CN102051439B - Method for smelting high aluminium steel - Google Patents
Method for smelting high aluminium steel Download PDFInfo
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- CN102051439B CN102051439B CN2010106139378A CN201010613937A CN102051439B CN 102051439 B CN102051439 B CN 102051439B CN 2010106139378 A CN2010106139378 A CN 2010106139378A CN 201010613937 A CN201010613937 A CN 201010613937A CN 102051439 B CN102051439 B CN 102051439B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention relates to a method for smelting high aluminium steel, comprising the steps of electric arc furnace smelting and external refining as well as vacuum furnace smelting. The high aluminium steel smelted by utilizing the method has high purity. After vacuum treatment, gas and impurities can be removed from the molten steel, thereby avoiding accretion at a water gap and segregation of a casting blank.
Description
Technical field
The present invention relates to a kind of method of smelting high aluminum steel.
Background technology
High aluminum steel is a kind of have the very high surface hardness and steel grade of wear resisting property, is widely used in making and can withstands shocks on the parts of working under load and the reciprocal abrasive conditions.Because the mass content of aluminium is usually about 1% in the high aluminum steel; Make molten steel because of aluminium content height thickness, and be prone to oxidizedly again, cause the surface of this kind steel to occur great quality problems such as defective, low power are mingled with, spot segregation easily; Particularly in smelting process; Because aluminium is very easily oxidized, so the difficulty of smelting high aluminum steel is relatively large.
In the prior art, a kind of technical scheme is directly to adopt electric arc furnace to smelt high aluminum steel, and when smelting, and steel scrap is packed in the electric arc furnace, and the energising heating is smelted then.Though the program of the high aluminum steel of this kind smelting is simple; But because harmful elements such as oxide compound such as the red stone that contains mostly and Tong 、 Arsenic, lead, tin in the steel scrap; And the content of these harmful elements is difficult to confirm that the obnoxious flavour enrichment causes the purity of this kind steel lower simultaneously; As adopt the mode of die casting to produce steel billet, therefore and the spot segregation and the surface quality problems that produce be prone to make steel billet; And adopt the mode of continuous casting to produce steel billet; Though can reduce spot segregation and improve the billet surface quality problems; But thickness owing to the aluminium height in the molten steel; Very easily stop up the mouth of a river of mold and make the covering slag sex change,, cause the raising of bleed-out and production cost so make the stove number of continuous casting be less than 4 stoves usually.
For addressing the above problem, another kind of solution is the operation that on the basis of adopting electric arc furnace, increases external refining in the prior art, is about to molten steel in the electric arc furnace and packs into and carry out refining in the LF stove.Though external refining can be adjusted molten steel composition and temperature thereof, add aluminium and can realize deoxidization desulfuration, it can not remove gas and inclusion in the molten steel, and then causes spot segregation, deficiencies such as steel quality difference, and the production cost of steel billet is improved.
Though vacuum oven all has configuration at many metallurgy industries; And vacuum oven is to make the mode of Molten Steel Flow realize outgasing through winding-up argon gas in stove; But because the aluminium quality in the molten steel is light more many than molten steel; So, in the process of Molten Steel Flow, cause aluminium come-up entirely, and the aluminium of come-up with can cause the aluminium loss after slag contacts.Based on this point, prior art for fear of the aluminium loss, does not all adopt the vacuum oven degassing when smelting high aluminum steel, thereby influences the quality of high aluminum steel.
Summary of the invention
Task of the present invention provides and provides a kind of utilization to skim to solve the method for the high aluminum steel of smelting of molten steel quality problems with mode such as vacuum outgas.
The method of the high aluminum steel of smelting proposed by the invention may further comprise the steps:
Electric arc furnace smelting: molten iron and steel scrap are packed in this electric arc furnace, and mass ratio between the two is: molten iron: steel scrap=2:2.5-3.5, smelting temperature be at 1680-1700 ℃, and the weight percent that guarantees carbon content in the molten steel is between 0.10-0.15%.Because the purity of molten iron is usually above steel scrap, so electric arc furnace smelting adds molten iron can reduce oxide compound harmful element in the steel, can improve the purity of molten steel; Simultaneously just have very high temperature, when electric arc furnace smelting, utilize the molten iron temperature can be energy-conservation because of molten iron itself.External refining: will the molten steel behind electric arc furnace smelting sending into ladle refining furnace is in the LF stove; Its smelting temperature is 1570-1650 ℃; Smelt the slag of removing 90-92% in the molten steel after 60-90 minute; In the LF stove, add the aluminium that quality is the 1-1.3% of steel quality again, smelt again and molten steel was changed in the vacuum oven in 15-20 minute.When external refining, add aluminium again after most of slag clawed, can avoid the loss of aluminium effectively, can adjust the molten steel composition effectively, can also adjust molten steel temperature simultaneously, molten steel temperature reaches requirement.Vacuum oven is smelted: will be after LF stove purified molten steel is packed in the vacuum oven; Gas in the extracting vacuum stove, the argon gas of in it, jetting simultaneously makes the vacuum tightness in the vacuum oven reach 30-100Pa; And kept 15-20 minute; Stop the gas in the extracting vacuum stove then, continue to vacuum oven winding-up argon gas 15-20 minute, resulting molten steel is high aluminum steel.But vacuum oven is smelted the gas in the extracting vacuum stove, promptly removes gas such as hydrogen in the molten steel, nitrogen, oxygen and aluminium sesquioxide or the like inclusion, and vacuum tightness does not wherein reach metallurgical effect as greater than 100Pa.
