CN115652196A - Titanium-nitrogen microalloyed HRB400E disc snail and production method thereof - Google Patents
Titanium-nitrogen microalloyed HRB400E disc snail and production method thereof Download PDFInfo
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- NRTOMJZYCJJWKI-UHFFFAOYSA-N Titanium nitride Chemical compound [Ti]#N NRTOMJZYCJJWKI-UHFFFAOYSA-N 0.000 title claims abstract description 61
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 17
- 241000237858 Gastropoda Species 0.000 title claims description 9
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 82
- 239000010959 steel Substances 0.000 claims abstract description 82
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 58
- 229910001199 N alloy Inorganic materials 0.000 claims abstract description 37
- 229910052786 argon Inorganic materials 0.000 claims abstract description 29
- 238000009749 continuous casting Methods 0.000 claims abstract description 28
- 239000002893 slag Substances 0.000 claims abstract description 28
- 238000007664 blowing Methods 0.000 claims abstract description 27
- 238000005266 casting Methods 0.000 claims abstract description 21
- 238000000034 method Methods 0.000 claims abstract description 14
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 11
- 238000003756 stirring Methods 0.000 claims abstract description 9
- 230000008569 process Effects 0.000 claims abstract description 8
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 8
- 238000009826 distribution Methods 0.000 claims abstract description 6
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 6
- 230000001681 protective effect Effects 0.000 claims abstract description 5
- 238000010079 rubber tapping Methods 0.000 claims description 41
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 14
- 229910052799 carbon Inorganic materials 0.000 claims description 14
- 229910045601 alloy Inorganic materials 0.000 claims description 13
- 239000000956 alloy Substances 0.000 claims description 13
- -1 silicon-aluminum-barium Chemical compound 0.000 claims description 9
- NCJRLCWABWKAGX-UHFFFAOYSA-N [Si].[Ca].[Ba] Chemical compound [Si].[Ca].[Ba] NCJRLCWABWKAGX-UHFFFAOYSA-N 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 7
- 238000005096 rolling process Methods 0.000 claims description 6
- 238000009987 spinning Methods 0.000 claims description 6
- 229910052761 rare earth metal Inorganic materials 0.000 claims description 5
- 150000002910 rare earth metals Chemical class 0.000 claims description 5
- 229910000519 Ferrosilicon Inorganic materials 0.000 claims description 4
- 229910000720 Silicomanganese Inorganic materials 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 4
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- 239000002131 composite material Substances 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- 238000002791 soaking Methods 0.000 claims description 3
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 abstract description 36
- 239000010936 titanium Substances 0.000 abstract description 31
- 229910052719 titanium Inorganic materials 0.000 abstract description 30
- SKKMWRVAJNPLFY-UHFFFAOYSA-N azanylidynevanadium Chemical compound [V]#N SKKMWRVAJNPLFY-UHFFFAOYSA-N 0.000 abstract description 6
- 238000003723 Smelting Methods 0.000 abstract description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 11
- 229910052760 oxygen Inorganic materials 0.000 description 11
- 239000001301 oxygen Substances 0.000 description 11
- 230000006872 improvement Effects 0.000 description 8
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 238000005728 strengthening Methods 0.000 description 4
- 238000012795 verification Methods 0.000 description 4
- 229910001069 Ti alloy Inorganic materials 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- 238000005275 alloying Methods 0.000 description 2
- 238000010923 batch production Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 230000008520 organization Effects 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 239000011593 sulfur Substances 0.000 description 2
- 229910052720 vanadium Inorganic materials 0.000 description 2
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 2
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- 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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Abstract
The invention provides a titanium-nitrogen microalloyed HRB400E spiral shell and a production method thereof, relating to the technical field of steel smelting and comprising the following components in percentage by mass: c:0.21-0.25%, si:0.30-0.45%, mn:1.20-1.40%, P:0.019-0.045%, S:0.018 to 0.045%, ti:0.008-0.018%, N:0.005-0.009%, fe:96.5% -97.5%; the method adopts titanium nitrogen microalloying to replace the traditional vanadium nitrogen microalloying, reasonably controls the content of titanium and adjusts the adding mode of the titanium nitrogen alloy, ensures the soft blowing time of an argon blowing station, adopts measures of high-pulling-speed protective slag for continuous casting, opening electromagnetic stirring of a crystallizer, optimizing a water distribution process, protecting and casting a long nozzle and the like, and effectively solves the problems of low yield of titanium after titanium addition, high viscosity of continuous casting molten steel and poor castability.
