CN114807727A - Cord steel and method for controlling plasticization of inclusions in cord steel - Google Patents
Cord steel and method for controlling plasticization of inclusions in cord steel Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 140
- 239000010959 steel Substances 0.000 title claims abstract description 140
- 238000000034 method Methods 0.000 title claims abstract description 67
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 56
- 238000010079 rubber tapping Methods 0.000 claims abstract description 45
- 238000007664 blowing Methods 0.000 claims abstract description 33
- 239000003607 modifier Substances 0.000 claims abstract description 28
- 238000003756 stirring Methods 0.000 claims abstract description 27
- 229910052742 iron Inorganic materials 0.000 claims abstract description 25
- 238000007670 refining Methods 0.000 claims abstract description 16
- 150000001339 alkali metal compounds Chemical class 0.000 claims abstract description 13
- 238000003723 Smelting Methods 0.000 claims abstract description 12
- 238000005266 casting Methods 0.000 claims abstract description 5
- 239000002893 slag Substances 0.000 claims description 62
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 22
- 239000010936 titanium Substances 0.000 claims description 17
- 229910052782 aluminium Inorganic materials 0.000 claims description 15
- 229910000519 Ferrosilicon Inorganic materials 0.000 claims description 14
- 239000012535 impurity Substances 0.000 claims description 14
- 229910052719 titanium Inorganic materials 0.000 claims description 14
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 12
- 238000009749 continuous casting Methods 0.000 claims description 12
- 229910052760 oxygen Inorganic materials 0.000 claims description 12
- 229910000272 alkali metal oxide Inorganic materials 0.000 claims description 11
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims description 9
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 9
- 239000001301 oxygen Substances 0.000 claims description 9
- 229910052799 carbon Inorganic materials 0.000 claims description 7
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 7
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 7
- 238000005275 alloying Methods 0.000 claims description 6
- 238000006477 desulfuration reaction Methods 0.000 claims description 6
- 230000023556 desulfurization Effects 0.000 claims description 6
- 229910052748 manganese Inorganic materials 0.000 claims description 6
- 239000011572 manganese Substances 0.000 claims description 6
- 229910052717 sulfur Inorganic materials 0.000 claims description 6
- 229910018068 Li 2 O Inorganic materials 0.000 claims description 5
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 5
- 229910045601 alloy Inorganic materials 0.000 claims description 5
- 239000000956 alloy Substances 0.000 claims description 5
- 230000000903 blocking effect Effects 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 5
- 229910052710 silicon Inorganic materials 0.000 claims description 5
- 239000011863 silicon-based powder Substances 0.000 claims description 5
- 230000014759 maintenance of location Effects 0.000 claims description 4
- 229910052708 sodium Inorganic materials 0.000 claims description 3
- 229910000288 alkali metal carbonate Inorganic materials 0.000 claims description 2
- 150000008041 alkali metal carbonates Chemical class 0.000 claims description 2
- 230000007547 defect Effects 0.000 abstract description 2
- 238000009776 industrial production Methods 0.000 abstract description 2
- 238000009628 steelmaking Methods 0.000 abstract description 2
- 229910004298 SiO 2 Inorganic materials 0.000 description 19
- 238000002844 melting Methods 0.000 description 13
- 230000008018 melting Effects 0.000 description 13
- 239000000463 material Substances 0.000 description 11
- 239000000047 product Substances 0.000 description 10
- 238000004519 manufacturing process Methods 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 238000005096 rolling process Methods 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 2
- 235000011941 Tilia x europaea Nutrition 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 230000003749 cleanliness Effects 0.000 description 2
- 239000004571 lime Substances 0.000 description 2
- 229910052749 magnesium Inorganic materials 0.000 description 2
- 239000011777 magnesium Substances 0.000 description 2
- -1 magnesium aluminate Chemical class 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 229910052596 spinel Inorganic materials 0.000 description 2
- 239000011029 spinel Substances 0.000 description 2
- 230000002194 synthesizing effect Effects 0.000 description 2
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 229910000720 Silicomanganese Inorganic materials 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 239000010436 fluorite Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 229920013754 low-melting plastic Polymers 0.000 description 1
- CSJDCSCTVDEHRN-UHFFFAOYSA-N methane;molecular oxygen Chemical compound C.O=O CSJDCSCTVDEHRN-UHFFFAOYSA-N 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- 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
- 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
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/076—Use of slags or fluxes as treating agents
-
- 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
- C22C38/04—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
- C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
A cord steel and a method for controlling the plasticization of inclusions in the cord steel belong to the technical field of steel making, and overcome the defects of poor deformation capability of inclusions, narrow control window of industrial production, large control difficulty and the like in the prior art. The cord steel inclusion plasticity control method comprises the following steps: step 1, KR molten iron pretreatment; step 2, smelting; step 3, tapping control: adding a modifier when tapping 60-80%, wherein the modifier comprises an alkali metal compound, and the addition amount of the modifier is 1.0-2.5 kg/t; the bottom blowing flow in the tapping process is 1000-; after the steel tapping is finished, stirring for 3-5min at the bottom blowing flow rate of 600-1000 NL/min; step 4, LF refining, wherein the bottom blowing flow is 100-200NL/min, and after slagging is finished, soft stirring treatment is carried out, wherein the soft stirring bottom blowing flow is 30-80 NL/min; and 5, continuously casting.
