CN111519098B - Low-carbon steel and deoxidation method for controlling inclusions in low-carbon steel - Google Patents
Low-carbon steel and deoxidation method for controlling inclusions in low-carbon steel Download PDFInfo
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- CN111519098B CN111519098B CN202010399167.5A CN202010399167A CN111519098B CN 111519098 B CN111519098 B CN 111519098B CN 202010399167 A CN202010399167 A CN 202010399167A CN 111519098 B CN111519098 B CN 111519098B
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/10—Handling in a vacuum
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
Abstract
The application discloses a low-carbon steel and a deoxidation method for controlling inclusions in the low-carbon steel, wherein the low-carbon steel comprises the following chemical components in percentage by mass: c is less than or equal to 0.2%, Si: 0.20 to 0.35%, Mn: 1.2-1.8%, S is less than or equal to 0.0020%, Ca: 0.0010-0.0015%, O: 0.0012-0.0020%, Ti: 0.01-0.03%, Al: 0.02-0.03%, N: 0.0025-0.0040% and the balance of Fe and inevitable impurity elements; the mass fraction ratio of the Ca to the O is 0.5-1.2, and the mass fraction ratio of the Ti to the Al is 0.5-1.0. By adopting the method, the inclusions are controlled to be Al-Ti-Ca-O inclusions with dispersed small-size distribution, the grades of all the inclusions are less than or equal to 0.5 grade, and the proportion of the inclusions with the size of less than or equal to 5 mu m is more than 99 percent.
Description
Technical Field
The invention belongs to the technical field of steel-making production, and particularly relates to low-carbon steel and a deoxidation method for controlling inclusions in the low-carbon steel.
Background
The low-carbon steel has good plasticity and toughness, so that it has good cold formability, and can be rolled and foldedCold forming by bending, stamping and other methods; meanwhile, the welding material also has good weldability. In the production of low-carbon steel, after the smelting of a converter is finished, a large amount of oxygen is contained in molten steel, so that a deoxidizer is required to be added to remove the oxygen. In the process of deoxidation, non-metallic oxides are formed, which remain in the steel rather than having to discharge the molten steel, and are called inclusions, and these inclusions, particularly large-sized inclusions and hard inclusions, destroy the continuity of the metal matrix in the steel, so that the plasticity and toughness of the material are reduced, the fatigue property is lowered, and the cold-hot workability of the steel is deteriorated. With the progress of the steelmaking process and the application of clean steel smelting technology, large-size inclusions are controlled to a certain degree, but in some high-end varieties, such as HIC-resistant pipeline steel, low-yield-ratio bridge steel, crack-resistant ship plate steel and the like, the side length exceeding 343 is not allowed to exist in the steel
The large-sized inclusions (corresponding to 2.0 grade) affect the stability of steel sheet control.
Disclosure of Invention
The invention provides low-carbon steel and a deoxidation method for controlling inclusions in the low-carbon steel, and aims to solve the problem of poor steel plate stability caused by large-size inclusions in the existing steelmaking production.
The embodiment of the invention provides low-carbon steel which comprises the following chemical components in percentage by mass: c is less than or equal to 0.2%, Si: 0.20 to 0.35%, Mn: 1.2-1.8%, S is less than or equal to 0.0020%, Ca: 0.0010-0.0015%, O: 0.0012-0.0020%, Ti: 0.01-0.03%, Al: 0.02-0.03%, N: 0.0025-0.0040% and the balance of Fe and inevitable impurity elements;
the mass fraction ratio of the Ca to the O is 0.5-1.2, and the mass fraction ratio of the Ti to the Al is 0.5-1.0.
The embodiment of the invention also provides a deoxidation method for controlling the inclusions in the low-carbon steel, which comprises the following steps,
obtaining smelting molten steel of the converter;
tapping the converter smelting molten steel, and adding a silicon-manganese alloy into the tapping to perform weak deoxidation;
carrying out LF refining on the tapping molten steel, wherein in the LF refining, an aluminum deoxidizer is added for strong deoxidation, and after 2-3 min, a titanium alloy is added for weak deoxidation to obtain refined molten steel;
after the refined molten steel is subjected to vacuum treatment, feeding a calcium wire for strong deoxidation and continuous casting to obtain low-carbon steel; the low-carbon steel comprises the following chemical components in percentage by mass: c is less than or equal to 0.2%, Si: 0.20 to 0.35%, Mn: 1.2-1.8%, S is less than or equal to 0.0020%, Ca: 0.0010-0.0015%, O: 0.0012-0.0020%, Ti: 0.01-0.03%, Al: 0.02-0.03%, N: 0.0025-0.0040% and the balance of Fe and inevitable impurity elements; the mass fraction ratio of the Ca to the O is 0.5-1.2, and the mass fraction ratio of the Ti to the Al is 0.5-1.0.