Description
Technical Field
The invention relates to the technical field of steel smelting, in particular to a titanium-nitrogen microalloyed HRB400E disc spiral and a production method thereof.
Background
The spiral shell is a wire rod, the spiral shell is coiled into a deformed steel bar like the wire rod, the spiral shell has the same binding mode with the common wire rod, but needs to be straightened when in use, the spiral shell on the market is more than 6.5-8.0-10-12-14, and is a building steel material, the titanium nitrogen microalloying HRB400E spiral shell is that titanium nitrogen alloy is added into a steel ladle in the production of the HRB400E spiral shell to completely replace vanadium nitrogen alloy, the alloy cost is reduced, and the mechanical property of the HRB400E spiral shell is improved by microalloying the titanium nitrogen alloy;
in the titanium-nitrogen alloy, titanium is one of chemically very active metal elements, has very strong affinity with nitrogen, oxygen and carbon, and has stronger affinity with sulfur, so that titanium is very easy to react with elements such as oxygen, sulfur, nitrogen and the like in molten steel, and the yield of the titanium element is reduced.
Disclosure of Invention
Aiming at the problems, the invention provides the titanium-nitrogen microalloyed HRB400E disc snail and the production method thereof, and the titanium-nitrogen microalloyed HRB400E disc snail and the production method thereof effectively solve the problems of low yield of titanium after titanium addition, high viscosity of continuous casting molten steel and poor castability.
In order to realize the purpose of the invention, the invention is realized by the following technical scheme: a titanium-nitrogen microalloyed HRB400E coiled spiral comprises the following components in percentage by mass: c:0.21-0.25%, si:0.30-0.45%, mn:1.20-1.40%, P:0.019-0.045%, S:0.018-0.045%, ti:0.008-0.018%, N:0.005-0.009%, fe:96.5 to 97.5 percent.
The further improvement lies in that: comprises the following components in percentage by mass: c:0.22%, si:0.39%, mn:1.30%, P:0.035%, S:0.028%, ti:0.01%, N:0.0073%, fe:97 percent.
A production method of a titanium-nitrogen microalloyed HRB400E coiled material comprises the following steps:
the method comprises the following steps: the converter adopts high-tension carbon, and the carbon content of the steel tapped at the end point is controlled;
step two: the silicon-aluminum-barium and silicon-calcium-barium composite deoxidizer is adopted for strong deoxidation, and a steel ladle is added during tapping;
step three: adding ferrosilicon, silicomanganese and a carburant when tapping is carried out for 1/4, and completely adding alloy when tapping is carried out for 3/4;
step four: after converter tapping is finished, the molten steel tank enters an argon blowing station, titanium-nitrogen alloy is added into the argon blowing station by using an alloy blanking barrel, and the titanium-nitrogen alloy is thrown into the exposed molten steel of a steel ladle blown by argon;
step five: during casting, the continuous casting ladle and the tundish are cast under the protection of a long nozzle, the continuous casting adopts high-casting-speed alkaline covering slag, and a crystallizer is started for electromagnetic stirring;
step six: and (3) hot-feeding the billet into a heating furnace for heating, and then rolling and spinning to obtain a finished product.
The further improvement is that: in the first step, the carbon content of the end-point tapping is controlled to be 0.05-0.18%.
The further improvement is that: in the second step, 0.15-0.35kg/t of silicon-aluminum-barium and 0.10-0.15kg/t of silicon-calcium-barium are prepared and added into a steel ladle when tapping is carried out by the converter.
The further improvement is that: and in the second step, before steel tapping, maintaining the converter tapping hole, and periodically replacing the converter tapping hole, and during steel tapping, tapping by adopting a slag stopping process, and controlling the slag amount to be below 50 mm.