Description
Technical Field
The invention belongs to the technical field of steel making, and particularly relates to a cord steel and a cord steel inclusion plasticizing control method.
Background
The cord steel is widely applied to the manufacturing industry and is an indispensable product for various automobile, truck, airplane radial tires and other rubber framework materials. With the development of the society, especially the light weight is required in the automobile industry, the cord steel wires are required to be thinner and thinner, the strength is also required to be higher and higher, and the requirements of the tire on the use stability, the service life, the safety and the like are extremely high. Therefore, higher demands are also made on the quality of the cord steel. It is known that inclusions are one of the key indexes affecting the quality of the cord steel, and particularly, the inclusions with unchanged shape and poor plasticity have the greatest influence on the drawing performance and the use stability of the cord steel.
The control of high-melting-point alumina and magnesium aluminate spinel inclusions in the cord steel is mainly controlled from the aspects of refractory materials, alloys and the like, and meanwhile, low-alkalinity acid slag is used for reducing the total aluminum content of molten steel, so that the aim of reducing the brittle inclusions of alumina and magnesium aluminate spinel is fulfilled. Silicate inclusions formed by deoxidation products and refining slag are mainly controlled by two ways at present, one is to control the inclusions in the traditional SiO 2 -MnO-Al 2 O 3 SiO 2 2 -CaO-Al 2 O 3 Is a low melting point region, as provided in Chinese patent 201510631871.8, which is mainly used to control SiO 2 -MnO-Al 2 O 3 Is a silicomanganese deoxidation product and SiO 2 -CaO-Al 2 O 3 The molten steel and the refining slag reaction product are mingled in two low-melting plastic zones, the melting point of the inclusion is lower (less than or equal to 1400 ℃), and the deformability is better. But the method is lowThe component range of the melting point region is narrow, and the precise control of the inclusion component in the low melting point region is difficult to ensure. In addition, although the melting point of the inclusion is low, CaO and Al in the inclusion are contained 2 O 3 The content of the equal components is higher, and the deformation capability of the inclusions in the process of rolling and drawing the wire rod is poor.
The other is to control the inclusion at high SiO 2 SiO of component (A) 2 MnO based, controlling inclusions to SiO 2 MnO series low-melting-point inclusions have good deformation performance in the process of rolling and drawing the wire rod. However, the MnO component content in the inclusions in the method is required to be more than or equal to 20 percent, the MnO component can be reduced due to the fact that the cord steel contains higher Si and C elements, the content control is unstable, and the CaO component can easily enter molten steel, so that the inclusions are converted into SiO 2 The CaO-MnO system has a narrow control window in industrial mass production and a large difficulty in controlling the smelting process.
Disclosure of Invention
Therefore, the invention aims to overcome the defects of poor deformation capability of inclusions, narrow control window of industrial production and high control difficulty in the prior art, and provides a cord steel and a method for controlling the plasticization of the inclusions.
Therefore, the invention provides the following technical scheme.
The invention provides a cord steel inclusion plasticity control method, which comprises the following steps:
step 1, KR molten iron pretreatment;
step 2, smelting;
step 3, tapping control:
filling partial carbon powder into a steel ladle and then tapping; adding low-titanium low-aluminum ferrosilicon and manganese metal for deoxidation alloying when 15-35% of steel is tapped, wherein the addition amount of the low-titanium low-aluminum ferrosilicon is 4.5-10.0kg/t, the addition amount of the manganese metal is 4.0-6.5kg/t, adding a modifier when 60-80% of the steel is tapped, the modifier comprises an alkali metal compound, the addition amount of the modifier is 1.0-2.5kg/t, and adding the rest carbon powder after tapping is finished; the bottom blowing flow in the tapping process is 1000-; after steel tapping is finished, stirring for 3-5min at the bottom blowing flow rate of 600-1000NL/min, and adding silicon carbide to be spread on the surface of the molten steel after the bottom blowing stirring is finished;
the low-titanium low-aluminum ferrosilicon contains less than or equal to 0.015 wt% of Ti and less than or equal to 0.01 wt% of Al;
step 4, LF refining:
heating and adjusting molten steel components, adding pre-melted slag for slagging after the temperature and the molten steel components reach the standard, starting an electrifying and heat-preserving mode in the pre-melted slag adding process, wherein the bottom blowing flow is 100-200NL/min, and carrying out soft stirring treatment after slagging is finished, wherein the bottom blowing flow of the soft stirring is 30-80 NL/min;
and 5, continuously casting.