In the said external refining step, after adding aluminium, comprise that also in the LF stove, adding quality is respectively the step of 0.2% fluorite and the lime 0.9% of steel quality.Add the aluminium ingot post precipitation and can realize deoxidization desulfuration, and fluorite and lime (unslaked lime) are slag formers, add aluminium powder after slag forms again and carry out the diffusive deoxidation desulfurization.
In the said electric arc furnace smelting step, the mass ratio between molten iron and the steel scrap is: 2:3.
The high aluminum steel that utilizes the method for the high aluminum steel of smelting proposed by the invention to smelt because of its purity is high, and has been controlled the suitable quantity of slag, particularly passes through vacuum-treat, can remove gas and inclusion in the molten steel, avoids nozzle clogging and strand segregation to be inclined to.Through test in place; When smelting the high aluminum steel that and carry out continuous casting with method of the present invention; 1520 ℃-1535 ℃ of control continuous casting tundish temperatures, during continuous caster casting speed control 0.70-0.90m/min, continuous casting 11 stoves are not found the phenomenon of mold gap dross yet.
Embodiment:
Embodiment 1:
At first molten iron and steel scrap are packed in the electric arc furnace, the mass ratio between molten iron and the steel scrap is: 2:3, and the temperature with electric arc furnace is raised to 1700 ℃ then; When the weight percent of carbon content in the molten steel 0.15% the time, it is to carry out external refining in the LF stove that the molten steel in the electric arc furnace is sent into ladle refining furnace, when the LF furnace temperature reaches 1650 ℃; After continuing 60 minutes again under this temperature, 90% slag in the removal molten steel, in the LF stove, adding quality is the aluminium of the 1-1.3% of steel quality; Smelt after 15 minutes, in the LF stove, adding quality again is respectively 0.2% fluorite and the lime 0.9% of steel quality, smelts after 15 minutes again molten steel is packed in the vacuum oven; When in vacuum oven, smelting, the gas in the extracting vacuum stove makes the vacuum tightness in the vacuum oven reach 100Pa; The argon gas of in it, jetting simultaneously, and kept 15 minutes, the gas in the extracting vacuum stove stopped then; Continuation was to vacuum oven winding-up argon gas 20 minutes, and resulting molten steel is high aluminum steel.
Embodiment 2:
At first molten iron and steel scrap are packed in the electric arc furnace, the mass ratio between molten iron and the steel scrap is: 2:3.5, and the temperature with electric arc furnace is raised to 1680 ℃ then; When the weight percent of carbon content in the molten steel 0.10% the time, it is to carry out external refining in the LF stove that the molten steel in the electric arc furnace is sent into ladle refining furnace, when the LF furnace temperature reaches 1570 ℃; After continuing 90 minutes again under this temperature, 92% slag in the removal molten steel, in the LF stove, adding quality is the aluminium of the 1-1.3% of steel quality; Smelt after 20 minutes, in the LF stove, adding quality again is respectively 0.2% fluorite and the lime 0.9% of steel quality, smelts after 20 minutes again molten steel is packed in the vacuum oven; When in vacuum oven, smelting, the gas in the extracting vacuum stove makes the vacuum tightness in the vacuum oven reach 30Pa; The argon gas of in it, jetting simultaneously, and kept 20 minutes, the gas in the extracting vacuum stove stopped then; Continuation was to vacuum oven winding-up argon gas 15 minutes, and resulting molten steel is high aluminum steel.
