CN103911490B - The method of Ultra-low carbon Glassed Steel molten steel nitrogen pick-up - Google Patents
The method of Ultra-low carbon Glassed Steel molten steel nitrogen pick-up Download PDFInfo
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Abstract
The invention belongs to technical field of ferrous metallurgy, the method for particularly a kind of Ultra-low carbon Glassed Steel molten steel nitrogen pick-up, utilize nitrogen carry out decarburization as lift gas and control lift gas flow at 150-170Nm
3between/h, bleed, make the vacuum tightness of decarbonizing furnace be not more than 100Pa; Gradually lift gas flow is carried to 210-230Nm
3/ h, decarbonizing furnace vacuum tightness is not more than 1kPa, until carbon period terminates when in molten steel, carbon content is not more than 20ppm; Carry out deoxidation operation, add alloy and control lift gas flow at 160-180Nm
3/ h or 200-220Nm
3in the corresponding interval of/h, vacuum breaker after meeting Ultra-low carbon Glassed Steel composition to molten steel.Making to carry out nitrogen pick-up at de-carbon by controlling the lift gas flow of nitrogen in decarburization and deoxidization technique, decarbonizing furnace vacuum tightness size and decarburization time simultaneously, finished product nitrogen content can be controlled accurately; Reduce the use of alloy, reduce costs.
Description
Technical field
The invention belongs to technical field of ferrous metallurgy, the method for particularly a kind of Ultra-low carbon Glassed Steel molten steel nitrogen pick-up.
Background technology
Nitrogen is easily combined with the element such as Al, Ti, Nb, B and forms compound, when nitrogen to be combined with B element form boron nitride time, understand the effect that cannot play nitrogen, and formation of crack when increase is out of shape.Therefore, for most of steel grade, nitrogen belongs to harmful element, needs to reduce its content in smelting process as far as possible.But for Ultra-low carbon Glassed Steel, not only need deep drawability, and in order to ensure enough second phase particles, meet the antiknock requirements of this steel grade, need the titanium of nitrogen in steel to be combined and form nitride, and then need to carry out molten steel nitrogen pick-up in the process of smelting, and need to control finished product nitrogen content comparatively accurately.
At present, the difference according to production technique can carry out nitrogen pick-up by two kinds of modes to molten steel.The nitrogen pick-up of first alloy, adopts this kind of technique to carry out nitrogen pick-up operation and can obtain stable nitrogen increased amount, but in the process of adding alloy and sampling analysis nitrogen in steel content, along with the circulation of molten steel, the nitrogen in molten steel can constantly loss.Cause the addition being difficult to accurately calculate alloy and the cycling time of adding after alloy, and then be difficult to the nitrogen content accurately controlling finished product.Meanwhile, the interpolation of alloy also can increase production cost.Another kind of mode is for using nitrogen to carry out nitrogen pick-up as lift gas to molten steel by RH.Its operation without the need to adding extras, but vacuum tightness and lift gas flow very large to the influential effect of molten steel nitrogen pick-up.In addition, also need to ensure normally carrying out and requirement to purity aspect of molten steel carbon rejection process, suitable control need be carried out to vacuum system, to make nitrogen pick-up activity duration, refining cycle and continuous casting rhythm match.This is difficult to realize in actually operating, and then makes nitrogen increased amount unstable.
The patent No.: 201110235702.4-low cost RH molten steel nitrogen pick-up control nitrogen technique, converter tapping adopts deoxidation alloying, tapping process adds ferro-vanadium by steel grade target value and joins vanadium, ladle furnace carries out molten steel heating, alloy fine setting and dark desulfurization process by normal process, after molten steel winches to RH stove, RH stove lift gas is set to nitrogen, flow controls according to 800-1200NL/min, vacuumize treatment time 8-10min, carry out normal line feeding, soft blow operation after vacuum terminates, reach nitrogen in steel content in 80-120ppm level.The present invention is by Some substitute VN alloy and substitute argon gas at refining stage nitrogen, reduces production cost, but still the problem that unresolved nitrogen pick-up activity duration, refining cycle and continuous casting rhythm match.