Further, the modifier is added in the form of synthetic slag balls, and the synthetic slag balls comprise the modifier and a shell;
preferably, the alkali metal compound comprises an alkali metal carbonate and/or an alkali metal oxide;
more preferably, the alkali metal compound comprises Li 2 CO 3 And also includes Na 2 O、K 2 At least one of O.
Further, at least one of the conditions (1) to (5) is satisfied:
(1) the modifier comprises, in weight percent, Li 2 CO 3 ：45-50％，Na 2 O and/or K 2 O: 40-45%, silicon powder 5-15%, and other inevitable impurity components;
(2) the modifier has a density of 1.5-2.5g/cm 3 The mass ratio of the modifier with the granularity less than or equal to 0.03mm and more than 0.1mm is less than 10 percent, and the mass ratio of the modifier with the granularity less than or equal to 0.1mm and more than 0.03mm is more than or equal to 90 percent;
(3) the shell is spherical;
(4) the thickness of the shell is 0.15-0.35mm, the inner diameter of the shell is 10-50mm,
(5) the shell comprises the following main components in percentage by weight: 0.003-0.008 percent, less than or equal to 0.0035 percent of C, less than or equal to 0.030 percent of Si, and the mass percent of Mn: 0.2-0.4%, and the balance of Fe and inevitable impurity elements.
Further, the cord steel comprises the following components in percentage by mass: c: 0.70% -0.95%, S: 0.25-0.55%, Mn: 0.40 to 0.65 percent of the total weight of the alloy, less than or equal to 0.016 percent of P, less than or equal to 0.015 percent of S, and the balance of Fe and other inevitable impurities.
Further, the step 1 comprises: and (3) conveying the molten iron to KR for desulfurization treatment, wherein the temperature of the desulfurized molten iron is more than or equal to 1380 ℃, and the molten iron comprises the following components in percentage by weight: 4.30 to 4.65 percent of C, 0.25 to 0.60 percent of Si and less than or equal to 0.0050 percent of S.
Further, the step 2 comprises: controlling the temperature of the molten steel tapped from the converter or the electric furnace to 1650-: o is less than or equal to 0.050 percent, C is more than or equal to 0.050 percent, P is less than or equal to 0.015 percent, and S is less than or equal to 0.010 percent;
preferably, the method also comprises smelting by adding molten iron and scrap steel into a converter or an electric furnace, wherein the mass ratio of the scrap steel is 5-10%.
Further, the step 3 satisfies at least one of the conditions (1) to (3):
(1) the steel tapping adopts the operation of sliding plate slag blocking and steel retention, and preferably, the steel retention amount is 2-4 t;
(2) carbon powder is filled into the steel ladle before tapping, and the mass of the carbon powder is 20-40% of the total mass of the carbon powder; the mass of the added total carbon powder is 7.5-10.5 kg/t;
(3) the added silicon carbide is 1.5-2.5kg/t and is evenly spread on the surface of the molten steel.
Further, the step 4 satisfies at least one of the conditions (1) to (4):
(1) the pre-melted slag comprises the main components of SiO in percentage by weight 2 : 45-50%, CaO: 40-45%, MgO: 5-10%, and the rest is inevitable impurity components;
(2) electrifying to heat up in the process of adding premelting slag, wherein the heating speed is 1-2 ℃/min;
(3) the feeding speed of the pre-melted slag is 300-500kg/min, and the total feeding amount is 1.2-1.8 t;
(4) the soft stirring time is more than 15 min.
Further, the content of the main component SiO of the inclusion in the molten steel of the continuous casting tundish 2 ：40-60％、MnO：10-20％、Li 2 O+Na 2 O or Li 2 O+K 2 O：5-15％、CaO+Al 2 O 3 Less than or equal to 15 percent and other inevitable components;
the total oxygen content of the molten steel of the continuous casting tundish is less than 20 ppm.
The invention also provides the cord steel prepared by the cord steel inclusion plasticity control method.
And after the pre-melted slag is completely added, the slag forming is completed after the pre-melted slag is melted.
