CN115301907A - Novel cold heading steel covering slag - Google Patents
Novel cold heading steel covering slag Download PDFInfo
- Publication number
- CN115301907A CN115301907A CN202210982640.1A CN202210982640A CN115301907A CN 115301907 A CN115301907 A CN 115301907A CN 202210982640 A CN202210982640 A CN 202210982640A CN 115301907 A CN115301907 A CN 115301907A
- Authority
- CN
- China
- Prior art keywords
- percent
- slag
- covering slag
- cold heading
- heading steel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000002893 slag Substances 0.000 title claims abstract description 98
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 60
- 239000010959 steel Substances 0.000 title claims abstract description 60
- 238000005266 casting Methods 0.000 claims abstract description 52
- 239000000843 powder Substances 0.000 claims abstract description 38
- 238000002844 melting Methods 0.000 claims abstract description 21
- 230000008018 melting Effects 0.000 claims abstract description 21
- 238000009749 continuous casting Methods 0.000 claims abstract description 16
- 229910000604 Ferrochrome Inorganic materials 0.000 claims abstract description 4
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 28
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 22
- 230000004907 flux Effects 0.000 claims description 21
- JWCPKKUXENYVPL-UHFFFAOYSA-N [Mg+2].[O-][Cr]([O-])=O Chemical compound [Mg+2].[O-][Cr]([O-])=O JWCPKKUXENYVPL-UHFFFAOYSA-N 0.000 claims description 18
- 238000010273 cold forging Methods 0.000 claims description 18
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 16
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims description 16
- 239000010436 fluorite Substances 0.000 claims description 16
- 229910001570 bauxite Inorganic materials 0.000 claims description 15
- 229910021538 borax Inorganic materials 0.000 claims description 15
- 239000004328 sodium tetraborate Substances 0.000 claims description 15
- 235000010339 sodium tetraborate Nutrition 0.000 claims description 15
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 14
- 239000010456 wollastonite Substances 0.000 claims description 14
- 229910052882 wollastonite Inorganic materials 0.000 claims description 14
- 235000019738 Limestone Nutrition 0.000 claims description 13
- 239000006028 limestone Substances 0.000 claims description 13
- NUJOXMJBOLGQSY-UHFFFAOYSA-N manganese dioxide Inorganic materials O=[Mn]=O NUJOXMJBOLGQSY-UHFFFAOYSA-N 0.000 claims description 13
- 230000001681 protective effect Effects 0.000 claims description 12
- 239000000395 magnesium oxide Substances 0.000 claims description 11
- 238000009736 wetting Methods 0.000 claims description 7
- 229910020105 MgCr2O4 Inorganic materials 0.000 claims description 4
- 229910052782 aluminium Inorganic materials 0.000 claims description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 4
- HEQBUZNAOJCRSL-UHFFFAOYSA-N iron(ii) chromite Chemical compound [O-2].[O-2].[O-2].[Cr+3].[Fe+3] HEQBUZNAOJCRSL-UHFFFAOYSA-N 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 11
- 230000005855 radiation Effects 0.000 abstract description 10
- 230000001050 lubricating effect Effects 0.000 abstract description 9
- 230000008569 process Effects 0.000 abstract description 8
- 239000002994 raw material Substances 0.000 abstract description 8
- 230000008901 benefit Effects 0.000 abstract description 6
- 238000012546 transfer Methods 0.000 abstract description 6
- 238000010521 absorption reaction Methods 0.000 abstract description 5
- 230000001276 controlling effect Effects 0.000 abstract description 5
- 230000001105 regulatory effect Effects 0.000 abstract description 3
- 238000009851 ferrous metallurgy Methods 0.000 abstract description 2
- 230000002401 inhibitory effect Effects 0.000 abstract description 2
- 229910052723 transition metal Inorganic materials 0.000 abstract description 2
- 150000003624 transition metals Chemical class 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 15
- 230000002829 reductive effect Effects 0.000 description 14
- 238000002425 crystallisation Methods 0.000 description 7
- 230000008025 crystallization Effects 0.000 description 7
- 230000007547 defect Effects 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 229910000954 Medium-carbon steel Inorganic materials 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 230000000704 physical effect Effects 0.000 description 5
- 238000005421 electrostatic potential Methods 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 229910001566 austenite Inorganic materials 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000010439 graphite Substances 0.000 description 3
- 229910002804 graphite Inorganic materials 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 239000011777 magnesium Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000012071 phase Substances 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 2
- 229910004298 SiO 2 Inorganic materials 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 2
- 125000002091 cationic group Chemical group 0.000 description 2
- 150000001768 cations Chemical class 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000005461 lubrication Methods 0.000 description 2
- 229910052755 nonmetal Inorganic materials 0.000 description 2
- 238000010791 quenching Methods 0.000 description 2
- 230000000171 quenching effect Effects 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910000677 High-carbon steel Inorganic materials 0.000 description 1
