CN114231827A - Control method for B-type inclusions of high-speed steel rail - Google Patents
Control method for B-type inclusions of high-speed steel rail 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
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
- C22C33/06—Making ferrous alloys by melting using master alloys
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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
- C21C7/0087—Treatment of slags covering the steel bath, e.g. for separating slag from the molten metal
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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
- C21C7/10—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
Abstract
The invention discloses a control method of B-type inclusions of high-speed steel rails, and belongs to the technical field of metallurgy. The specific control method comprises the following working procedures of molten iron desulfurization treatment, converter blowing, LF refining, RH vacuum treatment, bloom continuous casting and rolling: LF refining process, which adopts lime, fluorite and wollastonite to make white slag, adds deoxidizer to the slag surface to strengthen deoxidation, controls Al in the refining slag2O3The content is 20-25%, the binary alkalinity is 3.0-3.5, and the white slag retention time is 10-15 minutes. The method has the advantages that the B-type inclusions of the high-speed steel rail are effectively controlled without extra cost increase, the B-type inclusions of the high-speed steel rail can be controlled to be 0-0.5 level, the product quality is improved, technical support is provided for the production of the high-speed steel rail, and the method has wide application prospect.
Description
Technical Field
The invention relates to the technical field of metallurgy, in particular to a method for controlling B-type inclusions of high-speed steel rails.
Background
The development of high speed, heavy load and increased running density becomes a great trend of the current railway, the increase of the speed of the railway correspondingly increases the steel requirement of the steel rail. The traditional process mainly adopts the aluminum-free process to produce on the used raw materials, but because the alloy and the raw materials contain certain residual aluminum, the residual aluminum completely enters the molten steel and cannot be removed, and Al is formed2O3The inclusion causes the increase of B-type inclusion (alumina) in the high-speed rail steel, and when the content of the B-type inclusion in the high-speed rail exceeds the standard upper limit requirement, the B-type inclusion can only be forced to be changed into other low-requirement rail varieties, thereby not only influencing the normal production plan, but also increasing the production cost.
The common control measures of the inclusions of the high-speed steel rail are a control method of heavy rail steel inclusions with the publication number of CN201510427458.X, the grades of the inclusions of steel products can be guaranteed to be less than or equal to 2.0, and the method mainly controls the content of S in molten steel to further promote various inclusions to float upwards, but still cannot meet the standard that the grade of B-type inclusions of the high-speed steel rail is less than 1.0.
The patent method adopts measures such as reinforced deoxidation of a converter, refining to produce reducing slag, RH vacuum treatment, continuous casting protective casting and the like, although the fineness of the B-type inclusion can be controlled to be 0.5 grade or below, the deoxidation is carried out by adopting a mode of adding Al into other alloys in the converter tapping process, large-sized inclusions are easily produced, further flaw detection of finished products is not qualified, and the flaw detection requirement of a high-speed rail is extremely strict.
The invention discloses a method for reducing B-type inclusions in aluminum-free deoxidized steel with application number CN201811003313.7, which controls the end-point oxygen content of molten steel and the aluminum content in raw and auxiliary materials by a process to reduce the exceeding rate of the B-type inclusions in the steel, meets the standard requirements of partial steel types on the B-type inclusions to a certain extent, but cannot completely avoid Al in the raw and auxiliary materials and refractory materials from entering the molten steel to form the B-type inclusions.
Aiming at the problem, the invention produces plastic non-metallic inclusion by adding aluminum products to deoxidize molten steel in the refining process, and further makes the inclusion disperse in the rolling process, thereby avoiding the use of finished steel products influenced by the inclusion.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a method for controlling B-type inclusions in high-speed steel rails, wherein the grades of the coarse-system and fine-system B-type inclusions are below 0.5 grade, so that large-scale non-metallic inclusions formed by aluminum deoxidation in the converter tapping process are avoided, meanwhile, non-metallic inclusions containing aluminum and having strong plasticity are generated in the refining process, further, the non-metallic inclusions are distributed in a dispersed manner in the finished product rolling process, and the adverse effect of the B-type non-metallic inclusions on the on-line service performance of the high-speed steel rails is effectively avoided.
