CN113444857A - Production process for increasing continuous casting furnace number of aluminum-deoxidized high-carbon chromium bearing steel - Google Patents
Production process for increasing continuous casting furnace number of aluminum-deoxidized high-carbon chromium bearing steel Download PDFInfo
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- CN113444857A CN113444857A CN202110693371.2A CN202110693371A CN113444857A CN 113444857 A CN113444857 A CN 113444857A CN 202110693371 A CN202110693371 A CN 202110693371A CN 113444857 A CN113444857 A CN 113444857A
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- 239000010959 steel Substances 0.000 title claims abstract description 78
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 77
- 238000009749 continuous casting Methods 0.000 title claims abstract description 35
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 20
- 229910052799 carbon Inorganic materials 0.000 title claims description 9
- 229910052804 chromium Inorganic materials 0.000 title claims description 8
- 239000011651 chromium Substances 0.000 title claims description 8
- 239000002893 slag Substances 0.000 claims abstract description 50
- 238000007670 refining Methods 0.000 claims abstract description 23
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 21
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 21
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 18
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 15
- 229910052681 coesite Inorganic materials 0.000 claims abstract description 10
- 229910052593 corundum Inorganic materials 0.000 claims abstract description 10
- 229910052906 cristobalite Inorganic materials 0.000 claims abstract description 10
- 239000000463 material Substances 0.000 claims abstract description 10
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 10
- 229910052682 stishovite Inorganic materials 0.000 claims abstract description 10
- 229910052905 tridymite Inorganic materials 0.000 claims abstract description 10
- 229910001845 yogo sapphire Inorganic materials 0.000 claims abstract description 10
- 239000003575 carbonaceous material Substances 0.000 claims abstract 3
- 238000000034 method Methods 0.000 claims description 25
- 230000008569 process Effects 0.000 claims description 23
- RQMIWLMVTCKXAQ-UHFFFAOYSA-N [AlH3].[C] Chemical compound [AlH3].[C] RQMIWLMVTCKXAQ-UHFFFAOYSA-N 0.000 claims description 7
- 239000002245 particle Substances 0.000 claims description 6
- 238000002844 melting Methods 0.000 claims description 5
- 230000008018 melting Effects 0.000 claims description 4
- 238000010079 rubber tapping Methods 0.000 claims description 4
- 229910052719 titanium Inorganic materials 0.000 claims description 4
- 239000010936 titanium Substances 0.000 claims description 4
- RWDBMHZWXLUGIB-UHFFFAOYSA-N [C].[Mg] Chemical compound [C].[Mg] RWDBMHZWXLUGIB-UHFFFAOYSA-N 0.000 claims description 2
- 238000009628 steelmaking Methods 0.000 claims description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims 1
- 229910052742 iron Inorganic materials 0.000 claims 1
- 229910052596 spinel Inorganic materials 0.000 abstract description 26
- 239000011029 spinel Substances 0.000 abstract description 26
- 238000001514 detection method Methods 0.000 abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 10
- 238000007654 immersion Methods 0.000 abstract description 9
- 239000011819 refractory material Substances 0.000 abstract description 8
- 238000012797 qualification Methods 0.000 abstract description 4
- 238000006243 chemical reaction Methods 0.000 abstract description 3
- 238000009851 ferrous metallurgy Methods 0.000 abstract description 2
- 230000002401 inhibitory effect Effects 0.000 abstract description 2
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical compound [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 abstract 2
- 238000009847 ladle furnace Methods 0.000 description 14
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 13
- 230000000052 comparative effect Effects 0.000 description 13
- 239000001301 oxygen Substances 0.000 description 13
- 229910052760 oxygen Inorganic materials 0.000 description 13
- 238000005266 casting Methods 0.000 description 11
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 9
- 239000011777 magnesium Substances 0.000 description 9
- 238000012360 testing method Methods 0.000 description 7
- 239000011449 brick Substances 0.000 description 6