The further improvement is that: and in the fourth step, the molten steel tank enters an argon blowing station, the argon blowing pressure is increased, the molten steel on the liquid level of the molten steel is ensured to be exposed, titanium-nitrogen alloy is put into the exposed molten steel of the steel ladle blown open by the argon, the addition of the titanium-nitrogen alloy is added according to 1.0kg/t of steel, the soft argon blowing time is controlled to be more than or equal to 5min, the molten steel components are homogenized, and 5-8 packages of covering agent are added when the molten steel is discharged from the station.
The further improvement is that: in the fourth step, the titanium-nitrogen alloy contains the following elements: ti:22.1%, si:22.4%, N:12.4%, rare earth: 5 percent.
The further improvement lies in that: in the fifth step, the continuous casting tundish covering slag adopts alkaline covering slag, and the crystallizer covering slag adopts high-pulling-speed low-melting-point covering slag; electromagnetic stirring is started for the crystallizer, the current is 320A-350A, the frequency is 3-5Hz, and the water distribution of the crystallizer is 160m 3 H, the water quantity of the secondary cooling section is 40m 3 The temperature of the molten steel of the tundish is controlled to be 1515-1535 ℃; the casting blank pulling speed is controlled to be 4.2-4.5m/min.
The further improvement lies in that: in the sixth step, when the billet is heated, the temperature of the soaking section is controlled to be 1110-1130 ℃, the rolling temperature is controlled to be 1010-1030 ℃, and the spinning temperature is controlled to be 930-1000 ℃.
The invention has the beneficial effects that:
1. the method adopts titanium nitrogen microalloying to replace the traditional vanadium nitrogen microalloying, reasonably controls the content of titanium and adjusts the adding mode of the titanium nitrogen alloy, ensures the soft blowing time of an argon blowing station, adopts measures of high-pulling-speed protective slag for continuous casting, opening electromagnetic stirring of a crystallizer, optimizing a water distribution process, protecting and casting a long nozzle and the like, and effectively solves the problems of low yield of titanium after titanium addition, high viscosity of continuous casting molten steel and poor castability.
2. The invention adopts titanium-nitrogen alloy to carry out microalloying, fully utilizes the fine grain strengthening and precipitation strengthening of titanium to improve the strength of steel, adopts low titanium component control in component design, ensures the quality of casting blanks under the condition of high continuous casting drawing speed, contains a small amount of rare earth in the titanium-nitrogen alloy, further improves the microalloying capability, eliminates the cracks and the stripping of the casting blanks under the condition of high continuous casting drawing speed by using the titanium-nitrogen alloy, successfully produces HRB400E disc screws in batches, and meets the national standard on the mechanical property of the steel, thereby achieving the purpose of reducing the alloy cost.
Drawings
FIG. 1 is a flow chart of the present invention.
Detailed Description
In order to further understand the present invention, the following detailed description will be made with reference to the following examples, which are only used for explaining the present invention and are not to be construed as limiting the scope of the present invention.
Example one
The embodiment provides a titanium-nitrogen microalloyed HRB400E coiled coil, which comprises the following components in percentage by mass: c:0.21-0.25%, si:0.30-0.45%, mn:1.20-1.40%, P:0.019-0.045%, S:0.018 to 0.045%, ti:0.008-0.018%, N:0.005-0.009%, fe:96.5 to 97.5 percent.
Through tests and organization batch production, the quality of continuous casting billets and steel products meets the national standard requirements, the yield strength is stable, the influence on the time efficiency is less, and the cheap titanium-nitrogen alloy is adopted to replace the vanadium-nitrogen alloy to produce the high-strength hot-rolled ribbed anti-seismic steel bar, so that the supply and demand balance of the condition of vanadium resource shortage can be solved.