The technical scheme of the invention has the following advantages:
1. the invention provides a cord steel inclusion plasticity control method, which comprises the following steps: step 1, KR molten iron pretreatment; step 2, smelting; step 3, tapping control: filling partial carbon powder into a steel ladle and then tapping; adding low-titanium low-aluminum ferrosilicon and manganese metal for deoxidation alloying when tapping 15-35%, wherein the addition amount of the low-titanium low-aluminum ferrosilicon is 4.5-10.0kg/t, the addition amount of the manganese metal is 4.0-6.5kg/t, adding a modifier when tapping 60-80%, wherein the modifier comprises an alkali metal compound, the addition amount of the modifier is 1.0-2.5kg/t, and adding the rest carbon powder when tapping is finished; the bottom blowing flow in the tapping process is 1000-; after steel tapping is finished, stirring for 3-5min at the bottom blowing flow rate of 600-1000NL/min, and adding silicon carbide to be spread on the surface of the molten steel after the bottom blowing stirring is finished; the low-titanium low-aluminum ferrosilicon contains less than or equal to 0.015 wt% of Ti and less than or equal to 0.01 wt% of Al; step 4, LF refining: heating and adjusting molten steel components, adding pre-melted slag for slagging after the temperature and the molten steel components reach the standard, starting an electrifying and heat-preserving mode in the pre-melted slag adding process, wherein the bottom blowing flow is 100-200NL/min, and carrying out soft stirring treatment after slagging is finished, wherein the bottom blowing flow of the soft stirring is 30-80 NL/min; and 5, continuously casting.
The invention introduces alkali metal oxide, designs converter tapping, LF refining deoxidation alloying and slagging process through systematic research under the condition of not influencing cleanliness, and simultaneously matches with a proper bottom blowing system to control inclusions in molten steel into SiO 2 -MnO-M x O (alkali metal oxide) is an ultra-low melting point plastic inclusion. The melting point of the inclusion is stably controlled to be 850-1250 ℃, the inclusion of the type can keep good plasticity in the hot processing process of the wire rod, and the problem of wire breaking of cord steel during drawing can be remarkably reduced.
Pre-adding a part of carbon powder at the bottom of the ladle for deoxidation, so that little molten steel is in the ladle at the initial tapping stage and the ladle is emptiedAnd gas generated by carbon-oxygen reaction can be discharged, so that molten steel cannot boil and overflow, and the generation of alloy deoxidation inclusions is reduced by carbon powder deoxidation. Then adding alkali metal compound while adopting low-titanium low-aluminium ferrosilicon and manganese metal to deoxidize and alloy, and adding no slag-forming material of lime and synthetic slag in the whole course of tapping process so as to prevent CaO and Al 2 O 3 The components enter molten steel, and the deoxidation product is mainly SiO 2 MnO and alkali metal compounds are added, and then the steel ladle bottom blowing strong stirring treatment is matched, so that the rapid and sufficient reaction of the deoxidation product and the alkali metal oxide is promoted, and the ultra-low melting point inclusion is formed.
As the main component of the synthetic slag is CaO, no slag material is generated in the refining and soft stirring process, which is not favorable for adsorbing the inclusion floating up in the molten steel and is unfavorable for cleanliness, and the phenomenon that the slag pollutes the molten steel to cause the content of the CaO component in the inclusion to rise is avoided. In the refining process, the power-on temperature rise and the molten steel component adjustment stage are not added with slag forming materials, the bottom blowing is relatively large in the stage, the slag entrapment can be reduced without adding the slag forming materials, the acidic pre-melted slag is accurately added after the components and the temperature reach the standard, and meanwhile, the reasonable power-on mode and the bottom blowing are designed, so that the pre-melted slag is rapidly melted, and the slag-metal reaction and the slag entrapment are reduced.
Through the research of the technological technology of the system, the influence of the slag components on the inclusion composition and the inclusion modification effect is greatly reduced, and CaO and Al with high melting points are avoided 2 O 3 The components with high melting points enter molten steel to influence the composition of inclusions, and ensure that the ultra-low melting point plastic inclusions mainly comprising deoxidation products and alkali metal oxides are obtained. The inclusion has very high plasticity and strong deformability in the hot working process of steel rolling and wire rods, and has great significance for promoting the quality of high-end wire rod products. The technical scheme of the industrial mass production of the alkali metal oxide is established, and the technical support is provided for the stable application of the industrial mass production.
2. The invention provides a cord steel inclusion plasticity control method, wherein the alkali metal compound comprises Li 2 CO 3 And also includes Na 2 O、K 2 At least one of O. After adding the alkali metal compound to the molten steel, subjecting the molten steel to high temperature, Li 2 CO 3 Decomposition into Li 2 O and CO 2 The dispersion of the modifier is facilitated, and the rapid and sufficient reaction of the deoxidation product and the alkali metal oxide is promoted.
3. According to the cord steel inclusion plasticity control method provided by the invention, the operation of sliding plate slag blocking and steel retaining is adopted in steel tapping, so that converter slag is prevented from entering a steel ladle, and CaO, MgO and Al are reduced 2 O 3 And carrying out equal component.
