CN110512046B - Low-cost manufacturing method of deformed steel bar - Google Patents
Low-cost manufacturing method of deformed steel bar Download PDFInfo
- Publication number
- CN110512046B CN110512046B CN201910948936.XA CN201910948936A CN110512046B CN 110512046 B CN110512046 B CN 110512046B CN 201910948936 A CN201910948936 A CN 201910948936A CN 110512046 B CN110512046 B CN 110512046B
- Authority
- CN
- China
- Prior art keywords
- titanium
- content
- nitrogen
- feeding
- tapping
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 93
- 239000010959 steel Substances 0.000 title claims abstract description 93
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 26
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 79
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 51
- 239000001301 oxygen Substances 0.000 claims abstract description 51
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 51
- 238000000034 method Methods 0.000 claims abstract description 50
- 239000002893 slag Substances 0.000 claims abstract description 50
- 238000007664 blowing Methods 0.000 claims abstract description 47
- 239000010936 titanium Substances 0.000 claims abstract description 47
- 238000010079 rubber tapping Methods 0.000 claims abstract description 44
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims abstract description 41
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 41
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 38
- 239000002131 composite material Substances 0.000 claims abstract description 32
- NRTOMJZYCJJWKI-UHFFFAOYSA-N Titanium nitride Chemical compound [Ti]#N NRTOMJZYCJJWKI-UHFFFAOYSA-N 0.000 claims abstract description 30
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 28
- SKKMWRVAJNPLFY-UHFFFAOYSA-N azanylidynevanadium Chemical compound [V]#N SKKMWRVAJNPLFY-UHFFFAOYSA-N 0.000 claims abstract description 28
- 229910001199 N alloy Inorganic materials 0.000 claims abstract description 26
- 238000005406 washing Methods 0.000 claims abstract description 22
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 14
- 238000003723 Smelting Methods 0.000 claims abstract description 14
- 229910052786 argon Inorganic materials 0.000 claims abstract description 14
- 229910052742 iron Inorganic materials 0.000 claims abstract description 7
- 238000007670 refining Methods 0.000 claims abstract description 5
- 238000009749 continuous casting Methods 0.000 claims abstract description 4
- 230000008018 melting Effects 0.000 claims abstract description 4
- 238000002844 melting Methods 0.000 claims abstract description 4
- 238000009489 vacuum treatment Methods 0.000 claims abstract description 4
- 229910052782 aluminium Inorganic materials 0.000 claims description 20
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 20
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 19
- 229910052799 carbon Inorganic materials 0.000 claims description 18
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 8
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 7
- 229910052681 coesite Inorganic materials 0.000 claims description 7
- 229910052593 corundum Inorganic materials 0.000 claims description 7
- 229910052906 cristobalite Inorganic materials 0.000 claims description 7
- 239000000377 silicon dioxide Substances 0.000 claims description 7
- 229910052682 stishovite Inorganic materials 0.000 claims description 7
- 229910052905 tridymite Inorganic materials 0.000 claims description 7
- 229910001845 yogo sapphire Inorganic materials 0.000 claims description 7
- 229910052581 Si3N4 Inorganic materials 0.000 claims description 4
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 claims description 4
- 239000000126 substance Substances 0.000 claims description 4
- 229910000720 Silicomanganese Inorganic materials 0.000 claims description 3
- 239000012535 impurity Substances 0.000 claims description 3
- 238000011084 recovery Methods 0.000 abstract description 12
- 238000007711 solidification Methods 0.000 abstract description 10
- 230000008023 solidification Effects 0.000 abstract description 10
- 229910000859 α-Fe Inorganic materials 0.000 abstract description 10
- 238000005275 alloying Methods 0.000 abstract description 9
- 230000006911 nucleation Effects 0.000 abstract description 6
- 238000010899 nucleation Methods 0.000 abstract description 6
- 229910052751 metal Inorganic materials 0.000 abstract description 5
- 239000002184 metal Substances 0.000 abstract description 5
- 238000005121 nitriding Methods 0.000 abstract description 4
- 230000001276 controlling effect Effects 0.000 description 31
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 238000003756 stirring Methods 0.000 description 4
- 229910000519 Ferrosilicon Inorganic materials 0.000 description 3
- 229910000914 Mn alloy Inorganic materials 0.000 description 3
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 3
- 229910001873 dinitrogen Inorganic materials 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- PYLLWONICXJARP-UHFFFAOYSA-N manganese silicon Chemical compound [Si].[Mn] PYLLWONICXJARP-UHFFFAOYSA-N 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 238000005070 sampling Methods 0.000 description 3
- 238000009628 steelmaking Methods 0.000 description 3
- 229910001069 Ti alloy Inorganic materials 0.000 description 2
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 239000004615 ingredient Substances 0.000 description 2
- 239000011572 manganese Substances 0.000 description 2
- 238000011946 reduction process Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- GFNGCDBZVSLSFT-UHFFFAOYSA-N titanium vanadium Chemical compound [Ti].[V] GFNGCDBZVSLSFT-UHFFFAOYSA-N 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 239000002436 steel type Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 1
