CN111254340A - Smelting method of ultra-low silicon high titanium aluminum-containing welding wire steel - Google Patents
Smelting method of ultra-low silicon high titanium aluminum-containing welding wire steel Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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- 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
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- 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
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- 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
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- 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
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- 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
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- C21C7/072—Treatment with gases
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- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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Abstract
The invention relates to a method for smelting ultra-low-silicon high-titanium aluminum-containing welding wire steel, which comprises the following process routes of molten iron pretreatment, converter, LF furnace treatment and bloom production, wherein the C value of converter tapping is controlled to be 0.03-0.045%, and in the process of converter tapping, deoxidation alloy is added during the period that the tapping amount reaches 1/3-2/3, Al series deoxidation alloy is added firstly, and Ti series deoxidation alloy is added; when the molten steel tank does not have a special low-silicon steel tank, the molten steel tank is rinsed by double slag lines; the alkalinity of top slag of the LF furnace which adopts light modification is controlled to be 2.0-2.8, the argon pressure is controlled to be 0.2-0.5MPa, the wire feeding processing time of the LF furnace is controlled to be 30-35 minutes, Al and Ti adjustment operations are not carried out within 5 minutes at the final stage of refining processing, the requirement of refining on-machine S is not more than 0.012 percent, iron and calcium wires are fed to molten steel at the final stage, the whole-process protection casting is adopted in the continuous casting process, and white gray particles are adopted for covering and protecting the tundish. The invention greatly improves the yield of the ultra-low silicon high titanium aluminum-containing steel from the original 65 percent to the current 89 percent, has obvious effect and reduces the cost loss of steel modification or cold recovery.
Description
Technical Field
The invention relates to the field of ferrous metallurgy, in particular to a method for smelting ultra-low-silicon high-titanium aluminum-containing welding wire steel.
Background
With social progress and high-precision requirements, the requirements of next users of steel production enterprises on the quality of steel are continuously improved, the grade of steel plates is gradually improved in recent years, the grade of required welding wires is also improved, the requirements on the components of the welding wire steel are extremely strict, and once exceeding standard indicates that the steel is degraded or scrapped, the quality loss of steel factories is large.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method for smelting an ultra-low silicon high titanium aluminum-containing welding wire steel, wherein the ultra-low silicon high titanium aluminum-containing welding wire steel contains less than or equal to 0.07 percent of C, less than or equal to 0.03 percent of Si, 0.05-0.10 percent of Ti, 0.02-0.055 percent of Al and less than or equal to 0.015 percent of S, so that the precise control of the silicon component is realized, and the continuous casting of 12-15 tanks by molten steel is realized.
In order to achieve the purpose, the invention adopts the following technical scheme:
a smelting method of ultra-low silicon high titanium aluminum-containing welding wire steel comprises the following steps of molten iron pretreatment, converter, LF furnace treatment and bloom production, and specifically comprises the following steps:
1) the molten iron has the following composition requirements: if S is more than 0.015 percent, S removal treatment is required;
2) and (3) converter smelting control: the C value of converter tapping is controlled to be 0.03-0.045%, the tapping temperature is controlled to be 1640-1670 ℃, the terminal lance position is controlled to be 1.1-1.2m, the time is controlled to be more than 25 seconds, and the terminal oxygen value of molten steel is controlled to be within 700 ppm;
