CN102851443A - Method for increasing continuous casting heats of aluminum-deoxidized bearing steel - Google Patents
Method for increasing continuous casting heats of aluminum-deoxidized bearing steel Download PDFInfo
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Abstract
A method for increasing continuous casting heats of aluminum-deoxidized bearing steel includes the steps of desulphurizing molten iron; smelting with a converter; allowing the converter to tap and alloying; performing argon stirring in an argon station; refining; vacuum-treating; feeding silicon calcium wire; performing protective casting and continuously casting to obtain blanks. The method has the advantages that original two continuous casting heats of the bearing steel is increased to more than five heats, and production efficiency is greatly improved; the number of using a ladle is increased, consumables consumption is reduced, and labor intensity of workers is reduced; low level of oxygen content and nonmetal impurities can be stably controlled, and steel cleanness is high.
Description
Technical field
The present invention relates to a kind of smelting process, specifically belong to a kind of bearing steel that improves and connect the method for watering the stove number.
Background technology
Bearing is mechanical transmission component, when bearing working, and the effect of bearing high-frequency alternating stress between the inside and outside lasso of bearing and bearing roller, working conditions is very harsh.Under complicated repeated stress effect, the position that fatigue resistance is low on the surface of lasso or rolling body at first produces fatigue cracking, forms at last fatigue flake, makes the bearing broken invalid.
People find through long-term research, the fatigue lifetime of oxygen level remarkably influenced bearing steel.A large amount of Test And Research Works was done to the relation of Oxygen Content of Bearing Steel and fatigue lifetime by Sweden Aktiebolaget SKF, had drawn clear and definite conclusion, and namely the pass of fatigue lifetime and oxygen level is L
10(comparative lifetime)=372 (O)
-1.6, namely be 10 times of oxygen level 0.0040 % bearing steel the fatigue lifetime of oxygen level 0.0010 % bearing steel.Therefore, the oxygen level that how to reduce in the bearing steel is this field worker's research topic always.
For realizing the low oxygen content of bearing steel, generally all need in the steelmaking process to carry out deoxidation with strong reductor Al, low and can obtain lower dissolved oxygen content with Al deoxidation cost, but deoxidation products Al
2O
3Be mingled with and be difficult for the floating removal.And remain in Al in the steel
2O
3Inclusion meeting in the operation of rolling is cracked along rolling direction to be the line inclusion band, and its sharp-pointed corner angle easily cause the formation in hole and become stress riser, and are very unfavorable to the fatigue lifetime of bearing steel, and when the bearing steel continuous casting is produced, Al
2O
3Inclusion is easily assembled adhesion at place, the mouth of a river and is formed dross and stop up the mouth of a river.At present, bearing steel stops up because of the continous casting sprue dross, connects to water the stove number and surpass 2 stoves, causes that production efficiency is low, cost is high, becomes " bottleneck " that the restriction bearing steel adopts continuous casting process to produce.
Chinese patent application number: 01132236 patent documentation, disclose a kind of adopt direct current furnace more than 60 tons just refine (refining slag, various essential iron alloy, carburelant and aluminium deoxidizer are added in the EBT tapping)-ladle furnace refining (BOTTOM ARGON BLOWING)-vacuum oven degassed-die casting process produces the smelting process that oxygen content in steel and titanium content are not more than respectively the high-purity high-carbon high-chromium bearing steel of 0.0007 % and 0.012 %; Chinese patent application number: 200410025102 patent documentation, disclose a kind of adopt batching optimize → 30 tons of electric furnaces just make steel liquid → BOTTOM ARGON BLOWING ladle furnace refining → vacuum oven degassed → die casting process produces the respectively method of≤0.0007 %, 0.0012 %, 0.0055% abrasive high-carbon-chromium bearing steel of oxygen, titanium, nitrogen content; Chinese patent application number: 03153956 patent documentation, disclose a kind of adopt fusing in conventional electric furnace, converter or other non-vacuum melting stove, refining in a refining unit, the refining later stage to feed cored-wire or the adding alloy block carries out barium alloy, to improve the cleanliness factor of steel, making oxygen content in steel is the production method of a kind of barium microalloying bearing steel of 0.0008 %.
Above-mentioned several published patent documentation all is the problems that only solve oxygen level and titanium content, does not all relate to the solution of bearing steel continous casting sprue dross blockage problem.
