CN115074482A - Method for producing hot-rolled ribbed steel bar by using vanadium slag of converter - Google Patents
Method for producing hot-rolled ribbed steel bar by using vanadium slag of converter Download PDFInfo
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- CN115074482A CN115074482A CN202210731704.0A CN202210731704A CN115074482A CN 115074482 A CN115074482 A CN 115074482A CN 202210731704 A CN202210731704 A CN 202210731704A CN 115074482 A CN115074482 A CN 115074482A
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- 239000002893 slag Substances 0.000 title claims abstract description 83
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 69
- 239000010959 steel Substances 0.000 title claims abstract description 69
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 title claims abstract description 50
- 229910052720 vanadium Inorganic materials 0.000 title claims abstract description 49
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 14
- 238000000034 method Methods 0.000 claims abstract description 35
- 238000010079 rubber tapping Methods 0.000 claims abstract description 22
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 20
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 13
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 13
- 238000003723 Smelting Methods 0.000 claims abstract description 11
- 229910052786 argon Inorganic materials 0.000 claims abstract description 10
- 238000007664 blowing Methods 0.000 claims abstract description 8
- 238000005275 alloying Methods 0.000 claims abstract description 6
- 229910045601 alloy Inorganic materials 0.000 claims description 11
- 239000000956 alloy Substances 0.000 claims description 11
- 229910000519 Ferrosilicon Inorganic materials 0.000 claims description 6
- 229910052698 phosphorus Inorganic materials 0.000 claims description 5
- 238000011084 recovery Methods 0.000 claims description 5
- 229910000720 Silicomanganese Inorganic materials 0.000 claims description 3
- 238000009749 continuous casting Methods 0.000 claims description 3
- 229910000640 Fe alloy Inorganic materials 0.000 abstract description 3
- 229910000914 Mn alloy Inorganic materials 0.000 abstract description 3
- XWHPIFXRKKHEKR-UHFFFAOYSA-N iron silicon Chemical compound [Si].[Fe] XWHPIFXRKKHEKR-UHFFFAOYSA-N 0.000 abstract description 3
- PYLLWONICXJARP-UHFFFAOYSA-N manganese silicon Chemical compound [Si].[Mn] PYLLWONICXJARP-UHFFFAOYSA-N 0.000 abstract description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 16
- 229910052710 silicon Inorganic materials 0.000 description 12
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 11
- 239000010703 silicon Substances 0.000 description 11
- 229910001199 N alloy Inorganic materials 0.000 description 9
- SKKMWRVAJNPLFY-UHFFFAOYSA-N azanylidynevanadium Chemical compound [V]#N SKKMWRVAJNPLFY-UHFFFAOYSA-N 0.000 description 9
- 238000009628 steelmaking Methods 0.000 description 9
- 229910052742 iron Inorganic materials 0.000 description 8
- XHCLAFWTIXFWPH-UHFFFAOYSA-N [O-2].[O-2].[O-2].[O-2].[O-2].[V+5].[V+5] Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[V+5].[V+5] XHCLAFWTIXFWPH-UHFFFAOYSA-N 0.000 description 6
- 229910001935 vanadium oxide Inorganic materials 0.000 description 6
- 239000005997 Calcium carbide Substances 0.000 description 5
- CLZWAWBPWVRRGI-UHFFFAOYSA-N tert-butyl 2-[2-[2-[2-[bis[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]amino]-5-bromophenoxy]ethoxy]-4-methyl-n-[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]anilino]acetate Chemical compound CC1=CC=C(N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)C(OCCOC=2C(=CC=C(Br)C=2)N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)=C1 CLZWAWBPWVRRGI-UHFFFAOYSA-N 0.000 description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 238000007599 discharging Methods 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- GNTDGMZSJNCJKK-UHFFFAOYSA-N divanadium pentaoxide Chemical compound O=[V](=O)O[V](=O)=O GNTDGMZSJNCJKK-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000010955 niobium Substances 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 239000011574 phosphorus Substances 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 239000010936 titanium Substances 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 150000001722 carbon compounds Chemical class 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009851 ferrous metallurgy Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 229910017464 nitrogen compound Inorganic materials 0.000 description 1
- 150000002830 nitrogen compounds Chemical class 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 230000033764 rhythmic process Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- GFNGCDBZVSLSFT-UHFFFAOYSA-N titanium vanadium Chemical compound [Ti].[V] GFNGCDBZVSLSFT-UHFFFAOYSA-N 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Classifications