Summary of the invention
Technical problem to be solved by this invention is to provide the method for a kind of Ultra-low carbon Glassed Steel molten steel nitrogen pick-up, to realize when not weakening molten steel decarburization effect and to when requiring in purity etc., stablize finished product nitrogen content, nitrogen pick-up activity duration, refining cycle and continuous casting rhythm are matched.
For solving the problems of the technologies described above, the invention provides the method for a kind of Ultra-low carbon Glassed Steel molten steel nitrogen pick-up, molten iron converter is smelted to decarbonizing furnace, at carbon period, utilize nitrogen carry out decarburization as lift gas and control lift gas flow at 150-170Nm
3between/h, meanwhile control vacuum system and bleed, make the vacuum tightness of described decarbonizing furnace be not more than 100Pa; After the vacuum tightness of described decarbonizing furnace is not more than 100Pa, lift gas flow is to 210-230Nm gradually
3/ h also maintains, and reaches 210-230Nm at described lift gas flow
3the vacuum tightness controlling described decarbonizing furnace during/h is not more than 1kPa; When carbon content is not more than 20ppm in the molten steel in described decarbonizing furnace, controls described carbon period and terminate; Add aluminum shot and carry out deoxidation operation, then add alloy according to described Ultra-low carbon Glassed Steel composition and control lift gas flow at 160-180Nm
3/ h or 200-220Nm
3in the interval that/h is corresponding, until the molten steel in described decarbonizing furnace meets vacuum breaker after described Ultra-low carbon Glassed Steel composition.
Further, the described nitrogen that utilizes carries out decarburization as lift gas and controls lift gas flow at 150-170Nm
3also comprise between/h and carry out thermometric and determine oxygen operating to described molten iron, and according to the data selection nature decarburization pattern recorded or pressure deoxidation pattern.
Further, the time that described carbon period is corresponding equals decarburization time, after described decarburization time, carbon period molten steel nitrogen increased amount, deoxidation to vacuum breaker time, deoxidation to the relation between vacuum breaker nitrogen increased amount and the total nitrogen increased amount of molten steel by following formulate: carbon period molten steel nitrogen increased amount=denitrogenation time * 0.93ppm; Described control lift gas flow is at described 160-180Nm
3when/h is interval, after deoxidation to vacuum breaker nitrogen increased amount=deoxidation to vacuum breaker time * 2.5ppm; Described control lift gas flow is at described 200-220Nm
3when/h is interval, after deoxidation to vacuum breaker nitrogen increased amount=deoxidation to vacuum breaker time * 3.3ppm; To vacuum breaker nitrogen increased amount after the total nitrogen increased amount of molten steel=carbon period molten steel nitrogen increased amount+deoxidation.
Further, the vacuum tightness of the described decarbonizing furnace of described control is not more than time corresponding to 1kPa is between 5-8min.
Further, when in the molten steel in described decarbonizing furnace, carbon content is not more than 20ppm, [O]: 800ppm in the molten steel at the end of controlling described carbon period in described decarbonizing furnace, [C]: 0.025-0.04%, the temperature of described decarbonizing furnace is at 1670-1690 DEG C.
Further, carbon content in the molten steel in described decarbonizing furnace is down to is not more than time corresponding to 20ppm between 15-18min.
Further, interpolation aluminum shot carries out controlling vacuum pump after deoxidation operation comprises deoxidation and makes vacuum tightness between 4-7kPa, adds aluminum shot and carries out deoxidation, and adds ferromanganese and ferrotianium after interpolation aluminum shot 2min.
Further, meeting each Ingredient percent in the molten steel in the described decarbonizing furnace of described Ultra-low carbon Glassed Steel composition is: [C] <0.003, [Mn]: 0.11-0.15, [P]: <0.012, [S]: 0.020-0.030, [Ti]: 0.08-0.12, [Al]: 0.020-0.045, [N]: 0.0060-0.0120, all the other are Fe and inevitable impurity.
Further, described alloy is that ferromanganese is with ∕ or ferrotianium etc.