3) alloying control: in the converter tapping process, adding a deoxidation alloy when the tapping quantity reaches 1/3-2/3, adding Al series deoxidation alloy firstly, and then adding Ti series deoxidation alloy;
4) a slag blocking mode: in the front slag blocking mode and the rear slag blocking mode, if a slag blocking cone or a slag blocking car has a fault, steel retaining operation is adopted, and the slag carrying amount of the converter is controlled within 0.2 t;
5) rinsing the cans: when the molten steel tank is not provided with a special low silicon steel tank, casting the steel grade with the secondary yield of less than or equal to 0.10 percent ahead of time by 1, rinsing the molten steel tank by adopting a double slag line, casting the steel grade with the secondary yield of less than or equal to 0.10 percent at the 1 st casting, controlling the loading amount according to 1.12-1.16 times of the tapping amount of the converter, and controlling the loading amount of the ultra-low silicon high titanium aluminum-containing welding wire steel according to 1.07-1.10 times of the tapping amount of the converter;
6) controlling first sample components in an LF furnace: c is less than or equal to 0.05 percent, Si is less than or equal to 0.015 percent, Als is controlled to be 0.060 to 0.080 percent, and Ti is controlled to be 0.080 to 0.11 percent;
7) controlling LF furnace top slag: the LF furnace is controlled in a light modification mode, the alkalinity of top slag is controlled to be 2.0-2.8, the argon pressure is controlled to be 0.2-0.5MPa, and furnace cover lowering operation is adopted in the stirring process;
8) and (3) wire feeding treatment of an LF (ladle furnace): the treatment time is controlled to be 30-35 minutes, the Al and Ti regulation operation is not carried out within 5 minutes at the last stage of the refining treatment, the S requirement of the refining machine is not more than 0.012 percent, the iron calcium wire is fed into the molten steel at the last stage, the wire feeding quantity is controlled to be 100-200 meters when the S is not more than 0.005 percent, the wire feeding quantity is controlled to be 200-300 meters when the S is not more than 0.010 percent and is not more than 0.012 percent, the wire feeding quantity is 300-400 meters when the S is not more than 0.010 percent and is not more than 0.012 percent, the molten steel is weakly blown with argon after wire feeding, the argon blowing time is controlled to be 3-5 minutes, and the argon;
9) casting in front of the machine: the temperature of the machine is 1600-1610 ℃, the whole process of protective casting is adopted in the continuous casting process, the tundish is covered and protected by white ash particles, the gap between the cover of the tundish is sealed by asbestos, the superheat degree of casting is controlled at 20-30 ℃, and the pulling speed is controlled at 0.7-0.75 m/min.
Compared with the prior art, the invention has the beneficial effects that:
the invention greatly improves the yield of the ultra-low silicon high titanium aluminum-containing steel from the original 65 percent to the current 89 percent, has obvious effect and reduces the cost loss of steel modification or cold recovery.
Detailed Description
The invention is further illustrated by the following examples:
the following examples describe the invention in detail. These examples are merely illustrative of the best embodiments of the present invention and do not limit the scope of the invention.
A smelting method of ultra-low silicon high titanium aluminum-containing welding wire steel comprises the following steps of molten iron pretreatment, converter, LF furnace treatment and bloom production, and specifically comprises the following steps:
1) the molten iron has the following composition requirements: if S is more than 0.015 percent, S removal treatment is required;
2) and (3) converter smelting control: the C value of converter tapping is controlled to be 0.03-0.045%, the tapping temperature is controlled to be 1640-1670 ℃, the terminal lance position is controlled to be 1.1-1.2m, the time is controlled to be more than 25 seconds, and the terminal oxygen value of molten steel is controlled to be within 700 ppm;
3) alloying control: in the converter tapping process, adding a deoxidation alloy when the tapping quantity reaches 1/3-2/3, adding Al series deoxidation alloy firstly, and then adding Ti series deoxidation alloy;
4) a slag blocking mode: in the front slag blocking mode and the rear slag blocking mode, if a slag blocking cone or a slag blocking car has a fault, steel retaining operation is adopted, and the slag carrying amount of the converter is controlled within 0.2 t;
