CN102051435A - Method for smelting low-carbon aluminium-killed steel and method for continuously casting low-carbon aluminium-killed steel - Google Patents
Method for smelting low-carbon aluminium-killed steel and method for continuously casting low-carbon aluminium-killed steel Download PDFInfo
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- CN102051435A CN102051435A CN2009102114326A CN200910211432A CN102051435A CN 102051435 A CN102051435 A CN 102051435A CN 2009102114326 A CN2009102114326 A CN 2009102114326A CN 200910211432 A CN200910211432 A CN 200910211432A CN 102051435 A CN102051435 A CN 102051435A
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Abstract
The invention provides a method for smelting low-carbon aluminium-killed steel, comprising the following steps: carrying out primary smelting by adopting a converter top and bottom combined blowing way, and then tapping molten steel obtained by the primary smelting into a steel ladle; blocking slag and predeoxidising in the tapping process, wherein the slag is blocked to ensure that the total content of FeO and MnO which enter the steel ladle is 3-5wt% of the molten steel entering the steel ladle, and the predeoxidising operation comprises the step of adding ferro-aluminium deoxidizer into the molten steel and can ensure that the oxygen content of the molten steel is 10-100ppm; carrying out primary aluminium feeding on the molten steel in the steel ladle before the molten steel in the steel ladle is refined after tapping is completed; refining the molten steel after the primary aluminium feeding is completed, and carrying out secondary aluminium feeding in the refining process; and removing impurities floating on the liquid surface of the molten steel. The invention also provides a method for continuously casting the low-carbon aluminium-killed steel, comprising the following steps: pouring the molten steel obtained by adopting the method for smelting the low-carbon aluminium-killed steel into a crystallizer, and continuously pulling and cooling. By adopting the method for smelting the low-carbon aluminium-killed steel, the purity of the molten steel can be obviously improved, and the accretion in the continuous casting process can be reduced.
Description
Technical field
The present invention relates to the method for smelting low carbon aluminium killed steel and the method for continuous casting carbon aluminium-killed steel.
Background technology
Continuous casting is the present steel casting technology that generally adopts, and particularly, will refine good molten steel (be poured in the tundish and (can adorn tens tons of molten steel)), and liquid molten steel vertically flows in the crystallizer that failure of oscillation moves by the aperture under the tundish.Crystallizer external application high pressure water does not stop cooling, and molten steel forms the outside in crystallizer be solid-state, inner still liquid form.Crystallizer is outward one section arcual cooling roller bed, spurs strand and make strand all be become solid-state strand through the water-cooled district with air cooling zone successively on this cooling roller bed.
During the continuous casting carbon aluminium-killed steel, the inclusion in the molten steel forms dross at sprue gate easily, has had a strong impact on molten steel flow speed and has made the pulling rate of continuous casting produce very big fluctuation, influences continuous casting production and slab quality.It is Al that the dross owner who extracts at place, the continuous casting mouth of a river wants composition
2O
3(more than the 91 weight %).Because the molten steel of carbon aluminium-killed steel tapping back uses the ferro-aluminum reductor to carry out pre-deoxidation, uses alumina-bearing material to carry out deep deoxidation then, promptly feeds aluminium to the carbon aluminium-killed steel molten steel in the tundish.Pre-deoxidation and deep deoxidation all can form infusible Al in molten steel
2O
3, and then be mingled with or be suspended in the molten steel and with MOLTEN STEEL FLOW.In addition since the slag in the ladle of tapping for example FeO, MnO oxidisability are very strong, in casting process, the oxygen in the slag in molten steel, transmits and with molten steel in aluminium react, thereby in molten steel upper strata generation numerous Al
2O
3, these Al
2O
3Also be to cause the major cause of molten steel in cast later stage nozzle clogging.
Summary of the invention
The invention provides and a kind ofly can improve the molten steel purity and reduce the method for smelting low carbon aluminium killed steel of dross in the casting process and the method for continuous casting carbon aluminium-killed steel.
