CN113528927A - Casting blank preparation method for controlling high-titanium steel inclusions - Google Patents
Casting blank preparation method for controlling high-titanium steel inclusions Download PDFInfo
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- 238000005266 casting Methods 0.000 title claims abstract description 28
- 229910001200 Ferrotitanium Inorganic materials 0.000 title claims abstract description 22
- 238000002360 preparation method Methods 0.000 title claims abstract description 10
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 106
- 239000010959 steel Substances 0.000 claims abstract description 106
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 66
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical group [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims abstract description 52
- 238000000034 method Methods 0.000 claims abstract description 35
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 33
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 33
- 229910052742 iron Inorganic materials 0.000 claims abstract description 33
- 238000007670 refining Methods 0.000 claims abstract description 33
- 229910052749 magnesium Inorganic materials 0.000 claims abstract description 20
- 239000011777 magnesium Substances 0.000 claims abstract description 20
- 238000003723 Smelting Methods 0.000 claims abstract description 14
- 238000010079 rubber tapping Methods 0.000 claims abstract description 13
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 9
- 229910052760 oxygen Inorganic materials 0.000 claims description 9
- 239000001301 oxygen Substances 0.000 claims description 9
- 238000005275 alloying Methods 0.000 claims description 8
- 238000006477 desulfuration reaction Methods 0.000 claims description 7
- 230000023556 desulfurization Effects 0.000 claims description 7
- 239000010936 titanium Substances 0.000 claims description 6
- 229910052719 titanium Inorganic materials 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 4
- 229910001209 Low-carbon steel Inorganic materials 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 2
- 229910052698 phosphorus Inorganic materials 0.000 claims description 2
- 239000000126 substance Substances 0.000 claims description 2
- 229910052717 sulfur Inorganic materials 0.000 claims description 2
- KCZFLPPCFOHPNI-UHFFFAOYSA-N alumane;iron Chemical compound [AlH3].[Fe] KCZFLPPCFOHPNI-UHFFFAOYSA-N 0.000 abstract description 8
- 238000005457 optimization Methods 0.000 abstract description 3
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 22
- 230000006911 nucleation Effects 0.000 description 12
- 238000010899 nucleation Methods 0.000 description 12
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 8
- 229910052593 corundum Inorganic materials 0.000 description 8
- 238000001556 precipitation Methods 0.000 description 8
- 238000007711 solidification Methods 0.000 description 8
- 230000008023 solidification Effects 0.000 description 8
- 229910001845 yogo sapphire Inorganic materials 0.000 description 8
- 238000006243 chemical reaction Methods 0.000 description 6
- 230000004048 modification Effects 0.000 description 6
- 238000012986 modification Methods 0.000 description 6
- 239000002244 precipitate Substances 0.000 description 6
- 229910001069 Ti alloy Inorganic materials 0.000 description 5
- 238000005253 cladding Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 229910000746 Structural steel Inorganic materials 0.000 description 3
- 238000005054 agglomeration Methods 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 238000009628 steelmaking Methods 0.000 description 3
- 238000004220 aggregation Methods 0.000 description 2
- 238000009749 continuous casting Methods 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 238000007872 degassing Methods 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 229910011208 Ti—N Inorganic materials 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- CYUOWZRAOZFACA-UHFFFAOYSA-N aluminum iron Chemical compound [Al].[Fe] CYUOWZRAOZFACA-UHFFFAOYSA-N 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
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Classifications
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
-
- 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
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
-
- 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
- C21C7/0006—Adding metallic additives
-
- 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
- C21C7/0056—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires
-
- 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
-
- 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
-
- 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
-
- 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
-
- 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
-
- 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 invention particularly relates to a casting blank preparation method for controlling high titanium steel inclusions, which belongs to the technical field of steel smelting and comprises the following steps: smelting molten iron in a converter, and then tapping to obtain molten steel; carrying out RH refining on the molten steel to obtain primary refined molten steel; feeding an iron-aluminum-coated magnesium core wire into the primary refined molten steel to obtain inclusion modified molten steel, wherein the magnesium content in the inclusion modified molten steel is controlled to be 8-15 ppm, and the aluminum content in the inclusion modified molten steel is controlled to be 200-400 ppm; performing LF refining on the inclusion modified molten steel to obtain secondary refined molten steel; continuously casting the secondary refined molten steel to obtain a casting blank; through the optimization of the whole process of high titanium steel smelting, large-size inclusions are removed through RH, and after the RH is finished, the inclusions are denatured by feeding special magnesium wires, so that the sizes of the inclusions are reduced.