Further, in the smelting molten steel of the converter, the mass fraction of sulfur is less than or equal to 0.0020 percent.
Further, the mass fraction of oxygen in the molten steel is 0.0030-0.0040%
Further, in the refining, slagging is controlled, so that the sum of the mass fractions of FeO and MnO in the slag after slagging is less than or equal to 1.5%, and the alkalinity is 5.0-10.0.
Further, in the RH vacuum treatment, the vacuum treatment time is 12-18 min, wherein the pressure is 60-100 KPa.
Further, in the continuous casting, the superheat degree is 15-30 ℃.
Further, in the continuous casting, dynamic soft reduction treatment is adopted, and the reduction amount under the dynamic soft reduction is 5.5-8 mm.
One or more technical solutions in the embodiments of the present invention have at least the following technical effects or advantages:
the embodiment of the invention provides low-carbon steel and a deoxidation method for controlling inclusions in the low-carbon steel, wherein the low-carbon steel comprises the following chemical components in percentage by mass: c is less than or equal to 0.2%, Si: 0.20 to 0.35%, Mn: 1.2-1.8%, S is less than or equal to 0.0020%, Ca: 0.0010-0.0015%, O: 0.0012-0.0020%, Ti: 0.01-0.03%, Al: 0.02-0.03%, N: 0.0025-0.0040% and the balance of Fe and inevitable impurity elements; the mass fraction ratio of the Ca to the O is 0.5-1.2, and the mass fraction ratio of the Ti to the Al is 0.5-1.0. In the application, Ti element is added, the mass fraction ratio of Ti to Al and the mass fraction ratio of Ca to O are controlled, aluminum oxide inclusions after Al deoxidation are changed into small-size Al-Ti-O inclusions which are distributed in a dispersion manner, the Ca element and the Al-Ti-O inclusions are combined to form spherical smaller Al-Ti-Ca-O inclusions, and the inclusions are rated to be not more than 0.5 grade.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
FIG. 1 is a microscopic view of inclusions in a low carbon steel according to an example of the present application.
Detailed Description
The present invention will be described in detail below with reference to specific embodiments and examples, and the advantages and various effects of the present invention will be more clearly apparent therefrom. It will be understood by those skilled in the art that these specific embodiments and examples are for the purpose of illustrating the invention and are not to be construed as limiting the invention.
Throughout the specification, unless otherwise specifically noted, terms used herein should be understood as having meanings as commonly used in the art. Accordingly, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. If there is a conflict, the present specification will control.
Unless otherwise specifically stated, various raw materials, reagents, instruments, equipment and the like used in the present invention are commercially available or can be prepared by existing methods.
The inclusions are generated and grown during the steel making process, and thus the control of the inclusions is performed at an initial stage. The inclusions are generated after deoxidation, the nucleation speed and the growth rate of the inclusions generated by different deoxidizers are not much the same, and because multiple deoxidizers exist in the steelmaking process and can react with each other correspondingly, the selection and the adding time of the deoxidizers and the control of molten steel components can control the inclusions to be the inclusions with small-size distribution and dispersion, which becomes a key and difficult point.
In order to solve the technical problems, the embodiment of the invention provides the following general ideas:
in one aspect, an embodiment of the present invention provides a low-carbon steel, where the low-carbon steel is composed of the following chemical components by mass: c is less than or equal to 0.2%, Si: 0.20 to 0.35%, Mn: 1.2-1.8%, S is less than or equal to 0.0020%, Ca: 0.0010-0.0015%, O: 0.0012-0.0020%, Ti: 0.01-0.03%, Al: 0.02-0.03%, N: 0.0025-0.0040% and the balance of Fe and inevitable impurity elements;
the mass fraction ratio of the Ca to the O is 0.5-1.2, and the mass fraction ratio of the Ti to the Al is 0.5-1.0.
In the application, Ti element is added, the mass fraction ratio of Ti to Al and the mass fraction ratio of Ca to O are controlled, aluminum oxide inclusions after Al deoxidation are changed into small-size Al-Ti-O inclusions which are distributed in a dispersion manner, the Ca element and the Al-Ti-O inclusions are combined to form spherical smaller Al-Ti-Ca-O inclusions, and the inclusions are rated to be not more than 0.5 grade.