-
- 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
- C21C5/36—Processes yielding slags of special composition
-
- 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
- C21C7/06—Deoxidising, e.g. killing
-
- 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
- C22C33/06—Making ferrous alloys by melting using master alloys
-
- 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)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention discloses a method for producing hot-rolled ribbed steel bars by using converter vanadium slag, which comprises the following steps of 1) controlling the binary basicity R of the slag according to 3.0-3.5 in the converter smelting process, ensuring the dephosphorization rate in a converter to be more than 80%, and ensuring that P in molten steel is less than or equal to 0.030%; 2) controlling the carbon content at the end point of the converter to be 0.08-0.16%, and adding a corresponding molten steel deoxidizer into a steel ladle in the tapping process according to the different carbon contents at the end point, wherein the molten steel deoxidizer comprises CaC 2 : 55-70%, CaO: 15-20%, CaF: 5 to 10 percent. Adjusting the reducibility of the ladle top slag, and then adding a silicon-manganese alloy and a silicon-iron alloy for deoxidation alloying; 3) the slag discharge amount is controlled in the tapping process, the groove on the surface of the slag stopping ball is modified, the depth of the groove is increased from 15mm to 25mm,the width of the groove is increased from 15mm to 20 mm; 4) immediately measuring the thickness of the slag layer by using a scale rod after the molten steel reaches an argon blowing station, wherein the control interval of the thickness of the slag layer is 60-100 mm; 5) and calculating the vanadium increase amount of the discharged slag and the recycled vanadium according to the thickness of the slag layer.
Description
Technical Field
The invention belongs to the technical field of steel production and manufacturing, and relates to a method for producing hot-rolled ribbed steel bars by using vanadium slag of a converter.
Background
The process for producing the hot-rolled ribbed steel bars by most domestic manufacturers adopts a micro-alloying process to produce the hot-rolled ribbed steel bars, and the performance is relatively stable. Commonly used microalloying elements are vanadium (V), titanium (Ti), niobium (Nb), and the like. Because the vanadium microalloying steelmaking smelting yield is high and stable, and the adaptability to the rolling process is strong, the vanadium-nitrogen alloy is widely applied to producing hot-rolled ribbed steel bars by domestic steel works.
Vanadium mainly plays a role in precipitation strengthening and grain refinement in steel. Vanadium is a strong carbide and nitride forming element, and a proper amount of vanadium is added into steel in a solid solution or precipitation mode, so that the strength and toughness of the steel are improved. Vanadium can react with nitrogen and carbon in steel to generate nitrogen compound and carbon compound, the precipitated phase is finer and more dispersed, and the strengthening effect is obviously improved. However, the price fluctuation of vanadium-nitrogen alloy is huge, along with the increasing of market competition, the profit margin of hot-rolled ribbed steel bars is smaller originally, and how to reduce the cost is the target which we pursue all the time. The vanadium content of the molten iron in the factory is 0.06-0.20%, because the affinity of vanadium to oxygen is larger, vanadium in the molten iron at the initial stage of steel making is firstly oxidized into vanadium oxide, the vanadium content of the molten steel at the smelting end point of the factory is 0.0001-0.004% according to statistics, and more than 95% of vanadium in the molten iron enters slag after being oxidized.
Studies in the literature, Zhang Huai, published in "iron and Steel vanadium titanium" at No. 3 of 1991, "equilibrium distribution of vanadium during smelting reduction", and in the literature, Yangyo, Lunzhong, Chuia Keke, et al, published in "iron & Steel" at No. 3 of 2006, "thermodynamic studies on the distribution of vanadium between molten iron and converter slag", indicate that: vanadium in the converter final slag exists in the pentavalent state, i.e. V 2 O 5 。
1. Silicon-reduced vanadium oxide: there are data (Leya. steelmaking [ M ]]Beijing: metallurgical industry press, 2010.) shows: at the steelmaking temperature of 1600 ℃, the affinity of silicon element and oxygen in the molten steel is obviously stronger than that of vanadium element and oxygen, and the silicon element can convert V in the slag 2 O 5 Reducing the reaction product into V.