Also having Japanese patent application publication No. is the patent documentation of: Te Open 2004-169147, discloses a kind of bearing steel production method, after bessemerizing, uses the Al deoxidation in ladle, adds simultaneously the MgO pulvis top slag is carried out modifying process, makes deoxidation products Al
2O
3Being mingled with easy floating removes.Float on the easily curing of molten steel surface but the deficiency of its existence is the top slag, be difficult to fully react between molten steel and the slag, the actual Al that removes
2O
3Be mingled with effect limited, also can not solve the continuous casting production difficult problem of bearing steel.
Summary of the invention
Technical problem to be solved by this invention is: provide a kind of company that can make the bearing steel continuous casting water the stove number bring up to 5 stoves and more than, and can be with its Control for Oxygen Content at≤0.0010 %, non-metallic inclusion is controlled at that category-A≤1.0, category-B≤1.0, C class are 0, the raising aluminium deoxidation bearing steel of D class≤0.5 connects the method for watering the stove number.
Realize the measure of above-mentioned purpose:
A kind of aluminium deoxidation bearing steel that improves connects the method for watering the stove number, its step:
1) desulfurizing iron is controlled blast-meltedly to enter the iron ladle temperature and be not less than 1320 ℃, and in the control desulfurized molten iron: S weight percent content≤0.010%, P weight percent content≤0.20%, Si weight percent content 0.10～1.00%;
2) converter smelting, the temperature that the control desulphurised hot metal enters converter is not less than 1220 ℃, and control oxidation sludge basicity R is not less than 3.0, and control converter terminal C weight percent content is not less than 0.08%; R=CaO/SiO
2
3) converter tapping and alloying, the quantity of slag thickness that the control converter flows into ladle is no more than 150mm; When the tapping to the molten steel total amount 1/4 the time, according to the disposable adding aluminium of 0.20～1.0Kg/ ton steel;
4) the Argon stirring is carried out at the argon station, after Argon stirs and is no less than 3 minutes, according to≤0.8Kg/ ton steel feeding Al line;
5) carry out refining, refining slag is selected CaO-SiO
2-Al
2O
3Slag system, basicity R:2.0～5.0 in the control refining slag, R=CaO/SiO
2
6) carry out vacuum-treat, control vacuum tightness kept under the 150Pa 5～30 minutes being not more than;
7) feed silicon-calcium wire and process, according to 0.10～0.80Kg/ ton steel feeding silicon-calcium wire, be routinely added to subsequently carbonization rice husk, and carry out the low argon flow amount stirring of routine and be no less than 5 minutes;
8) carry out protective casting and continuous casting and become base, control Metal in Tundish superheating temperature is at 15～35 ℃; The control casting speed is: 0.5～2.0m/min.
The present invention compared with prior art has following major advantage: the company of bearing steel continuous casting waters the stove number and brings up to 5 stoves and above by existing 2 stoves, and production efficiency is improved greatly; The ladle access times increase, and refractory consumption reduces, and labor strength reduces; Can stablize control oxygen level and nonmetal inclusion at lower level, the steel cleanliness factor is high.
Embodiment
The below is described in detail the present invention:
Table 1 is each embodiment assay tabulation of various embodiments of the present invention;
Embodiment 1(continuous casting even waters the 1st stove):
1) desulfurizing iron, it is blast-melted that to enter the iron ladle temperature be 1320 ℃, behind the desulfurizing iron, the weight percent content of following component is controlled to be in the molten iron: S:0.005%, P:0.15%, Si:0.30%;
2) converter smelting, the temperature that the control desulphurised hot metal enters converter is 1250 ℃, control oxidation sludge basicity R:3.5, control converter terminal C weight percent content is 0.08%;
3) converter tapping and alloying, the quantity of slag thickness that the control converter flows into ladle is 80mm; When the tapping to the molten steel total amount 1/4 the time, according to the disposable adding aluminium of 0.50Kg/ ton steel;
4) the Argon stirring is carried out at the argon station, and Argon stirred after 3 minutes, according to 0.5Kg/ ton steel feeding Al line; Als leaving from station is 0.04%;
5) carry out refining, refining slag is selected CaO-SiO
2-Al
2O
3Slag system, basicity R:2.0 in the control refining slag;
6) carry out the RH vacuum-treat, control vacuum tightness kept 30 minutes under 150Pa;
7) feed silicon-calcium wire and process, according to 0.30Kg/ ton steel feeding silicon-calcium wire, be routinely added to subsequently carbonization rice husk, and carrying out routine, to hang down the argon flow amount churning time be 10 minutes;
8) carry out protective casting and continuous casting and become base, 20 ℃ of control Metal in Tundish superheating temperature; The control casting speed is: 0.5m/min.