The method of smelting low carbon aluminium killed steel of the present invention comprises: use the converter top bottom blowing to carry out refining just, will just refine the molten steel that obtains then and tap in the ladle; In tapping process, carry out pushing off the slag and pre-deoxidation, pushing off the slag makes and to enter the FeO of ladle and the total content of MnO is the 3-5 weight % that enters the amount of the molten steel in the ladle, described pre-deoxidation is to add the ferro-aluminum reductor in molten steel, and described pre-deoxidation makes that the oxygen level of molten steel is 10-100ppm; After tapping the molten steel in the ladle is carried out before the refining, the molten steel in the ladle is carried out once feeding aluminium, the described aluminium of once feeding be to molten steel hello aluminium after tapping; Described molten steel of once feeding behind the aluminium is carried out refining and carries out secondary when the refining and feed aluminium; Removal swims in the inclusion on the liquid steel level.
The method of continuous casting carbon aluminium-killed steel of the present invention will the method by smelting low carbon aluminium killed steel of the present invention smelt the pouring molten steel that obtain to crystallizer to be spurred continuously and to be cooled off.
The oxygen level of molten steel when using the method for smelting low carbon aluminium killed steel of the present invention significantly to reduce refining, thus the Al that produces when aluminium is fed in refining reduced
2O
3When tapping,, therefore, use the method for smelting low carbon aluminium killed steel of the present invention can improve the purity of molten steel and significantly reduce dross, thereby the pulling rate of stabilizing continuous casting improve the continuous casting quality of production by the quantity of slag under the pushing off the slag minimizing.
Embodiment
The method of smelting low carbon aluminium killed steel of the present invention comprises: use the converter top bottom blowing to carry out refining just, will just refine the molten steel that obtains then and tap in the ladle; In tapping process, carry out pushing off the slag and pre-deoxidation, pushing off the slag makes and to enter the FeO of ladle and the total content of MnO is the 3-5 weight % that enters the amount of the molten steel in the ladle, described pre-deoxidation is to add the ferro-aluminum reductor in molten steel, and described pre-deoxidation makes that the oxygen level of molten steel is 10-100ppm; After tapping the molten steel in the ladle is carried out before the refining, the molten steel in the ladle is carried out once feeding aluminium, the described aluminium of once feeding be to molten steel hello aluminium after tapping; Described molten steel of once feeding behind the aluminium is carried out refining and carries out secondary when the refining and feed aluminium; Removal swims in the solid on the liquid steel level.
Because carbon aluminium-killed steel all is to carry out deoxidation by the aluminium in the deoxidation material, therefore, the dross that occurs during the continuous casting carbon aluminium-killed steel all is Al basically
2O
3Cause, carbon aluminium-killed steel all is suitable for the method for smelting low carbon aluminium killed steel of the present invention.
At first, can reduce the oxygen level of tapping molten steel by the converter top bottom blowing, top-bottom blowing can be strengthened the molten bath and stir, and promotes steel-slag surface reaction, and reaction more approaches equilibrium state, so reduced the excess oxygen content in molten steel and the slag significantly.The converter top bottom blowing is a converter steel making method well known in the art, and therefore, the present invention does not elaborate at this.
Preferably, described converter top bottom blowing is top blast oxygen, bottom blowing shielding gas, top blast oxygen 20000-30000 standard cubic meter/hour, the intensity of bottom blowing shielding gas is 0.015-0.045Nm
3/ ton molten steel min.For example, can switch to bottom blowing rare gas element (for example argon gas) in the blowing later stage at blowing bottom blowing inactive gas (for example nitrogen) in early stage.In addition, described converter top bottom blowing also comprises tapping back bottom blowing 6-10min argon gas, and intensity is 0.1-3Nm
3/ ton molten steel min stirs before strengthening the preceding terminal point of tapping, thereby further reduces the oxygen level of tapping molten steel.
Secondly, produce Al for hyperoxia voltinism slag and the reactive aluminum in the molten steel that reduces in the ladle
2O
3, can remove most of hyperoxia voltinism slag by the pushing off the slag mouth in when tapping, make to enter the slag FeO of ladle and the content of MnO is the 3-5% that enters the amount of the molten steel in the ladle, thereby reduce the Al of oxygen and the generation of the reactive aluminum in the molten steel in the invar slag
2O
3Amount.Particularly, the pushing off the slag mouth is arranged on the position a little less than liquid steel level, blocks and makes molten steel pass through from pushing off the slag mouth below thereby will swim in slag on the liquid steel level.