Images
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
-
- 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
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/072—Treatment with gases
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Treatment Of Steel In Its Molten State (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The invention discloses a low-cost manufacturing method of deformed steel bar, which comprises the following steps: blast furnace iron melting → converter smelting → argon blowing → LF furnace refining → RH vacuum treatment → continuous casting, after the converter smelting step, feeding a pre-prepared titanium-containing composite cored wire to replace part of vanadium-nitrogen alloy for microalloying treatment; according to the technical scheme provided by the invention, in the smelting and tapping process of the converter, a pre-prepared titanium-containing composite cored wire is fed to replace part of vanadium-nitrogen alloy for microalloying treatment, and the nitriding treatment is carried out on the metal titanium through the treatment processes of tapping oxygen control, deep deoxidation and slag washing, oxygen control before wire feeding, temperature control before wire feeding and wire feeding nitrogen blowing, so that the recovery rate of titanium nitride in molten steel is improved, the solidification of the titanium nitride is facilitated, the nucleation of ferrite grains is promoted, the strength performance of deformed steel is ensured, the consumption of the vanadium-nitrogen alloy is reduced, the alloying cost is reduced, and the low-cost stable and sustainable production of the deformed steel is realized.
Description
Technical Field
The invention relates to the technical field of manufacturing of deformed steel bars, in particular to a low-cost manufacturing method of deformed steel bars.
Background
Deformed steel bar is a common name of hot rolled Ribbed steel bar, and the mark of the deformed steel bar consists of H (Hotrolled hot rolled), R (Ribbed) and B (Bars) and the minimum yield point value. At present, the consumption of Chinese steel still has obvious characteristics in developing countries, the consumption of construction industry and industrial steel accounts for about 90 percent of the total consumption, and the ratio of construction steel exceeds 50 percent. Therefore, the deformed steel bar still remains a single steel type series with the largest domestic production and sales volume within a period of time, the production and sales rate in recent years is measured in hundred million tons, and the deformed steel bar is also one of the most main production varieties of domestic small and medium-sized steel mills due to relatively low equipment requirements and technical difficulty.
In order to ensure that the performance of HRB 400-grade deformed steel bar is qualified, the current popular practice of domestic steel enterprises is to control the strength performance of the deformed steel bar by microalloying C, Si, Mn and other elements and adding vanadium-nitrogen alloy, but the price of the vanadium-nitrogen alloy continuously rises in two years, and the highest price of the vanadium-nitrogen alloy breaks through 80 ten thousand yuan/t, so that the production cost is greatly increased, and the method is not suitable for the current major trend of energy conservation and consumption reduction of the steel industry. In order to reduce the production cost of the deformed steel bar, a new technology is required to support.
Disclosure of Invention
The invention aims to provide a low-cost manufacturing method of deformed steel bar, which solves the problem that the existing deformed steel bar production depends on adding vanadium-nitrogen alloy micro-alloying to control the strength performance of steel, so that the production cost is greatly increased.
In order to achieve the purpose, the invention provides a low-cost manufacturing method of deformed steel bar, and the steelmaking process comprises the following steps: blast furnace iron melting → converter smelting → argon blowing → LF furnace refining → RH vacuum treatment → continuous casting, which is characterized in that: after the converter smelting step, feeding a titanium-containing composite cored wire to replace part of vanadium-nitrogen alloy for microalloying treatment, and specifically comprises the following steps:
(1) tapping and oxygen control: after the silicomanganese of the converter is alloyed, limiting the tapping carbon content of the converter, controlling the tapping carbon to be more than or equal to 0.085 percent and controlling the tapping oxygen [ O ] content to be less than 450 ppm;
(2) deep deoxidation and slag washing: adding pre-prepared aluminum slag and top slag in the tapping process of the converter to carry out deep deoxidation and slag washing operation;
(3) controlling temperature before feeding wires: controlling the temperature of the molten steel to be 1570-1580 ℃ before feeding the titanium composite cored wire;
(4) controlling oxygen before wire feeding: the oxygen content of molten steel O is less than or equal to 8ppm before the titanium composite cored wire is limited to be fed;
(5) wire feeding and nitrogen blowing: feeding a titanium-containing composite cored wire, bottom blowing nitrogen in the whole wire feeding process, controlling the flow of the bottom blowing nitrogen to be 200-250 NL/min, controlling the nitrogen content in steel to be 50-60 ppm, and not allowing bottom blowing argon in the whole wire feeding process.