By the inspection by sampling rule of national bearing steel standard GB/T18254-2002, embodiment 1(continuous casting even being watered the 1st stove) this stove steel has carried out the total oxygen content analysis and non-metallic inclusion is evaluated, and the results are shown in Table 1.
Embodiment 2(continuous casting even waters the 2nd stove):
1) desulfurizing iron, it is blast-melted that to enter the iron ladle temperature be 1325 ℃, behind the desulfurizing iron, the weight percent content of following component is controlled to be in the molten iron: S:0.008%, P:0.10%, Si:0.10%;
2) converter smelting, the temperature that the control desulphurised hot metal enters converter is 1260 ℃, control oxidation sludge basicity R:3.0, control converter terminal C weight percent content is 0.15%;
3) converter tapping and alloying, the quantity of slag thickness that the control converter flows into ladle is 50mm; When the tapping to the molten steel total amount 1/4 the time, according to the disposable adding aluminium of 0.70Kg/ ton steel;
4) the Argon stirring is carried out at the argon station, and Argon stirred after 3 minutes, according to 0.1Kg/ ton steel feeding Al line; Als leaving from station is 0.02%;
5) carry out refining, refining slag is selected CaO-SiO
2-Al
2O
3Slag system, basicity R:4.0 in the control refining slag;
6) carry out the RH vacuum-treat, control vacuum tightness kept 10 minutes under 110Pa;
7) feed silicon-calcium wire and process, according to 0.10Kg/ ton steel feeding silicon-calcium wire, be routinely added to subsequently carbonization rice husk, and carrying out routine, to hang down the argon flow amount churning time be 5 minutes;
8) carry out protective casting and continuous casting and become base, 15 ℃ of control Metal in Tundish superheating temperature; The control casting speed is: 0.8m/min.
By the inspection by sampling rule of national bearing steel standard GB/T18254-2002, this stove steel of the present embodiment (continuous casting even waters the 2nd stove) has been carried out total oxygen content analysis and non-metallic inclusion evaluation, the results are shown in subordinate list 1.
Embodiment 3(continuous casting even waters the 3rd stove):
1) desulfurizing iron, it is blast-melted that to enter the iron ladle temperature be 1330 ℃, behind the desulfurizing iron, the weight percent content of following component is controlled to be in the molten iron: S:0.008%, P:0.12%, Si:1.0%;
2) converter smelting, the temperature that the control desulphurised hot metal enters converter is 1290 ℃, control oxidation sludge basicity R:3.8, control converter terminal C weight percent content is 0.3%;
3) converter tapping and alloying, the quantity of slag thickness that the control converter flows into ladle is 150mm; When the tapping to the molten steel total amount 1/4 the time, according to the disposable adding aluminium of 0.80Kg/ ton steel;
4) the Argon stirring is carried out at the argon station, and Argon stirred after 6 minutes, according to 0.1Kg/ ton steel feeding Al line; Als leaving from station is 0.015%;
5) carry out refining, refining slag is selected CaO-SiO
2-Al
2O
3Slag system, basicity R:4.5 in the control refining slag;
6) carry out the RH vacuum-treat, control vacuum tightness kept 20 minutes under 67Pa;
7) feed silicon-calcium wire and process, according to 0.80Kg/ ton steel feeding silicon-calcium wire, be routinely added to subsequently carbonization rice husk, and carrying out routine, to hang down the argon flow amount churning time be 30 minutes;
8) carry out protective casting and continuous casting and become base, 35 ℃ of control Metal in Tundish superheating temperature; The control casting speed is: 1.2m/min.
By the inspection by sampling rule of national bearing steel standard GB/T18254-2002, this stove steel of the present embodiment (continuous casting even waters the 3rd stove) has been carried out total oxygen content analysis and non-metallic inclusion evaluation, the results are shown in subordinate list 1.
Embodiment 4(continuous casting even waters the 4th stove):
1) desulfurizing iron, it is blast-melted that to enter the iron ladle temperature be 1395 ℃, behind the desulfurizing iron, the weight percent content of following component is controlled to be in the molten iron: S:0.007%, P:0.10%, Si:0.4%;
2) converter smelting, the temperature that the control desulphurised hot metal enters converter is 1350 ℃, control oxidation sludge basicity R:5.0, control converter terminal C weight percent content is 0.35%;
3) converter tapping and alloying adopt AlMgC matter ladle, and the quantity of slag thickness that the control converter flows into ladle is 150mm; When the tapping to the molten steel total amount 1/4 the time, according to the disposable adding aluminium of 0.40Kg/ ton steel;
4) the Argon stirring is carried out at the argon station, and Argon stirred after 3 minutes, according to 0.5Kg/ ton steel feeding Al line; Als leaving from station is 0.025%;
5) carry out refining, refining slag is selected CaO-SiO
2-Al
2O
3Slag system, basicity R:4.2 in the control refining slag;
6) carry out the VD vacuum-treat, control vacuum tightness kept 5 minutes under 20Pa;
7) feed silicon-calcium wire and process, according to 0.60Kg/ ton steel feeding silicon-calcium wire, be routinely added to subsequently carbonization rice husk, and carrying out routine, to hang down the argon flow amount churning time be 25 minutes;
8) carry out protective casting and continuous casting and become base, 25 ℃ of control Metal in Tundish superheating temperature; The control casting speed is: 1.5m/min.