Simultaneously, in tapping process, carry out pre-deoxidation, make that the oxygen level of molten steel is 10-100ppm by in molten steel, adding ferro-aluminum reductor (Al content is 40-80 weight %).Because pre-deoxidation is to carry out in tapping process, the Al that pre-deoxidation forms
2O
3Have to float to molten steel surface on the time enough, be easy to remove.Preferably, the ferro-aluminum reductor of pre-deoxidation adding is a 0.1-1kg/ ton molten steel.
Because top-bottom blowing reduces the oxygen level in the tapping molten steel greatly, pre-deoxidation further makes the molten steel oxygen level in the ladle descend, and therefore, can reduce and feed the Al that aluminium produced to the molten steel in the ladle of tapping
2O
3Feed aluminium 0.1-1kg/ ton molten steel to molten steel when preferably, once feeding aluminium.More preferably, can carry out once feeding aluminium ladle being transported to the argon station of passing through the process of refining furnace from converter, thereby utilize the Argon at argon station to stir.
In addition, secondary can blow argon gas after feeding aluminium, thereby molten steel is carried out weakly stirring and preventing that molten steel is exposed, so that molten steel suitably seethes, thereby makes the even deoxidation of molten steel and makes the Al of generation
2O
3Swim on the liquid steel level, so that from molten steel, remove.Preferably, the intensity that blows argon gas is 1Nm
3/ ton molten steel min, the time of blowing is 6-10min.
In addition, once feed the aluminium that in molten steel, adds when aluminium and secondary are fed aluminium and can be aluminum steel or aluminum shot.Though pre-deoxidation, once feed aluminium and secondary and feed the oxygen level that aluminium can reduce molten steel, but molten steel is in tapping process and be contained in the ladle can touch the oxygen in the outside atmosphere the process that is transported to argon station and refining furnace from converter, and the oxygen level in the molten steel can not keep.Therefore, preferably, can make that oxygen level is 2-30ppm in the molten steel by once feeding aluminium.At once feeding the variation that aluminium and secondary are fed molten steel oxygen level between the aluminium, can feed aluminium by secondary and make that oxygen level is 2-20ppm in the molten steel.
Before pouring into a mould can with on the inclusion that floats on the liquid steel level (mainly be solid Al
2O
3) remove, thereby avoid Al
2O
3Pour into a mould with molten steel.
Preferably, carry out described pre-deoxidation when tapping 1/3-3/4, tapping back 2-20min carries out refining, thus the Al that pre-deoxidation is formed
2O
3Have on the enough time and float on the liquid steel level.
The method of continuous casting carbon aluminium-killed steel of the present invention will the method by smelting low carbon aluminium killed steel of the present invention smelt the pouring molten steel that obtain to crystallizer to be spurred continuously and to be cooled off.The present invention is primarily aimed at smelting process and improves, and other operation is for example poured into a mould, pulling etc. is method well known in the art, do not elaborate at this.Preferably, molten steel or steel billet secondary oxidation when preventing continuous casting, in the Pour Steel process and steel billet by in pulling, the process of cooling continuously, provide protection of inert gas to molten steel and steel billet.
The advantage of the method for the method of smelting low carbon aluminium killed steel of the present invention and continuous casting carbon aluminium-killed steel is described below by specific embodiment.
Embodiment 1
Top blast pure oxygen 20000-30000 standard cubic meter during top-bottom blowing/hour, bottom blowing pure argon intensity 0.015-0.045Nm
3/ ton molten steel min, argon bottom-blowing 6-10min after tapping, intensity is 0.1-3Nm
3/ ton molten steel min, to strengthen stirring before tapping, the molten steel oxygen level is 100-600ppm when making tapping; During tapping pushing off the slag make the total content of FeO and MnO be 3 weight % and the ferro-aluminum reductor (Al content is 45 weight %) that added 1kg/ ton molten steel at 1/3 o'clock in tapping to carry out pre-deoxidation, make that the molten steel oxygen level is 10-50ppm; Carry out once feeding aluminium 0.3kg/ ton molten steel at the argon station behind the tapping 5min, make that the molten steel oxygen level is 2-10ppm, Argon intensity is 0.4Nm
3/ ton molten steel min, the time is 6min; Refining obtains C 0.02-0.07 weight % to molten steel through the LF stove, O 2-10ppm, Al 0.03-0.06 weight %, Si 0-0.04 weight %, the Stb32 molten steel of Mn 0.25-0.30 weight %, wherein secondary is fed aluminium 0.1kg/ ton molten steel during the refining of LF stove, blows argon gas to molten steel, Argon intensity 0.3Nm after feeding aluminium
3/ ton molten steel min, time 6min; This pouring molten steel is carried out continuous casting and argon shield is provided in casting process in crystallizer.