According to the traditional process requirements and thinking, the best method for controlling the B-type nonmetallic inclusion is to reduce the source of Al and put an end to the addition of Al as much as possible from the aspects of raw materials, refractory materials, alloys and the like. The invention develops a new method, and a certain amount of aluminum is added in the refining and slagging process to ensure that a certain amount of Al is kept in slag2O3Meanwhile, Al is utilized by improving the alkalinity of LF refining slag2O3And CaO, SiO2To produce plastic 2 CaO. Al2O3·SiO2After rolling with a large compression ratio, the inclusions are dispersed and distributed. In addition, with the increase of the alkalinity of LF top slag, SiO in the slag can be further reduced2The content of the total oxygen is controlled to be below 5.0ppm, the generation of large-scale inclusions is effectively reduced, the generation of fine inclusions is promoted, the NDT reported damage of finished steel rails is reduced, and the inspection qualification rate of B-type non-metallic inclusions of the finished steel rails is improved.
In order to solve the technical problems, the invention adopts the technical scheme that: high-speed steel rail BThe control method of the similar inclusion is a high-speed steel rail smelting process and comprises the working procedures of molten iron desulphurization treatment, converter blowing, LF refining, RH vacuum treatment, bloom continuous casting and rolling; in the LF refining process, white ash, fluorite and wollastonite are adopted to produce white slag, deoxidizing agent is added to the slag surface to strengthen deoxidation, and Al in the refining slag is controlled2O3The content is 20-25%, the binary alkalinity is 3.0-3.5, and the white slag retention time is 10-15 minutes.
Further, in the converter blowing process, after the desulfurized molten iron is smelted by the converter, aluminum particles and aluminum blocks are not added in the steel tapping alloying process, only any one or more of carbon powder, ferrosilicon, ferromanganese, silicon-manganese alloy and ferrovanadium is added for alloying, and silicon, calcium and barium are added for deoxidation according to different ranges of the final oxygen content of the molten steel of 100-800 ppm.
Further, in the RH vacuum treatment process, after the molten steel is subjected to RH vacuum treatment after LF refining, the soft argon blowing time is 5-10 minutes, and the argon flow is 50-110L/min during soft blowing, so that the liquid level of the molten steel is prevented from being exposed and oxidized, and any calcium treatment operation is cancelled.
Further, in the rolling process, the casting blank is rolled into finished steel rails with different fixed length by a rolling mill with a large compression ratio of 12-15: 1.
Further, in the LF refining process, SiO in the refining slag is obtained after LF refining is finished2The content is less than or equal to 25 percent, and the total oxygen content is less than or equal to 5.0 ppm.
In the bloom continuous casting process, molten steel is kept stand after RH vacuum treatment until reaching an upper casting platform, and is cast into a high-speed rail steel casting blank through a bloom continuous casting machine, wherein the continuous casting drawing speed is controlled to be 0.65-0.75 m/min, and the tundish superheat degree is controlled to be 20-40 ℃.
Further, in the converter blowing process, silicon, calcium and barium are added for deoxidation, and the addition amount of the silicon, calcium and barium is 1.0-2.0 kg/t steel; the deoxidizer added on the slag surface is any one or more of aluminum particles, aluminum powder, silicon carbide, calcium carbide and calcium silicate wire.
Furthermore, the grade of the B-type nonmetallic inclusions of the high-speed steel rail obtained by the control method is 0-0.5 grade.
Furthermore, the grade of the non-metallic inclusions in the B class of the high-speed steel rail obtained by the control method is more than 95% of grade 0 in batches.
Adopt above-mentioned technical scheme's beneficial effect to lie in: the method has the advantages that the B-type inclusions of the high-speed steel rail are effectively controlled without extra cost, the B-type inclusions of the high-speed steel rail can be controlled to be 0-0.5 level, more than 95% of the B-type inclusions of the high-speed steel rail are 0 level in batches, the product quality is improved, technical support is provided for the production of the high-speed steel rail, and the method has a wide application prospect.
Detailed Description
The present invention will be described in further detail with reference to specific examples.
Example 1
The method for smelting the high-speed steel rail with the steel grade of U71Mn and the furnace capacity of 120 tons comprises the following steps:
(1) after the desulfurized molten iron is smelted by the converter, no alloy such as aluminum particles, aluminum blocks and the like is added in the steel tapping alloying process, only carbon powder, ferrosilicon, ferromanganese and silicomanganese alloy are added for alloying, the oxygen content at the end point of the converter is 100ppm, and 1.0kg/t of silicon-calcium-barium is added for molten steel deoxidation.