Preferably, the titanium composite cored wire mainly comprises 38-42% of titanium nitride, 23-27% of silicon nitride, 14-16% of Al and the balance of iron impurity elements.
Preferably, in the deep deoxidation slag washing step, the main components of the aluminum slag comprise 10-15% of simple substance aluminum Al and Al2O335-45% of TiO, 10-20% of CaO, and SiO2The percentage content is 3-7%, and the MgO content is less than 3%.
Preferably, in the deep deoxidation slag washing step, the main components of the top-making slag comprise 35-45% of CaO content and Al2O312-20% of TiO, 4-10% of SiO2The percentage content is 10-15%, the MgO content is 8-10%, and the (T.Fe + MnO) content is less than 2%.
According to the technical scheme provided by the invention, in the smelting and tapping process of the converter, a pre-prepared titanium-containing composite cored wire is fed to replace part of vanadium-nitrogen alloy for microalloying treatment, and the metal titanium is subjected to nitriding treatment through the treatment processes of tapping oxygen control, deep deoxidation and slag washing, oxygen control before wire feeding, temperature control before wire feeding and wire feeding nitrogen blowing, so that the recovery rate of titanium nitride in molten steel is improved, the solidification of the titanium nitride is facilitated, a large amount of titanium nitride is separated out in the solidification process, the nucleation of ferrite grains is promoted, the ferrite grains are refined, the effects of improving the strength and increasing the toughness are achieved, the strength performance of deformed steel is ensured, the vanadium-nitrogen alloy dosage is reduced, and the alloying cost is reduced.
The low-cost manufacturing method of the deformed steel bar has the following beneficial effects:
(1) by controlling the temperature, the oxygen content, the ladle bottom nitrogen blowing and the like before adding Ti, the recovery rate of TiN can be obviously improved, the content of effective Ti in steel can be improved, the solidification of titanium nitride can be facilitated, the strength can be improved, and the toughness can be increased at the same time, so that the strength performance of the deformed steel bar can be ensured;
(2) by adopting a titanium vanadium reduction process and a titanium nitride and vanadium-nitrogen alloy microalloying mode instead of simply adopting vanadium-nitrogen alloy microalloying, the steel-making alloy cost can be reduced by at least more than 60 yuan/t;
(3) the screw-thread steel produced by adopting the microalloying technology of titanium nitride and vanadium-nitrogen alloy is close to the qualification rate index of the original process, and the titanium vanadium reduction process is simple and convenient to operate, strong in operability and easy to control.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a schematic flow chart of an embodiment of a low-cost manufacturing method of deformed steel bar according to the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system 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 system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.
The following example numbers of the present invention are for illustration only and do not represent the merits of the examples.
The usage of the words first, second, third, etcetera herein does not indicate any ordering. These words may be interpreted as names.
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention provides a low-cost manufacturing method of deformed steel bar, which comprises the following steps: the method comprises the steps of blast furnace iron melting → converter smelting → argon blowing → LF furnace refining → RH vacuum treatment → continuous casting, wherein after the converter smelting step, a titanium-containing composite cored wire is fed to replace part of vanadium-nitrogen alloy for microalloying treatment, and the performance of the deformed steel bar is ensured by the technology of replacing vanadium microalloy with titanium microalloy.