- 239000000395 magnesium oxide Substances 0.000 description 6
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 4
- 238000009489 vacuum treatment Methods 0.000 description 4
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 3
- 229910000519 Ferrosilicon Inorganic materials 0.000 description 3
- 239000006004 Quartz sand Substances 0.000 description 3
- 235000011941 Tilia x europaea Nutrition 0.000 description 3
- 238000004220 aggregation Methods 0.000 description 3
- 230000002776 aggregation Effects 0.000 description 3
- 239000011575 calcium Substances 0.000 description 3
- 239000004571 lime Substances 0.000 description 3
- -1 magnesium aluminate Chemical class 0.000 description 3
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- GVLXULOSJFEEFT-UHFFFAOYSA-N [Ca].[C].[Zr] Chemical compound [Ca].[C].[Zr] GVLXULOSJFEEFT-UHFFFAOYSA-N 0.000 description 2
- 229910052786 argon Inorganic materials 0.000 description 2
- 238000007664 blowing Methods 0.000 description 2
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 description 2
- 229910052749 magnesium Inorganic materials 0.000 description 2
- 238000011112 process operation Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000009991 scouring Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 230000002195 synergetic effect Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- OSMSIOKMMFKNIL-UHFFFAOYSA-N calcium;silicon Chemical compound [Ca]=[Si] OSMSIOKMMFKNIL-UHFFFAOYSA-N 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000002075 main ingredient Substances 0.000 description 1
- FXNGWBDIVIGISM-UHFFFAOYSA-N methylidynechromium Chemical group [Cr]#[C] FXNGWBDIVIGISM-UHFFFAOYSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
Classifications
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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
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/66—Monolithic refractories or refractory mortars, including those whether or not containing clay
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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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- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3217—Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3231—Refractory metal oxides, their mixed metal oxides, or oxide-forming salts thereof
- C04B2235/3244—Zirconium oxides, zirconates, hafnium oxides, hafnates, or oxide-forming salts thereof
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3418—Silicon oxide, silicic acids, or oxide forming salts thereof, e.g. silica sol, fused silica, silica fume, cristobalite, quartz or flint
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/40—Metallic constituents or additives not added as binding phase
- C04B2235/402—Aluminium
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- C04B2235/42—Non metallic elements added as constituents or additives, e.g. sulfur, phosphor, selenium or tellurium
- C04B2235/422—Carbon
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- C04B2235/9669—Resistance against chemicals, e.g. against molten glass or molten salts
- C04B2235/9676—Resistance against chemicals, e.g. against molten glass or molten salts against molten metals such as steel or aluminium
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Abstract
The invention belongs to the field of ferrous metallurgy, and relates to a production process for increasing the number of continuous casting furnaces of aluminum deoxidized bearing steel2O3‑SiO2Slag system, final slag basicity CaO/SiO2The control range is 3.0-4.5, and the final slag CaO/Al2O3The control range is 1.3-2.5, the addition amount of the refining slag is 8-10 kg/t, and simultaneously, the final slag FeO + MnO is required<0.8 percent; the molten pool and bottom of the ladle are made of alumina-carbon material, the ladle is made of alumina dry material, and the stopper rod is made of whole alumina-carbon material. The invention can reduce the reaction between molten steel and refractory material while inhibiting the slag steel reaction, reduce the generation of spinel inclusions, and obviously improve the number of continuous casting furnaces and the water immersion flaw detection qualification rate.
Description
Technical Field
The invention belongs to the field of ferrous metallurgy, and relates to a production process for increasing the number of continuous casting furnaces of aluminum deoxidized bearing steel.