4. The invention provides a cord steel inclusion plasticity control method, wherein the modifier comprises Li in percentage by weight 2 CO 3 ：45-50％，Na 2 O or K 2 O: 40-45%, silicon powder 5-15%, and other inevitable impurity components. The modifier comprises alkali metal compound and silicon powder, and after the modifier is added into molten steel, the silicon powder and oxygen in the molten steel form SiO 2 Alkali metal oxide and SiO formed 2 The contact probability of (2) is high, and the generation of the target inclusion of the present invention can be further promoted.
5. The invention provides a cord steel inclusion plasticity control method, wherein the pre-melted slag comprises the main components of SiO in percentage by weight 2 : 45-50%, CaO: 40-45%, MgO: 5-10%, and the rest is inevitable impurity components; the feeding speed of the pre-melted slag is 300-500 kg/min. The slag melting speed is ensured by matching with control of the slag adding speed and the power-on mode, and excessive temperature rise or excessive temperature drop is avoided.
Detailed Description
The following examples are provided to further understand the present invention, not to limit the scope of the present invention, but to provide the best mode, not to limit the content and the protection scope of the present invention, and any product similar or similar to the present invention, which is obtained by combining the present invention with other prior art features, falls within the protection scope of the present invention.
The examples do not show the specific experimental steps or conditions, and can be performed according to the conventional experimental steps described in the literature in the field. The reagents or instruments used are not indicated by manufacturers, and are all conventional reagent products which can be obtained commercially.
Examples 1 to 6
A cord steel inclusion plasticizing control method comprises the following steps:
step 1, KR molten iron pretreatment: and (3) conveying the molten iron to KR for desulfurization treatment, wherein the parameters of the molten iron after desulfurization are shown in table 1 (namely the parameters of the molten iron charged into the converter).
Step 2, smelting:
a135 t converter is adopted for smelting, and the conditions of molten iron and scrap steel fed into the converter and the control conditions of the end point are shown in tables 1 and 2.
TABLE 1 converter charging iron melt conditions and scrap ratio
TABLE 2 converter tapping end-point control
| Examples | End point temperature,. degree.C | End point of carbon% | End point of oxygen,% | End point P% | End point S% |
| 1 | 1665 | 0.068 | 0.042 | 0.014 | 0.0085 |
| 2 | 1650 | 0.083 | 0.035 | 0.012 | 0.0100 |
| 3 | 1698 | 0.073 | 0.049 | 0.011 | 0.0052 |
| 4 | 1700 | 0.050 | 0.050 | 0.015 | 0.0043 |
| 5 | 1686 | 0.062 | 0.040 | 0.013 | 0.0067 |
| 6 | 1675 | 0.075 | 0.031 | 0.012 | 0.0071 |
Step 3, tapping control:
the operation of sliding plate slag blocking and steel retaining is adopted in steel tapping, the steel retaining amount is 2-4t, 30% of carbon powder is filled in a steel ladle firstly, low-titanium low-aluminum ferrosilicon and metal manganese are added for deoxidation alloying in the steel tapping process of 1/3, synthetic slag balls are added in the steel tapping process of 2/3, the rest carbon powder is added after the steel tapping process is finished, no slag making material is added in the steel tapping process, the steel ladle is stirred by large bottom blowing in the whole process, the medium-strength bottom blowing stirring is carried out after the steel tapping process is finished, and silicon carbide is added after the bottom blowing stirring is finished and is uniformly spread on the surface of molten steel to make slag materials, and the adding amount is shown in table 4. In the low-titanium low-aluminum ferrosilicon added in this embodiment, by mass percent: ti is less than or equal to 0.015 percent, Al is less than or equal to 0.01 percent, and Si: 73-78%, and the balance of Fe and inevitable impurity components.
Examples 1 to 3 Using Li 2 CO 3 With Na 2 O synthetic slag balls, examples 4 to 6 using Li 2 CO 3 And K 2 And O synthesizing slag balls.
TABLE 3 synthetic slag ball parameters
TABLE 4 addition of slag-making materials during tapping of converter
Step 4, LF refining:
the molten steel is conveyed to be refined, the temperature is quickly increased by electrifying, the components of the molten steel are adjusted, the pre-melted slag is added for slagging after the temperature and the components of the molten steel reach the standard, the electrifying and heat-preserving mode is started in the feeding process, the bottom blowing flow is weak bottom blowing, the pre-melted slag is guaranteed to be uniformly melted and not to be involved in the molten steel, and the soft stirring treatment is carried out after slagging is completed.