Example two
According to the figure 1, the embodiment provides a production method of a titanium-nitrogen microalloyed HRB400E disc spiral, which comprises the following steps:
the converter adopts high-pulling carbon, and the carbon content of the steel tapped at the end point is controlled to be 0.05-0.18%; the control of the end point carbon content of the converter is low, the oxidizability of the molten steel is strong, and the oxygen content of the molten steel is high. If titanium-nitrogen alloy is added during converter tapping, titanium reacts with oxygen, and the yield of titanium element is reduced. Therefore, the converter needs to adopt high carbon drawing to improve the end point carbon content, the tapping carbon is 0.05-0.18%, and the end point oxygen content of the converter is reduced, so that the titanium element yield can be improved;
before tapping, maintaining a converter tapping hole, and periodically replacing the converter tapping hole, and tapping by adopting a slag stopping process during tapping, wherein the slag discharging amount is controlled to be below 50 mm; preparing 0.15-0.35kg/t of silicon-aluminum-barium and 0.10-0.15kg/t of silicon-calcium-barium, strongly deoxidizing by adopting a silicon-aluminum-barium and silicon-calcium-barium compound deoxidizer, and adding a steel ladle when tapping from a converter; the maintenance of a converter steel-tapping hole is enhanced, the converter steel-tapping hole is replaced periodically, the slag blocking process is adopted for steel tapping, the slag tapping is strictly controlled, the slag tapping amount is controlled to be below 50mm, the reaction of oxidizing furnace slag and titanium is reduced, and the yield of titanium alloy is improved;
adding ferrosilicon, silicomanganese and a carburant when tapping is carried out for 1/4, and completely adding alloy when tapping is carried out for 3/4; the invention reduces the oxygen content of the converter molten steel: the carbon at the end point of the converter is improved by 0.05-0.18%, the converter adopts silicon-calcium-barium and silicon-aluminum-barium for deoxidation, the oxygen content of HRB400E disc spiral molten steel entering an argon blowing station is less than or equal to 45PPm, the titanium alloy yield is favorably improved and can reach 50-74%, and the titanium micro-combination requirement can be met; because titanium element has strong oxygen affinity, molten steel must be strongly deoxidized during alloying, so that a composite deoxidizer, namely silicon-aluminum-barium deoxidizer, is required to be adopted for deoxidizing during converter tapping, and then alloy such as carburant, ferrosilicon, silicomanganese and the like is added to reduce the oxygen content of the molten steel. After deoxidation and alloying of converter tapping, the oxygen content of molten steel entering an argon blowing station is reduced to below 45 ppm. Then, titanium-nitrogen alloy is added into the argon blowing station according to the requirement, so that the yield of the titanium element can be stably improved;
after converter tapping is finished, a molten steel tank enters an argon blowing station, argon blowing pressure is improved, molten steel on the liquid level of the molten steel is ensured to be exposed, titanium-nitrogen alloy is thrown into the exposed molten steel of a steel ladle blown by argon by using an alloy discharging barrel, the addition amount of the titanium-nitrogen alloy is added according to 1.0kg/t of steel, the soft argon blowing time is controlled to be more than or equal to 5min, the molten steel components are uniform, and 5-8 bags of covering agent are added when the molten steel is discharged from the station; wherein, the titanium-nitrogen alloy contains the following elements: ti:22.1%, si:22.4%, N:12.4%, rare earth: 5 percent; the invention adopts the design of low titanium components: ti:0.008 to 0.018%, N:0.0050-0.0090%. Titanium nitrogen microalloying is adopted, the influence of titanium element on the quality of a continuous casting billet at a high drawing speed of 4.0m/min is reduced, the requirement of a continuous casting process is met, meanwhile, the titanium content is low, titanium inclusion in steel is reduced, and the castability and inclusion of molten steel meet the requirement; the invention adjusts the adding mode of the steel-making alloy: after the converter tapping is finished, adding the titanium-nitrogen alloy in an argon blowing station, and throwing the titanium-nitrogen alloy into the bare molten steel of the steel ladle, wherein the argon blowing time is guaranteed to be more than or equal to 5 minutes after the alloy is added. After the deoxidizer and the alloy are added into the converter, the oxygen content in the molten steel is reduced to below 45PPm, and then the titanium-nitrogen alloy is added into the blowing station, so that the yield of the titanium alloy can be effectively improved. Meanwhile, the molten steel is added in the exposed part, so that the oxidation of iron oxide in titanium covering slag is avoided, and the titanium yield is more favorably improved. The soft argon blowing time is more than 5 minutes to ensure the even components of the molten steel. The continuous casting ladle and the tundish adopt long water gaps for protecting casting, so that titanium is prevented from being oxidized;
during casting, the continuous casting ladle and the tundish adopt long water gaps for casting protection, secondary oxidation of titanium in molten steel is prevented, so that the yield of titanium elements is improved, the continuous casting tundish covering slag adopts alkaline covering slag, and the crystallizer covering slag adopts high-casting-speed low-melting-point covering slag; electromagnetic stirring is started for the crystallizer, the current is 320A-350A, the frequency is 3-5Hz, and the water distribution of the crystallizer is 160m 3 H, water quantity of the secondary cooling section is 40m 3 H, controlling the temperature of the molten steel in the tundish to be 1515-1535 ℃; controlling the casting blank pulling speed to be 4.2-4.5m/min; the invention eliminates the cracks and the stripping of the continuous casting billet at high drawing speed: optimizing continuous casting cooling control, starting the continuous casting crystallizer to electromagnetically stir and improving the quality of steel billets. And the casting powder is continuously cast at a high casting speed, so that the quality of a casting blank is improved. The method adopts titanium nitrogen to produce the HRB400E disc snail, the mechanical property meets the requirement, and simultaneously, the problems of continuous casting leakage and casting blank square removal under the condition of high casting speed of 4.5m/min are solved;
and (3) hot-feeding the billet into a heating furnace for heating, controlling the temperature of a soaking section to be 1110-1130 ℃, the initial rolling temperature to be 1010-1030 ℃ and the spinning temperature to be 930-1000 ℃ during heating, and then rolling and spinning to obtain a finished product.