- VNYSVKIBBZAPBN-UHFFFAOYSA-N [Mg].[Cr].[Fe] Chemical compound [Mg].[Cr].[Fe] VNYSVKIBBZAPBN-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000003575 carbonaceous material Substances 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 229910052960 marcasite Inorganic materials 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 230000005499 meniscus Effects 0.000 description 1
- QMQXDJATSGGYDR-UHFFFAOYSA-N methylidyneiron Chemical compound [C].[Fe] QMQXDJATSGGYDR-UHFFFAOYSA-N 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000010587 phase diagram Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- NIFIFKQPDTWWGU-UHFFFAOYSA-N pyrite Chemical compound [Fe+2].[S-][S-] NIFIFKQPDTWWGU-UHFFFAOYSA-N 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000007920 subcutaneous administration Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 229910000314 transition metal oxide Inorganic materials 0.000 description 1
- 239000012856 weighed raw material Substances 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Classifications
-
- 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
- B22D11/111—Treating the molten metal by using protecting powders
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
Abstract
The invention relates to novel cold heading steel casting powder, and belongs to the field of ferrous metallurgy continuous casting. The invention tries to use a proper amount of ferrochrome ore as one of the raw materials of the covering slag for the first time, thereby not only playing a good role in regulating and controlling the heat control performance, but also reducing the cost. By increasing the content of the transition metal Cr 3+ And Mn 2+ The content of the (A) in the slag film improves the radiation absorption coefficient of the slag film, reduces the heat radiation capability of infrared rays, and further achieves the purpose of improving the heat control capability of the mold powder. The cold heading steel casting powder developed by the invention has proper melting point and viscosity, high steel slag interface stability, strong slag entrapment inhibiting capability and good lubricating property when in use, can well control heat transfer, ensures the smooth proceeding of the continuous casting process of cold heading steel, can effectively prevent the generation of longitudinal cracks, and has good social benefit and economic benefit.
Description
Technical Field
The invention relates to novel cold heading steel casting powder, and belongs to the field of ferrous metallurgy continuous casting.
Background
The cold heading steel is widely applied to manufacturing fasteners such as high-strength screws, nuts and the like. The carbon content of the cold forging steel is between 0.39 and 0.42 percent, the cold forging steel belongs to medium carbon steel, the solid-liquid phase zone of the cold forging steel is 1441 to 1495 ℃, and the peritectic reaction (L + delta → gamma) of the cold forging steel can occur at 1479 to 1495 ℃ according to an iron-carbon phase diagram; because the content of Cr in the cold forging steel is high, cr and Fe can form a continuous solid solution, and Cr and Fe are mutually substituted to reduce the stability of austenite, thereby reducing the austenite phase region. In addition, medium and high carbon steel is closely contacted with the wall of a crystallizer due to the characteristics of steel grades, and the phenomenon of adhesion between a copper mold and a solidified blank shell is easy to occur, so that a longitudinal large crack defect often occurs in the production of cold forging steel, protective slag is often accompanied in the crack, the protective slag plays an important role in the continuous casting process, and the physical and chemical properties of the protective slag are closely related to the quality of a casting blank. When the viscosity of the casting powder is too high, the amount of the casting powder flowing between the crystallizer and the solidified blank shell is reduced, and then a liquid slag layer is too thin, so that a casting blank cannot be sufficiently lubricated, and the casting blank has turbulence and distortion of oscillation marks and induces subcutaneous cracks. In order to solve the problems that an initial blank shell at a meniscus of a crystallizer is thin, the high-temperature plasticity and strength of the initial blank shell are low, the heat flow of the crystallizer is low, the lubrication of the covering slag is poor and the like, an improved covering slag is required to be sought.
The application publication No. CN114101614A discloses crystallizer covering slag for cold forging steel continuous casting and a preparation method thereof, aiming at the problems that corner unfilled corners on the surface of a casting blank, non-metal inclusions and other quality defects are easy to occur in the continuous casting process of cold forging steel, na elements in the non-metal inclusions easy to be rolled are reduced, and meanwhile, the viscosity of the covering slag is improved, so that a sufficient liquid slag layer is ensured, and the lubricating effect is enhanced, thereby reducing the rolled slag. The alkalinity of the casting powder is 0.65-1.05, the viscosity at 1300 ℃ is 1.16-1.45 Pa.s, the melting point is 1150-1178 ℃, and the casting powder cannot fill the gap between a solidified blank shell and a crystallizer, so that the lubricating effect is poor, the problem of longitudinal crack on the surface of a casting blank is not well solved, and the risk of bonding steel leakage possibly exists.