Embodiment 2
Method according to embodiment 1 is carried out continuous casting, difference is, during tapping pushing off the slag make the total content of FeO and MnO be 3.6% and the ferro-aluminum reductor (Al content is 60 weight %) that added 0.7kg/ ton molten steel at 1/2 o'clock in tapping to carry out pre-deoxidation, make that the molten steel oxygen level is 60-100ppm; Tapping back 2min carries out once feeding aluminium 0.1kg/ ton molten steel, makes that the molten steel oxygen level is 10-30ppm; Refining obtains C 0.02-0.05% to molten steel through the LF stove, O 2-10ppm, and Al 0.05-0.06%, Si 0-0.03%, the Stb34 molten steel of Mn0.20-0.25%, wherein secondary is fed aluminium 0.5kg/ ton molten steel during the refining of LF stove.
Embodiment 3
Method according to embodiment 1 is carried out continuous casting, difference is, during tapping pushing off the slag make the total content of FeO and MnO be 4% and the ferro-aluminum reductor (Al content is 65 weight %) that added 1kg/ ton molten steel at 3/4 o'clock in tapping to carry out pre-deoxidation, make that the molten steel oxygen level is 30-60ppm; Tapping back 15min carries out once feeding aluminium 0.8kg/ ton molten steel, makes that the molten steel oxygen level is 10-30ppm; Refining obtains C 0.02-0.07 weight % to molten steel through the LF stove, O 2-10ppm, and Al 0.03-0.06 weight %, Si 0-0.04 weight %, the Stb32 molten steel of Mn 0.25-0.30 weight %, wherein secondary is fed aluminium 1kg/ ton molten steel during the refining of LF stove.
Embodiment 4
Method according to embodiment 1 is carried out continuous casting, difference is, during tapping pushing off the slag make the total content of FeO and MnO be 5% and the ferro-aluminum reductor (Al content is 80 weight %) that added 0.6kg/ ton molten steel at 1/2 o'clock in tapping to carry out pre-deoxidation, make that the molten steel oxygen level is 50-100ppm; Tapping back 2min carries out once feeding aluminium 0.1kg/ ton molten steel, makes that the molten steel oxygen level is 10-30ppm; Refining obtains C 0.02-0.07 weight % to molten steel through the LF stove, O 2-10ppm, and Al 0.03-0.06 weight %, Si 0-0.04 weight %, the Stb32 molten steel of Mn 0.25-0.30 weight %, wherein secondary is fed aluminium 1kg/ ton molten steel during the refining of LF stove.
Comparative Examples 1
During tapping pushing off the slag make the total content of FeO and MnO be 8.9% and the ferro-aluminum reductor (Al content is 45 weight %) that added 1kg/ ton molten steel at 1/3 o'clock in tapping to carry out pre-deoxidation, make that the molten steel oxygen level is 150-200ppm; Tapping back 5min carries out once feeding aluminium 0.2kg/ ton molten steel, makes that the molten steel oxygen level is 30-50ppm; Refining obtains C 0.03-0.07%, O 2-10ppm, Al0.05-0.08% to molten steel through the LF stove, Si 0-0.05%, the Stb32 molten steel of Mn 0.025-0.035%, secondary is fed aluminium 1kg/ ton molten steel during the refining of LF stove, blow argon gas to tundish, Argon intensity 1Nm after feeding aluminium
3/ ton molten steel min, time 6-10min.
The continuous casting pulling rate situation of the molten steel that the method for embodiment 1-4 and Comparative Examples 1 obtains is as shown in table 1.Sequence number 1-4 represents embodiment 1-4 respectively, sequence number 5 expression Comparative Examples 1.