Relative to prior art, the method of a kind of Ultra-low carbon Glassed Steel molten steel provided by the invention nitrogen pick-up, make to carry out nitrogen pick-up while de-carbon by controlling carbon content and decarburization time in the molten steel in the lift gas flow of nitrogen in decarburization and deoxidization technique, the vacuum tightness size of decarbonizing furnace, decarbonizing furnace, and finished product nitrogen content can be controlled accurately, to be specially lift gas flow in 5-8min by 150-170Nm
3numerical value between/h is promoted to 210-230Nm3/h gradually, and vacuum tightness is down to below 100Pa, and when being maintained until that in the molten steel in decarbonizing furnace, carbon content is not more than 20ppm, carries out nitrogen pick-up to special value while making not affect decarburization; In addition, by controlling vacuum tightness size, utilize the lift gas flow and appropriate alloy that change by molten steel nitrogen pick-up to target value; And by setting decarburization and deoxidization technique in the lift gas flow of nitrogen, the vacuum tightness size of decarbonizing furnace and decarburization time, make carbon period molten steel nitrogen increased amount=denitrogenation time * 0.93ppm; Control lift gas flow at 160-180Nm
3when/h is interval, after deoxidation to vacuum breaker nitrogen increased amount=deoxidation to vacuum breaker time * 2.5ppm; Control lift gas flow at 200-220Nm
3when/h is interval, after deoxidation to vacuum breaker nitrogen increased amount=deoxidation to vacuum breaker time * 3.3ppm, achieve the accurate nitrogen content controlling finished product; The omnidistance nitrogen that only uses of carbon rejection process carries out nitrogen pick-up as lift gas, does not affect the effect of de-carbon; Decrease the use of nitrogen alloy, reduce production cost.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
The schematic flow sheet of the method for a kind of Ultra-low carbon Glassed Steel molten steel nitrogen pick-up that Fig. 1 provides for embodiment of the present invention one.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain, all belongs to the scope of protection of the invention.
Embodiment one
As shown in Figure 1, the schematic flow sheet of the method for a kind of Ultra-low carbon Glassed Steel molten steel nitrogen pick-up that provides for embodiment of the present invention one of Fig. 1.
The method of a kind of Ultra-low carbon Glassed Steel molten steel provided by the invention nitrogen pick-up, comprises
Step S10: molten iron converter smelted to decarbonizing furnace, at carbon period, utilizes nitrogen carry out decarburization as lift gas and control lift gas flow at 150-170Nm
3between/h, meanwhile control vacuum system and bleed, make the vacuum tightness of described decarbonizing furnace be not more than 100Pa.In the present embodiment, after molten iron converter to decarbonizing furnace, first thermometric carried out to decarbonizing furnace and determine the operation of oxygen, determining carry out nature decarbonization process flow process or force oxygen decarburization process flow process according to the temperature value recorded and oxygen level value.Then using nitrogen as lift gas to reduce the carbon in molten steel, wherein lift gas flow control is at 150-170Nm
3between/h, lift gas being set to nitrogen can also increase nitrogen content in molten steel simultaneously.The vacuum pump meanwhile controlling vacuum system vacuumizes process to decarbonizing furnace, and makes its vacuum tightness be not more than 100Pa.
Step S20: after the vacuum tightness of described decarbonizing furnace is not more than 100Pa, lift gas flow is to 210-230Nm gradually
3/ h also maintains, and reaches 210-230Nm at described lift gas flow
3the vacuum tightness controlling described decarbonizing furnace during/h is not more than 1kPa.In the present embodiment, utilize nitrogen to carry out carbonization treatment 5-8min as lift gas, namely open 2 grades of pump 5-8min, now the vacuum tightness of decarbonizing furnace is not more than 1kPa.During this period, progressively by the flow enhancement of lift gas to 210-230Nm
3numerical value between/h, and maintain the end of this numerical value to decarbonization process.
In the present embodiment, proceed Decarburization Operation and keep corresponding 210-230Nm
3the lift gas flow of/h, until when in molten steel in decarbonizing furnace, carbon content is not more than 20ppm, carbon period terminates [O]: 800ppm in corresponding molten steel, and [C]: 0.025-0.04%, the temperature of decarbonizing furnace is at 1670-1690 DEG C.
Step S30: when carbon content is not more than 20ppm in the molten steel in described decarbonizing furnace, controls described carbon period and terminates.In the present embodiment, operator can rule of thumb every for some time to the molten steel in decarbonizing furnace in carbon content detect, until when carbon content is not more than 20ppm in molten steel in decarbonizing furnace, terminates the operation of the molten steel in decarbonizing furnace being carried out to decarburization, and go to subsequent processing.