In another aspect, embodiments of the present invention provide a method for controlling deoxidation of inclusions in low carbon steel as described above, the method comprising,
and S1, obtaining the smelting molten steel of the converter.
Further, in the smelting molten steel of the converter, the mass fraction of sulfur is less than or equal to 0.0020 percent.
And S2, tapping the molten steel smelted by the converter, and adding a silicon-manganese alloy into the tapping to perform weak deoxidation.
Further, the mass fraction of oxygen in the molten steel is 0.0030-0.0040%.
The Si-Mn alloy is adopted to carry out weak deoxidation on the tapping molten steel, and SiO is adopted2And MnO as a deoxidation product, which can provide an inclusion nucleation site. The silicon-manganese alloy can be selected from ferrosilicon and ferromanganese, and can also be selected from anyOther alloys containing silicon and manganese which do not pollute the molten steel.
And S3, carrying out LF refining on the molten steel, adding an aluminum deoxidizer for strong deoxidation in the LF refining, and adding a titanium alloy for weak deoxidation after 2-3 min to obtain the refined molten steel.
Aluminum deoxidizers include, but are not limited to, aluminum products such as aluminum iron, aluminum pellets, and the like. Adding a silicon-manganese alloy for weak deoxidation for 8-10 min, and adding an aluminum deoxidizer for strong deoxidation, so that SiO in molten steel can be quickly reduced2And MnO to obtain Al2O3. In addition, because of SiO2And MnO grows slowly, and aluminum can be added for strong deoxidation after silicon-manganese deoxidation is carried out for 8-10 min. If the aluminum deoxidizer is added too early, the inclusions are unstable after deoxidation, and the possibility of large inclusions exists after the Al addition reaction; if the aluminum deoxidizer is added too late, SiO is generated2And too large inclusions of MnO.
If aluminum deoxidation is firstly adopted and then silicon-manganese deoxidation is carried out, the sizes of impurities are overlarge due to the high growth speed of alumina, so that the silicon-manganese deoxidant is firstly adopted for deoxidation, and then aluminum is utilized for reducing SiO2And MnO to control the size of the inclusions.
Adding ferrotitanium for 2-3 min after aluminum deoxidation, wherein on one hand, the size of alumina inclusions is not too large in a short time; on the other hand, ferrotitanium is combined with small-sized alumina to form smaller-sized, dispersedly distributed Al-Ti-O system inclusions. At this point, the large-size alumina in the steel has floated to the slag for removal, and the oxygen content is very low.
Further, in the refining, slagging is controlled, so that the sum of the mass fractions of FeO and MnO in the slag after slagging is less than or equal to 1.5%, and the alkalinity is 5.0-10.0.
The alkalinity is CaO and SiO in the slag2Mass fraction ratio of (2). Controlling the high alkalinity of the slag and the oxidability of the final slag, namely ensuring that S in molten steel is less than or equal to 0.0020 percent so as to ensure that calcium in the calcium treatment reacts with small-sized Al-Ti-O system inclusions; secondly, large-size inclusions inevitably generated in the molten steel enter the slag after floating.
S4, after the refined molten steel is subjected to vacuum treatment, feeding a calcium wire for strong deoxidation and continuous casting to obtain low-carbon steel;
the low-carbon steel comprises the following chemical components in percentage by mass: c is less than or equal to 0.2%, Si: 0.20 to 0.35%, Mn: 1.2-1.8%, S is less than or equal to 0.0020%, Ca: 0.0010-0.0015%, O: 0.0012-0.0020%, Ti: 0.01-0.03%, Al: 0.02-0.03%, N: 0.0025-0.0040% and the balance of Fe and inevitable impurity elements;
the mass fraction ratio of the Ca to the O is 0.5-1.2, and the mass fraction ratio of the Ti to the Al is 0.5-1.0.
The molten steel is subjected to silicomanganese deoxidation, aluminum deoxidation and titanium deoxidation in sequence, LF and RH refining are matched, and a small amount of large-size inclusion Al is contained in the molten steel2O3And calcium aluminate float to the slag to remove, and small-sized Al-Ti-O series inclusion, fine calcium aluminate magnesite inclusion and a small amount of Al are left2O3. The Al-Ti-O inclusions with small sizes are combined with calcium and then spheroidized, so that the inclusions become smaller; small amount of Al in molten steel2O3The inclusions form spherical low-melting-point small-size inclusions with Ca. At the same time, Ca can be combined with S in molten steel to form a product with the size not exceeding 5
The CaS is mixed, which is beneficial to desulfurization.