Background
The bearing is a key part of a mechanical part and has extremely high requirements on the fatigue life and the performance stability. Researches show that the purity of the bearing steel has important influence on the fatigue life and the performance stability of the bearing. Therefore, the bearing steel is usually deoxidized by using metallic aluminum in the refining process, and high-alkalinity refining slag is used to ensure the purity of the bearing steel. The existing process can control the total oxygen in the steel to be below 6ppm, and the ultra-high cleanliness of the bearing steel is controlled. However, magnesium aluminate spinel inclusions are often formed in steel refined by aluminum deoxidized high-alkalinity refining slag. The melting point of the magnesia-alumina spinel inclusions is 2053 ℃, the size of the magnesia-alumina spinel inclusions is below 10 microns, the magnesia-alumina spinel inclusions are solid under the condition of steelmaking temperature, and the fine solid spinel inclusions can be gathered on the inner walls of a stopper rod tip and a submerged nozzle in the pouring process to cause the stopper rod to be lifted and the nozzle to be blocked, and finally, the continuous casting production is interrupted. In addition, spinel inclusions attached to the tip of the stopper rod and the inner wall of the submerged nozzle can be peeled off and enter molten steel under the scouring of the molten steel, and finally the spinel inclusions are remained in the molten steel to form large-size macroscopic inclusions, so that the product is unqualified in water immersion flaw detection. Therefore, spinel inclusion not only affects continuous casting production of bearing steel, but also causes too low number of continuous casting furnaces (generally less than 6 furnaces), high production cost, and also affects quality of bearing steel products, and particularly brings about the problem that large-size macroscopic inclusion in the bearing steel exceeds standard.
In order to solve the problem of low continuous casting furnace number of bearing steel, patent CN 102851443B discloses a method for increasing the continuous casting furnace number of aluminum deoxidized bearing steel, which mainly improves the casting property by Ca treatment after RH vacuum treatment, and the continuous casting furnace number of the bearing steel can be increased to more than 6 furnaces by feeding a silicon-calcium wire according to 0.10 Kg/ton steel after RH vacuum treatment. Research shows that the higher the Ca content in the steel, the higher the probability that the content of calcium aluminate inclusion in the bearing steel exceeds the standard. The medium and high end bearing steel definitely requires the production process to strictly prohibit any form of Ca treatment.
Patent CN 110093553A discloses a production method for greatly increasing the number of continuous casting furnaces of carbon-chromium bearing steel, which mainly adopts a zirconium-calcium-carbon submerged nozzle and is assisted with argon blowing so as to increase the number of continuous casting furnaces to 15-18 furnaces. The principle is that the zirconium calcium carbon water gap and the spinel in the steel can form liquid calcium aluminate and the argon blowing is assisted to achieve the purpose of preventing the spinel from gathering on the inner wall of the refractory material. It can be seen that the patented method improves castability by preventing the angle of aggregation of inclusions, and the number of inclusions in steel cannot be reduced.
The aggregation of magnesia-alumina spinel on the surface of refractory materials in steel is a main reason for causing the stopper rod to be lifted and the submerged nozzle to be blocked, and the reason for causing the water immersion flaw detection of final products is that the aggregated spinel is peeled off and enters the molten steel under the scouring action of the molten steel.
The magnesium aluminate spinel is an inclusion which is reduced or avoided when the casting performance of the bearing steel is improved, and the generation amount of the spinel is increased along with the increase of alkalinity and is reduced along with the reduction of the alkalinity. However, the bearing steel is required to have extremely low oxygen content (the total oxygen content of the super grade bearing steel is required to be less than 6ppm), the oxygen content of the bearing steel is increased only by reducing the alkalinity of the refining slag, and other adverse influence factors are brought, so that the quality of the bearing steel is reduced.
Therefore, the technical problem to be solved by the invention is how to inhibit the generation of spinel and greatly increase the number of continuous casting furnaces while ensuring that the bearing steel has extremely low oxygen content.
Disclosure of Invention
Aiming at the problems of poor castability of bearing steel and unqualified water immersion flaw detection pointed out in the background art, the invention aims to provide a production process for increasing the continuous casting furnace number of the aluminum-deoxidized high-carbon chromium bearing steel.
In order to achieve the purpose, the invention adopts the technical scheme that: a production process for increasing the number of continuous casting furnaces of aluminum-deoxidized high-carbon chromium bearing steel comprises the following production process flows: converter/electric furnace-LF refining-RH vacuum treatment-square billet continuous casting, and other unexplained conventional processes can be controlled according to product requirements.