Through research, a large amount of titanium nitride is precipitated in the solidification process, so that the nucleation of ferrite grains is promoted, the ferrite grains are refined, and the effects of improving the strength and increasing the toughness are achieved. According to the design concept, the HRB 400-grade deformed steel adopts a titanium nitride and vanadium-nitrogen alloy microalloying mode to replace the mode of only adopting vanadium-nitrogen alloy microalloying, and the specific component design is as shown in the following table 1:
TABLE 1 comparison of composition of "titanium nitride + vanadium-nitrogen" microalloying mode and pure vanadium-nitrogen alloy microalloying
| The ingredients are% | C | Si | Mn | P | S | V | Ti |
| The original components | 0.20-0.25 | 0.45-0.58 | 1.37-1.50 | ≤0.040 | ≤0.040 | 0.017-0.027 | —— |
| Novel ingredient | 0.20-0.25 | 0.45-0.58 | 1.37-1.50 | ≤0.040 | ≤0.040 | 0.008-0.018 | 0.012-0.022 |
The LF furnace shallow dephosphorization refining method of the steelmaking process comprises the steps of tapping oxygen control, deep deoxidation slag washing, temperature control before wire feeding, oxygen control before wire feeding, wire feeding nitrogen blowing and the like, and figure 1 is a flow schematic diagram of one embodiment of the low-cost manufacturing method of deformed steel bars, and specifically comprises the following steps:
s10, tapping and oxygen control: after the silicomanganese of the converter is alloyed, limiting the tapping carbon content of the converter, controlling the tapping carbon to be more than or equal to 0.085 percent and controlling the tapping oxygen [ O ] content to be less than 450 ppm;
if the carbon content of the steel is too low, the oxygen content of the steel is increased, when the carbon content of the steel is less than 0.085 percent, the oxygen content of the steel is increased from 450ppm, the higher the oxygen content of the steel is, the higher the deoxidizing pressure is, the more deep deoxidized aluminum slag is used, and the Al generated by aluminum slag deoxidization is generated along with the increase of the using amount of the deep deoxidized aluminum slag2O3The more, and Al2O3Remaining in molten steel is not easily discharged, resulting in deterioration of the fluidity of molten steel, and thereforeDuring the tapping process, the tapping carbon is controlled to be more than or equal to 0.085 percent and the tapping oxygen [ O ]]The content is less than 450 ppm.
S20, deep deoxidation and slag washing: adding pre-prepared aluminum slag and top slag in the tapping process of the converter to carry out deep deoxidation and slag washing operation; further, the main components of the aluminum slag are simple substance aluminum Al, the content of the simple substance aluminum Al is 10-15%, and Al2O335-45% of TiO, 10-20% of CaO, and SiO2The percentage content is 3-7%, and the MgO content is less than 3%; the main components of the top-making slag comprise 35-45% of CaO and Al2O312-20% of TiO, 4-10% of SiO2The percentage content is 10-15%, the MgO content is 8-10%, and the (T.Fe + MnO) content is less than 2%.
Adding aluminum slag and top slag during tapping of the converter, floating a deoxidation product to be captured and adsorbed by the top slag through proper argon blowing stirring, and performing deep deoxidation slag washing, thereby improving the cleanliness of molten steel.
S30, controlling temperature before feeding wires: controlling the temperature of the molten steel to be 1570-1580 ℃ before feeding the titanium composite cored wire so as to improve the recovery rate of titanium nitride and silicon nitride in the molten steel;
s40, controlling oxygen before wire feeding: the oxygen content of molten steel O is less than or equal to 8ppm before the titanium composite cored wire is limited to be fed;
the control is that titanium is an element which is easy to oxidize, titanium oxide inclusions are easy to generate when the oxygen content of the molten steel is high, the oxygen content of the molten steel is reduced, and the generation probability of titanium oxide can be reduced, so that the recovery rate of titanium nitride in the molten steel is improved, the solidification of the titanium nitride is facilitated, the nucleation of ferrite grains is promoted, and the strength performance of the deformed steel bar is ensured.
S50, feeding yarn and blowing nitrogen: feeding a titanium-containing composite cored wire, bottom blowing nitrogen in the whole wire feeding process, controlling the flow of the bottom blowing nitrogen to be 200-250 NL/min, and controlling the nitrogen content in steel to be 50-60 ppm.
The titanium composite cored wire mainly comprises 38-42% of titanium nitride, 23-27% of silicon nitride, 14-16% of Al and the balance of iron impurity elements.
The original argon gas source of the ladle bottom blowing in the process of feeding the cored wire is switched into nitrogen gas, the bottom blowing nitrogen gas is adopted in the whole process, the nitrogen content in the steel is controlled to be 50-60 ppm through the bottom blowing nitrogen gas, and the bottom blowing argon is not allowed in the whole process of feeding the wire.
A few steel mills have performed tests for controlling the performance of deformed steel bars by adding nitrogen-rich titanium alloy into steel, such as directly adding pure titanium alloy or feeding metal titanium cored wires, but because the adding mode is unreasonable, the recovery rate of Ti is extremely unstable, effective titanium nitride is not formed and is fixedly melted in the steel, and the effect of improving the strength is not achieved.