Preferably, utilize nitrogen to carry out carbonization treatment 5-8min as lift gas, after namely opening 2 grades of pump 5-8min, then carry out decarbonization process 10min, when can make that in the molten steel in decarbonizing furnace, carbon content is not more than 20ppm, terminate the operation of the molten steel in decarbonizing furnace being carried out to decarburization.
Step S40: add aluminum shot and carry out deoxidation operation, then adds alloy according to described Ultra-low carbon Glassed Steel composition and controls lift gas flow at 160-180Nm
3/ h or 200-220Nm
3in the interval that/h is corresponding, until the molten steel in described decarbonizing furnace meets vacuum breaker after described Ultra-low carbon Glassed Steel composition.In the present embodiment, the time that whole decarbonization process continues roughly between 15-18min, and carries out deoxidation step after decarbonization process terminates.Namely in molten steel, aluminum shot is added, and circulation running 2min.After 2min according to the mass percent of required chemical composition be: [C] <0.003, [Mn]: 0.11-0.15, [P]: <0.012, [S]: 0.020-0.030, [Ti]: 0.08-0.12, [Al]: 0.020-0.045, [N]: 0.0060-0.0120, all the other are the molten steel of Fe and inevitable impurity, add the alloy such as ferromanganese or ferrotianium in molten steel.Vacuum tightness is maintained 4-7kPa by the 4 grades of pumps controlled after deoxidation of molten steel in vacuum pump, simultaneously by the flow control of lift gas at 160-180Nm
3/ h or 200-220Nm
3in the interval that/h is corresponding.And calculate the nitrogen increased amount after by decarbonization process and deoxidation step according to the following formula:
Carbon period molten steel nitrogen increased amount=denitrogenation time * 0.93ppm;
Control lift gas flow at described 160-180Nm
3when/h is interval, after deoxidation to vacuum breaker nitrogen increased amount=deoxidation to vacuum breaker time * 2.5ppm;
Control lift gas flow at described 200-220Nm
3when/h is interval, after deoxidation to vacuum breaker nitrogen increased amount=deoxidation to vacuum breaker time * 3.3ppm.
The method of a kind of Ultra-low carbon Glassed Steel molten steel provided by the invention nitrogen pick-up, control carbon content and decarburization time in the molten steel in the lift gas flow of nitrogen in decarburization and deoxidization technique, the vacuum tightness size of decarbonizing furnace, decarbonizing furnace to make to carry out nitrogen pick-up while de-carbon, and finished product nitrogen content can be controlled accurately, to be specially lift gas flow in 5-8min by 150-170Nm
3numerical value between/h, vacuum tightness is down to below 100Pa, is promoted to 210-230Nm3/h gradually subsequently, vacuum tightness maintains below 1kPa,, and when being maintained until that in the molten steel in decarbonizing furnace, carbon content is not more than 20ppm, carry out nitrogen pick-up while making not affect decarburization to special value; In addition, by controlling vacuum tightness size, utilize the lift gas flow and appropriate alloy that change by molten steel nitrogen pick-up to target value; And by setting decarburization and deoxidization technique in the lift gas flow of nitrogen, the vacuum tightness size of decarbonizing furnace and decarburization time, make carbon period molten steel nitrogen increased amount=denitrogenation time * 0.93ppm; Control lift gas flow at described 160-180Nm
3when/h is interval, after deoxidation to vacuum breaker nitrogen increased amount=deoxidation to vacuum breaker time * 2.5ppm; Control lift gas flow at described 200-220Nm
3when/h is interval, after deoxidation to vacuum breaker nitrogen increased amount=deoxidation to vacuum breaker time * 3.3ppm, achieve the accurate nitrogen content controlling finished product; The omnidistance nitrogen that only uses of carbon rejection process carries out nitrogen pick-up as lift gas, does not affect the effect of de-carbon; Decrease the use of nitrogen alloy, reduce production cost.
Embodiment two
Below by the smelting example of 6 Ultra-low carbon Glassed Steel smelting molten steels, technical scheme of the present invention is described further.
