CN114395658A - Low-silicon hot coil Q195 molten steel castability control method - Google Patents
Low-silicon hot coil Q195 molten steel castability control method Download PDFInfo
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- CN114395658A CN114395658A CN202210206426.7A CN202210206426A CN114395658A CN 114395658 A CN114395658 A CN 114395658A CN 202210206426 A CN202210206426 A CN 202210206426A CN 114395658 A CN114395658 A CN 114395658A
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- molten steel
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- castability
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 56
- 239000010959 steel Substances 0.000 title claims abstract description 56
- 238000000034 method Methods 0.000 title claims abstract description 25
- 229910052710 silicon Inorganic materials 0.000 title claims abstract description 22
- 239000010703 silicon Substances 0.000 title claims abstract description 19
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 54
- 229910052786 argon Inorganic materials 0.000 claims abstract description 27
- 238000007664 blowing Methods 0.000 claims abstract description 22
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 19
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 19
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 13
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 13
- 239000001301 oxygen Substances 0.000 claims abstract description 13
- 230000002159 abnormal effect Effects 0.000 claims abstract description 12
- 238000010079 rubber tapping Methods 0.000 claims abstract description 11
- 239000002893 slag Substances 0.000 claims abstract description 11
- 230000008569 process Effects 0.000 claims abstract description 10
- 238000003723 Smelting Methods 0.000 claims abstract description 7
- 238000009749 continuous casting Methods 0.000 claims abstract description 7
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 6
- 230000033764 rhythmic process Effects 0.000 claims abstract description 6
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 6
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 5
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 5
- 239000000956 alloy Substances 0.000 claims abstract description 5
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims abstract description 4
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 4
- 229910000616 Ferromanganese Inorganic materials 0.000 claims abstract description 4
- 235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 4
- 238000005275 alloying Methods 0.000 claims abstract description 4
- 238000009529 body temperature measurement Methods 0.000 claims abstract description 4
- 239000011575 calcium Substances 0.000 claims abstract description 4
- 229910052791 calcium Inorganic materials 0.000 claims abstract description 4
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 4
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 claims abstract description 4
- 239000004571 lime Substances 0.000 claims abstract description 4
- 239000002562 thickening agent Substances 0.000 claims abstract description 4
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 3
- 239000011574 phosphorus Substances 0.000 claims abstract description 3
- 239000011593 sulfur Substances 0.000 claims abstract description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 21
- 229910052742 iron Inorganic materials 0.000 claims description 9
- 238000005266 casting Methods 0.000 claims description 3
- 230000002035 prolonged effect Effects 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 3
- 239000013589 supplement Substances 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 description 5
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 229910000519 Ferrosilicon Inorganic materials 0.000 description 1
- 229910000720 Silicomanganese Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- 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
- 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
- C21C7/064—Dephosphorising; Desulfurising
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention belongs to the technical field of steel smelting, and relates to a method for controlling the castability of molten steel of a low-silicon hot coil Q195, which comprises the following steps: 1) controlling the target end point of converter smelting: oxygen is less than or equal to 700ppm, phosphorus is less than or equal to 0.020 percent, and sulfur is less than or equal to 0.030 percent; according to the control condition of the end point of the converter, adding high-carbon ferromanganese and a carburant to adjust the components of molten steel during the tapping of the converter, carrying out deoxidation alloying by adopting aluminum, and forbidding adding silicon-containing alloy; 1.5-2 kg of slag thickening agent per ton of steel and 2.2-3.6 kg of refined lime per ton of steel are added in the tapping process, and the total amount of slag charge is more than or equal to 3.7kg per ton of steel; 2) the molten steel enters a CAS station for temperature measurement and oxygen determination, an aluminum wire is adopted to finely adjust the aluminum content in the components, and the addition amount of the aluminum wire is less than or equal to 200 m/furnace; the argon is blown at a large flow rate, namely the argon blowing flow rate of each furnace is more than or equal to 30Nm3/h、The argon blowing time is more than or equal to 3 min; adjusting the bottom blowing argon flow according to the molten steel components, the temperature and the furnace rhythm, not performing calcium treatment operation, and keeping the soft argon blowing time more than or equal to 5 min; 3) and (4) carrying out continuous casting. The invention adopts a strong deoxidation and calcium-free treatment process aiming at the low-silicon hot coil Q195 steel, and reduces the abnormal proportion of the castability of the molten steel.
Description
Technical Field
The invention belongs to the technical field of steel smelting, and relates to a method for controlling the castability of molten steel of a low-silicon hot coil Q195.
Background
The main production processes of the hot coil Q195 are BOF → CAS → CC and BOF → LF → CC. Because the production rhythm is accelerated, particularly the CAS argon blowing refining time of the BOF → CAS → CC production process is shortened from about 18min to about 13min, the CAS refining time cannot be ensured due to the rhythm lag, and the abnormal proportion of the castability of the molten steel is increased.
Disclosure of Invention
In view of the above, the present invention provides a method for controlling the castability of molten steel in a low silicon hot coil Q195, which aims to improve the castability of molten steel.