(2) The LF refining adopts lime, fluorite and wollastonite to produce white slag, aluminum particles and silicon carbide are added on the slag surface to strengthen deoxidation, and Al in the refining slag is controlled2O3The content is 20 percent, and the binary alkalinity (CaO/SiO)2) At 3.0, the white slag retention time was 10 minutes. After refining, SiO in the slag2The content is 23 percent, and the total oxygen content is 4.0 ppm.
(3) After the LF refining, the molten steel is subjected to RH vacuum treatment, and then soft argon blowing time is 5 minutes, wherein the argon flow is 50L/min during soft blowing, so that the liquid level of the molten steel is prevented from being exposed and oxidized, and any form of calcium treatment operation is cancelled.
(4) And standing the molten steel after the soft blowing treatment until reaching an upper casting platform, and casting the molten steel into a high-speed rail steel casting blank through a bloom continuous casting machine with the section of 280mm multiplied by 380mm, wherein the continuous casting drawing speed is 0.65m/min, and the superheat degree of a tundish is 20 ℃.
(5) And rolling the cast high-speed rail steel blank into steel rails with different fixed lengths by a rolling ratio of 14: 1.
The high speed steel rail casting blank of the embodiment is rolled into 50kg/m, 60kg/m and 75kg/m steel rails, and the rough system and the fine system grades of B-type inclusions of finished high speed steel rails are tested and shown in Table 1.
Example 2
The method for smelting the high-speed steel rail with the steel grade of U75V and the furnace capacity of 130 tons comprises the following steps:
(1) the desulfurized molten iron is smelted by a converter, and then alloy such as aluminum particles, aluminum blocks and the like is not added in the steel tapping deoxidation alloying process, only carbon powder, ferrosilicon, ferromanganese, silicon-manganese alloy and ferrovanadium are added for deoxidation alloying, the end point oxygen content of the converter is 300ppm, and 1.5kg/t of silicon-calcium-barium is added for molten steel deoxidation.
(2) The LF refining adopts lime, fluorite and wollastonite to produce white slag, aluminum powder, silicon carbide and calcium silicate are added on the slag surface to strengthen deoxidation, and Al in the refining slag is controlled2O3Content of 22%, and binary basicity (CaO/SiO)2) At 3.2, the white slag retention time was 12 minutes. After refining, SiO in the slag2Content 22% and total oxygen content 4.5 ppm.
(3) After the LF refining, the molten steel is subjected to RH vacuum treatment, the soft argon blowing time is 6 minutes, the argon flow during the soft blowing is 60L/min, the liquid level of the molten steel is prevented from being exposed and oxidized, and any form of calcium treatment operation is cancelled
(4) And standing the molten steel after the soft blowing treatment until the molten steel reaches an upper casting platform, and casting the molten steel into a high-speed rail steel casting blank through a bloom continuous casting machine with the section of 280mm multiplied by 380 mm. Wherein the continuous casting drawing speed is 0.65m/min, and the tundish superheat degree is controlled to be 30 ℃.
(5) And rolling the cast high-speed rail steel blank into steel rails with different fixed lengths by a rolling ratio of 14: 1.
The high speed steel rail casting blank of the embodiment is rolled into 50kg/m, 60kg/m and 75kg/m steel rails, and the rough system and the fine system grades of B-type inclusions of finished high speed steel rails are tested and shown in Table 1.
Example 3
The method for smelting the high-speed steel rail with the steel grade of U71Mn and the furnace capacity of 130 tons comprises the following steps:
(1) the desulfurized molten iron is smelted by a converter, and then alloy such as aluminum particles, aluminum blocks and the like is not added in the steel tapping deoxidation alloying process, only carbon powder, ferrosilicon, ferromanganese, silicon-manganese alloy and ferrovanadium are added for deoxidation alloying, the end point oxygen content of the converter is 400ppm, and 1.6kg/t of silicon-calcium-barium is added for molten steel deoxidation.