TABLE 5 refining Process parameter control
TABLE 6 composition of premelted slag,% by weight
| Examples | SiO 2 | CaO | MgO | The balance being impurities |
| 1 | 45.0 | 41.5 | 10.0 | 3.5 |
| 2 | 48.5 | 40.6 | 8.6 | 2.3 |
| 3 | 50.0 | 43.2 | 5.0 | 1.8 |
| 4 | 47.1 | 45.0 | 5.8 | 2.1 |
| 5 | 46.8 | 43.5 | 7.8 | 1.9 |
| 6 | 49.2 | 43.3 | 6.1 | 1.4 |
And 5, carrying to continuous casting.
The content of the main component SiO of the inclusions in the molten steel of the continuous casting tundish obtained by the production method 2 : 50-60%, MnO: 10-20%, alkali metal oxide: 5-15 percent of CaO + Al 2 O 3 Less than or equal to 15 percent and other inevitable components. Wherein the inclusion in examples 1 to 3 was SiO 2 -MnO-Li 2 O-Na 2 The inclusions of examples 4 to 6 were SiO 2 -MnO-Li 2 O-K 2 O-type inclusions. The total oxygen content of the molten steel in the continuous casting tundish is shown in Table 7.
TABLE 7 total oxygen content of molten steel in continuous casting tundish
| Examples | 1 | 2 | 3 | 4 | 5 | 6 |
| T.O，ppm | 19.5 | 12.8 | 15.6 | 13.5 | 11.7 | 17.3 |
Examples 7 to 12
A cord steel inclusion plasticizing control method comprises the following steps:
step 1, KR molten iron pretreatment: and (3) conveying the molten iron to KR for desulfurization treatment, wherein the parameters of the molten iron after desulfurization are shown in table 1 (namely the parameters of the molten iron charged into the converter).
Step 2, smelting:
the conditions of molten iron and scrap steel fed into the electric furnace and the end point control conditions are shown in tables 8 and 9 when a 100-ton electric furnace is used for smelting.
TABLE 8 molten iron charging condition and scrap ratio of electric furnace
| Examples | Temperature, C | C，％ | Si，％ | S，％ | Steel scrap ratio% |
| 7 | 1390 | 4.50 | 0.25 | 0.0025 | 6 |
| 8 | 1410 | 4.46 | 0.60 | 0.0026 | 5 |
| 9 | 1380 | 4.61 | 0.37 | 0.0015 | 10 |
| 10 | 1405 | 4.30 | 0.55 | 0.0037 | 8 |
| 11 | 1396 | 4.65 | 0.39 | 0.0017 | 9 |
| 12 | 1385 | 4.56 | 0.45 | 0.0021 | 7 |
TABLE 9 electric furnace tapping end point control
| Examples | End point temperature,. degree.C | End point of carbon% | End point of oxygen,% | End point P% | End point S% |
| 7 | 1675 | 0.088 | 0.032 | 0.013 | 0.0075 |
| 8 | 1658 | 0.097 | 0.028 | 0.015 | 0.0030 |
| 9 | 1650 | 0.106 | 0.035 | 0.012 | 0.0052 |
| 10 | 1696 | 0.068 | 0.043 | 0.011 | 0.0095 |
| 11 | 1700 | 0.050 | 0.050 | 0.014 | 0.0028 |
| 12 | 1670 | 0.085 | 0.031 | 0.012 | 0.0046 |
Step 3, tapping control:
the electric furnace smelting tapping adopts the operation of sliding plate slag blocking and steel retaining, the steel retaining amount is 2-4t, 30% carbon powder is firstly filled in a ladle, low-titanium low-aluminum ferrosilicon and metal manganese are added for deoxidation alloying when the steel is tapped 1/3, synthetic slag balls are added when the steel is tapped 2/3, the rest carbon powder is added when the steel is tapped, no slag-making material is added in the tapping process, the ladle is stirred by large bottom blowing in the whole process, the medium-strength bottom blowing stirring is carried out when the steel is tapped, silicon carbide is added after the bottom blowing stirring is finished and is uniformly spread on the surface of molten steel, and the adding amount of the slag-making material is shown in table 11. In the low-titanium low-aluminum ferrosilicon added in this embodiment, by mass percent: ti is less than or equal to 0.015 percent, Al is less than or equal to 0.01 percent, and Si: 73-78%, and the balance of Fe and inevitable impurity components.
Examples 7 to 9 Using Li 2 CO 3 With Na 2 O synthetic slag balls, examples 10 to 12 using Li 2 CO 3 And K 2 And O synthesizing slag balls.