Application publication No. CN109550912B discloses a low-reactivity mold flux for aluminum-containing medium carbon steel; the invention selects the protective slag with low reactivity and more stable slag physical property, and aims to solve the problem of slag steel reaction from the source; the casting powder is BaO/Al 2 O 3 The ratio is controlled within 1.2-1.8, the viscosity at 1300 ℃ is 0.05-0.12 Pa.s, and the melting point is 1140-1200 ℃. Although the casting powder ensures the lubricating effect of the slag on the casting blank, the BaO-Al 2 O 3 The crystallization property of the protective slag is weak, the heat control effect is poor, and for medium carbon steel such as cold heading steel, additional stress can be generated on an initial solidified blank shell due to the problem of unmatched thermal shrinkage coefficient when the medium carbon steel undergoes peritectic phase transition from delta-Fe to gamma-Fe, so that the phase transition shrinkage is caused to generate cracks;
cr is rarely added into industrial mold flux, and related research shows that Cr (Cr) 2 O 3 ) As the transition metal oxide, the radiation absorption coefficient of the slag film can be improved, the heat radiation capability of infrared rays can be reduced, the heat control capability of the protective slag can be improved, and the total heat transfer rate is reduced along with the increase of Cr. Adding Cr 2 O 3 For the cold forging steel casting powder, the defect of poor heat control effect is just filled. The magnesium chromite in China has the advantages of large reserves, wide sources, easy acquisition and low price. The magnesium chromite is added into the covering slag to simultaneously improve the cationic Cr with larger electrostatic potential 3+ And Mg 2+ The surface tension of the covering slag is increased, so that the problem that the interface tension between the original cold forging steel and the covering slag for continuous casting is too small is solved, and the slag inclusion on the surface of the casting blank is effectively reduced.
Besides being a great innovation point by adding a proper amount of magnesium chromite, the invention also makes overall adjustment on the performance of the casting powder: the alkalinity of the covering slag is improved to increase the crystallization rate, the content of bauxite is reduced, the content of borax and fluorite is increased to reduce the melting point and the viscosity, the sodium carbonate is reduced in a proper amount, the interface stability of the steel slag is improved, and the comprehensive regulation and control on the performance of the covering slag are realized by adjusting.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide novel cold heading steel casting powder which is innovatively provided aiming at the problems of overhigh viscosity, poor heat control capability, poor lubricating effect and the like of the original cold heading steel casting powder. The invention has stable components and performance, and the invention tries to use a proper amount of ferrochrome ore as one of the raw materials of the covering slag for the first time, thereby not only playing a good role in regulating and controlling heat control performance, but also reducing the cost. Innovative raw materials of the covering slag, namely the magnesium chromite and the pyrolusite are used for improving Cr 3+ And Mn 2+ The content of Cr can improve the radiation absorption coefficient of the slag film, reduce the cutoff wavelength of infrared rays, reduce the heat radiation capability of the infrared rays and improve the heat control capability of the covering slag 3+ And Mn 2+ The casting powder belongs to cations with larger electrostatic potential, and the surface tension of the casting powder can be increased, so that the casting powder is beneficial to reducing the slag inclusion rate of the surface of a casting blank; the covering slag improves the alkalinity on the basis of the original covering slag, reduces the bauxite proportion, increases the contents of borax and fluorite so as to reduce the melting point and the viscosity, properly reduces sodium carbonate, improves the interface stability of steel slag and ensures the smooth continuous casting.
In order to achieve the purpose, the technical scheme of the invention is as follows:
the invention relates to novel cold heading steel covering slag which comprises the following components in percentage by mass:
30-45% of wollastonite, 5-12% of limestone, 10-18% of bauxite, 1-6% of pyrolusite, 1-8% of fluorite, 0-5% of magnesia, 4-13% of sodium carbonate, 1-6% of borax, 9-20% of carbon powder and 1-4% of ferrochrome.