Compared with the conventional treatment mode, the recovery rate of TiN can be obviously improved by limiting the temperature, the oxygen content, the ladle bottom blowing type and the like before Ti addition, the recovery is stable, the effective Ti content in steel can be improved, and the specific comparison is shown in the following table 2:
TABLE 2 comparison of titanium addition effect between the present invention and the conventional method
| Detailed description of the invention | Disadvantages of | |
| General mode 1 | Directly adding metallic titanium or metallic titanium wire | Titanium is not nitrided, the recovery rate is unstable, and titanium nitride is easy to form and is solid-melted in steel. |
| Conventional mode 2 | Feeding titanium nitride cored wires, wherein the temperature before wire feeding is not limited | Without temperature limitation, when the temperature is more than 1580 ℃, Ti The alloying recovery rate is low, when the temperature is less than 1570 ℃, the wire feeding is carried out The fluidity of the molten steel is liable to deteriorate thereafter. |
| Conventional mode 3 | The oxygen content of the molten steel before feeding the titanium nitride cored wire is not limited | The oxygen content before core wire covering is not limited, and the oxygen content Titanium oxide is easily formed at high amounts. |
| Conventional mode 4 | Argon is generally selected as the blowing type of the ladle bottom | The ladle adopts bottom blowing argon, which is not beneficial to the formation of titanium nitride And solid solution in steel bath |
| The invention | Feeding an autonomously developed composite (titanium nitride) cored wire; before feeding the thread Molten steel temperature, molten steel oxygen content (tapping oxygen and oxygen before core-spun yarn feeding) All limited), ladle bottom blowing type, etc Piece | —— |
According to the technical scheme provided by the invention, in the smelting and tapping process of the converter, a pre-prepared titanium-containing composite cored wire is fed to replace part of vanadium-nitrogen alloy for microalloying treatment, and the metal titanium is subjected to nitriding treatment through the treatment processes of tapping oxygen control, deep deoxidation and slag washing, oxygen control before wire feeding, temperature control before wire feeding and wire feeding nitrogen blowing, so that the recovery rate of titanium nitride in molten steel is improved, the solidification of the titanium nitride is facilitated, a large amount of titanium nitride is separated out in the solidification process, the nucleation of ferrite grains is promoted, the ferrite grains are refined, the effects of improving the strength and increasing the toughness are achieved, the strength performance of deformed steel is ensured, the vanadium-nitrogen alloy dosage is reduced, and the alloying cost is reduced.
The technical solutions of the present invention are described in further detail below with reference to specific examples and drawings, and it should be understood that the following examples are only illustrative of the present invention and are not intended to limit the present invention.
The invention provides a low-cost manufacturing method of deformed steel bar, which is characterized in that a titanium-containing composite cored wire is fed to replace part of vanadium-nitrogen alloy for microalloying treatment after the smelting step of a converter.
HRB 400-grade deformed steel bar production, the converter loading is controlled according to 150-160 tons, active lime is used for converter smelting, and the final slag alkalinity CaO: the ratio of SiO2 is controlled to 3.0-3.5.
Example 1
(1) Tapping and oxygen control: adding silicon-manganese alloy, ferrosilicon and carbon powder to carry out tapping deoxidation alloying treatment at the moment of converter tapping 1/3, wherein accurate carbon drawing is required during end point control, the tapping carbon content is controlled at 0.085%, and the tapping carbon content is controlled at 350 ppm;
(2) deep deoxidation and slag washing: adding pre-prepared aluminum slag and top slag in the tapping process of the converter to carry out deep deoxidation and slag washing operation;
(3) controlling temperature before feeding wires: controlling the temperature of the molten steel to be 1570 ℃ before feeding the titanium composite cored wire;
(4) controlling oxygen before wire feeding: the oxygen content of molten steel O before the titanium composite cored wire is limited to be fed is 8ppm, and whether aluminum slag is supplemented or not is determined according to the oxygen content of the molten steel O;
(5) wire feeding and nitrogen blowing: stirring for 30S after entering a station in a large amount, regulating the nitrogen amount to be in a soft blowing state, measuring, sampling and determining oxygen, feeding the titanium-containing composite cored wire, bottom blowing nitrogen in the whole wire feeding process, controlling the nitrogen flow rate of the bottom blowing nitrogen to be 200NL/min, bottom blowing for 10min, controlling the nitrogen content in steel to be 50ppm, and not allowing bottom blowing argon in the whole wire feeding process.