By the inspection by sampling rule of national bearing steel standard GB/T18254-2002, this stove steel of the present embodiment (continuous casting even waters the 4th stove) has been carried out total oxygen content analysis and non-metallic inclusion evaluation, the results are shown in subordinate list 1.
Embodiment 5(continuous casting even waters the 5th stove):
1) desulfurizing iron, it is blast-melted that to enter the iron ladle temperature be 1325 ℃, behind the desulfurizing iron, the weight percent content of following component is controlled to be in the molten iron: S:0.007%, P:0.20%, Si:0.4%;
2) converter smelting, the temperature that the control desulphurised hot metal enters converter is 1220 ℃, control oxidation sludge basicity R:5.0, control converter terminal C weight percent content is 0.4%;
3) tapping and alloying, control converter flow into and adopt the quantity of slag thickness of AlMgC matter ladle is 60mm; When the tapping to the molten steel total amount 1/4 the time, according to the disposable adding aluminium of 1.0Kg/ ton steel;
4) the Argon stirring is carried out at the argon station, and Argon stirred after 3 minutes, according to 0.1Kg/ ton steel feeding Al line; Als leaving from station is 0.01%;
5) carry out refining, refining slag is selected CaO-SiO
2-Al
2O
3Slag system, basicity R:3.5 in the control refining slag;
6) carry out the VD vacuum-treat, control vacuum tightness kept 10 minutes under 25Pa;
7) feed silicon-calcium wire and process, according to 0.20Kg/ ton steel feeding silicon-calcium wire, be routinely added to subsequently carbonization rice husk, and carrying out routine, to hang down the argon flow amount churning time be 15 minutes;
8) carry out protective casting and continuous casting and become base, 20 ℃ of control Metal in Tundish superheating temperature; The control casting speed is: 2.0m/min.
By the inspection by sampling rule of national bearing steel standard GB/T18254-2002, this stove steel of the present embodiment (continuous casting even waters the 5th stove) has been carried out total oxygen content analysis and non-metallic inclusion evaluation, the results are shown in subordinate list 1.
Embodiment 6(continuous casting even waters the 6th stove):
1) desulfurizing iron, it is blast-melted that to enter the iron ladle temperature be 1340 ℃, behind the desulfurizing iron, the weight percent content of following component is controlled to be in the molten iron: S:0.002%, P:0.05%, Si:0.4%;
2) converter smelting, the temperature that the control desulphurised hot metal enters converter is 1275 ℃, control oxidation sludge basicity R:3.7, control converter terminal C weight percent content is 0.5%;
3) tapping and alloying, control converter flow into and adopt the quantity of slag thickness of AlMgC matter ladle is 110mm; When the tapping to the molten steel total amount 1/4 the time, according to the disposable adding aluminium of 0.2Kg/ ton steel;
4) the Argon stirring is carried out at the argon station, and Argon stirred after 3 minutes, according to 0.8Kg/ ton steel feeding Al line; Als leaving from station is 0.03%;
5) carry out refining, refining slag is selected CaO-SiO
2-Al
2O
3Slag system, basicity R:4.3 in the control refining slag;
6) carry out the VD vacuum-treat, control vacuum tightness kept 15 minutes under 75Pa;
7) feed silicon-calcium wire and process, according to 0.10Kg/ ton steel feeding silicon-calcium wire, be routinely added to subsequently carbonization rice husk, and carrying out routine, to hang down the argon flow amount churning time be 15 minutes;
8) carry out protective casting and continuous casting and become base, 20 ℃ of control Metal in Tundish superheating temperature; The control casting speed is: 1.7m/min.
By the inspection by sampling rule of national bearing steel standard GB/T18254-2002, this stove steel of the present embodiment (continuous casting even waters the 6th stove) has been carried out total oxygen content analysis and non-metallic inclusion evaluation, the results are shown in subordinate list 1.