The ratio of Ca/O and the ratio of Ti/Al are both too small or too large, so that the particle size of the Al-Ti-Ca-O inclusion is larger, the Ca treatment effect is not ideal, a sufficient number of small-size inclusion particles in the steel are ensured, and the small-size inclusion particles are also completely denatured and spheroidized, so that the Al-Ti-Ca-O inclusion is ensured.
It should be noted that calcium wire is fed for strong deoxidation 25-35 min after the titanium alloy is weakly deoxidized.
Further, in the RH vacuum treatment, the vacuum treatment time is 12-18 min, wherein the pressure is 60-100 KPa.
N in the steel after RH vacuum treatment is 0.0025-0.0040%, and small-sized TiN can be separated out by combining with titanium element, which is beneficial to pinning the grain boundary action, and the pinning grain boundary action is beneficial to growing the structure grains in the welding process.
Further, in the continuous casting, the superheat degree is 15-30 ℃.
Further, in the continuous casting, dynamic soft reduction treatment is adopted, and the reduction amount under the dynamic soft reduction is 5.5-8 mm.
The superheat degree is ensured, and the quality of the casting blank is ensured by adopting a soft reduction process.
The invention adopts the sequential mode of 'silicon-manganese weak deoxidation → aluminum strong deoxidation → titanium weak deoxidation → calcium strong deoxidation' to perform deoxidation, firstly, the silicon-manganese deoxidation is utilized to control the oxygen content in the steel and ensure the nucleation capability of a certain amount of inclusions, at the moment, the inclusions in the steel are mainly Si-Mn-O series inclusions, and the growth speed of the silicon-manganese series inclusions is slower; the Si-Mn inclusion is rapidly reduced into the alumina inclusion by strong deoxidation of aluminum, and because the growth speed of the alumina inclusion is high, ferrotitanium must be added after the deoxidation of aluminum is carried out for 2-3 min, and the reaction is carried out on the alumina inclusion at the moment to generate Al-Ti-O inclusion. At the moment, the total oxygen content in the steel is low, large-size alumina inclusions are removed in an upward floating mode, and Al-Ti-O inclusions which are small in size, difficult to gather and dispersed in distribution are mainly distributed. Then Ca strong deoxidation is adopted to further denature and spheroidize the inclusions, so that Al-Ti-O series inclusions are changed into finer Al-Ti-Ca-O inclusions, and preparation is made for the subsequent induction of the grain refining effect of the acicular ferrite in the crystal.
According to the invention, by controlling the contents and content ratios of calcium and oxygen, titanium and aluminum, and the addition sequence and addition time of the deoxidized alloy in the steel, the inclusions are controlled to be Al-Ti-Ca-O inclusions with dispersed small-size distribution, the grades of all the inclusions after the low-carbon steel is rolled are less than or equal to 0.5 grade, wherein the proportion of the inclusions with the size of less than or equal to 5 mu m is more than 99%, so that the condition that the longest edge exceeds 343 mu m is eliminated
And provides for improving low temperature toughness and weldability by utilizing the grain refining effect of the inclusions.
The present invention will be described in detail with reference to examples, comparative examples and experimental data, and a low carbon steel and a method for controlling deoxidation of inclusions in a low carbon steel will be described.
Examples 1 to 5, comparative examples 1 to 2
The method for producing the low-carbon steel by smelting the plate steel of the steel grade E40 and sequentially adopting the processes of molten iron pretreatment, converter, LF refining, RH refining and continuous casting comprises the following specific steps and parameters:
Step 2, tapping after the smelting of the converter is finished, and adding a silicon-manganese alloy for deoxidation in the tapping process;
and 3, feeding the molten steel into an LF refining station, adding an AlFe alloy for deoxidation 9min after the silicon-manganese alloy is deoxidized, and adding 70TiFe alloy for deoxidation 2min after the AlFe alloy is deoxidized. Meanwhile, slagging is carried out in an LF refining station, and the oxidability and alkalinity of slag are controlled, so that desulfurization is facilitated.
And 4, after LF refining is finished, RH vacuum refining is carried out on the molten steel, and the deep vacuum treatment time is controlled.
And 5, after the RH vacuum refining is finished, adding a hard iron sheet pure calcium wire for deoxidation 30min before the weak deoxidation of the titanium alloy.
And 6, casting the molten steel after the pure calcium wire deoxidation of the hard iron sheet, controlling the superheat degree of the molten steel in the tundish, and simultaneously obtaining a low-carbon steel plate blank under dynamic soft reduction.