The preferable addition amount of the magnesium chromite in the invention is 1.5-4%, the mold powder in the range can well improve the heat transfer control capability under the condition of well controlling the crystallization temperature and the melting temperature, the content of the magnesium chromite is not too high, otherwise, the melting temperature and the crystallization temperature are increased, the lubricating property of the mold powder is reduced, and the casting blank can not be fully lubricated.
As a preferable scheme, the novel cold forging steel covering slag comprises the following components in percentage by mass:
30-43% of wollastonite, 5.50-12% of limestone, 11-18% of bauxite, 1-5% of pyrolusite, 2-7% of fluorite, 0-3% of magnesia, 4-12% of sodium carbonate, 1-5% of borax, 10-20% of carbon powder and 1.50-4% of magnesium chromite.
As a further preferable scheme, the novel cold heading steel covering slag comprises the following components in percentage by mass:
36.38-42.98% of wollastonite, 8.03-11.18% of limestone, 12.34-17.18% of bauxite, 1.42-4.78% of pyrolusite, 2.81-6.88% of fluorite, 0.10-2.16% of magnesia, 5.12-11.33% of sodium carbonate, 1.16-4.58% of borax, 10.33-16.38% of carbon powder and 1.62-3.48% of ferrochromite.
As a further preferable scheme, the novel cold heading steel covering slag comprises the following components in percentage by mass:
38.98-41.83 percent of wollastonite, 9.63-10.28 percent of limestone, 14.34-15.68 percent of bauxite, 2.12-3.18 percent of pyrolusite, 5.81-6.88 percent of fluorite, 0.10-0.21 percent of magnesia, 6.02-9.03 percent of sodium carbonate, 1.16-2.58 percent of borax, 11.3-15.18 percent of carbon powder and 2.02-3.18 percent of magnesium chromite.
As a further preferable scheme, the novel cold heading steel covering slag comprises the following components in percentage by mass:
40.94% of wollastonite, 10.19% of limestone, 14.50% of bauxite, 2.50% of pyrolusite, 6.64% of fluorite, 0.10% of magnesia, 6.89% of sodium carbonate, 1.90% of borax, 13.30% of carbon powder and 3.03% of magnesiochromite.
The content of MgCr2O4 in the used magnesium chromite is 80-98%.
The novel cold heading steel covering slag has the melting temperature of 1027-1131 ℃.
The novel cold heading steel casting powder has the viscosity of 0.221-0.422 Pa.s at 1300 ℃.
The novel cold heading steel casting powder has a wetting angle of 36.62-45.6 degrees.
The invention relates to novel cold forging steel covering slag, which comprises the following components in percentage by mass: 40.94 percent of wollastonite, 10.19 percent of limestone, 14.50 percent of bauxite, 2.50 percent of pyrolusite, 6.64 percent of fluorite, 0.10 percent of magnesia, 6.89 percent of sodium carbonate, 1.90 percent of borax, 13.30 percent of carbon powder and 3.03 percent of magnesiochromite.
When the content of MgCr2O4 in the magnesium chromite is 84-86%, the melting temperature of the protective slag is 1123-1125 ℃; the viscosity of the covering slag is 0.37-0.38 Pa.s at 1300 ℃; the wetting angle of the covering slag is 45.4-45.6 degrees.
The invention relates to application of novel cold heading steel casting powder, which is used for continuous casting of cold heading steel; in the cold forging steel, the content of Mn is 0.50wt% -0.88 wt%, the content of Cr is 0.90wt% -1.28 wt%, and the content of aluminum is 0.01wt% -0.6 wt%.
The continuous casting of the cold heading steel in the present invention includes continuous casting using an existing process.
The invention takes the traditional wollastonite and limestone as the main base materials of the protective slag, and is the traditional CaO-SiO 2 Is a protective slag and has good chemical component stability.
The borax and fluorite in the invention are used as additives of the covering slag and have the function of controlling the melting temperature.
The magnesium chromite and pyrolusite are used as coloring agents, have the effect of reducing radiation heat transfer, and simultaneously can improve the cationic Cr with larger electrostatic potential 3+ And Mg 2+ The content of the casting powder can improve the surface tension of the casting powder, thereby achieving the purposes of improving the surface quality of a casting blank and reducing the defects of dents, cracks and the like.
The C is used as a framework, the melting speed of the covering slag can be adjusted, and the carbon powder content is controlled within the range of 13-20%.