TABLE 10 synthetic slag ball parameters
TABLE 11 charging of slag-forming materials during tapping of electric furnace
Step 4, LF refining:
the molten steel is conveyed to refining, the temperature is quickly increased by electrifying, the components of the molten steel are adjusted, pre-melted slag is added for slagging after the temperature and the components of the molten steel reach the standard, the electrifying and heat-preserving mode is started in the feeding process, the bottom blowing flow is weak bottom blowing, the pre-melted slag is guaranteed to be uniformly melted and is not involved in the molten steel, and soft stirring treatment is carried out after slagging is completed.
TABLE 12 refining Process parameter control
TABLE 13 composition of premelted slag,% by weight
| Examples | SiO 2 | CaO | MgO | The balance being impurities |
| 7 | 46.5 | 40.3 | 9.3 | 3.9 |
| 8 | 49.3 | 42.5 | 5.6 | 2.6 |
| 9 | 48.7 | 41.6 | 8.2 | 1.5 |
| 10 | 47.1 | 44.2 | 6.6 | 2.1 |
| 11 | 46.8 | 45 | 5.9 | 2.3 |
| 12 | 50 | 42.5 | 5.8 | 1.7 |
And 5, carrying to continuous casting.
The content of the main component SiO of the inclusion in the continuous casting tundish molten steel is obtained by the production method 2 : 50-60%, MnO: 15-20%, alkali metal oxide: 5-15 percent of CaO + Al 2 O 3 Less than or equal to 15 percent and other inevitable components. Wherein the inclusion in examples 7 to 9 was SiO 2 -MnO-Li 2 O-Na 2 The inclusions of examples 10 to 12 were SiO 2 -MnO-Li 2 O-K 2 O-type inclusions. The total oxygen content of the molten steel in the continuous casting tundish is shown in Table 14.
TABLE 14 total oxygen content of molten steel in continuous casting tundish
| Examples | 7 | 8 | 9 | 10 | 11 | 12 |
| T.O，ppm | 17.2 | 11.5 | 13.6 | 16.7 | 12.8 | 16.5 |
Comparative example 1
When the cord steel is produced by the original process, lime, fluorite and synthetic slag are added into the steel discharged by a converter or an electric furnace for slagging, then the steel is transported to refining treatment, after the molten steel, the slag components and the temperature of the molten steel are adjusted to proper positions in the refining treatment, the alkalinity of the slag is 0.85-1.05, and then soft stirring treatment is carried out, wherein the soft stirring time is more than 20 min. The type of the inclusion of the obtained tundish molten steel is mainly SiO 2 -CaO-Al 2 O 3 And SiO 2 -Al 2 O 3 Inclusions of MnO in which SiO 2 40-60% of CaO, 20-40% of MnO, 5-12% of Al 2 O 3 3-15 percent of the inclusion, 3-7 percent of MgO, large fluctuation of the component range of the inclusions, and difficult deformation of the rolling process because part of the inclusions are in a high melting point region.
Test examples
The casting blanks prepared in the examples and the comparative examples are rolled into wire rods with the diameter of 5.5mm by the same process, and then are drawn to prepare wires with the diameter of 0.015 mm. In the drawing process of the wire rod, the method prolongs the extension of the inclusions, the length-width ratio is more than 10, and the wire breakage rate in the drawing or stranding and twisting process is less than or equal to 3.5 times per ton. The original process inclusion of the comparative example 1 has small inclusion deformation, the length-width ratio is 2-9, and the wire breakage rate in the drawing or stranding twisting process is 5-8 times/ton in the drawing process of the wire rod.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the spirit or scope of the invention.
Claims (10)
1. A cord steel inclusion plasticizing control method is characterized by comprising the following steps:
step 1, KR molten iron pretreatment;
step 2, smelting;
step 3, tapping control:
filling partial carbon powder into a steel ladle and then tapping; adding low-titanium low-aluminum ferrosilicon and manganese metal for deoxidation alloying when tapping 15-35%, wherein the addition amount of the low-titanium low-aluminum ferrosilicon is 4.5-10.0kg/t, the addition amount of the manganese metal is 4.0-6.5kg/t, adding a modifier when tapping 60-80%, wherein the modifier comprises an alkali metal compound, the addition amount of the modifier is 1.0-2.5kg/t, and adding the rest carbon powder when tapping is finished; the bottom blowing flow in the tapping process is 1000-; after steel tapping is finished, stirring for 3-5min at the bottom blowing flow rate of 600-1000NL/min, and adding silicon carbide to be spread on the surface of the molten steel after the bottom blowing stirring is finished;
the low-titanium low-aluminum ferrosilicon contains less than or equal to 0.015 wt% of Ti and less than or equal to 0.01 wt% of Al;
step 4, LF refining:
heating and adjusting molten steel components, adding pre-melted slag for slagging after the temperature and the molten steel components reach the standard, starting an electrifying and heat-preserving mode in the pre-melted slag adding process, wherein the bottom blowing flow is 100-200NL/min, and carrying out soft stirring treatment after slagging is finished, wherein the bottom blowing flow of the soft stirring is 30-80 NL/min;
and 5, continuously casting.