(2) The LF refining adopts lime, fluorite and wollastonite to produce white slag, aluminum powder, silicon carbide and calcium carbide are added on the slag surface to strengthen deoxidation, and Al in the refining slag is controlled2O3The content is 23 percent, and the binary alkalinity (CaO/SiO)2) At 3.3, the white slag retention time was 13 minutes. After refining, SiO in the slag2Content 22% and total oxygen content 4.3 ppm.
(3) After the LF refining, the molten steel is subjected to RH vacuum treatment, the soft argon blowing time is 7 minutes, the argon flow during the soft blowing is 70L/min, the liquid level of the molten steel is prevented from being exposed and oxidized, and any form of calcium treatment operation is cancelled.
(4) And standing the molten steel after the soft blowing treatment until reaching an upper casting platform, and casting the molten steel into a high-speed rail steel casting blank through a bloom continuous casting machine with the section of 280mm multiplied by 325mm, wherein the continuous casting drawing speed is 0.65m/min, and the superheat degree of a tundish is controlled to be 40 ℃.
(5) And rolling the cast high-speed rail steel blank into steel rails with different fixed lengths by a rolling ratio of 14: 1.
The high speed steel rail casting blank of the embodiment is rolled into 50kg/m, 60kg/m and 75kg/m steel rails, and the rough system and the fine system grades of B-type inclusions of finished high speed steel rails are tested and shown in Table 1.
Example 4
The smelting steel type is 900A's high speed rail, and the furnace capacity is 120 tons, includes the following steps:
(1) the desulfurized molten iron is smelted by a converter, and then alloy such as aluminum particles, aluminum blocks and the like is not added in the steel tapping deoxidation alloying process, only carbon powder, ferrosilicon, ferromanganese, silicon-manganese alloy and ferrovanadium are added for deoxidation alloying, the end point oxygen content of the converter is 600ppm, and 1.7kg/t of silicon-calcium-barium is added for molten steel deoxidation.
(2) The LF refining adopts lime, fluorite and wollastonite to produce white slag, aluminum powder and calcium carbide are added on the slag surface to strengthen deoxidation, and Al in the refining slag is controlled2O3The content is 24 percent, and the binary alkalinity (CaO/SiO)2) At 3.5, the white slag retention time was 15 minutes. After refining, SiO in the slag2The content is 24 percent, and the total oxygen content is 4.6 ppm.
(3) After the LF refining, the molten steel is subjected to RH vacuum treatment, the soft argon blowing time is 8 minutes, the argon flow during the soft blowing is 80L/min, the liquid level of the molten steel is prevented from being exposed and oxidized, and any form of calcium treatment operation is cancelled.
(4) And standing the molten steel after soft blowing until reaching an upper casting platform, and casting the molten steel into a high-speed steel rail casting blank through a bloom continuous casting machine with the section of 280mm multiplied by 380mm, wherein the continuous casting drawing speed is 0.70m/min, and the superheat degree of a tundish is controlled at 20 ℃.
(5) And rolling the cast high-speed rail steel blank into steel rails with different fixed lengths by a rolling ratio of 15: 1.
The high speed steel rail casting blank of the embodiment is rolled into 50kg/m, 60kg/m and 75kg/m steel rails, and the rough system and the fine system grades of B-type inclusions of finished high speed steel rails are tested and shown in Table 1.
Example 5
The smelting steel type is R260 high-speed steel rail, 150 tons of furnace capacity, including the following steps:
(1) the desulfurized molten iron is smelted by a converter, and then alloy such as aluminum particles, aluminum blocks and the like is not added in the steel tapping deoxidation alloying process, only carbon powder, ferrosilicon, ferromanganese, silicon-manganese alloy and ferrovanadium are added for deoxidation alloying, the end point oxygen content of the converter is 700ppm, and 1.8kg/t of silicon-calcium-barium is added for molten steel deoxidation.
(2) The LF refining adopts lime, fluorite and wollastonite to produce white slag, aluminum powder, silicon carbide and calcium silicate are added on the slag surface to strengthen deoxidation, and Al in the refining slag is controlled2O3Content of 25%, binary basicity (CaO/SiO)2) At 3.5, the white slag retention time was 15 minutes. After refining, SiO in the slag225% of the total oxygen content and 5.0ppm of the total oxygen content.