(1) Aluminum particles are added for deoxidation at one time in the tapping process, the aluminum content in the steel is required to be added to 0.03-0.06%, low-titanium low-aluminum ferrosilicon is added at the same time, the Si content in the steel is required to reach 0.10% -0.16%, and slagging-off or slag fishing are carried out before LF treatment;
(2) adding lime, quartz sand and CaO-Al into LF refining slag2O3One or more of premelting slag is required to be subjected to CaO/SiO (basic oxygen) of final slag after LF (ladle furnace) refining is finished2The control range is 3.0-4.5, and the final slag CaO/Al2O3The control range is 1.3-2.5%, and the final slag is required to be 0.3%<FeO+MnO<1.0 percent, and aluminum grains are strictly forbidden to be supplemented in the LF treatment process; the addition amount of the refining slag is 8-10 kg/t;
(3) RH vacuum treatment-billet continuous casting can be controlled according to the product requirement, and the main refractory components related to the smelting process need to be additionally controlled, wherein
The ladle molten pool and the ladle bottom adopt aluminum carbon, and the components of the aluminum carbon are as follows: c: 7 to 12% of Al2O3：75～86％，SiO2: 5-10%, Al: 0.5-1.5%, and the ladle slag line adopts a conventional magnesia carbon slag line.
In order to ensure the corrosion resistance of the steel ladle to the refining slag, the slag line part of the steel ladle is built by adopting magnesium-carbon steel ladle bricks, magnesium oxide in the slag line can be dissolved into the refining slag, if the oxygen potential of the refining slag and the molten steel are not properly controlled, the dissolved magnesium oxide can be reduced to enter the molten steel, and then reacts with aluminum oxide in the steel to generate spinel. In order to prevent the reduction of magnesium oxide dissolved in the slag, it is also necessary to control the CaO/SiO content of the slag2、CaO/Al2O3And the purpose of inhibiting the precipitation of spinel is achieved by the synergistic effect of the conditions.
The middle package adopts an alumina dry material, and the components of the material are as follows: al (Al)2O3：80～90％，SiO2：3～8％。
The stopper rod is an integral stopper rod and comprises the following components: c: 10 to 20% of Al2O3：70～80％，SiO2：3～7％，Al：0.1～0.5％；
The submerged nozzle bowl comprises the following components: ZrO (ZrO)2：80～90％，SiO2：10～20％。
Compared with the prior art, the invention has the beneficial effects that:
the invention obtains the optimum refining slag system composition such as alkalinity CaO/SiO through test and exploration2When the ratio is 3 to 4.5, CaO/Al is appropriately controlled2O3Under the conditions, the slag system has a synergistic effect with each other, so that the slag system can reduce the Mg increase of molten steel caused by slag steel reaction to the maximum extent, ensure extremely low oxygen content of the molten steel, and simultaneously adopt the aluminum-carbon refractory material to reduce the Mg supply of the refractory material to the steel. Therefore, compared with the prior art, the invention can firstly effectively reduce the Mg content in the steel, reduce the generation amount of spinel, ensure the extremely low oxygen content of the molten steel, improve the purity of the molten steel, and secondly, Al2O3the-C refractory material can effectively reduce the aggregation of spinel mixed on the surface of the refractory material in steel, thereby greatly increasing the number of continuous casting furnaces. The invention can also effectively solve the problem of unqualified water immersion flaw detection caused by large-size inclusions.