Description
Technical Field
The invention belongs to the technical field of steel smelting, and particularly relates to a casting blank preparation method for controlling high-titanium steel inclusions.
Background
Titanium is widely used as a main alloy additive element in steel, the content of the titanium in the advanced high-strength steel for automobile structures developed in recent years exceeds 0.1%, second-phase particles of TiN and TiC are precipitated in the solidification process of the titanium, and the mechanical property of the steel is improved through precipitation strengthening and fine grain strengthening.
However, in high titanium content steel, since Ti-N concentration product is high, TiN and TiC precipitates already exist in molten steel before solidification, and further precipitate and grow in the solidification process, so that a large amount of TiN inclusions exceeding 10 μm exist in the finished product. High-strength automobile structural steel generally has requirements on hole expansion performance, and large size of TiN can cause fine micro cracks around a hole expansion, so that the hole expansion rate and other performances are reduced.
The existing technology controls the precipitation and growth of TiN inclusions by improving the cooling rate in the solidification process and other modes, but for high titanium steel, when the temperature of molten steel is reduced to be close to the solidification temperature, precipitates begin to exist in the molten steel. Meanwhile, the cooling rate increase of the surface of the slab has small influence on the cooling of the molten steel in the shell, and the influence on the precipitation process is small.
Disclosure of Invention
In view of the above problems, the present invention has been made to provide a method for producing a cast slab for controlling inclusions in a high titanium steel that overcomes or at least partially solves the above problems.
The embodiment of the invention provides a casting blank preparation method for controlling high titanium steel inclusions, which comprises the following steps:
smelting molten iron in a converter, and then tapping to obtain molten steel;
carrying out RH refining on the molten steel to obtain primary refined molten steel;
feeding an iron-aluminum-coated magnesium core wire into the primary refining molten steel to obtain inclusion modified molten steel, wherein the magnesium content in the inclusion modified molten steel is controlled to be 8-15 ppm, and the aluminum content in the inclusion modified molten steel is controlled to be 200-400 ppm;
performing LF refining on the inclusion modified molten steel to obtain secondary refined molten steel;
and continuously casting the secondary refining molten steel to obtain a casting blank.
Optionally, feeding an iron-aluminum-clad magnesium core wire into the primary refined molten steel to obtain inclusion modified molten steel, wherein the iron-aluminum-clad magnesium core wire comprises a magnesium core, an aluminum skin layer coated on the magnesium core and an iron sheet layer coated on the aluminum skin layer; the magnesium core comprises passivated granular magnesium, and the content of magnesium in the magnesium core is 200g/m-240 g/m.
Optionally, the particle diameter of the magnesium core is 0.2mm-0.7 mm.
Optionally, the thickness of the aluminum skin layer is 2mm-3 mm.
Optionally, the composition of the iron skin layer comprises low-carbon steel, and the thickness of the iron skin layer is 2mm-3 mm.
Optionally, the molten iron is smelted in a converter, then steel tapping is performed to obtain molten steel, aluminum deoxidation is performed in the steel tapping process, the aluminum content in the molten steel is controlled to be 50ppm to 80ppm, and the dissolved oxygen content in the molten steel is controlled to be 10ppm to 20 ppm.
Optionally, the molten steel is subjected to RH refining to obtain primary refined molten steel, the vacuum degree of the RH refining is less than or equal to 100Pa, and the deep vacuum cycle time of the RH refining is controlled within 10min-15 min.
Optionally, the inclusion modified molten steel is subjected to LF refining to obtain secondary refined molten steel, and the method specifically includes:
and carrying out slagging, temperature regulation, deep desulfurization and alloying on the inclusion modified molten steel to obtain secondary refined molten steel.
Optionally, the molten iron is smelted in a converter, and then steel is tapped to obtain molten iron, wherein the molten iron is obtained by KR desulfurization.
Optionally, the secondary refining molten steel is continuously cast to obtain a casting blank, and the casting blank comprises the following chemical components in parts by mass: c: 0.05% -0.08%, Si: 0.27% -0.75%, Mn: 1.5% -1.75%, P: less than or equal to 0.018%, S: less than or equal to 0.005, Al: 0.015% -0.045%, Ti: 0.11% -0.14%, N: less than or equal to 0.005 percent.