The invention has the advantages that:
1) The cold forging steel covering slag is prepared by firstly innovatively selecting magnesium chromite as a raw material of the covering slag and Cr 2 O 3 The radiation absorption coefficient of the slag film is improved, the heat control capability of the casting powder is improved, the problem of slag inclusion on the surface of a casting blank caused by the excessively small wetting angle and the poor heat control effect of the original cold heading steel casting powder is well solved, a good regulation and control effect is achieved on the heat control performance, and the cost is reduced. The magnesium chromite can simultaneously improve the cation Cr with larger electrostatic potential 3+ And Mg 2+ The content of (3) can improve the surface tension of the casting powder, improve the surface quality of a casting blank and reduce the defects of depression, cracks and the like. The invention has obvious advantages and wide application prospect, and can provide reliable academic and theoretical support for academic scientific research and production practice.
2) The cold heading steel casting powder belongs to the traditional CaO-SiO 2 The protective slag is prepared by the method, the slag steel reaction does not occur, the component stability is high compared with the traditional cold forging steel protective slag, the problem of non-uniform slag infiltration is solved, the physical and chemical properties are stable, and the casting blank quality is stable. Can provide reliable and stable academic and theoretical support for academic scientific research and production practice. Especially provides necessary conditions for continuous industrial application.
3) The cold forging steel casting powder has low melting point and viscosity, can form a stable liquid layer, well lubricate a casting blank, control heat and ensure the smooth continuous casting.
In a word, the invention tries to use a proper amount of the magnesium-chromium-iron ore as one of the raw materials of the covering slag for the first time, plays a good role in regulating and controlling the heat control performance and reduces the cost. By increasing the amount of the transition metal Cr 3+ And Mn 2+ The content of the (B) is used for improving the radiation absorption coefficient of the slag film and reducing the heat radiation capability of infrared rays, thereby achieving the purpose of improving the heat control capability of the covering slag. In addition, the bauxite content is reduced, the borax content and the fluorite content are increased to reduce the melting point and the viscosity, the sodium carbonate content is properly reduced, the interface stability of the steel slag is improved, and slag entrapment is inhibited. The novel cold heading steel casting powder has good lubricating property, can well control heat transfer, ensures the smooth proceeding of the cold heading steel continuous casting process, can effectively prevent the generation of longitudinal cracks, and has good social benefitAnd economic benefits.
The specific implementation mode is as follows:
the invention is further illustrated by the following examples, which are intended to be illustrative only and are not intended to be in any way limiting.
The melting temperature and the viscosity of 1300 ℃ of the casting powder are respectively measured by metallurgical industry standards YB/T186 and YB/T185. The crystallization temperature is measured by a hot wire method commonly used in the industry. In the testing process, firstly, the raw materials of the casting powder are weighed and mixed according to target components, then, a medium-frequency induction furnace is adopted for melting to ensure that the components are uniform, then, the molten slag is poured into water for quenching to obtain a glassy state casting powder block, and finally, the block casting powder is milled into powder by the casting powder for carrying out hot wire experiment. In the process of measuring the crystallization temperature of the covering slag by a hot wire method, firstly, a thermocouple carrying the covering slag is heated to 1500 ℃, the temperature is reduced at a cooling rate of 30 ℃/s after the temperature is kept for 3 minutes, the time of crystal precipitation in the covering slag is observed and recorded by a camera connected to an optical microscope, and then the temperature of the covering slag collected by a computer is searched according to the time, so that the crystallization temperature of the covering slag is accurately obtained.
The preparation process comprises the following steps: 1) Weighing industrial raw materials such as limestone, wollastonite, bauxite, fluorite and the like according to the component content of the covering slag; mixing the weighed raw materials, and mechanically stirring to uniformly mix the components; 2) Pouring the mixed sample into a graphite crucible, putting the graphite crucible and the graphite crucible into a medium-frequency induction furnace for heating and melting, and preserving heat for a period of time to remove volatile components and uniform slag components; 3) Pouring the molten slag into water for quenching to obtain a glassy state sample; 4) Crushing a glassy sample, and adding required amount of carbonaceous material and cellulose binder to prepare slurry; 5) And (3) feeding the obtained slurry into a spray particle drying tower for drying and granulating, wherein the water content of the product is required to be less than 0.5%, the granularity is in the range of 0.01-2 mm, and sealing and bagging the product for later use.
The proportion of the components of the magnesium chromite in the mold flux is shown in table 1, and the main physical property indexes of the mold flux are shown in table 2.
In the examples and comparative examples, the composition of the magnesium chromite is as follows in mass percent: the content of MgCr2O4 in the marcasite used in the examples and comparative examples was about 85%.
Examples 1 to 3
Preparing materials: the compositions are shown in table 1.
The preparation process comprises the following steps: the same as in example 1.