Detailed Description
Examples
The test steel is high-carbon chromium bearing steel with the mark of GCr15, and the production flow comprises converter/electric furnace-LF refining-RH vacuum treatment-square billet continuous casting:
(1) aluminum particles are added for deoxidation at one time in the tapping process, the aluminum content in the steel is required to be added to 0.03-0.06%, low-titanium low-aluminum ferrosilicon is added at the same time, the Si content in the steel is required to reach 0.10% -0.16%, and slagging-off or slag fishing are carried out before LF treatment;
(2) adding lime, quartz sand or CaO-Al into LF refining slag2O3One or more of premelting slag is required to ensure the alkalinity of final slag CaO/SiO of refining slag after LF refining is finished2The control range is 3.0-4.5, and the final slag CaO/Al2O3The control range is 1.3-2.5, the addition amount of the refining slag is 8-10 kg/t, and the final slag is required to be 0.3%<FeO+MnO<1.0 percent, and aluminum particles are strictly forbidden to be added into the steel in the LF treatment process;
(3) after LF refining is finished, RH vacuum treatment is carried out on the molten steel according to a conventional process, and the treatment time is not less than 25 min;
(4) after the RH is broken, the molten steel is continuously cast by adopting a five-machine five-flow continuous casting machine, and the section of a casting blank is 280mm multiplied by 320 mm.
The components of the LF refining final slag are shown in table 1, examples 1-8, the ladle melting pool and the ladle bottom part are built by adopting aluminum-carbon ladle bricks, and the components of the ladle bricks are shown in table 1, examples 1-8. The compositions of the continuous casting tundish, the stopper rod and the submerged nozzle bowl mouth refractory are shown in Table 2, examples 1-8.
The rest of the process operations which are not explicitly described are all conventional operations in the industry.
Comparative example
The production flow comprises the following steps of converter/electric furnace-LF refining-RH vacuum treatment-square billet continuous casting:
(1) adding aluminum particles for deoxidation in the tapping process, simultaneously adding part of low-titanium low-aluminum ferrosilicon, and slagging off or slag fishing before LF treatment;
(2) adding lime, quartz sand or CaO-Al into LF refining slag2O3Pre-melting slag, wherein the components of refined final slag are shown in comparative examples 1-6 in table 1;
(3) after LF refining is finished, RH vacuum treatment is carried out on the molten steel according to a conventional process, and the treatment time is not less than 25 min;
(4) after the RH is broken, the molten steel is continuously cast by adopting a five-machine five-flow continuous casting machine, and the section of a casting blank is 280mm multiplied by 320 mm.
The ladle molten pool and the ladle bottom part are built by adopting aluminum-carbon ladle bricks, and the components of the ladle bricks are shown in comparative examples 1-10 in Table 1. The compositions of the continuous casting tundish, the stopper rod and the immersed nozzle bowl mouth refractory materials are shown in the table 2 and the comparative examples 1-10.
The rest of the process operations which are not explicitly described are all conventional operations in the industry.
Test example 1
The bearing steel is continuously produced according to the comparative examples and the embodiment until the stopper rod rises to the limit and the molten steel is interrupted. And counting the maximum continuous casting furnace number under each process condition. Sampling the casting blank, analyzing the Mg content of the casting blank and the quantity density of spinel inclusions in steel under various process conditions, wherein ICP is used for measuring the Mg content, an automatic scanning electron microscope is adopted for measuring the quantity density of spinel, and the scanning area is 100mm2。
Test example 2
Rolling the casting blanks obtained in the embodiment and the comparative example into bars with the diameter of 60mm, carrying out flaw detection on the bars by using ultrasonic water immersion flaw detection with the frequency of 10MHz, detecting 1 bar in each furnace, determining that the bars are unqualified as long as defects with the size of more than 120 micrometers occur, counting the qualification rate under each process condition, and analyzing the total oxygen content of the bars.
Table 1 examples and comparative examples refining final slag and ladle brick main ingredients%
Note: the MgO content in the refining slag is 3-5%, and the MgO content is not considered in the data in the table.
TABLE 2 main components of the continuous casting resistant materials of examples and comparative examples%
TABLE 3 comparison of practical results of production of examples and comparative examples
Under the process conditions provided by the invention, the Mg content in the steel can be controlled to be 2-5 ppm, and the quantity density of the spinel in the casting blank is 20-47/mm2Meanwhile, the number of continuous casting furnaces can reach 12-15 furnaces per casting time. The Mg content in the conventional comparative example process steel is 9-13 ppm, and the quantity of the spinel of the casting blank reaches 103-176/mm2All are higher than the process provided by the invention. Due to the high amount of spinel, the conventional comparative exampleThe number of the process continuous casting furnaces is only 4-8 furnaces/casting time, which is far lower than that of the process provided by the invention. The results of test example 1 are detailed in Table 3. The comparison result shows that the control measure provided by the invention can greatly reduce the amount of spinel in steel and obviously increase the number of continuous casting furnaces.