Example 2
(1) Tapping and oxygen control: adding silicon-manganese alloy, ferrosilicon and carbon powder to carry out tapping deoxidation alloying treatment at the beginning of converter tapping 1/3, wherein accurate carbon drawing is required during end point control, the tapping carbon content is controlled at 0.10%, and is controlled at 400ppm
(2) Deep deoxidation and slag washing: adding pre-prepared aluminum slag and top slag in the tapping process of the converter to carry out deep deoxidation and slag washing operation;
(3) controlling temperature before feeding wires: controlling the temperature of the molten steel before feeding the titanium composite cored wire to be 1575 ℃;
(4) controlling oxygen before wire feeding: limiting the oxygen content of molten steel to 7ppm before feeding the titanium composite cored wire, and determining whether to supplement aluminum slag according to the oxygen content of the molten steel;
(5) wire feeding and nitrogen blowing: stirring for 45S in a large amount after entering a station, regulating the nitrogen amount to be in a soft blowing state, measuring, sampling and determining oxygen, feeding the titanium-containing composite cored wire, bottom blowing nitrogen in the whole wire feeding process, controlling the nitrogen flow rate of the bottom blowing nitrogen to be 220NL/min, controlling the nitrogen content in steel to be 55ppm, and allowing no bottom blowing argon in the whole wire feeding process.
Example 3
(1) Tapping and oxygen control: adding silicon-manganese alloy, ferrosilicon and carbon powder to carry out tapping deoxidation alloying treatment when the converter taps 1/3, wherein accurate carbon drawing is required during end point control, the tapping carbon content is controlled at 0.15 percent and is controlled at 350-450 ppm,
(2) deep deoxidation and slag washing: adding pre-prepared aluminum slag and top slag in the tapping process of the converter to carry out deep deoxidation and slag washing operation;
(3) controlling temperature before feeding wires: controlling the temperature of molten steel before feeding the titanium composite cored wire to be 1580 ℃;
(4) controlling oxygen before wire feeding: the oxygen content of molten steel O before the titanium composite cored wire is limited to be fed is 6ppm, and whether aluminum slag is supplemented or not is determined according to the oxygen content of the molten steel O;
(5) wire feeding and nitrogen blowing: stirring for 60 seconds after entering a station in a large amount, regulating the nitrogen amount to be in a soft blowing state, measuring, sampling and determining oxygen, feeding the titanium-containing composite cored wire, bottom blowing nitrogen in the whole wire feeding process, controlling the nitrogen flow rate of the bottom blowing nitrogen to be 250NL/min, bottom blowing for 14min, controlling the nitrogen content in steel to be 60 ppm, and not allowing bottom blowing argon in the whole wire feeding process.
Compared with the prior art adopting pure vanadium-nitrogen alloy microalloying, the HRB 400-grade deformed steel produced by adopting the titanium nitride and vanadium-nitrogen microalloying mode has the advantages that the strength performance is slightly superior to the prior art level, and the production cost is lower in comparison with the prior art adopting pure vanadium-nitrogen alloy microalloying.
According to the current market price, the price of vanadium-nitrogen alloy is 48.5 ten thousand yuan/t, the cost price of independently developing the composite cored wire is 3 ten thousand yuan/t, the performance value of a new process is even slightly higher than the original process level through the optimization of a microalloying process, and the microalloying cost is saved by 60 yuan/t. The microalloying cost ratio of the new process to the original process is shown in the following table 3:
TABLE 3 comparison table of production cost of new process and original process
According to the technical scheme provided by the invention, in the smelting and tapping process of the converter, a pre-prepared titanium-containing composite cored wire is fed to replace part of vanadium-nitrogen alloy for microalloying treatment, and the titanium metal is subjected to nitriding treatment through the treatment processes of tapping oxygen control, deep deoxidation and slag washing, oxygen control before wire feeding, temperature control before wire feeding and wire feeding nitrogen blowing, so that the recovery rate of titanium nitride in molten steel is improved, the solidification of the titanium nitride is facilitated, a large amount of titanium nitride is separated out in the solidification process, the nucleation of ferrite grains is promoted, the ferrite grains are refined, the effects of improving the strength and increasing the toughness are achieved, the strength performance of deformed steel is ensured, the yield strength is 433-457 MPa, the tensile strength is 615-671 MPa, the vanadium-nitrogen alloy consumption is reduced, the alloying cost is reduced, and the microalloying cost is saved by 60 yuan/t.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (3)