The main physical properties of the mold flux are shown in Table 2.
TABLE 2 chemical composition (wt%) of mold flux and physical properties thereof in examples 1 to 3 and comparative examples 1 to 3
As is clear from Table 2, the melt temperatures in examples 1 to 3 were 1124 ℃, 1052 ℃, 1229 ℃, and 1300 ℃ viscosities were 0.373 pas, 0.241 pas, and 0.472 pas, respectively, and wetting angles of the mold flux were 45.56 °, 43.21 °, and 36.62 °, respectively.
Comparative examples 1 to 3
Preparing materials: the compositions are shown in Table 2.
The preparation process comprises the following steps: the same as in example 1.
The main physical properties of the mold flux are shown in Table 2.
Comparative examples 1 to 3 are general cold heading steel mold fluxes, in which the wollastonite content of comparative examples 1 to 3 is > 44%, the melting temperatures thereof are 1244 ℃, 1250 ℃, 1280 ℃, the viscosities thereof at 1300 ℃ are 0.477 pas, 0.525 pas, 0.508 pas, and the wetting angles thereof are 34.21 °, 31.24 °, and 44.39 °, respectively.
The melting temperature of comparative examples 1 to 3 is too high, resulting in a small thickness of slag film, unfavorable for the lubrication of casting blank, too high viscosity, and easy generation of cracks in the casting blank.
The melting temperature and viscosity of examples 1 to 3 are lower than those of comparative examples 1 to 3, which is favorable for forming a liquid slag layer and lubricating a casting blank.
The mold flux of the above embodiment is used for continuous casting of cold heading steel; in the cold forging steel, the content of Mn is 0.60wt%, the content of Cr is 1.10wt%, and the content of aluminum is 0.02wt%. The effect is shown in table 3:
table 3 slag consumption and slag inclusion incidence of mold flux in examples 1 to 3 and comparative examples 1 to 3
| Item | Example 1 | Example 2 | Example 3 | Comparative example 1 | Comparative example 2 | Comparative example 3 |
| Slag consumption (kg/t) | 0.41 | 0.42 | 0.43 | 0.47 | 0.51 | 0.48 |
| Incidence of slag inclusion | Is low in | Is lower than | Is low with | Is higher than | Height of | Is higher than |
From the viewpoint of the slag inclusion occurrence rate, the casting slab mold fluxes of examples 1 to 3 had a significantly reduced slag inclusion defect occurrence rate as compared with those of comparative examples 1 to 3. Compared with comparative examples 1 to 3, the steel slag interface stability of examples 1 to 3 is improved, the slag entrapment inhibiting capability is strong, the lubricating property is good, the heat transfer can be well controlled, the continuous casting process of cold heading steel is ensured to be smoothly carried out, and the generation of longitudinal cracks can be effectively prevented. From the perspective of raw material cost, the slag consumption of the examples 1-3 is less than that of the comparative examples 1-3, so that the cost of the casting powder is reduced to a certain extent.
Claims (10)
1. The novel cold heading steel casting powder is characterized in that: the covering slag comprises the following components in percentage by mass:
30-45% of wollastonite, 5-12% of limestone, 10-18% of bauxite, 1-6% of pyrolusite, 1-8% of fluorite, 0-5% of magnesia, 4-13% of sodium carbonate, 1-6% of borax, 9-20% of carbon powder and 1-4% of ferrochrome.
2. The mold flux according to claim 1, characterized in that: the covering slag comprises the following components in percentage by mass:
30-43% of wollastonite, 5.50-12% of limestone, 11-18% of bauxite, 1-5% of pyrolusite, 2-7% of fluorite, 0-3% of magnesia, 4-12% of sodium carbonate, 1-5% of borax, 10-20% of carbon powder and 1.50-4% of magnesium chromite.
3. The mold flux according to claim 1, characterized in that: the covering slag comprises the following components in percentage by mass:
36.38-42.98% of wollastonite, 8.03-11.18% of limestone, 12.34-17.18% of bauxite, 1.42-4.78% of pyrolusite, 2.81-6.88% of fluorite, 0.10-2.16% of magnesia, 5.12-11.33% of sodium carbonate, 1.16-4.58% of borax, 10.33-16.38% of carbon powder and 1.62-3.48% of ferrochromite.
4. The mold flux according to claim 3, characterized in that: the covering slag comprises the following components in percentage by mass:
38.98-41.83 percent of wollastonite, 9.63-10.28 percent of limestone, 14.34-15.68 percent of bauxite, 2.12-3.18 percent of pyrolusite, 5.81-6.88 percent of fluorite, 0.10-0.21 percent of magnesia, 6.02-9.03 percent of sodium carbonate, 1.16-2.58 percent of borax, 11.3-15.18 percent of carbon powder and 2.02-3.18 percent of magnesium chromite.