Wherein, v1, v2, v3 and v4 are respectively the pulling rates when continuous casting 5min, 10min, 25min and 35min, and the unit of v1, v2, v3 and v4 is m/min; Basket pouring stove number is meant the heat quantity that each tundish can be poured into a mould.
Table 1
| Sequence number | v1 | v2 | v3 | v4 | Basket pouring stove number |
| 1 | 1.2 | 1.4 | 1.5 | 1.4 | 10 |
| 2 | 1.3 | 1.5 | 1.5 | 1.4 | 10 |
| 3 | 1.3 | 1.4 | 1.4 | 1.3 | 10 |
| 4 | 1.4 | 1.3 | 1.5 | 1.5 | 9.5 |
| 5 | 1.0 | 1.5 | 1.3 | 0.8 | 8 |
By refined molten steel composition in the foregoing description and the Comparative Examples as can be seen, the tundish table 1 of embodiment 1-4 oxygen level as can be seen significantly is lower than Comparative Examples 1, illustrates that the aluminium add-on of increase has been sloughed the most of oxygen in the molten steel.In addition, the pushing off the slag amount of embodiment 1-4 also significantly greater than Comparative Examples 1, that is to say, FeO and MnO major part that the oxygen in the water of just making steel forms are removed in the pushing off the slag operation.In addition, a deoxidation makes the oxygen level of molten steel significantly descend, the Al that makes deoxidation formation
2O
3Have to float on the liquid steel level and before cast on the enough time and remove.Therefore the fluctuation of the continuous casting pulling rate of embodiment 1-4 is littler, and the continuous casting pulling rate is more stable, counts height thereby improve the basket pouring stove.This shows that the method for smelting low carbon aluminium killed steel of the present invention can improve the molten steel purity effectively and obtain stable continuous casting pulling rate.
Claims (10)
1. the method for a smelting low carbon aluminium killed steel, this method comprises:
Use the converter top bottom blowing to carry out refining just, will just refine the molten steel that obtains then and tap in the ladle;
In tapping process, carry out pushing off the slag and pre-deoxidation, pushing off the slag makes and to enter the FeO of ladle and the total content of MnO is the 3-5 weight % that enters the amount of the molten steel in the ladle, described pre-deoxidation is to add the ferro-aluminum reductor in molten steel, and described pre-deoxidation makes that the oxygen level of molten steel is 10-100ppm;
After tapping, the molten steel in the ladle is carried out before the refining, the molten steel in the ladle is carried out once feeding aluminium;
Described molten steel of once feeding behind the aluminium is carried out refining and carries out secondary when the refining and feed aluminium;
Removal swims in the solid on the liquid steel level.
2. the method for smelting low carbon aluminium killed steel according to claim 1; wherein; described converter top bottom blowing is top blast oxygen, bottom blowing shielding gas, an oxygen blast gas 20000-30000 standard cubic meter/hour, the intensity of bottom blowing shielding gas is 0.015-0.045Nm
3/ ton molten steel min.
3. the method for smelting low carbon aluminium killed steel according to claim 2, wherein, described shielding gas is rare gas element and/or nitrogen.
4. according to the method for any described smelting low carbon aluminium killed steel among the claim 1-3, wherein, carry out described pre-deoxidation when tapping 1/3-3/4,2-20min carries out the described aluminium of once feeding after the pre-deoxidation.
5. the method for smelting low carbon aluminium killed steel according to claim 4, wherein, the ferro-aluminum reductor that described pre-deoxidation adds is a 0.1-1kg/ ton molten steel.
6. the method for smelting low carbon aluminium killed steel according to claim 1, wherein, the described aluminium of once feeding makes that oxygen level is 2-30ppm in the molten steel, secondary is fed aluminium and is made that oxygen level is 2-20ppm in the molten steel.
7. the method for smelting low carbon aluminium killed steel according to claim 6 wherein, is describedly fed aluminium 0.1-1kg/ ton molten steel to molten steel when once feeding aluminium, feeds aluminium 0.1-1kg/ ton molten steel to molten steel when secondary is fed aluminium.
8. the method for smelting low carbon aluminium killed steel according to claim 1, wherein, described method blows argon gas after also being included in refining, and the intensity that blows argon gas is 0.1-3Nm
3/ steel min, the time of blowing is 6-10min.