Verification example:
verification examples 1 to 30: the titanium-nitrogen alloy is adopted to produce HRB400E coiled snails, the diameter of the HRB400E coiled snails is in a reinforcing steel bar with the specification of 6 mm-10 mm, the chemical components and the percentage thereof are calculated according to the mass percentage as shown in the following table, the titanium-nitrogen addition and the Ti yield of each verification example are measured, and the obtained results are shown in the following table:
from the coiled steel bars of which the finished product specification is 6-10 mm obtained in the verification example, 10 batches of samples are randomly extracted from the steel bars of each specification, and mechanical property tests are respectively carried out, wherein the experimental results are shown in the following table:
the method adopts titanium nitrogen microalloying to replace the traditional vanadium nitrogen microalloying, reasonably controls the content of titanium and adjusts the adding mode of the titanium nitrogen alloy, ensures the soft blowing time of an argon blowing station, adopts measures of high-pulling-speed protective slag for continuous casting, opening electromagnetic stirring of a crystallizer, optimizing a water distribution process, protecting and casting a long nozzle and the like, and effectively solves the problems of low yield of titanium after titanium addition, high viscosity of continuous casting molten steel and poor castability. The invention adopts titanium nitrogen alloy to carry out microalloying, fully utilizes the fine grain strengthening and precipitation strengthening of titanium to improve the strength of steel, adopts low titanium component control in component design, ensures the quality of casting blanks under the condition of continuous casting high drawing speed, simultaneously contains a small amount of rare earth in the titanium nitrogen alloy, further improves the microalloying capability, in addition, the titanium nitrogen alloy must be added in an argon blowing station and added to the bare molten steel of a steel ladle blown away by argon, effectively improves the yield of titanium, leads the yield of titanium to reach 50-74 percent, uses the titanium nitrogen alloy, eliminates the cracks and the stripping of the casting blanks under the condition that the continuous casting drawing speed reaches 4.2-4.5m/min, successfully produces HRB400E disc bolts in batches, leads the mechanical property of the steel to meet the national standard requirement, and achieves the aim of reducing the alloy cost. Through tests and organization batch production, the quality of continuous casting billets and steel products meets the national standard requirements, the yield strength is stable, the influence on the time efficiency is less, and the cheap titanium-nitrogen alloy is adopted to replace the vanadium-nitrogen alloy to produce the high-strength hot-rolled ribbed anti-seismic steel bar, so that the supply and demand balance of the condition of vanadium resource shortage can be solved.
The foregoing shows and describes the general principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. The titanium-nitrogen microalloyed HRB400E disc snail is characterized by comprising the following components in percentage by mass: c:0.21-0.25%, si:0.30-0.45%, mn:1.20-1.40%, P:0.019-0.045%, S:0.018 to 0.045%, ti:0.008-0.018%, N:0.005-0.009%, fe:96.5 to 97.5 percent.