Embodiment 3:
At first molten iron and steel scrap are packed in the electric arc furnace, the mass ratio between molten iron and the steel scrap is: 2:2.5, and the temperature with electric arc furnace is raised to 1690 ℃ then; When the weight percent of carbon content in the molten steel 0.12% the time, it is to carry out external refining in the LF stove that the molten steel in the electric arc furnace is sent into ladle refining furnace, when the LF furnace temperature reaches 1600 ℃; After continuing 70 minutes again under this temperature, 91% slag in the removal molten steel, in the LF stove, adding quality is the aluminium of the 1-1.3% of steel quality; Smelt after 17 minutes, in the LF stove, adding quality again is respectively 0.2% fluorite and the lime 0.9% of steel quality, smelts after 18 minutes again molten steel is packed in the vacuum oven; When in vacuum oven, smelting, the gas in the extracting vacuum stove makes the vacuum tightness in the vacuum oven reach 65Pa; The argon gas of in it, jetting simultaneously, and kept 17 minutes, the gas in the extracting vacuum stove stopped then; Continuation was to vacuum oven winding-up argon gas 17 minutes, and resulting molten steel is high aluminum steel.
Claims (3)
1. smelt the method for high aluminum steel, it is characterized in that may further comprise the steps:
Electric arc furnace smelting: molten iron and steel scrap are packed in this electric arc furnace, and mass ratio between the two is: molten iron: steel scrap=2:2.5-3.5, smelting temperature be at 1680-1700 ℃, and the weight percent that guarantees carbon content in the molten steel is between 0.10-0.15%;
External refining: will the molten steel behind electric arc furnace smelting sending into ladle refining furnace is in the LF stove; Its smelting temperature is 1570-1650 ℃; Smelt the slag of removing 90-92% in the molten steel after 60-90 minute; In the LF stove, add the aluminium that quality is the 1-1.3% of steel quality again, smelt again and molten steel changed in the vacuum oven in 15-20 minute;
Vacuum oven is smelted: will be after LF stove purified molten steel is packed in the vacuum oven; Gas in the extracting vacuum stove, the argon gas of in it, jetting simultaneously makes the vacuum tightness in the vacuum oven reach 30-100Pa; And kept 15-20 minute; Stop the gas in the extracting vacuum stove then, continue to vacuum oven winding-up argon gas 15-20 minute, resulting molten steel is high aluminum steel.
2. method according to claim 1 is characterized in that: in the said external refining step, after adding aluminium, comprise that also in the LF stove, adding quality is respectively the step of 0.2% fluorite and the lime 0.9% of steel quality.
3. method according to claim 1 is characterized in that: in the said electric arc furnace smelting step, the mass ratio between molten iron and the steel scrap is: 2:3.
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| CN2010106139378A CN102051439B (en) | 2010-12-30 | 2010-12-30 | Method for smelting high aluminium steel |
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| CN2010106139378A CN102051439B (en) | 2010-12-30 | 2010-12-30 | Method for smelting high aluminium steel |
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| CN102051439B true CN102051439B (en) | 2012-12-05 |
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| CN103014221B (en) * | 2012-12-17 | 2015-04-08 | 莱芜钢铁集团有限公司 | Method for producing high-aluminum steel plate blanks |
| CN105154623B (en) * | 2015-07-30 | 2017-03-15 | 达力普石油专用管有限公司 | A kind of efficient alloyage process of melting 38CrMoAl steel |
| CN110385411B (en) * | 2019-08-19 | 2021-02-26 | 中天钢铁集团有限公司 | Method for preventing high-aluminum cold heading steel continuous casting nodulation |
| CN112267006A (en) * | 2020-10-20 | 2021-01-26 | 新疆八一钢铁股份有限公司 | Method for reducing inclusion nodule rate in continuous casting of door plate steel |
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| CN1235703C (en) * | 2004-04-20 | 2006-01-11 | 南京钢铁联合有限公司 | Technique for manufacturing bearing steel |
| CN100372948C (en) * | 2005-04-22 | 2008-03-05 | 涟源钢铁集团有限公司 | Low-silicon low-carbon aluminium full killed steel refining method |
| CN101376915B (en) * | 2008-09-29 | 2010-11-03 | 山西太钢不锈钢股份有限公司 | Method for smelting high-alumina non-magnetic steel |
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Effective date of registration: 20221108 Address after: 117000 No. 16 Renmin Road, Pingshan District, Liaoning, Benxi Patentee after: BENGANG STEEL PLATES Co.,Ltd. Patentee after: BENXI STEEL (GROUP) INFORMATION AUTOMATION CO.,LTD. Address before: 117000 No. 16 Renmin Road, Pingshan District, Liaoning, Benxi Patentee before: BENGANG STEEL PLATES Co.,Ltd. |
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