5) rinsing the cans: when the molten steel tank is not provided with a special low silicon steel tank, casting the steel grade with the secondary yield of less than or equal to 0.10 percent ahead of time by 1, rinsing the molten steel tank by adopting a double slag line, casting the steel grade with the secondary yield of less than or equal to 0.10 percent at the 1 st casting, controlling the loading amount according to 1.12-1.16 times of the tapping amount of the converter, and controlling the loading amount of the ultra-low silicon high titanium aluminum-containing welding wire steel according to 1.07-1.10 times of the tapping amount of the converter;
6) controlling first sample components in an LF furnace: c is less than or equal to 0.05 percent, Si is less than or equal to 0.015 percent, Als is controlled to be 0.060 to 0.080 percent, and Ti is controlled to be 0.080 to 0.11 percent;
7) controlling LF furnace top slag: the LF furnace is controlled in a light modification mode, the alkalinity of top slag is controlled to be 2.0-2.8, the argon pressure is controlled to be 0.2-0.5MPa, and furnace cover lowering operation is adopted in the stirring process;
8) and (3) wire feeding treatment of an LF (ladle furnace): the treatment time is controlled to be 30-35 minutes, the Al and Ti regulation operation is not carried out within 5 minutes at the last stage of the refining treatment, the S requirement of the refining machine is not more than 0.012 percent, the iron calcium wire is fed into the molten steel at the last stage, the wire feeding quantity is controlled to be 100-200 meters when the S is not more than 0.005 percent, the wire feeding quantity is controlled to be 200-300 meters when the S is not more than 0.010 percent and is not more than 0.012 percent, the wire feeding quantity is 300-400 meters when the S is not more than 0.010 percent and is not more than 0.012 percent, the molten steel is weakly blown with argon after wire feeding, the argon blowing time is controlled to be 3-5 minutes, and the argon;
9) casting in front of the machine: the temperature of the machine is 1600-1610 ℃, the whole process of protective casting is adopted in the continuous casting process, the tundish is covered and protected by white ash particles, the gap between the cover of the tundish is sealed by asbestos, the superheat degree of casting is controlled at 20-30 ℃, and the pulling speed is controlled at 0.7-0.75 m/min.
Example 1
A smelting method of ultra-low silicon high titanium aluminum-containing welding wire steel comprises the following steps of molten iron pretreatment, a 90t converter, LF furnace treatment and bloom production, and specifically comprises the following steps:
1) removing S from molten iron, wherein the S removal target is 0.005%;
2) and (3) converter smelting control:
the ratio of the converter molten iron to the scrap steel is 9: 2, the converter scrap mainly adopts light thin materials, the C value of the converter tapping is controlled to be 0.04%, the tapping temperature is controlled to be 1650 ℃, the end point gun position is controlled to be 1.1m, the time is controlled to be 30S, and the end point oxygen value of the molten steel is 590 ppm.
3) Alloying control: the converter adopts an alloy mode that Al series deoxidation alloy is firstly added, Ti series alloy is finally added, and the adding time of the alloy is controlled to be added in the 1/3 period of molten steel.
4) A slag blocking mode: the slag carrying amount of the converter is 0.18t by adopting a front slag blocking mode and a rear slag blocking mode.
5) Rinsing the cans:
the molten steel tank is not provided with a low silicon steel special tank, and the tank rinsing treatment is carried out before production. The steel grade with the yield Si less than or equal to 0.10% is required to be cast 1 in advance, the steel ladle adopts a double slag line to rinse the ladle, the yield Si of the cast 1 is less than or equal to 0.10%, the loading amount is controlled according to 112t, and the loading amount of the steel grade is controlled according to 107 t.
6) The requirements of the molten steel tank are as follows:
the large tank edge is hooked before production, the influence of tank edge iron on the Si content in molten steel is reduced, molten steel slagging-off treatment is required to be adopted before 6 tanks are automatically returned before casting, the slagging-off standard is that the molten steel surface is exposed by more than 85 percent, and the slagging-off time is 3-4 minutes
7) Controlling first sample components in an LF furnace:
the content of C is 0.045%, the content of Si is 0.015%, the content of Al is 0.065%, and the content of Ti is 0.088%.