1. A low-cost manufacturing method of deformed steel bar comprises the following steps: blast furnace iron melting → converter smelting → argon blowing → LF furnace refining → RH vacuum treatment → continuous casting, which is characterized in that: after the converter smelting step, feeding a pre-prepared titanium-containing composite cored wire to replace part of vanadium-nitrogen alloy for microalloying treatment, and specifically comprises the following steps:
(1) tapping and oxygen control: after the silicomanganese of the converter is alloyed, limiting the tapping carbon content of the converter, controlling the tapping carbon to be more than or equal to 0.085 percent and controlling the tapping oxygen [ O ] content to be less than 450 ppm;
(2) deep deoxidation and slag washing: adding pre-prepared aluminum slag and top slag in the tapping process of the converter to carry out deep deoxidation and slag washing operation;
(3) controlling temperature before feeding wires: controlling the temperature of the molten steel to be 1570-1580 ℃ before feeding the titanium composite cored wire;
(4) controlling oxygen before wire feeding: the oxygen content of molten steel O is less than or equal to 8ppm before the titanium composite cored wire is limited to be fed;
(5) wire feeding and nitrogen blowing: feeding a titanium-containing composite cored wire, wherein the main components of the titanium-containing composite cored wire are 38-42% of titanium nitride, 23-27% of silicon nitride, 14-16% of Al and iron impurity elements in the rest, bottom blowing nitrogen in the whole wire feeding process, controlling the flow rate of bottom blowing nitrogen to be 200-250 NL/min, controlling the nitrogen content in steel to be 50-60 ppm, and not allowing bottom blowing argon in the whole wire feeding process.
2. A low-cost manufacturing method of deformed steel bar according to claim 1, characterized in that: in the deep deoxidation slag washing step, the main components of the aluminum slag comprise 10-15% of simple substance aluminum Al and Al2O335-45% of TiO, 10-20% of CaO, and SiO2The percentage content is 3-7%, and the MgO content is less than 3%.
3. A low-cost manufacturing method of deformed steel bar according to claim 1, characterized in that: in the deep deoxidation slag washing step, the main components of the top-making slag comprise 35-45% of CaO content and Al2O312-20% of TiO, 4-10% of SiO2The percentage content is 10-15%, the MgO content is 8-10%, and the (T.Fe + MnO) content is less than 2%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910948936.XA CN110512046B (en) | 2019-10-08 | 2019-10-08 | Low-cost manufacturing method of deformed steel bar |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910948936.XA CN110512046B (en) | 2019-10-08 | 2019-10-08 | Low-cost manufacturing method of deformed steel bar |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110512046A CN110512046A (en) | 2019-11-29 |
| CN110512046B true CN110512046B (en) | 2021-08-10 |
Family
ID=68633236
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910948936.XA Active CN110512046B (en) | 2019-10-08 | 2019-10-08 | Low-cost manufacturing method of deformed steel bar |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110512046B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112375870A (en) * | 2020-10-29 | 2021-02-19 | 攀钢集团攀枝花钢铁研究院有限公司 | Cored wire containing titanium and nitrogen and application thereof |
| CN112575142A (en) * | 2020-10-29 | 2021-03-30 | 张家港宏昌钢板有限公司 | Method for improving fluidity of titanium-added deformed steel bar |
| CN116716447B (en) * | 2023-05-23 | 2024-12-03 | 鞍钢股份有限公司 | A smelting method for improving the yield of high-titanium steel metal titanium |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011062012A1 (en) * | 2009-11-17 | 2011-05-26 | 新日本製鐵株式会社 | Steel wire for low-temperature annealing and method for producing the same |
| CN102400052A (en) * | 2011-11-29 | 2012-04-04 | 宁波蓝鼎电子科技有限公司 | Narrow hardenability gear steel and preparation method thereof |
| CN102703813A (en) * | 2012-06-27 | 2012-10-03 | 攀枝花钢城集团有限公司 | Vanadium and titanium compound microalloyed steel bar and production method thereof |