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 a casting blank preparation method for controlling high titanium steel inclusionsThe method comprises the following steps: smelting molten iron in a converter, and then tapping to obtain molten steel; carrying out RH refining on the molten steel to obtain primary refined molten steel; feeding an iron-aluminum-coated magnesium core wire into the primary refining molten steel to obtain inclusion modified molten steel, wherein the magnesium content in the inclusion modified molten steel is controlled to be 8-15 ppm, and the aluminum content in the inclusion modified molten steel is controlled to be 200-400 ppm; performing LF refining on the inclusion modified molten steel to obtain secondary refined molten steel; continuously casting the secondary refined molten steel to obtain a casting blank; through the optimization of the whole process of high titanium steel smelting, large-size inclusions are removed through RH, and after the RH is finished, the inclusions are denatured by feeding special magnesium wires, so that Al is obtained2O3Conversion to fine Al2O3MgO or MgO, alloying in LF furnace, and finally adjusting titanium alloy, wherein part of TiN is fine Al at the high temperature of more than 1510 DEG C2O3MgO or MgO is used for nucleation and precipitation, and the nucleation energy is reduced. The TiN continues to be in fine Al during the solidification process2O3MgO or MgO is used as nucleation and precipitation to make TiN inclusion fine and dispersed. At the same time, Al which is easy to gather is made2O3Conversion to Al which is less prone to agglomeration2O3MgO or MgO, reducing the size of inclusions.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
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 flow chart provided by an embodiment of the present invention.
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.
In order to solve the technical problems, the general idea of the embodiment of the application is as follows:
according to an exemplary embodiment of the present invention, there is provided a method for manufacturing a cast slab for controlling inclusions in high titanium steel, the method including:
s1, smelting molten iron in a converter, and then tapping to obtain molten steel;
as an optional implementation mode, the molten iron is smelted in a converter, then the molten iron is tapped to obtain the molten iron, the molten steel is subjected to primary aluminum deoxidation during tapping, the aluminum content in the molten steel is controlled to be about 50ppm-80ppm, the dissolved oxygen content balanced with the aluminum content is controlled to be 10ppm-20ppm, and most of the oxygen content in the molten steel is removed after tapping.
S2, carrying out RH refining on the molten steel to obtain primary refined molten steel;
as an optional implementation mode, the method mainly removes large-size impurities and degasses in the RH refining process, the vacuum degree is less than or equal to 100Pa, and the deep vacuum circulation time is controlled within 10-15 min.
S3, feeding an iron-aluminum-coated magnesium core wire into the primary refined molten steel to obtain inclusion modified molten steel, wherein the magnesium content in the inclusion modified molten steel is controlled to be 8-15 ppm, and the aluminum content in the inclusion modified molten steel is controlled to be 200-400 ppm;
in actual operation, feeding an iron-aluminum-clad magnesium core wire into the primary refined molten steel to obtain inclusion modified molten steel, wherein the iron-aluminum-clad magnesium core wire is mainly structurally a double-layer sheath cladding, and specifically comprises a magnesium core, an aluminum skin layer cladding the magnesium core and an iron sheet layer cladding the aluminum skin layer; the magnesium core comprises passivated magnesium particles, the content of magnesium in the magnesium core is 200g/m-240g/m, and the particle diameter of the magnesium core is 0.2mm-0.7 mm; the thickness of the aluminum skin layer is 2mm-3 mm; the composition of the iron sheet layer comprises low carbon steel, the thickness of the iron sheet layer is 2mm-3mm, and the details are shown in the following table:
the Al is modified by feeding special magnesium wire2O3Conversion to fine Al2O3MgO or MgO, Al susceptible to aggregation2O3Conversion to Al which is less prone to agglomeration2O3-MgO or MgO, reducing the size of inclusions; meanwhile, in the subsequent alloying of the molten steel, at the high temperature of more than 1510 ℃, part of TiN is in the form of fine Al2O3MgO or MgO is used for nucleation and precipitation, and the nucleation energy is reduced. The TiN continues to be in fine Al during the solidification process2O3MgO or MgO is used as nucleation and precipitation to make TiN inclusion fine and dispersed.
S4, performing LF refining on the inclusion modified molten steel to obtain secondary refined molten steel;
specifically, LF furnace refining is carried out after wire feeding is finished, slagging, temperature regulation, deep desulfurization and alloying are carried out, titanium alloy is added as the last batch, and part of TiN added is fine Al at the steelmaking temperature2O3MgO and MgO as nucleation precipitates due to Al2O3the-MgO and the MgO have small sizes and large quantity, are not easy to aggregate and grow, and the size of the precipitated TiN is small.
And S5, continuously casting the secondary refining molten steel to obtain a casting blank.