Comparative example 3
Smelting steel type E40 ship plate steel, and adopting molten iron pretreatment, converter, LF refining, RH refining and continuous casting process to produce high-quality medium plate steel, the concrete steps and parameters are as follows:
Step 2, tapping after the smelting of the converter is finished, and adding a silicon-manganese alloy for deoxidation in the tapping process;
and 3, feeding the molten steel into an LF refining station for slagging, and controlling the oxidability and alkalinity of slag to facilitate desulfurization.
And 4, after LF refining is finished, RH vacuum refining is carried out on the molten steel, and the deep vacuum treatment time is controlled.
And 5, adding a hard iron sheet pure calcium wire for deoxidation after the RH vacuum refining is finished.
And 6, continuous casting: and (3) obtaining the low-carbon steel plate blank by adopting dynamic soft reduction and controlling the superheat degree of the molten steel.
The chemical compositions of the mild steel slabs of examples 1 to 5 and comparative examples 1 to 3 are shown in table 1 (the balance being Fe and inevitable impurity elements), and the process control in steps 1 to 6 is shown in table 2.
After rolling the mild steel slabs of examples 1 to 5 and comparative examples 1 to 3, samples were taken, and after polishing and cleaning, the appearance, size and composition of inclusions were observed by using a light mirror and a scanning electron microscope, and were subjected to comparative rating with the ASTM-E45-2010 standard, and the results are shown in table 3.
TABLE 1
TABLE 2
TABLE 3
Finally, it should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (4)
1. The low-carbon steel is characterized by comprising the following chemical components in percentage by mass:
，
，
，
the balance of Fe and inevitable impurity elements;
the mass fraction ratio of the Ca to the O is 0.5-1.2, and the mass fraction ratio of the Ti to the Al is 0.5-1.0; controlling the mass fraction ratio of Ti to Al and the mass fraction ratio of Ca to O, converting Al deoxidized alumina inclusions into small-size Al-Ti-O inclusions which are dispersedly distributed, combining Ca elements with the Al-Ti-O inclusions to form spherical smaller Al-Ti-Ca-O inclusions, and grading to obtain the inclusions with the size of less than or equal to 5 grade and less than or equal to 0.5 grade
The proportion of the inclusions is more than 99 percent;
the deoxidation method for controlling the inclusions in the low-carbon steel comprises the following steps,
obtaining smelting molten steel of the converter;
tapping the converter smelting molten steel, and adding a silicon-manganese alloy into the tapping to perform weak deoxidation;
carrying out LF refining on the tapping molten steel, wherein in the LF refining, an aluminum deoxidizer is added for strong deoxidation, and after 2-3 min, a titanium alloy is added for weak deoxidation to obtain refined molten steel;
after RH vacuum treatment is carried out on the refined molten steel, calcium wires are fed for strong deoxidation and continuous casting, and the low-carbon steel is obtained;
in the smelting molten steel of the converter, the mass fraction of sulfur is less than or equal to 0.0020 percent;
the mass fraction of oxygen in the tapping molten steel is 0.0030-0.0040%;
in the LF refining, slagging is controlled, so that the sum of the mass fractions of FeO and MnO in the slag after slagging is less than or equal to 1.5%, and the alkalinity is 5.0-10.0.
2. The low carbon steel according to claim 1, wherein in the RH vacuum treatment, a vacuum treatment time at a pressure of 60KPa to 100 KPa is 12 to 18 min.
3. The low carbon steel according to claim 1, wherein a degree of superheat is 15 to 30 ℃ in the continuous casting.
4. The low carbon steel according to claim 1, wherein the continuous casting is performed under a dynamic light reduction of 5.5 to 8 mm.
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| CN102191429A (en) * | 2010-03-11 | 2011-09-21 | 宝山钢铁股份有限公司 | Method for improving high heat input welding performance of thick steel plates |
| CN102373371A (en) * | 2010-08-25 | 2012-03-14 | 宝山钢铁股份有限公司 | Method for raising large heat input weldability of thick steel plate |
| CN102766748A (en) * | 2012-08-10 | 2012-11-07 | 江苏省沙钢钢铁研究院有限公司 | Production method of low-temperature steel plate capable of being welded by high heat input |
| CN109321815A (en) * | 2017-07-31 | 2019-02-12 | 东北大学 | A kind of manufacturing method of resistance to Large Heat Input Welding high-strength steel plate |
| CN109023111A (en) * | 2018-09-26 | 2018-12-18 | 武汉钢铁有限公司 | A kind of 1000MPa grades of hot rolling automotive frame steel and its manufacturing method |
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