(3) After the LF refining, the molten steel is subjected to RH vacuum treatment, the soft argon blowing time is 9 minutes, the argon flow during the soft blowing is 100L/min, the liquid level of the molten steel is prevented from being exposed and oxidized, and any form of calcium treatment operation is cancelled.
(4) And standing the molten steel after soft blowing until reaching an upper casting platform, and casting the molten steel into a high-speed steel rail casting blank through a bloom continuous casting machine with the section of 280mm multiplied by 380mm, wherein the continuous casting drawing speed is 0.70m/min, and the superheat degree of a tundish is controlled at 30 ℃.
(5) And rolling the cast high-speed rail steel blank into steel rails with different fixed lengths by a rolling ratio of 13: 1.
The high speed steel rail casting blank of the embodiment is rolled into 50kg/m, 60kg/m and 75kg/m steel rails, and the rough system and the fine system grades of B-type inclusions of finished high speed steel rails are tested and shown in Table 1.
Example 6
The smelting steel type is the high speed rail of R260Mn, and 120 tons of furnace capacity include the following steps:
(1) the desulfurized molten iron is smelted by a converter, and then alloy such as aluminum particles, aluminum blocks and the like is not added in the steel tapping deoxidation alloying process, only carbon powder, ferrosilicon, ferromanganese, silicon-manganese alloy and ferrovanadium are added for deoxidation alloying, the end point oxygen content of the converter is 800ppm, and 2.0kg/t of silicon-calcium-barium is added for molten steel deoxidation.
(2) The LF refining adopts slag materials such as lime, fluorite and the like to produce white slag, aluminum powder and calcium silicate wires are added on the slag surface to strengthen deoxidation, and Al in the refining slag is controlled2O3The content is 20 percent, and the binary alkalinity (CaO/SiO)2) At 3.5, the white slag retention time was 15 minutes. After refining, SiO in the slag2The content was 21% and the total oxygen content was 4.5 ppm.
(3) After the LF refining, the molten steel is subjected to RH vacuum treatment, and then soft argon blowing time is 10 minutes, wherein the argon flow during soft blowing is 110L/min, so that the liquid level of the molten steel is prevented from being exposed and oxidized, and any form of calcium treatment operation is cancelled.
(4) And standing the molten steel after soft blowing until reaching an upper casting platform, and casting the molten steel into a high-speed steel rail casting blank through a bloom continuous casting machine with the section of 280mm multiplied by 380mm, wherein the continuous casting drawing speed is 0.75m/min, and the superheat degree of a tundish is controlled at 40 ℃.
(5) And rolling the cast high-speed rail steel blank into steel rails with different fixed lengths by a rolling ratio of 12: 1.
The high speed steel rail casting blank of the embodiment is rolled into 50kg/m, 60kg/m and 75kg/m steel rails, and the rough system and the fine system grades of B-type inclusions of finished high speed steel rails are tested and shown in Table 1.
TABLE 1 examples 1-6 Steel Rail products of class B inclusions in coarse and fine grades
As can be seen from Table 1, the high-speed steel rails of the corresponding batches of examples 1 to 6 are rolled into steel rails of 50kg/m, 60kg/m and 75kg/m respectively, and the rough grade and the fine grade of the B-type inclusions of the finished steel rails of the high-speed steel rails are tested to be 0-0.5 grade, wherein more than 95 percent of the batches are 0 grade, and the requirements of the standards on the B-type inclusions are completely met.
Although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: modifications and equivalents may be made thereto without departing from the spirit and scope of the invention and it is intended to cover in the claims the invention as defined in the appended claims.
Claims (9)
1. A control method of B-type inclusions of high-speed steel rails is characterized by comprising the working procedures of molten iron desulphurization treatment, converter blowing, LF refining, RH vacuum treatment, bloom continuous casting and rolling;
in the LF refining process, white ash, fluorite and wollastonite are adopted to produce white slag, deoxidizing agent is added to the slag surface to strengthen deoxidation, and Al in the refining slag is controlled2O3The content is 20-25%, the binary alkalinity is 3.0-3.5, and the white slag retention time is 10-15 minutes.
2. The method for controlling the B-type inclusions in the high-speed steel rails according to claim 1, wherein in the converter blowing process, after the desulfurized molten iron is smelted by the converter, aluminum particles and aluminum blocks are not added in the steel tapping alloying process, only any one or more of carbon powder, ferrosilicon, ferromanganese, silicon-manganese alloy and ferrovanadium is added for alloying, and silicon-calcium-barium is added for deoxidation according to different ranges of 100-800 ppm of the final oxygen content of the molten iron.