The method for producing a cast slab for controlling inclusions in a high titanium steel according to the present invention will be described in detail with reference to examples, comparative examples and experimental data.
Example 1
The steel grade smelted in the embodiment is automobile structural steel, and the main component requirements are shown in the following table:
the smelting adopts a production process of KR + converter + RH + LF + continuous casting, and the capacity of the steel ladle is 210 tons.
The molten steel is subjected to primary aluminum deoxidation during tapping of the converter, 2.1kg/t of aluminum and iron are added into each ton of steel according to the end oxygen content of the converter, the aluminum content in the molten steel is controlled to be 54ppm, and the balanced dissolved oxygen content is controlled to be 12 ppm.
And (3) mainly removing large-size impurities and degassing in the RH refining process, vacuumizing for 5min, reducing the vacuum degree to 67Pa, and controlling the deep vacuum circulation time to be 10 min.
Feeding 300 meters of iron-aluminum-clad magnesium core wire after RH is finished, carrying out deep deoxidation and modifying fine inclusions, wherein the magnesium content in molten steel is controlled at 12ppm, and the aluminum content is controlled at 320 ppm;
the iron-aluminum-coated magnesium core wire has the main structure that the iron-aluminum-coated magnesium core wire is a double-layer outer-skin cladding, the outermost layer is an iron sheet with the thickness of 3mm, the inner layer of the iron sheet is an aluminum sheet with the thickness of 3mm, and the aluminum sheet is internally wrapped with passivated granular magnesium with the diameter of 0.2-0.7 mm;
refining in an LF furnace after wire feeding is finished, slagging, temperature regulation, deep desulfurization and alloying are carried out, titanium alloy is added as the last batch, and part of TiN added is fine Al at the steelmaking temperature2O3MgO and MgO as nucleation precipitates due to Al2O3the-MgO and the MgO have small sizes and large quantity, are not easy to aggregate and grow, and the size of the precipitated TiN is small.
Example 2
The steel grade smelted in the embodiment is automobile structural steel, and the main component requirements are shown in the following table:
the smelting adopts a production process of KR + converter + RH + LF + continuous casting, and the capacity of the steel ladle is 210 tons.
The molten steel is subjected to primary aluminum deoxidation during tapping of the converter, 195kg/t of aluminum iron is added into each ton of steel according to the oxygen content at the end point of the converter, the aluminum content in the molten steel is controlled to be 62ppm, and the balanced dissolved oxygen content is controlled to be 10 ppm.
And (3) mainly removing large-size impurities and degassing in the RH refining process, vacuumizing for 5min, reducing the vacuum degree to 67Pa, and controlling the deep vacuum circulation time to be 10 min.
Feeding 350 m of iron-aluminum-clad magnesium core wire after RH is finished, performing deep deoxidation and modifying fine inclusions, wherein the magnesium content in molten steel is controlled to be 10ppm, and the aluminum content is controlled to be 295 ppm;
the iron-aluminum-coated magnesium core wire has the main structure that the iron-aluminum-coated magnesium core wire is a double-layer outer-skin cladding, the outermost layer is an iron sheet with the thickness of 3mm, the inner layer of the iron sheet is an aluminum sheet with the thickness of 3mm, and the aluminum sheet is internally wrapped with passivated granular magnesium with the diameter of 0.2-0.7 mm;
refining in an LF furnace after wire feeding is finished, slagging, temperature regulation, deep desulfurization and alloying are carried out, titanium alloy is added as the last batch, and part of TiN added is fine Al at the steelmaking temperature2O3MgO and MgO as nucleation precipitates due to Al2O3the-MgO and the MgO have small sizes and large quantity, are not easy to aggregate and grow, and the size of the precipitated TiN is small.
Comparative example 1
The steel grade provided in example 1 was produced by conventional methods.
Comparative example 2
The steel grade provided in example 2 was produced using conventional methods.
Experimental example:
the finished coils obtained in examples 1-2 and comparative examples 1-2 were sampled and tested for properties, and the results are shown in the following table.
From the above table, the size of the TiN inclusions and the oxide inclusions of the finished plate roll prepared by the method provided by the embodiment of the invention is reduced by more than 25%, and the problems that fine micro cracks are generated at the periphery of the hole expansion caused by large size TiN, the hole expansion rate is reduced and the like are avoided.