Each embodiment assay tabulation of table 1
Above-described embodiment only exemplifies for the best, and is not to be restriction to embodiments of the present invention.
Claims (1)
1. one kind is improved the method that the aluminium deoxidation bearing steel even waters the stove number, its step:
1) desulfurizing iron is controlled blast-meltedly to enter the iron ladle temperature and be not less than 1320 ℃, and in the control desulfurized molten iron: S weight percent content≤0.010%, P weight percent content≤0.20%, Si weight percent content 0.10～1.00%;
2) converter smelting, the temperature that the control desulphurised hot metal enters converter is not less than 1220 ℃, and control oxidation sludge basicity R is not less than 3.0, and control converter terminal C weight percent content is not less than 0.08%; R=CaO/SiO
2
3) converter tapping and alloying, the quantity of slag thickness that the control converter flows into ladle is no more than 150mm; When the tapping to the molten steel total amount 1/4 the time, according to the disposable adding aluminium of 0.20～1.0Kg/ ton steel;
4) the Argon stirring is carried out at the argon station, after Argon stirs and is no less than 3 minutes, according to≤0.8Kg/ ton steel feeding Al line;
5) carry out refining, refining slag is selected CaO-SiO
2-Al
2O
3Slag system, basicity R:2.0～5.0 in the control refining slag, R=CaO/SiO
2
6) carry out vacuum-treat, control vacuum tightness kept under the 150Pa 5～30 minutes being not more than;
7) feed silicon-calcium wire and process, according to 0.10～0.80Kg/ ton steel feeding silicon-calcium wire, be routinely added to subsequently carbonization rice husk, and carry out the low argon flow amount stirring of routine and be no less than 5 minutes;
8) carry out protective casting and continuous casting and become base, control Metal in Tundish superheating temperature is at 15～35 ℃; The control casting speed is: 0.5～2.0m/min.
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| CN107904497A (en) * | 2017-12-13 | 2018-04-13 | 西王金属科技有限公司 | A kind of high life bearing steel and its manufacture method |
| CN111719037A (en) * | 2019-03-21 | 2020-09-29 | 本钢板材股份有限公司 | Method for increasing number of continuous casting furnaces of double-flow plate blank tundish |
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| CN113444857A (en) * | 2021-06-22 | 2021-09-28 | 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 |
| CN113957197A (en) * | 2021-10-26 | 2022-01-21 | 北京科技大学 | Converter tapping metallurgy process for reducing large-size inclusions in bearing steel |
| CN115138832A (en) * | 2021-03-29 | 2022-10-04 | 宝山钢铁股份有限公司 | Method for prolonging number of pure steel pouring furnaces based on molten steel weight information |
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| CN104046750B (en) * | 2013-10-14 | 2016-03-09 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of method preparing bearing steel |
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| CN107790663A (en) * | 2016-09-06 | 2018-03-13 | 鞍钢股份有限公司 | A kind of production method of Al killed cold heading steel |
| CN107904497A (en) * | 2017-12-13 | 2018-04-13 | 西王金属科技有限公司 | A kind of high life bearing steel and its manufacture method |
| CN107904497B (en) * | 2017-12-13 | 2019-11-22 | 西王金属科技有限公司 | A kind of high life bearing steel and its manufacturing method |
| CN111719037A (en) * | 2019-03-21 | 2020-09-29 | 本钢板材股份有限公司 | Method for increasing number of continuous casting furnaces of double-flow plate blank tundish |
| CN112442572A (en) * | 2019-08-30 | 2021-03-05 | 宝山钢铁股份有限公司 | Deoxidation control method for high-end bearing steel inclusion |
| CN112267058B (en) * | 2020-09-09 | 2021-11-19 | 邯郸钢铁集团有限责任公司 | Method for increasing number of continuous-drawing bearing steel furnaces of 8-machine 8-strand continuous casting machine |
| CN112267058A (en) * | 2020-09-09 | 2021-01-26 | 邯郸钢铁集团有限责任公司 | Method for increasing number of continuous-drawing bearing steel furnaces of 8-machine 8-strand continuous casting machine |
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| CN115138832B (en) * | 2021-03-29 | 2024-01-09 | 宝山钢铁股份有限公司 | Method for prolonging number of pure steel pouring furnaces based on molten steel weight information |
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| CN113957197A (en) * | 2021-10-26 | 2022-01-21 | 北京科技大学 | Converter tapping metallurgy process for reducing large-size inclusions in bearing steel |
| CN113957197B (en) * | 2021-10-26 | 2022-10-21 | 北京科技大学 | Converter tapping metallurgy process for reducing large-size inclusions in bearing steel |
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