Vanadium pentoxide (V) as an oxidation product of vanadium 2 O 5 ) Has a melting point of 670 ℃ and is in a liquid state in the steelmaking process. During the tapping process of the converter, the tapping slag is generated due to improper control, and V in the slag 2 O 5 And reducing V into molten steel by elements such as silicon in the alloy deoxidizing element in a high-temperature atmosphere of the molten steel.
The silicon in the molten steel mainly comes from deoxidation alloys such as ferrosilicon, silicon-manganese alloy and the like, and vanadium oxide in the silicon reduction converter slag mainly undergoes the following chemical reaction:
2. the deoxidation capability of calcium carbide and silicon is compared: the main component of the calcium carbide is CaC 2 The deoxidizer is a common deoxidizer for steel making, and is introduced in modern converter steel making (northeast university press, 1998) mainly compiled by Dynasty et al: at the steel-making temperature, the deoxidizing capacity of the calcium carbide is larger than that of silicon.
3. Reduction thermodynamic conditions of vanadium oxide: the principles of ferrous metallurgy (metallurgy press 1990) by Huanghuhu initiative show that: according to the standards of vanadium oxidation reaction, the relation between free energy change and temperature, Gibbs free energy change of vanadium oxide reduced by silicon is less than 0, so that the reactions are feasible in terms of thermodynamics.
4. Reduction kinetic conditions of vanadium oxide: in the tapping process, the molten steel is subjected to chemical reaction under the strong stirring of argon blown from the bottom of a steel ladle, and V in part of furnace slag 2 O 5 The vanadium is reduced and enters the molten steel again, so that the vanadium in the molten steel rises.
The problems are that: p in slag during tapping 2 O 5 And the alloy can be reduced under the strong stirring of bottom-blown argon gas and then enters the molten steel again.
Disclosure of Invention
The invention aims to provide a method for producing hot-rolled ribbed steel bars by using converter vanadium slag, which can recover vanadium from vanadium-containing slag, reduce the addition of vanadium-nitrogen alloy, and reduce the cost because the price of a molten steel deoxidizer is far lower than that of the vanadium-nitrogen alloy.
A method for producing hot-rolled ribbed steel bars by using vanadium slag of a converter comprises the following process routes: adopting converter smelting → ladle argon blowing → square billet continuous casting;
1) in the smelting process of the converter, the binary basicity R of the slag is controlled according to 3.0-3.5, the dephosphorization rate in the converter is ensured to be more than 80%, and P in molten steel is less than or equal to 0.030%; 2) converter and method for producing the sameThe end point carbon content is controlled at 0.08-0.16%, and according to the different end point carbon contents, the corresponding molten steel deoxidizer, namely CaC, is added into the ladle in the tapping process 2 : 55-70%, CaO: 15-20%, CaF: 5-10%, adjusting the reducibility of the ladle top slag, and then adding a silicomanganese alloy and a ferrosilicon alloy for deoxidation alloying; 3) the slag discharge amount is controlled in the tapping process, the groove on the surface of the slag stopping ball is modified, the depth of the groove is increased from 15mm to 25mm on the premise of not changing the radius and the density of the groove, and the width of the groove is increased from 15mm to 20 mm; 4) measuring the thickness of the slag layer by using a scale rod immediately after the molten steel reaches an argon blowing station, wherein the control interval of the thickness of the slag layer is 60-100 mm, and the thickness of the slag layer is not more than 100 mm; 5) and according to the thickness of the slag layer, measuring and calculating the vanadium increase amount of the slag recovery, wherein the corresponding relation between the thickness of the slag layer and the vanadium increase amount is as follows:
the process technology does not need to modify equipment, does not need to increase extra manufacturing cost, and does not bring negative influence on production rhythm and quality control in the field execution process.