One or more technical solutions in the embodiments of the present invention at least have the following technical effects or advantages:
(1) according to the method provided by the embodiment of the invention, through the optimization of the whole process of the high titanium steel smelting, most of oxygen content in the molten steel is removed after tapping, and the aluminum content in the molten steel is controlled, so that the subsequent magnesium treatment can be used for performing modification treatment on the inclusion;
(2) the method provided by the embodiment of the invention removes large-size inclusions through RH, and denaturalizes the inclusions by feeding special magnesium wires after RH is finished so as to ensure that Al is contained2O3Conversion to fine Al2O3MgO or MgO, Al susceptible to aggregation2O3Conversion to Al which is less prone to agglomeration2O3-MgO or MgO, reducing the size of inclusions;
(3) the method provided by the embodiment of the invention carries out alloying in the LF furnace refining process, and finally adjusts the titanium alloy, and at the high temperature of more than 1510 ℃, part of TiN is in the form of fine Al2O3MgO or MgO is used for nucleation and precipitation, and the nucleation energy is reduced. The TiN continues to be in fine Al during the solidification process2O3MgO or MgO is used as nucleation to precipitate, so that TiN inclusions are fine and dispersed, and the size of the inclusions is further reduced.
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 (10)
1. A casting blank preparation method for controlling high titanium steel inclusions is characterized by comprising the following steps:
smelting molten iron in a converter, and then tapping to obtain molten steel;
carrying out RH refining on the molten steel to obtain primary refined molten steel;
feeding an iron-aluminum-clad magnesium core wire into the primary refining molten steel to obtain inclusion modified molten steel, wherein the magnesium content in the inclusion modified molten steel is controlled to be 8-15 ppm, and the aluminum content in the inclusion modified molten steel is controlled to be 200-400 ppm;
performing LF refining on the inclusion modified molten steel to obtain secondary refined molten steel;
and continuously casting the secondary refining molten steel to obtain a casting blank.
2. The casting blank preparation method for controlling the high titanium steel inclusion according to claim 1, wherein an iron-aluminum-clad magnesium core wire is fed into the primary refined molten steel to obtain inclusion modified molten steel, and the iron-aluminum-clad magnesium core wire comprises a magnesium core, an aluminum skin layer coated on the magnesium core and an iron sheet layer coated on the aluminum skin layer; the magnesium core comprises passivated granular magnesium, and the content of magnesium in the magnesium core is 200g/m-240 g/m.
3. The method for preparing a billet for controlling inclusions in a high titanium steel according to claim 2, wherein the particle diameter of the magnesium core is 0.2mm to 0.7 mm.
4. The method for preparing a casting blank for controlling inclusions in high titanium steel according to claim 2, wherein the thickness of the aluminum skin layer is 2mm to 3 mm.
5. The method of claim 2, wherein the composition of the iron sheath layer comprises low carbon steel, and the thickness of the iron sheath layer is 2mm to 3 mm.
6. The method for preparing a casting blank for controlling inclusions in a high titanium steel according to claim 1, wherein molten iron is subjected to converter smelting and then tapped to obtain molten iron, aluminum deoxidation is performed during the tapping, the content of aluminum in the molten iron is controlled to be 50ppm to 80ppm, and the content of dissolved oxygen in the molten iron is controlled to be 10ppm to 20 ppm.
7. The casting blank preparation method for controlling inclusions in high titanium steel according to claim 1, wherein RH refining is performed on the molten steel to obtain primary refined molten steel, the degree of vacuum of the RH refining is less than or equal to 100Pa, and the deep vacuum cycle time of the RH refining is controlled to be 10min to 15 min.
8. The casting blank preparation method for controlling the inclusions in the high titanium steel according to claim 1, wherein the inclusion modified molten steel is subjected to LF refining to obtain secondary refined molten steel, and specifically comprises the following steps:
and carrying out slagging, temperature regulation, deep desulfurization and alloying on the inclusion modified molten steel to obtain secondary refined molten steel.
9. The method for preparing a casting blank for controlling inclusions in high titanium steel according to claim 1, wherein molten iron is subjected to converter smelting and then tapped to obtain molten iron, and the molten iron is obtained by KR desulfurization.
10. The method for preparing a casting blank for controlling inclusions in high titanium steel according to claim 1, wherein the secondary refining molten steel is continuously cast to obtain a casting blank, and the chemical composition of the casting blank comprises, in mass fraction: c: 0.05% -0.08%, Si: 0.27% -0.75%, Mn: 1.5% -1.75%, P: less than or equal to 0.018%, S: less than or equal to 0.005, Al: 0.015% -0.045%, Ti: 0.11% -0.14%, N: less than or equal to 0.005 percent.
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