8) Controlling LF furnace top slag:
the LF furnace is controlled in a light modification mode, the alkalinity of top slag is controlled to be 2.5, and the top slag effect is optimal. Stirring weakly with small amount of argon under 0.3-0.4 MPa. And the stirring process adopts furnace cover lowering operation to reduce the contact with the outside gas.
9) And (3) wire feeding treatment of an LF (ladle furnace):
the processing time is controlled to be 35 minutes (including wire feeding and weak blowing pressure), Al and Ti adjustment operations are not carried out within 8 minutes at the last stage of refining processing, the S content on a refining machine is 0.010 percent, and the wire feeding amount is 350 meters. And weakly blowing argon into the molten steel after wire feeding, wherein the argon blowing time is controlled to be 4 minutes, and the argon blowing pressure is 0.2-0.3 MPa.
10 casting before machine:
the temperature of the machine is 1603 ℃, and the continuous casting process of the square billet with the section of 280 mm × 380mm adopts whole-process protective casting; the tundish is covered and protected by lime granules; asbestos is adopted to seal gaps of the cover of the tundish; the superheat degree of the casting is controlled at 23 ℃, the drawing speed is controlled at 0.7m/min, the qualified components of the molten steel can be realized, and the number of continuous casting tanks reaches more than 12.
Example 2
A smelting method of ultra-low silicon high titanium aluminum-containing welding wire steel comprises the following steps of molten iron pretreatment, a 90t converter, LF furnace treatment and bloom production, and specifically comprises the following steps:
1) removing S from molten iron, wherein the S removal target is 0.005%;
2) and (3) converter smelting control:
the ratio of the converter molten iron to the scrap steel is 9: 3, the converter scrap steel mainly adopts light thin materials, the C value of the converter tapping is controlled to be 0.045%, the tapping temperature is 1645 ℃, the end point gun position is controlled to be 1.15m, the time is controlled to be 40s, and the end point oxygen value of the molten steel is 520 ppm.
3) Alloying control: the converter adopts an alloy mode that Al series deoxidation alloy is firstly added, Ti series alloy is finally added, and the adding time of the alloy is controlled to be added in the 1/3 period of molten steel.
4) A slag blocking mode: the front slag blocking mode and the rear slag blocking mode control the slag quantity of the converter to be 0.2 t.
5) Rinsing the cans:
the molten steel tank is not provided with a low silicon steel special tank, and the tank rinsing treatment is carried out before production. The steel grade with the yield Si less than or equal to 0.10% is required to be poured for the second time in advance by 1, the steel grade with the yield Si less than or equal to 0.10% is adopted for the molten steel tank, the steel grade with the yield Si less than or equal to 0.10% is poured for the first time in the molten steel tank, the loading amount is controlled according to 116t, and the loading amount of the steel grade is controlled according to 110 t.
6) The requirements of the molten steel tank are as follows:
the large tank edge is hooked before production, the influence of tank edge iron on the content of Si in molten steel is reduced, molten steel slag skimming is required to be adopted when 6 tanks are not returned automatically before casting, the slag skimming standard is that the molten steel surface is exposed by more than 85%, but the slag skimming time is required to be 2-3 minutes.
7) Controlling first sample components in an LF furnace:
the content of C is 0.050%, the content of Si is 0.012%, the content of Als is 0.072%, and the content of Ti is controlled at 0.105%.
8) Controlling LF furnace top slag:
the LF furnace is controlled in a light modification mode, the alkalinity of top slag is controlled to be 2.8, and the top slag effect is optimal. Stirring weakly with small amount of argon under 0.2-0.4 MPa. And the stirring process adopts furnace cover lowering operation to reduce the contact with the outside gas.
9) And (3) wire feeding treatment of an LF (ladle furnace):
the processing time is controlled to be 30 minutes (including wire feeding and weak pressure blowing), Al and Ti adjustment operations are not carried out within 5 minutes at the last stage of refining processing, the S content on a refining machine is 0.012 percent, and the wire feeding amount is 400 meters. And weakly blowing argon into the molten steel after wire feeding, wherein the argon blowing time is controlled to be 5 minutes, and the argon blowing pressure is 0.2-0.3 MPa.