2. The cord steel inclusion plasticity control method according to claim 1, wherein the modifier is added in the form of synthetic slag balls, and the synthetic slag balls comprise the modifier and an outer shell;
preferably, the alkali metal compound comprises an alkali metal carbonate and/or an alkali metal oxide;
more preferably, the alkali metal compound comprises Li 2 CO 3 And also includes Na 2 O、K 2 At least one of O.
3. The cord steel inclusion plasticity control method according to claim 2, characterized by satisfying at least one of conditions (1) to (5):
(1) the modifier comprises, in weight percent, Li 2 CO 3 ：45-50％，Na 2 O and/or K 2 O: 40-45%, silicon powder 5-15%, and other inevitable impurity components;
(2) the modifier has a density of 1.5-2.5g/cm 3 The mass ratio of the modifier with the granularity less than or equal to 0.03mm and more than 0.1mm is less than 10 percent, and the mass ratio of the modifier with the granularity less than or equal to 0.1mm and more than 0.03mm is more than or equal to 90 percent;
(3) the shell is spherical;
(4) the thickness of the shell is 0.15-0.35mm, the inner diameter of the shell is 10-50mm,
(5) the shell comprises the following main components in percentage by weight: 0.003-0.008 percent, less than or equal to 0.0035 percent of C, less than or equal to 0.030 percent of Si, and the mass percent of Mn: 0.2-0.4%, and the balance of Fe and inevitable impurity elements.
4. The cord steel inclusion plasticization control method according to any one of claims 1 to 3, characterized in that the cord steel comprises the following components by mass percent: c: 0.70% -0.95%, S: 0.25-0.55%, Mn: 0.40 to 0.65 percent of the total weight of the alloy, less than or equal to 0.016 percent of P, less than or equal to 0.015 percent of S, and the balance of Fe and other inevitable impurities.
5. The cord steel inclusion plasticization control method according to any one of claims 1 to 4, characterized in that the step 1 includes: and (3) conveying the molten iron to KR for desulfurization treatment, wherein the temperature of the desulfurized molten iron is more than or equal to 1380 ℃, and the molten iron comprises the following components in percentage by weight: 4.30 to 4.65 percent of C, 0.25 to 0.60 percent of Si and less than or equal to 0.0050 percent of S.
6. The cord steel inclusion plasticization control method according to any one of claims 1 to 5, characterized in that the step 2 includes: controlling the temperature of the molten steel tapped from the converter or the electric furnace to 1650-: o is less than or equal to 0.050 percent, C is more than or equal to 0.050 percent, P is less than or equal to 0.015 percent, and S is less than or equal to 0.010 percent;
preferably, the method also comprises the step of smelting the molten iron and the scrap steel by adding the molten iron into a converter or an electric furnace, wherein the mass ratio of the scrap steel is 5-10%.
7. The cord steel inclusion plasticity control method according to any one of claims 1 to 6, wherein the step 3 satisfies at least one of conditions (1) to (3):
(1) the steel tapping adopts the operation of sliding plate slag blocking and steel retention, and preferably, the steel retention amount is 2-4 t;
(2) carbon powder is filled into the steel ladle before tapping, and the mass of the carbon powder is 20-40% of the total mass of the carbon powder; the mass of the added total carbon powder is 7.5-10.5 kg/t;
(3) the added silicon carbide is 1.5-2.5kg/t and is evenly spread on the surface of the molten steel.
8. The cord steel inclusion plasticity control method according to any one of claims 1 to 7, wherein the step 4 satisfies at least one of conditions (1) to (4):
(1) the pre-melted slag comprises the main components of SiO in percentage by weight 2 : 45-50%, CaO: 40-45%, MgO: 5-10%, and the rest is inevitable impurity components;
(2) electrifying to heat up in the process of adding premelting slag, wherein the heating speed is 1-2 ℃/min;
(3) the feeding speed of the pre-melted slag is 300-500kg/min, and the total feeding amount is 1.2-1.8 t;
(4) the soft stirring time is more than 15 min.
9. The method for controlling plasticization of inclusions in cord steel according to any one of claims 1 to 8, wherein the inclusion content of the continuous casting tundish molten steel is SiO as a main component 2 ：40-60％、MnO：10-20％、Li 2 O+Na 2 O or Li 2 O+K 2 O：5-15％、CaO+Al 2 O 3 Less than or equal to 15 percent and other inevitable components;
the total oxygen content of the molten steel of the continuous casting tundish is less than 20 ppm.
10. A cord steel produced by the cord steel inclusion plasticity control method according to any one of claims 1 to 9.
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