The invention idea is as follows: when the vanadium content in molten iron is more than or equal to 0.080 percent and the P content is less than or equal to 0.15 percent, the HRB400E hot-rolled ribbed steel bar is produced by adopting the method. The converter controls the end point carbon content well, and the stability of the oxygen content of molten steel in the converter at the end point is ensured; the slag discharge amount in the tapping process is stably controlled, and the stability of the vanadium-containing slag amount is ensured; at the steelmaking temperature, a molten steel deoxidizer (the main component is calcium carbide CaC) 2 ) The deoxidizing capacity of the steel is larger than that of silicon, the addition amount of a molten steel deoxidizing agent is increased in the tapping process so as to reduce silicon oxidation, vanadium is recovered from vanadium-containing slag, the addition amount of vanadium-nitrogen alloy is reduced, and the price of the molten steel deoxidizing agent is far lower than that of the vanadium-nitrogen alloy, so that the cost is reduced.
The innovation points of the invention are as follows:
1. in the production process of HRB400E hot-rolled ribbed steel bars, vanadium is recovered from vanadium-containing slag of a converter by using a cheap molten steel deoxidizer, the addition of vanadium-nitrogen alloy is reduced, the aim of reducing cost is fulfilled, and a method for recovering vanadium from the vanadium-containing slag of the converter in the tapping process is explored.
2. In order to accurately and stably control the slag discharging amount, the slag stopping ball is improved, and the vanadium increasing amount of the molten steel slag discharging is stable and controllable.
Effect verification:
in a 40-ton converter test on an HRB400E steel 8 furnace, the vanadium content of molten iron is 0.11-0.15%, P: 0.10-0.12%. And (3) test results: the consumption of the molten steel deoxidizer is increased by 0.5-1.0 kg/t, the consumption of the ferrosilicon is increased by 0.2-0.3 kg/t, the consumption of the vanadium-nitrogen alloy can be reduced by 0.10-0.14 kg/t, and the alloy cost is comprehensively reduced by more than 9 yuan/t according to the market alloy price. See in particular the table below.
Detailed Description
A method for producing hot-rolled ribbed steel bars by using vanadium slag of a converter comprises the following process routes: adopting converter smelting → ladle argon blowing → square billet continuous casting;
1) in the smelting process of the converter, the binary basicity R of the slag is controlled according to 3.0-3.5, the dephosphorization rate in the converter is ensured to be more than 80%, the P in the molten steel is less than or equal to 0.030%, and the phosphorus content of the molten steel caused by slag falling in the tapping process is ensured not to exceed the standard; 2) controlling the carbon content at the end point of the converter to be 0.08-0.16%, and adding a corresponding molten steel deoxidizer into a steel ladle in the tapping process according to the different carbon contents at the end point, wherein the molten steel deoxidizer comprises CaC 2 : 55-70%, CaO: 15-20%, CaF: 5 to 10 percent. Adjusting the reducibility of the ladle top slag, and then adding a silicon-manganese alloy and a silicon-iron alloy for deoxidation alloying; 3) the slag discharge amount is controlled in the tapping process, the groove on the surface of the slag stopping ball is modified, the depth of the groove is increased from 15mm to 25mm on the premise of not changing the radius and the density of the groove, and the width of the groove is increased from 15mm to 20 mm; 4) measuring the thickness of the slag layer by using a scale rod immediately after the molten steel reaches an argon blowing station, wherein the control interval of the thickness of the slag layer is 60-100 mm, and the thickness of the slag layer is not more than 100 mm; 5) and according to the thickness of the slag layer, measuring and calculating the vanadium increase amount of the slag recovery, wherein the corresponding relation between the thickness of the slag layer and the vanadium increase amount is as follows:
example (b):
GB/T1499.2-2018 Steel for reinforced concrete part 2: hot rolled ribbed bar the standard requires HRB400E hot rolled ribbed bar chemistry and internal control composition for the specific implementation, see table 1:
TABLE 1 HRB400E national Standard Components and internal control Components for specific implementations
1. In the smelting process of the converter, the binary basicity R of the slag is controlled according to 3.0-3.5, the dephosphorization rate in the converter is ensured to be more than 80%, and the P in the molten steel is less than or equal to 0.030%, so that the phosphorus content of the molten steel is prevented from exceeding the standard due to slag falling in the tapping process.