10 casting before machine:
the temperature of the machine is 1608 ℃, and the continuous casting process of the square billet with the section of 280 multiplied by 380mm adopts the whole protective casting; the tundish is covered and protected by lime granules; asbestos is adopted to seal gaps of the cover of the tundish; the superheat degree of casting is controlled at 28 ℃, the drawing speed is controlled at 0.75m/min, the qualified molten steel components can be realized, and the number of continuous casting tanks reaches more than 12.
Example 3
A smelting method of ultra-low silicon high titanium aluminum-containing welding wire steel comprises the following steps of molten iron pretreatment, a 90t converter, LF furnace treatment and bloom production, and specifically comprises the following steps:
1) removing S from molten iron, wherein the S removal target is 0.005%;
2) and (3) converter smelting control:
the ratio of the converter molten iron to the scrap steel is 9: 2.5 the converter scrap mainly adopts light thin materials, the converter tapping C value is controlled at 0.038%, the tapping temperature is 1658 ℃, the terminal lance position is controlled at 1.2m, the control time is 35s, and the terminal oxygen value of the molten steel is 585 ppm.
3) Alloying control: the converter adopts an alloy mode that Al series deoxidation alloy is firstly added, Ti series alloy is finally added, and the adding time of the alloy is controlled to be added in the 1/3 period of molten steel.
4) A slag blocking mode: the front slag blocking mode and the rear slag blocking mode control the slag carrying amount of the converter to be 0.15 t.
5) Rinsing the cans:
the molten steel tank is not provided with a low silicon steel special tank, and the tank needs to be rinsed before production. The steel grade with the yield Si less than or equal to 0.10% is required to be poured 1 in advance, the steel ladle adopts a double slag line to rinse the ladle, the yield Si of the finished product Si of the casting 1 is less than or equal to 0.10%, the loading amount is controlled according to 114t, and the loading amount of the steel grade is controlled according to 109 t.
6) The requirements of the molten steel tank are as follows:
the large tank edge is hooked before production, the influence of tank edge iron on the content of Si in molten steel is reduced, molten steel slag skimming is required to be adopted when 6 tanks are not returned automatically before casting, the slag skimming standard is that the molten steel surface is exposed by more than 85%, but the slag skimming time is required to be 2-3 minutes.
7) Controlling first sample components in an LF furnace:
the content of C is 0.043%, the content of Si is 0.010%, the content of Als is 0.068%, and the content of Ti is controlled at 0.095%.
8) Controlling LF furnace top slag:
the LF furnace is controlled in a light modification mode, the alkalinity of top slag is controlled to be 2.0, and the top slag effect is optimal. Stirring weakly with small amount of argon under 0.3-0.4 MPa. And the stirring process adopts furnace cover lowering operation to reduce the contact with the outside gas.
9) And (3) wire feeding treatment of an LF (ladle furnace):
the treatment time is controlled at 32 minutes (including wire feeding and weak pressure blowing), Al and Ti adjustment operations are not carried out within 6 minutes at the last stage of refining treatment, the S content of the refining machine is 0.009%, and the wire feeding amount is 280 m. And weakly blowing argon into the molten steel after wire feeding, wherein the argon blowing time is controlled to be 4 minutes, and the argon blowing pressure is 0.2-0.3 MPa.
10 casting before machine:
the temperature of the machine is 1610 ℃, and the whole protective casting process is adopted in the continuous casting process of 280 multiplied by 380mm of the section of the square billet; the tundish is covered and protected by lime granules; asbestos is adopted to seal gaps of the cover of the tundish; the superheat degree of casting is controlled at 30 ℃, the drawing speed is controlled at 0.7m/min, the qualified molten steel components can be realized, and the number of continuous casting tanks reaches more than 12.