2. The titanium-nitrogen microalloyed HRB400E disc spiral as claimed in claim 1, wherein: comprises the following components in percentage by mass: c:0.22%, si:0.39%, mn:1.30%, P:0.035%, S:0.028%, ti:0.01%, N:0.0073%, fe:97 percent.
3. A production method of a titanium-nitrogen microalloyed HRB400E disc spiral is characterized by comprising the following steps:
the method comprises the following steps: the converter adopts high-pulling carbon, and the carbon content of the steel tapped at the end point is controlled;
step two: the silicon-aluminum-barium and silicon-calcium-barium composite deoxidizer is adopted for strong deoxidation, and a steel ladle is added during tapping;
step three: ferrosilicon, silicomanganese and a carburant are added when tapping is carried out for 1/4, and all alloys are added when tapping is carried out for 3/4;
step four: after tapping of the converter is finished, the molten steel tank enters an argon blowing station, titanium-nitrogen alloy is added in the argon blowing station by utilizing an alloy blanking barrel, and the titanium-nitrogen alloy is thrown into the bare molten steel of a steel ladle blown by argon;
step five: during casting, the continuous casting ladle and the tundish adopt long nozzle protective casting, the continuous casting adopts high-casting-speed alkaline protective slag, and a crystallizer is started for electromagnetic stirring;
step six: and (3) hot-feeding the billet into a heating furnace for heating, and then rolling and spinning to obtain a finished product.
4. The production method of the titanium-nitrogen microalloyed HRB400E disc spiral as claimed in claim 3, characterized in that: in the first step, the carbon content of the end-point tapping is controlled to be 0.05-0.18%.
5. The production method of the titanium-nitrogen microalloyed HRB400E disc snail as claimed in claim 4, characterized in that: in the second step, 0.15-0.35kg/t of silicon-aluminum-barium and 0.10-0.15kg/t of silicon-calcium-barium are prepared and added into a steel ladle when tapping is carried out by a converter.
6. The production method of the titanium-nitrogen microalloyed HRB400E disc snail as claimed in claim 5, characterized in that: and in the second step, before tapping, maintaining the tapping hole of the converter, and periodically replacing the tapping hole, and during tapping, tapping by adopting a slag stopping process, wherein the amount of slag is controlled to be below 50 mm.
7. The production method of the titanium-nitrogen microalloyed HRB400E disc spiral as claimed in claim 6, wherein: and in the fourth step, the molten steel tank enters an argon blowing station, the argon blowing pressure is increased, the molten steel on the liquid level of the molten steel is ensured to be exposed, titanium-nitrogen alloy is put into the exposed molten steel of the steel ladle blown open by the argon, the addition of the titanium-nitrogen alloy is added according to 1.0kg/t of steel, the soft argon blowing time is controlled to be more than or equal to 5min, the molten steel components are homogenized, and 5-8 packages of covering agent are added when the molten steel is discharged from the station.
8. The production method of the titanium-nitrogen microalloyed HRB400E disc spiral as claimed in claim 7, wherein: in the fourth step, the titanium-nitrogen alloy contains the following elements: ti:22.1%, si:22.4%, N:12.4%, rare earth: 5 percent.
9. The production method of the titanium-nitrogen microalloyed HRB400E disc spiral as claimed in claim 8, wherein: in the fifth step, the continuous casting tundish covering slag adopts alkaline covering slag, and the crystallizer covering slag adopts high-pulling-speed low-melting-point covering slag; electromagnetic stirring is started for the crystallizer, the current is 320A-350A, the frequency is 3-5Hz, and the water distribution of the crystallizer is 160m 3 H, the water quantity of the secondary cooling section is 40m 3 The temperature of the molten steel of the tundish is controlled to be 1515-1535 ℃; the casting blank pulling speed is controlled to be 4.2-4.5m/min。
10. The production method of the titanium-nitrogen microalloyed HRB400E disc spiral as claimed in claim 9, wherein: in the sixth step, when the billet is heated, the temperature of the soaking section is controlled to be 1110-1130 ℃, the rolling temperature is controlled to be 1010-1030 ℃, and the spinning temperature is controlled to be 930-1000 ℃.
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| CN202211231969.0A CN115652196A (en) | 2022-10-10 | 2022-10-10 | Titanium-nitrogen microalloyed HRB400E disc snail and production method thereof |
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