9. the method for a continuous casting carbon aluminium-killed steel, this method comprise pouring molten steel that smelting is obtained in the crystallizer to be spurred continuously and to be cooled off, it is characterized in that the molten steel of the molten steel that described smelting obtains for obtaining by method according to any described smelting low carbon aluminium killed steel among the claim 1-8.
10. the method for continuous casting carbon aluminium-killed steel according to claim 9, wherein, in the Pour Steel process and steel billet by in continuously pulling, the process of cooling, provide protection of inert gas to prevent molten steel or steel billet secondary oxidation to molten steel and steel billet.
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| CN102248142A (en) * | 2011-06-30 | 2011-11-23 | 攀钢集团有限公司 | Method for producing medium and low carbon aluminum killed steel |
| CN102534118A (en) * | 2011-12-07 | 2012-07-04 | 鞍钢股份有限公司 | Method for reducing flocculating flows of low silicon aluminum killed steel |
| CN103045930A (en) * | 2013-01-06 | 2013-04-17 | 唐山建龙实业有限公司 | Deoxidation alloying production process for low-carbon aluminum killed steel |
| CN105499526A (en) * | 2014-09-25 | 2016-04-20 | 鞍钢股份有限公司 | Method for reducing total oxygen content of aluminium-killed steel continuous cast first slab |
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| CN106811694A (en) * | 2015-11-28 | 2017-06-09 | 唐山市丰润区天鑫金属制品有限公司 | A kind of preparation technology of the raw material with the anti-rotten steel of alloy composition |
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| CN102248142B (en) * | 2011-06-30 | 2013-05-08 | 攀钢集团有限公司 | Method for producing medium and low carbon aluminum killed steel |
| CN102248142A (en) * | 2011-06-30 | 2011-11-23 | 攀钢集团有限公司 | Method for producing medium and low carbon aluminum killed steel |
| CN102534118A (en) * | 2011-12-07 | 2012-07-04 | 鞍钢股份有限公司 | Method for reducing flocculating flows of low silicon aluminum killed steel |
| CN102534118B (en) * | 2011-12-07 | 2015-09-02 | 鞍钢股份有限公司 | A kind of method reducing low silicon aluminium killed steel wadding stream |
| CN103045930A (en) * | 2013-01-06 | 2013-04-17 | 唐山建龙实业有限公司 | Deoxidation alloying production process for low-carbon aluminum killed steel |
| CN105499526A (en) * | 2014-09-25 | 2016-04-20 | 鞍钢股份有限公司 | Method for reducing total oxygen content of aluminium-killed steel continuous cast first slab |
| CN106811694A (en) * | 2015-11-28 | 2017-06-09 | 唐山市丰润区天鑫金属制品有限公司 | A kind of preparation technology of the raw material with the anti-rotten steel of alloy composition |
| CN106011379B (en) * | 2016-08-02 | 2019-02-12 | 芜湖新兴铸管有限责任公司 | The method of deoxidation of cold-forging steel |
| CN106011379A (en) * | 2016-08-02 | 2016-10-12 | 芜湖新兴铸管有限责任公司 | Deoxidizing method for cold forging steel |
| CN111440981A (en) * | 2018-01-31 | 2020-07-24 | 日照钢铁控股集团有限公司 | Low-carbon silicon-aluminum-control killed clean steel process |
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| CN110144433B (en) * | 2019-07-03 | 2021-03-19 | 马鞍山钢铁股份有限公司 | Deoxidation slagging method of low-carbon aluminum killed steel |
| CN112267000A (en) * | 2020-10-20 | 2021-01-26 | 新疆八一钢铁股份有限公司 | Short-flow process for producing low-carbon low-silicon aluminum killed steel |
| CN115261702A (en) * | 2021-04-29 | 2022-11-01 | 宝山钢铁股份有限公司 | Smelting method of hot-rolled spring steel and hot-rolled spring steel prepared by same |
| CN115261702B (en) * | 2021-04-29 | 2023-08-11 | 宝山钢铁股份有限公司 | Smelting method of hot-rolled spring steel and hot-rolled spring steel prepared by smelting method |
| CN115505682A (en) * | 2022-09-14 | 2022-12-23 | 马鞍山钢铁股份有限公司 | Method for shortening smelting time of low-carbon aluminum killed steel LF furnace |
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Application publication date: 20110511 |