensured to be 10-15min, and the soft blowing time is more than or equal to 13min;
the continuous casting adopts constant pulling speed control, and the range is as follows: 0.6-0.7m/min; the control range of the immersion nozzle insertion depth is 110-130mm; adopting a protection casting technology to prevent secondary oxidation of molten steel; adopting a crystallizer for electromagnetic stirring, wherein the current is 300-600A, and the frequency is 1-3HZ; dynamic soft reduction is adopted, dynamic adjustment is carried out according to the drawing speed, the superheat degree and the like of continuous casting, and the reduction is 2-10mm;
and (5) checking sulphur mark, hot acid and segregation of the casting blank, and analyzing center segregation and looseness of the casting blank.
Further, the carbon content of the wear-resistant steel is 0.58-0.66%, and the manganese content is 0.65-0.85%; .
Further, the VD deep vacuum times were 13min.
Further, constant pull rate control was adopted, and the pull rate was 0.67m/min.
Further, the immersion nozzle insertion depth control range is 120mm.
Compared with the prior art, the invention has the beneficial technical effects that:
aiming at the characteristics of high carbon content, manganese content and the like of the wear-resistant steel, segregation and looseness are more easily formed in the center of a casting blank, the center segregation and looseness of the wear-resistant steel casting blank are reduced by controlling the production process parameters of a converter, refining and continuous casting, the internal quality of the casting blank is improved, and the rejection rate is reduced. The method has simple and effective control measures, high accuracy and wide application prospect.
Drawings
The invention is further described with reference to the following description of the drawings.
FIG. 1 is a graph showing carbon segregation index of an example cast slab;
fig. 2 shows manganese segregation index of the cast slab of the example.
Detailed Description
Example 1
A method of reducing center segregation and porosity in a wear resistant steel casting, comprising:
1. the production process route of the wear-resistant steel B3 is as follows: LD, LF, VD, CC; adopting a bloom process to produce, wherein the section of a casting blank is 280mm multiplied by 380mm; the carbon content of the three-furnace steel is 0.60%, 0.61%, and the manganese content is 0.72%, 0.70%, respectively.
2. The carbon content of the tapping of the converter is 0.09%, 0.10% and 0.09%, and the endpoint is controlled by aluminum deoxidization.
3. The VD deep vacuum time is 13mi n, and the soft blowing time is 15mi n, 15mi n and 16mi n. The superheat degree of the molten steel is 24 ℃, 24 ℃ and 29 ℃.
4. Continuous casting is controlled by adopting constant pulling speed, and the pulling speed is 0.67 m/min; the control range of the immersion nozzle insertion depth is 120mm; adopting a protection casting technology to prevent secondary oxidation of molten steel; adopting a crystallizer for electromagnetic stirring, wherein the current is 500A, and the frequency is 2HZ; dynamic soft reduction is adopted, and dynamic adjustment is carried out according to the drawing speed, the superheat degree and the like of continuous casting, wherein the reduction is 5mm.
5. The sulfur mark result, hot acid result and segregation result of the cast slab are shown in the following table and the lower graph. The sulfur mark result, the center segregation of the hot acid result, the center porosity and the shrinkage cavity of the casting blank are all 0 level and 0.5 level, and the quality of the casting blank is good; the highest carbon segregation index at 1/4 of the inner arc of the casting blank is 1.06, the highest manganese segregation index at the center of the casting blank is 1.02, and the whole carbon element and the manganese element are uniformly distributed.
TABLE 1 sulphur print results for cast billets of examples
TABLE 2 thermal acid results for cast billets of examples
The above embodiments are only illustrative of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art to the technical solutions of the present invention should fall within the protection scope defined by the claims of the present invention without departing from the design spirit of the present invention.
Claims (5)
1. A method for reducing center segregation and porosity of a wear-resistant steel casting blank, which is characterized by comprising the following steps: the production process route is as follows: LD, LF, VD, CC; adopting a bloom process to produce, wherein the section of a casting blank is 280mm multiplied by 380mm;
the carbon content of converter tapping is more than 0.08%, and the endpoint is controlled by aluminum deoxidation;
refining is combined with ladle condition and production time sequence, the temperature of an upper stage is controlled, and the superheat degree of molten steel is ensured to be 20-30 ℃; the VD deep vacuum time is ensured to be 10-15min, and the soft blowing time is more than or equal to 13min;
the continuous casting adopts constant pulling speed control, and the range is as follows: 0.6-0.7m/min; the control range of the immersion nozzle insertion depth is 110-130mm; adopting a protection casting technology to prevent secondary oxidation of molten steel; adopting a crystallizer for electromagnetic stirring, wherein the current is 300-600A, and the frequency is 1-3HZ; dynamic soft reduction is adopted, dynamic adjustment is carried out according to the drawing speed, the superheat degree and the like of continuous casting, and the reduction is 2-10mm;
and (5) checking sulphur mark, hot acid and segregation of the casting blank, and analyzing center segregation and looseness of the casting blank.
2. The method for reducing center segregation and porosity of a wear resistant steel casting according to claim 1, wherein: the carbon content of the wear-resistant steel is 0.58-0.66%, and the manganese content is 0.65-0.85%.
3. The method for reducing center segregation and porosity of a wear resistant steel casting according to claim 1, wherein: the VD deep vacuum time is 13min.
4. The method for reducing center segregation and porosity of a wear resistant steel casting according to claim 1, wherein: the continuous casting is controlled by adopting constant pulling speed, and the pulling speed is 0.67m/min.
5. The method for reducing center segregation and porosity of a wear resistant steel casting according to claim 1, wherein: the control range of the immersion nozzle insertion depth is 120mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310083689.8A CN116144879A (en) | 2023-02-08 | 2023-02-08 | Method for reducing center segregation and porosity of wear-resistant steel casting blank |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310083689.8A CN116144879A (en) | 2023-02-08 | 2023-02-08 | Method for reducing center segregation and porosity of wear-resistant steel casting blank |
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| CN116144879A true CN116144879A (en) | 2023-05-23 |
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| CN202310083689.8A Pending CN116144879A (en) | 2023-02-08 | 2023-02-08 | Method for reducing center segregation and porosity of wear-resistant steel casting blank |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116571707A (en) * | 2023-07-12 | 2023-08-11 | 江苏永钢集团有限公司 | Method for improving center shrinkage cavity quality of high-carbon steel continuous casting billet |
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2023
- 2023-02-08 CN CN202310083689.8A patent/CN116144879A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116571707A (en) * | 2023-07-12 | 2023-08-11 | 江苏永钢集团有限公司 | Method for improving center shrinkage cavity quality of high-carbon steel continuous casting billet |
| CN116571707B (en) * | 2023-07-12 | 2023-09-12 | 江苏永钢集团有限公司 | Method for improving center shrinkage cavity quality of high-carbon steel continuous casting billet |
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