Between carbon period to the control of vacuum system be: utilize 2 of vacuum pump grades of pumps to bleed, make the vacuum tightness of decarbonizing furnace at below 100Pa, and carry out between decarburization 5-8min, now the vacuum tightness of decarbonizing furnace is not more than 1kPa.Simultaneously to decarbonizing furnace input lift gas nitrogen, and lift gas flow is 150-170Nm
3/ h.Between the 5-8min carrying out decarburization, lift gas flow is carried gradually to 210-230Nm
3between/h.Whole decarburization time is roughly 15-18min, maintains this lift gas flow 210-230Nm
3the level of/h terminates to decarburization, and in the molten steel now in decarbonizing furnace, carbon content is not more than 20ppm.
After decarbonization process terminates, carry out deoxidation step by adding aluminum shot.And after interpolation aluminum shot circulates two minutes with the mass percent of chemical composition be: [C] <0.003, [Mn]: 0.11-0.15, [P]: <0.012, [S]: 0.020-0.030, [Ti]: 0.08-0.12, [Al]: 0.020-0.045, [N]: 0.0060-0.0120, all the other molten steel for Fe and inevitable impurity are standard, supply ferromanganese or ferrotianium according to this standard.After deoxidation step starts, control vacuum system and close 1-3 level vacuum pump, use 4 grades and 5 grades of vacuum pumps, make vacuum degree control at 4-7kPa.Table 1 and table 2 are decarburization and the deoxidation process parameter of 6 Ultra-low carbon Glassed Steel smelting molten steels.
Table 1 is the carbon rejection process of 6 Ultra-low carbon Glassed Steel smelting molten steels
Table 2 is the deoxidation process of 6 Ultra-low carbon Glassed Steel smelting molten steels
In the present invention, under the prerequisite not changing existing maturation process, by controlling carbon content and decarburization time in the molten steel in the lift gas flow of nitrogen, the vacuum tightness size of decarbonizing furnace, decarbonizing furnace, make carbon period molten steel nitrogen increased amount=denitrogenation time * 0.93ppm; After deoxidation to vacuum breaker nitrogen increased amount=deoxidation to vacuum breaker time * 2.5ppm, control lift gas flow at 160-180Nm
3when/h is interval; After deoxidation to vacuum breaker nitrogen increased amount=deoxidation to vacuum breaker time * 3.3ppm, control lift gas flow at 200-220Nm
3when/h is interval, and then low cost the stable and accurately nitrogen content manufactured a finished product being controlled in the scope of 60-120ppm, and does not affect carbon content in decarburization to the molten steel in decarbonizing furnace at this moment and be not more than 20ppm.
It should be noted last that, above embodiment is only in order to illustrate technical scheme of the present invention and unrestricted, although with reference to example to invention has been detailed description, those of ordinary skill in the art is to be understood that, can modify to technical scheme of the present invention or equivalent replacement, and not departing from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of right of the present invention.
Claims (9)
1. a method for Ultra-low carbon Glassed Steel molten steel nitrogen pick-up, is characterized in that,
Molten iron converter is smelted to decarbonizing furnace, at carbon period, utilizes nitrogen carry out decarburization as lift gas and control lift gas flow at 150-170Nm
3between/h, meanwhile control vacuum system and bleed, make the vacuum tightness of described decarbonizing furnace be not more than 100Pa;
After the vacuum tightness of described decarbonizing furnace is not more than 100Pa, lift gas flow is to 210-230Nm gradually
3/ h also maintains, and reaches 210-230Nm at described lift gas flow
3the vacuum tightness controlling described decarbonizing furnace during/h is not more than 1kPa;
When carbon content is not more than 20ppm in the molten steel in described decarbonizing furnace, controls described carbon period and terminate;
Add aluminum shot and carry out deoxidation operation, then add alloy according to described Ultra-low carbon Glassed Steel composition and control lift gas flow at 160-180Nm
3/ h or 200-220Nm
3in the interval that/h is corresponding, until the molten steel in described decarbonizing furnace meets vacuum breaker after described Ultra-low carbon Glassed Steel composition.