3. The method for controlling B-type inclusions in high-speed steel rails according to claim 1, wherein in the RH vacuum treatment process, after the molten steel is subjected to RH vacuum treatment after LF refining, the soft argon blowing time is 5-10 minutes, the argon flow during soft blowing is 50-110L/min, the liquid level of the molten steel is prevented from being exposed and oxidized, and any calcium treatment operation is omitted.
4. The method for controlling B-type inclusions in high-speed steel rails according to claim 1, wherein in the bloom continuous casting process, the molten steel after RH vacuum treatment is kept still until reaching an upper casting platform, and is cast into a high-speed rail steel casting blank through a bloom continuous casting machine, wherein the continuous casting drawing speed is controlled to be 0.65-0.75 m/min, and the degree of superheat of a tundish is controlled to be 20-40 ℃.
5. The method for controlling the B-type inclusions in the high-speed steel rail as claimed in claim 1, wherein in the rolling step, the cast slab is rolled into finished steel rails with different lengths by a rolling mill with a large compression ratio of 12-15: 1.
6. The method for controlling B-type inclusions in high-speed steel rails according to any one of claims 1 to 5, wherein in the LF refining step, SiO in refining slag is contained in the LF refining slag after the LF refining is completed2The content is less than or equal to 25 percent, and the total oxygen content is less than or equal to 5.0 ppm.
7. The method for controlling B-type inclusions in high-speed steel rails according to any one of claims 1 to 5, wherein silicon, calcium and barium are added for deoxidation in the converter blowing process, and the addition amount of the silicon, calcium and barium is 1.0 to 2.0kg/t steel; the deoxidizer added on the slag surface is any one or more of aluminum particles, aluminum powder, silicon carbide, calcium carbide and calcium silicate wire.
8. The method for controlling B-type inclusions in high-speed rails according to any one of claims 1 to 5, wherein the grade of the B-type non-metallic inclusions in the high-speed rails obtained by the control method is 0 to 0.5.
9. The method for controlling the B-type inclusions of the high-speed steel rail according to any one of claims 1 to 5, wherein the grade of the B-type non-metallic inclusions of the high-speed steel rail obtained by the control method is 0 grade in more than 95% of batches.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114959178A (en) * | 2022-05-18 | 2022-08-30 | 广西盛隆冶金有限公司 | Deoxidizer, preparation method of steel, steel and application |
| CN115058557A (en) * | 2022-06-17 | 2022-09-16 | 山东钢铁股份有限公司 | Production method of small-size inclusion H-shaped steel for ocean engineering |
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| JP2001026811A (en) * | 1999-07-09 | 2001-01-30 | Nippon Yakin Kogyo Co Ltd | Si ALLOY IRON USED FOR REFINING OF STAINLESS STEEL AND METHOD FOR REFINING STAINLESS STEEL |
| CN105132631A (en) * | 2015-08-28 | 2015-12-09 | 河北钢铁股份有限公司邯郸分公司 | Method for controlling Ds type inclusions in heavy-rail steel |
| JP2018141221A (en) * | 2017-02-28 | 2018-09-13 | Ｊｆｅスチール株式会社 | Production method of high cleanliness steel |
| CN109161785A (en) * | 2018-08-30 | 2019-01-08 | 武汉钢铁有限公司 | The method for reducing B type impurity in al-free deoxidation steel |
| CN112593136A (en) * | 2020-11-04 | 2021-04-02 | 邯郸钢铁集团有限责任公司 | Smelting method for reducing formation of large inclusions in steel rail for high-speed railway |
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| CN114959178A (en) * | 2022-05-18 | 2022-08-30 | 广西盛隆冶金有限公司 | Deoxidizer, preparation method of steel, steel and application |
| CN115058557A (en) * | 2022-06-17 | 2022-09-16 | 山东钢铁股份有限公司 | Production method of small-size inclusion H-shaped steel for ocean engineering |
| CN115058557B (en) * | 2022-06-17 | 2024-04-05 | 山东钢铁股份有限公司 | Production method of small-size inclusion H-shaped steel for ocean engineering |
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