Meanwhile, the result of the test example 2 shows that the steel grade produced by the process provided by the invention does not detect inclusions larger than 120 microns, the water immersion flaw detection is completely qualified, the water immersion flaw detection qualification rate of the comparative example is only 20-50%, the total oxygen content of the rolled material of the example is 4.3-5.5 ppm, and the total oxygen content of the rolled material of the comparative example is 5.1-6.7 ppm. The test results show that the measures provided by the invention can reduce the total oxygen content of the rolled material and greatly improve the water immersion flaw detection qualification rate of the rolled material while increasing the number of continuous casting furnaces.
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 (3)
1. A production process for increasing the number of continuous casting furnaces of aluminum-deoxidized high-carbon chromium bearing steel is characterized by comprising the following steps of: the production process flow comprises the following steps: converter/electric furnace-LF refining-RH vacuum treatment-square billet continuous casting;
(1) converter/electric furnace steelmaking, aluminum particles are added for deoxidation at one time in the tapping process, the aluminum content in steel is required to reach 0.03-0.06%, and low-titanium low-aluminum silicon iron is added at the same time, the Si content in steel is required to reach 0.10% -0.16%;
(2) slagging off or slag dragging is carried out before LF treatment, and the final slag alkalinity CaO/SiO is carried out after LF refining is finished2The control range is 3.0-4.5, and the final slag CaO/Al2O3The control range is 1.3-2.5%, and the final slag is required to be 0.3%<FeO+MnO<1.0 percent, and aluminum particles are not supplemented to the steel in the LF treatment process;
(3) controlling refractory components in the production process:
wherein, the ladle melting pool and the ladle bottom adopt aluminum carbon, and the ladle slag line adopts a conventional magnesium carbon slag line;
the middle ladle adopts alumina dry material;
the stopper rod is made of an integral aluminum-carbon material and comprises the following components: c: 10 to 20% of Al2O3：70～80％，SiO2：3～7％，Al：0.1～0.5％；
The submerged nozzle bowl comprises the following components: ZrO (ZrO)2：80～90％，SiO2：10～20％。
2. The production process for increasing the number of continuous casting furnaces of aluminum-deoxidized high-carbon chromium bearing steel according to claim 1, which is characterized in that: the steel ladle melting pool and the ladle bottom part adopt the following specific components: c: 7 to 12% of Al2O3：75～86％，SiO2：5～10％，Al：0.5～1.5％。
3. The production process for increasing the number of continuous casting furnaces of aluminum-deoxidized high-carbon chromium bearing steel according to claim 1, which is characterized in that: the middle package adopts an alumina dry material, and the concrete components are as follows: al (Al)2O3：80～90％，SiO2：3～8％。
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| PCT/CN2022/091378 WO2022267707A1 (en) | 2021-06-22 | 2022-05-07 | Production process for increasing continuous casting heats of aluminum-deoxidized high-carbon chromium bearing steel |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114790504A (en) * | 2022-04-02 | 2022-07-26 | 张家港广大特材股份有限公司 | Deoxidation slagging process and steelmaking method adopting same |
| CN115401177A (en) * | 2022-08-02 | 2022-11-29 | 首钢京唐钢铁联合有限责任公司 | Low-carbon steel continuous casting and rolling smelting method capable of avoiding blockage of stopper rod |