5. The mold flux according to claim 4, wherein: the covering slag comprises the following components in percentage by mass:
40.94 percent of wollastonite, 10.19 percent of limestone, 14.50 percent of bauxite, 2.50 percent of pyrolusite, 6.64 percent of fluorite, 0.10 percent of magnesia, 6.89 percent of sodium carbonate, 1.90 percent of borax, 13.30 percent of carbon powder and 3.03 percent of magnesiochromite.
6. The novel cold heading steel mold flux of claim 1, wherein: the melting temperature of the covering slag is 1047-1271 ℃.
7. The novel cold heading steel mold flux of claim 1, wherein: the viscosity of the covering slag is 0.221-0.422 Pa.s at 1300 ℃.
8. The novel cold heading steel mold flux of claim 1, wherein: the wetting angle of the covering slag is 36.62-45.6 degrees.
9. The mold flux according to claim 5, characterized in that: when the content of MgCr2O4 in the magnesium chromite is 84-86%, the melting temperature of the protective slag is 1123-1125 ℃;
the viscosity of the covering slag is 0.37-0.38 Pa.s at 1300 ℃;
the wetting angle of the covering slag is 45.4-45.6 degrees.
10. Use of the novel cold heading steel mold flux according to any one of claims 1 to 9, wherein: the covering slag is used for continuous casting of cold heading steel; in the cold forging steel, the content of Mn is 0.50wt% -0.88 wt%, the content of Cr is 0.90wt% -1.28 wt%, and the content of aluminum is 0.01wt% -0.6 wt%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210982640.1A CN115301907A (en) | 2022-08-16 | 2022-08-16 | Novel cold heading steel covering slag |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210982640.1A CN115301907A (en) | 2022-08-16 | 2022-08-16 | Novel cold heading steel covering slag |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115301907A true CN115301907A (en) | 2022-11-08 |
Family
ID=83862018
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210982640.1A Pending CN115301907A (en) | 2022-08-16 | 2022-08-16 | Novel cold heading steel covering slag |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115301907A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006289383A (en) * | 2005-04-06 | 2006-10-26 | Sumitomo Metal Ind Ltd | Mold flux for continuous casting of steel |
| US20100139167A1 (en) * | 2008-12-08 | 2010-06-10 | General Electric Company | Gasifier additives for improved refractory life |
| CN103769555A (en) * | 2012-10-26 | 2014-05-07 | 青岛正望钢水控制股份有限公司 | High-lubrication slag-strip-free gettering crystallizer casting powder special for low-carbon moderately-thick slab |
| CN109967707A (en) * | 2019-05-15 | 2019-07-05 | 西峡龙成冶金材料有限公司 | The continuous-casting crystallizer especially used covering slag of carbon and low-alloy and its application in a kind of CSP |
| CN110918919A (en) * | 2019-12-13 | 2020-03-27 | 中南大学 | Method for controlling uniform crystallization of casting powder and eliminating needle-shaped crystals |
| CN112620598A (en) * | 2020-12-16 | 2021-04-09 | 西峡龙成冶金材料有限公司 | Continuous casting crystallizer casting powder special for sorbite stainless steel and application thereof |
-
2022
- 2022-08-16 CN CN202210982640.1A patent/CN115301907A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006289383A (en) * | 2005-04-06 | 2006-10-26 | Sumitomo Metal Ind Ltd | Mold flux for continuous casting of steel |
| US20100139167A1 (en) * | 2008-12-08 | 2010-06-10 | General Electric Company | Gasifier additives for improved refractory life |
| CN103769555A (en) * | 2012-10-26 | 2014-05-07 | 青岛正望钢水控制股份有限公司 | High-lubrication slag-strip-free gettering crystallizer casting powder special for low-carbon moderately-thick slab |
| CN109967707A (en) * | 2019-05-15 | 2019-07-05 | 西峡龙成冶金材料有限公司 | The continuous-casting crystallizer especially used covering slag of carbon and low-alloy and its application in a kind of CSP |
| CN110918919A (en) * | 2019-12-13 | 2020-03-27 | 中南大学 | Method for controlling uniform crystallization of casting powder and eliminating needle-shaped crystals |
| CN112620598A (en) * | 2020-12-16 | 2021-04-09 | 西峡龙成冶金材料有限公司 | Continuous casting crystallizer casting powder special for sorbite stainless steel and application thereof |
Non-Patent Citations (3)
| Title |
|---|