The invention greatly improves the yield of the ultra-low silicon high titanium aluminum-containing steel from the original 65 percent to the current 89 percent, has obvious effect and reduces the cost loss of steel modification or cold recovery.
The foregoing is only illustrative of the principles of the invention, and all equivalent changes and modifications can be made herein without departing from the spirit and scope of the invention.
Claims (1)
1. A smelting method of ultra-low silicon high titanium aluminum-containing welding wire steel comprises the following process routes of molten iron pretreatment, converter, LF furnace treatment and bloom production, and is characterized by comprising the following specific steps:
1) the molten iron has the following composition requirements: if S is more than 0.015 percent, S removal treatment is required;
2) and (3) converter smelting control: the C value of converter tapping is controlled to be 0.03-0.045%, the tapping temperature is controlled to be 1640-1670 ℃, the terminal lance position is controlled to be 1.1-1.2m, the time is controlled to be more than 25 seconds, and the terminal oxygen value of molten steel is controlled to be within 700 ppm;
3) alloying control: in the converter tapping process, adding a deoxidation alloy when the tapping quantity reaches 1/3-2/3, adding Al series deoxidation alloy firstly, and then adding Ti series deoxidation alloy;
4) a slag blocking mode: in the front slag blocking mode and the rear slag blocking mode, if a slag blocking cone or a slag blocking car has a fault, steel retaining operation is adopted, and the slag carrying amount of the converter is controlled within 0.2 t;
5) rinsing the cans: when the molten steel tank is not provided with a special low silicon steel tank, casting the steel grade with the secondary yield of less than or equal to 0.10 percent ahead of time by 1, rinsing the molten steel tank by adopting a double slag line, casting the steel grade with the secondary yield of less than or equal to 0.10 percent at the 1 st casting, controlling the loading amount according to 1.12-1.16 times of the tapping amount of the converter, and controlling the loading amount of the ultra-low silicon high titanium aluminum-containing welding wire steel according to 1.07-1.10 times of the tapping amount of the converter;
6) controlling first sample components in an LF furnace: c is less than or equal to 0.05 percent, Si is less than or equal to 0.015 percent, Als is controlled to be 0.060 to 0.080 percent, and Ti is controlled to be 0.080 to 0.11 percent;
7) controlling LF furnace top slag: the LF furnace is controlled in a light modification mode, the alkalinity of top slag is controlled to be 2.0-2.8, the argon pressure is controlled to be 0.2-0.5MPa, and furnace cover lowering operation is adopted in the stirring process;
8) and (3) wire feeding treatment of an LF (ladle furnace): the treatment time is controlled to be 30-35 minutes, the Al and Ti regulation operation is not carried out within 5 minutes at the last stage of the refining treatment, the S requirement of the refining machine is not more than 0.012 percent, the iron calcium wire is fed into the molten steel at the last stage, the wire feeding quantity is controlled to be 100-200 meters when the S is not more than 0.005 percent, the wire feeding quantity is controlled to be 200-300 meters when the S is not more than 0.010 percent and is not more than 0.012 percent, the wire feeding quantity is 300-400 meters when the S is not more than 0.010 percent and is not more than 0.012 percent, the molten steel is weakly blown with argon after wire feeding, the argon blowing time is controlled to be 3-5 minutes, and the argon;
9) casting in front of the machine: the temperature of the machine is 1600-1610 ℃, the whole process of protective casting is adopted in the continuous casting process, the tundish is covered and protected by white ash particles, the gap between the cover of the tundish is sealed by asbestos, the superheat degree of casting is controlled at 20-30 ℃, and the pulling speed is controlled at 0.7-0.75 m/min.
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| CN114350894A (en) * | 2022-01-07 | 2022-04-15 | 鞍钢股份有限公司 | Precise titanium adjusting method for refining treatment of high-titanium wear-resistant steel in single LF furnace |
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