2. the method for Ultra-low carbon Glassed Steel molten steel nitrogen pick-up as claimed in claim 1, it is characterized in that, the described nitrogen that utilizes carries out decarburization as lift gas and controls lift gas flow at 150-170Nm
3also comprise between/h and carry out thermometric and determine oxygen operating to described molten iron, and according to the data selection nature decarburization pattern recorded or pressure deoxidation pattern.
3. the method for Ultra-low carbon Glassed Steel molten steel nitrogen pick-up as claimed in claim 1, it is characterized in that, the time that described carbon period is corresponding equals decarburization time, after described decarburization time, carbon period molten steel nitrogen increased amount, deoxidation to vacuum breaker time, deoxidation to the relation between vacuum breaker nitrogen increased amount and the total nitrogen increased amount of molten steel by following formulate:
Carbon period molten steel nitrogen increased amount=denitrogenation time * 0.93ppm;
Described control lift gas flow is at described 160-180Nm
3when/h is interval, after deoxidation to vacuum breaker nitrogen increased amount=deoxidation to vacuum breaker time * 2.5ppm;
Described control lift gas flow is at described 200-220Nm
3when/h is interval, after deoxidation to vacuum breaker nitrogen increased amount=deoxidation to vacuum breaker time * 3.3ppm;
To vacuum breaker nitrogen increased amount after the total nitrogen increased amount of molten steel=carbon period molten steel nitrogen increased amount+deoxidation.
4. the method for the Ultra-low carbon Glassed Steel molten steel nitrogen pick-up as described in any one of claims 1 to 3, is characterized in that, it is between 5-8min that the vacuum tightness of the described decarbonizing furnace of described control is not more than time corresponding to 1kPa.
5. the method for Ultra-low carbon Glassed Steel molten steel nitrogen pick-up as claimed in claim 4, it is characterized in that, when in the molten steel in described decarbonizing furnace, carbon content is not more than 20ppm, [O]: 800ppm in molten steel at the end of controlling described carbon period in described decarbonizing furnace, [C]: 0.025-0.04%, the temperature of described decarbonizing furnace is at 1670-1690 DEG C.
6. the method for Ultra-low carbon Glassed Steel molten steel nitrogen pick-up as claimed in claim 5, is characterized in that, carbon content in the molten steel in described decarbonizing furnace be down to and be not more than time corresponding to 20ppm between 15-18min.
7. the method for Ultra-low carbon Glassed Steel molten steel nitrogen pick-up as claimed in claim 4, it is characterized in that, interpolation aluminum shot carries out controlling vacuum pump after deoxidation operation comprises deoxidation and makes vacuum tightness between 4-7kPa, adds aluminum shot and carries out deoxidation, and adds ferromanganese and/or ferrotianium after interpolation aluminum shot 2min.
8. the method for Ultra-low carbon Glassed Steel molten steel nitrogen pick-up as claimed in claim 7, it is characterized in that, meeting each Ingredient percent in the molten steel in the described decarbonizing furnace of described Ultra-low carbon Glassed Steel composition is: [C] <0.003, [Mn]: 0.11-0.15, [P]: <0.012, [S]: 0.020-0.030, [Ti]: 0.08-0.12, [Al]: 0.020-0.045, [N]: 0.0060-0.0120, all the other are Fe and inevitable impurity.
9. the method for Ultra-low carbon Glassed Steel molten steel nitrogen pick-up as claimed in claim 8, it is characterized in that, described alloy is ferromanganese and/or ferrotianium.
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| CN104550898B (en) * | 2014-12-27 | 2016-06-01 | 首钢总公司 | A kind of for the increasing method for nitrogen of v n micro alloying steel grade in casting process |
| CN107287388A (en) * | 2016-04-04 | 2017-10-24 | 鞍钢股份有限公司 | RH blowing nitrogen increasing method for low-aluminum high-nitrogen ultra-low carbon steel |
| CN110317919B (en) * | 2018-03-30 | 2021-05-07 | 上海梅山钢铁股份有限公司 | Low-cost production method of low-carbon enamel steel |
| CN110093563B (en) * | 2019-04-30 | 2020-06-09 | 马鞍山钢铁股份有限公司 | Enamel cold-rolled steel plate for deep drawing and production method thereof |
| CN113025786B (en) * | 2021-02-07 | 2022-12-13 | 首钢集团有限公司 | RH refining method and application of ultra-low carbon steel |
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