2. Before tapping, the converter samples and analyzes the end point carbon content of the molten steel, the end point carbon content is controlled to be 0.08-0.16%, according to different end point carbon contents, a corresponding molten steel deoxidizer (the main component is calcium carbide CaC 2) is added in the tapping process, and a silicomanganese alloy and a ferrosilicon alloy are added according to internal control components of Mn and Si for deoxidation alloying. The specific increase amount of the silicon-iron alloy was performed with reference to table 2. Compared with the prior art, the deoxidizer of the molten steel is increased: 0.5-1.0 kg/t, and 0.2-0.3 kg/t of ferrosilicon.
3. In order to stably control the slag discharge amount in the tapping process. The groove on the surface of the slag stopping ball is modified, the depth of the groove is increased from 15mm to 25mm on the premise of not changing the radius and the density of the groove, and the width of the groove is increased from 15mm to 20 mm. By increasing the depth and the width of the groove on the surface of the slag stopping ball, the slag discharging amount in the slag stopping process can be effectively controlled, and the slag discharging amount can be increased to 30-50% compared with that of the original slag stopping ball. The adding time of the slag stopping ball is consistent with the original process, and the slag stopping ball is added into the furnace when the tapping process is carried out to 3/4.
4. And after the molten steel reaches an argon blowing station, immediately measuring the thickness of the slag layer by using a scale rod, wherein the control interval of the thickness of the lower slag layer is 60-100 mm, and is not more than 100mm, otherwise, the recovery rate of the [ C ] and [ Si ] elements in the steel ladle is unstable, and the [ P ] element is easy to exceed the standard.
5. And (3) calculating the vanadium increase amount of the slag layer after slag tapping recovery according to the thickness of the slag layer, wherein the corresponding relation between the thickness of the slag layer and the vanadium increase amount is shown in a table 3.
6. And (4) increasing the vanadium content according to the slag, and reducing the addition of the corresponding vanadium-nitrogen alloy.
Claims (1)
1. A method for producing hot-rolled ribbed steel bars by using vanadium slag of a converter comprises the following process routes: adopting converter smelting → ladle argon blowing → square billet continuous casting; the method is characterized in that:
1) in the smelting process of the converter, the binary basicity R of the slag is controlled according to 3.0-3.5, the dephosphorization rate in the converter is ensured to be more than 80%, and P in molten steel is less than or equal to 0.030%;
2) controlling the carbon content at the end point of the converter to be 0.08-0.16%, and adding a corresponding molten steel deoxidizer into a steel ladle in the tapping process according to the different carbon contents at the end point, wherein the molten steel deoxidizer comprises CaC 2 : 55-70%, CaO: 15-20%, CaF: 5-10%, adjusting the reducibility of the ladle top slag, and then adding a silicomanganese alloy and a ferrosilicon alloy for deoxidation alloying;
3) the slag discharge amount is controlled in the tapping process, the groove on the surface of the slag stopping ball is modified, the depth of the groove is increased from 15mm to 25mm on the premise of not changing the radius and the density of the groove, and the width of the groove is increased from 15mm to 20 mm;
4) measuring the thickness of the slag layer by using a scale rod immediately after the molten steel reaches an argon blowing station, wherein the control interval of the thickness of the slag layer is 60-100 mm, and the thickness of the slag layer is not more than 100 mm;
5) and according to the thickness of the slag layer, measuring and calculating the vanadium increase amount of the slag recovery, wherein the corresponding relation between the thickness of the slag layer and the vanadium increase amount is as follows:
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| CN111979373A (en) * | 2020-07-20 | 2020-11-24 | 河钢股份有限公司承德分公司 | Method for increasing vanadium by microalloying vanadium slag and vanadium-containing iron block |
| CN113652614A (en) * | 2021-09-01 | 2021-11-16 | 新疆八一钢铁股份有限公司 | Smelting method for producing phi 12-25mm HRB500E straight steel bar through microalloying |
| CN114395736A (en) * | 2022-01-16 | 2022-04-26 | 新疆八一钢铁股份有限公司 | Q355B type steel vanadium micro-alloying production method |
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