| CN109930056A (en) * | 2019-04-09 | 2019-06-25 | 东北大学 | A kind of 400MPa grades of fine grain spiral and its manufacturing method |
| CN110079728A (en) * | 2019-04-09 | 2019-08-02 | 东北大学 | A kind of good high-strength deformed steel bar muscle of weldability and its manufacturing method |
| CN110257719A (en) * | 2019-08-02 | 2019-09-20 | 武汉钢铁集团鄂城钢铁有限责任公司 | A kind of micro-alloyed with Nb and Ti HRB400 grades of screw-thread steels and its manufacturing method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109355460B (en) * | 2018-12-07 | 2020-10-27 | 董新安 | Titanium-containing composite alloy reinforced cored wire and application thereof in HRB400E deformed steel bar |
-
2019
- 2019-10-08 CN CN201910948936.XA patent/CN110512046B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011062012A1 (en) * | 2009-11-17 | 2011-05-26 | 新日本製鐵株式会社 | Steel wire for low-temperature annealing and method for producing the same |
| CN102400052A (en) * | 2011-11-29 | 2012-04-04 | 宁波蓝鼎电子科技有限公司 | Narrow hardenability gear steel and preparation method thereof |
| CN102703813A (en) * | 2012-06-27 | 2012-10-03 | 攀枝花钢城集团有限公司 | Vanadium and titanium compound microalloyed steel bar and production method thereof |
| CN109930056A (en) * | 2019-04-09 | 2019-06-25 | 东北大学 | A kind of 400MPa grades of fine grain spiral and its manufacturing method |
| CN110079728A (en) * | 2019-04-09 | 2019-08-02 | 东北大学 | A kind of good high-strength deformed steel bar muscle of weldability and its manufacturing method |
| CN110257719A (en) * | 2019-08-02 | 2019-09-20 | 武汉钢铁集团鄂城钢铁有限责任公司 | A kind of micro-alloyed with Nb and Ti HRB400 grades of screw-thread steels and its manufacturing method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110512046A (en) | 2019-11-29 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110229992B (en) | Smelting production method of titanium microalloyed low-cost Q355B steel plate | |
| CN104532146B (en) | A kind of high-strength weathering steel and the method for semisteel smelting high-strength weathering steel | |
| CN110512046B (en) | Low-cost manufacturing method of deformed steel bar | |
| CN103898274B (en) | A kind of ultralow-sulfur steel smelting process | |
| CN104878297B (en) | A kind of production method of low titanium bearing steel GCr15 | |
| CN109082592B (en) | Corrosion-resistant spring steel hot-rolled wire rod with good comprehensive performance and production process thereof | |
| KR20130025383A (en) | Method for controlling titanium content in ultra-low carbon killed steel | |
| CN113817950B (en) | Method for stably controlling nitrogen in LF furnace by using nitrogen | |
| CN103045948B (en) | High-chromium steel and manufacturing method thereof | |
| CN111206177B (en) | Production method of SWRH82B steel with low acid-soluble aluminum content | |
| CN102703644A (en) | Method for producing low-carbon high-chrome alloy steel | |
| CN109252010B (en) | Smelting method for controlling oxidability of IF steel top slag | |
| CN103215410A (en) | Method for improving cleanness of Nb-Ti containing steel | |
| CN115595397B (en) | Accurate nitrogen control method for nitrogen-containing high-strength steel | |
| JP2009167463A (en) | Method for melting Mn-containing ultra-low carbon steel | |
| CN104046738B (en) | A method for smelting ultra-low-sulfur high-chromium steel and the ultra-low-sulfur high-chromium steel prepared therefrom | |
| CN104946845B (en) | Method for producing high-carbon-chrome bearing steel from vanadium-titanium-containing molten iron | |
| CN112195312B (en) | A method for improving the cleanliness of ultra-low carbon steel | |
| CN111172469B (en) | SWRH82B wire rod with low acid-soluble aluminum content | |
| CN110317919B (en) | Low-cost production method of low-carbon enamel steel | |
| CN111455137A (en) | Method for accurately controlling aluminum consumption of IF steel | |
| CN113699313B (en) | Smelting process of titanium-containing stainless steel | |
| CN104060047B (en) | A kind of method of refining of the molten steel for the production of bearing steel | |
| CN104988282B (en) | Deoxidation method for molten steel in converter smelting | |
| CN111088453B (en) | Control method for acid-soluble aluminum in SWRH82B steel |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information | ||
| CB02 | Change of applicant information |
Address after: No. 215, Wuchang Avenue, Hubei, Ezhou, Hubei Applicant after: Baowu group Echeng Iron and Steel Co., Ltd Address before: No. 215, Wuchang Avenue, Hubei, Ezhou, Hubei Applicant before: WUHAN IRON AND STEEL GROUP ECHENG IRON AND STEEL Co.,Ltd. |
|
| GR01 | Patent grant | ||
| GR01 | Patent grant |