| CHAO XU等: "The Effects of Cr2O3 on the Melting, Viscosity, Heat Transfer, and Crystallization Behaviors of Mold Flux Used for the Casting of Cr-Bearing Alloy Steels", METALLURGICAL AND MATERIALS TRANSACTIONS B, vol. 46, no. 2, 30 April 2015 (2015-04-30), pages 882 - 892, XP035476018, DOI: 10.1007/s11663-014-0258-x * |
| WANLIN WANG等: "Optimization of Mold Flux for the Continuous Casting of Cr-Contained Steels", METALLURGICAL AND MATERIALS TRANSACTIONS B, vol. 49, no. 4, 21 May 2018 (2018-05-21), pages 1580 - 1587, XP036545078, DOI: 10.1007/s11663-018-1279-7 * |
| 陈松林;孙加林;熊小勇;薛文东;王健东;潘波;: "镁锆砖和镁铬砖的抗RH炉渣侵蚀性对比", 耐火材料, no. 06, 15 December 2007 (2007-12-15), pages 417 - 420 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100584487C (en) | Preparation Preliminary melting type continuous casting crystallizer protecting slag | |
| CN101658907B (en) | Protective slag of large-profile round billet continuous-casting crystallizer and method for preparing same | |
| CN101502871B (en) | Cogged ingot continuous casting crystallizer protecting slag and preparation method thereof | |
| CN110315039B (en) | Application of fluorine-free covering slag in titanium-containing steel continuous casting | |
| CN104308104A (en) | Novel casting powder and application thereof | |
| CN102218514A (en) | Medium and low carbon steel continuous casting mold powder as well as preparation method thereof and continuous casting method | |
| WO2022127017A1 (en) | Special continuous casting crystallizer mold powder for sorbite stainless steel and application thereof | |
| CN104607608A (en) | Novel medium manganese steel casting powder for automobile and application thereof | |
| CN104707958A (en) | High-alkalinity continuous casting powder for casting peritectic steel | |
| CN107470576B (en) | A kind of high manganese high-aluminum steel covering slag and its application containing di-iron trioxide | |
| CN107297475B (en) | A kind of high alumina steel continuous casting crystallizer Mold Powder Without Fluorine | |
| CN112756570B (en) | Continuous casting start-up slag for casting peritectic steel | |
| CN115301907A (en) | Novel cold heading steel covering slag | |
| JP7272477B2 (en) | Mold powder for continuous casting of Al-containing hypo-peritectic steel and continuous casting method | |
| JP3141187B2 (en) | Powder for continuous casting of steel | |
| CN106001473B (en) | A kind of chrome-bearing steel continuous crystallizer protecting slag and its application | |
| CN110605365B (en) | Manganese-containing pre-melted material, casting powder containing pre-melted material and application of casting powder | |
| CN113458351A (en) | MnO-containing high-aluminum steel casting powder | |
| CN113798458B (en) | Continuous casting crystallizer casting powder and preparation method and application thereof | |
| CN110560649A (en) | Novel high-aluminum steel casting powder and application thereof | |
| CN109550912A (en) | A kind of hypoergia covering slag of medium carbon steel containing aluminium | |
| CN117206481B (en) | Covering slag for high-pulling-speed continuous casting of high-carbon steel square billets and preparation method and application thereof | |
| CN115351252B (en) | Casting slag for reducing slab continuous casting defect and preparation method thereof | |
| CN109365789B (en) | Nitrogen-containing steel die casting covering slag | |
| KR20020024064A (en) | Synthetic sodium calcium silicate composite for mold flux and mold flux manufactured therefrom |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB03 | Change of inventor or designer information |
Inventor after: Wang Wanlin Inventor after: Chen Botao Inventor after: Yang Yang Inventor after: Zhou Lejun Inventor after: Zeng Jie Inventor after: Zhou Wenhao Inventor after: Luo Deng Inventor after: Lin Hongliang Inventor after: Liu Xiaokang Inventor after: Yang Wenzhi Inventor before: Zhou Lejun Inventor before: Chen Botao Inventor before: Yang Yang Inventor before: Wang Wanlin Inventor before: Zeng Jie Inventor before: Zhou Wenhao Inventor before: Luo Deng Inventor before: Lin Hongliang Inventor before: Liu Xiaokang Inventor before: Yang Wenzhi |
|
| CB03 | Change of inventor or designer information |