| WO2022267707A1 (en) * | 2021-06-22 | 2022-12-29 | 中天钢铁集团有限公司 | Production process for increasing continuous casting heats of aluminum-deoxidized high-carbon chromium bearing steel |
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| CN116043045A (en) * | 2023-02-08 | 2023-05-02 | 广东中南钢铁股份有限公司 | CH1T ultralow-carbon cold heading steel and preparation method thereof |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008149733A1 (en) * | 2007-06-05 | 2008-12-11 | Kabushiki Kaisha Kobe Seiko Sho | Process for producing high cleanliness steel |
| CN102851443A (en) * | 2012-09-19 | 2013-01-02 | 武汉钢铁(集团)公司 | Method for increasing continuous casting heats of aluminum-deoxidized bearing steel |
| CN104087719A (en) * | 2014-07-04 | 2014-10-08 | 常州东大中天钢铁研究院有限公司 | Smelting process of high-carbon bearing steel |
| CN109055664A (en) * | 2018-10-08 | 2018-12-21 | 中天钢铁集团有限公司 | A kind of bearing steel molten steel deoxidation control method of no Ds type impurity |
| CN110093553A (en) * | 2019-03-29 | 2019-08-06 | 邢台钢铁有限责任公司 | A kind of production method that the continuous pouring furnace number of high-carbon-chromium bearing steel is substantially improved |
| CN111793772A (en) * | 2020-06-19 | 2020-10-20 | 中天钢铁集团有限公司 | High-standard bearing steel efficient production process |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005154877A (en) * | 2003-11-28 | 2005-06-16 | Jfe Steel Kk | Method for melting bearing steel |
| CN107338342B (en) * | 2017-07-04 | 2019-06-11 | 北京科技大学 | Single-mouth refining furnace smelts high-cleanness art for refining bearing steel |
| CN112662832A (en) * | 2020-12-18 | 2021-04-16 | 芜湖新兴铸管有限责任公司 | Production method of special-section square billet of high-carbon chromium bearing steel |
| CN113444857B (en) * | 2021-06-22 | 2022-04-26 | 中天钢铁集团有限公司 | Production process for increasing continuous casting furnace number of aluminum-deoxidized high-carbon chromium bearing steel |
-
2021
- 2021-06-22 CN CN202110693371.2A patent/CN113444857B/en active Active
-
2022
- 2022-05-07 WO PCT/CN2022/091378 patent/WO2022267707A1/en active Application Filing
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008149733A1 (en) * | 2007-06-05 | 2008-12-11 | Kabushiki Kaisha Kobe Seiko Sho | Process for producing high cleanliness steel |
| CN102851443A (en) * | 2012-09-19 | 2013-01-02 | 武汉钢铁(集团)公司 | Method for increasing continuous casting heats of aluminum-deoxidized bearing steel |
| CN104087719A (en) * | 2014-07-04 | 2014-10-08 | 常州东大中天钢铁研究院有限公司 | Smelting process of high-carbon bearing steel |
| CN109055664A (en) * | 2018-10-08 | 2018-12-21 | 中天钢铁集团有限公司 | A kind of bearing steel molten steel deoxidation control method of no Ds type impurity |
| CN110093553A (en) * | 2019-03-29 | 2019-08-06 | 邢台钢铁有限责任公司 | A kind of production method that the continuous pouring furnace number of high-carbon-chromium bearing steel is substantially improved |
| CN111793772A (en) * | 2020-06-19 | 2020-10-20 | 中天钢铁集团有限公司 | High-standard bearing steel efficient production process |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022267707A1 (en) * | 2021-06-22 | 2022-12-29 | 中天钢铁集团有限公司 | Production process for increasing continuous casting heats of aluminum-deoxidized high-carbon chromium bearing steel |
| CN114790504A (en) * | 2022-04-02 | 2022-07-26 | 张家港广大特材股份有限公司 | Deoxidation slagging process and steelmaking method adopting same |
| CN115401177A (en) * | 2022-08-02 | 2022-11-29 | 首钢京唐钢铁联合有限责任公司 | Low-carbon steel continuous casting and rolling smelting method capable of avoiding blockage of stopper rod |
| CN115401177B (en) * | 2022-08-02 | 2024-06-07 | 首钢京唐钢铁联合有限责任公司 | Low-carbon steel continuous casting and rolling smelting method capable of avoiding plug rod blockage |
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