In order to achieve the purpose, the invention provides the following technical scheme:
a molten steel castability control method for a low-silicon hot coil Q195 comprises the following steps:
1) the converter molten iron is directly molten iron or desulfurized molten iron, and the target end point of converter smelting is controlled: oxygen is less than or equal to 700ppm, phosphorus is less than or equal to 0.020 percent, and sulfur is less than or equal to 0.030 percent;
according to the control condition of the end point of the converter, adding high-carbon ferromanganese and a carburant to adjust the components of molten steel during the tapping of the converter, carrying out deoxidation alloying by adopting aluminum, and forbidding adding silicon-containing alloy; 1.5-2 kg of slag thickening agent per ton of steel and 2.2-3.6 kg of refined lime per ton of steel are added in the tapping process, and the total amount of slag charge is more than or equal to 3.7kg per ton of steel;
2) the molten steel enters a CAS station for temperature measurement and oxygen determination, an aluminum wire is adopted to finely adjust the aluminum content in the components, and the addition amount of the aluminum wire is less than or equal to 200 m/furnace; the argon is blown at a large flow rate, namely the argon blowing flow rate of each furnace is more than or equal to 30Nm3H, the argon blowing time is more than or equal to 3 min; adjusting the flow of bottom blowing argon according to the components and temperature of molten steel and furnace rhythm; the calcium treatment operation is not carried out, and the soft argon blowing time is more than or equal to 5 min;
3) and (4) carrying out continuous casting, wherein the continuous casting process focuses on the castability condition of molten steel, abnormal information is fed back in time, and the number of single tundish furnaces is controlled according to the furnace number less than or equal to 18.
Further, the low-silicon hot coil Q195 steel comprises the following chemical components in percentage by weight: c: 0.04-0.10%, Si: less than or equal to 0.08 percent, Mn: 0.15-0.40%, P: less than or equal to 0.035%, S: less than or equal to 0.040%, Als: 0.010-0.045%, and the balance of Fe.
Further, the time from the CAS discharge of the molten steel to the start of casting is controlled to be 23 +/-2 min.
Further, abnormal conditions that the oxygen content at the end point of the converter is high, the slag is discharged during tapping or the CAS aluminum supplement amount is large occur, oxygen is determined before the CAS comes out of the station to confirm that molten steel deoxidization is good, the large-flow argon blowing or soft argon blowing time is prolonged for 3-5 min according to needs, and meanwhile, abnormal information is reported to the next procedure.
The invention has the beneficial effects that:
on the basis of the existing BOF → CAS → CC production process, the invention reduces the abnormal proportion of the castability of molten steel to 1% from about 5% before improvement by adopting a strong deoxidation and calcium-free treatment process aiming at the low-silicon hot coil Q195 steel, and basically avoids the castability accident.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention.
The method for controlling the castability of molten steel of a low-silicon hot coil Q195, provided by the embodiment, comprises the following chemical components in percentage by weight: c: less than or equal to 0.005%, Si: 0.45%, Mn: 0.15%, P: less than or equal to 0.020%, S: less than or equal to 0.010 percent, Als: less than or equal to 0.005 percent and the balance of Fe; the method comprises the following implementation steps:
1) the molten iron fed into the converter is directly fed with molten iron or desulfurized molten iron, and the iron-steel ratio is executed according to the synchronous large production.
2) The converter smelting adopts a conventional smelting process. The target end point O of the converter is less than or equal to 700ppm, P is less than or equal to 0.020 percent, and S is less than or equal to 0.030 percent. According to the control condition of the end point of the converter, adding high-carbon ferromanganese and carburant into steel tapping to adjust the components of molten steel, carrying out deoxidation alloying by adopting platform aluminum, and forbidding adding silicon-containing alloys such as ferrosilicon or silicomanganese alloy; 1.5-2 kg of slag thickening agent per ton of steel and 2.2-3.6 kg of refined lime per ton of steel are added in the tapping process, and the total amount of slag charge is more than or equal to 3.7kg per ton of steel.
2) The molten steel enters a CAS station for temperature measurement and oxygen determination, an aluminum wire is adopted to finely adjust the aluminum content in the components, and the addition amount of the aluminum wire is less than or equal to 200 m/furnace; the argon is blown at a large flow rate, namely the argon blowing flow rate of each furnace is more than or equal to 30Nm3H, the argon blowing time is more than or equal to 3 min; adjusting the bottom blowing argon flow according to the molten steel components, the temperature and the furnace rhythm, not performing calcium treatment operation, and keeping the soft argon blowing time more than or equal to 5 min;
the CAS time from the molten steel leaving station to the casting start is controlled according to 23 +/-2 min. When abnormal conditions such as high oxygen content at the end point of the converter, slag falling during tapping, large quantity of aluminum wires added by CAS (CAS system operation) and the like occur, oxygen is determined before the CAS is taken out of the station to confirm that molten steel is well deoxidized, the time for blowing argon or soft argon can be prolonged for 3-5 min, and meanwhile, abnormal information is reported to the next procedure.
3) And (4) carrying out continuous casting, wherein the number of the single tundish furnaces is controlled according to the furnace number less than or equal to 18. In the continuous casting process, the castability condition of molten steel is focused, and abnormal information is fed back in time.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.
Claims (4)
1. A molten steel castability control method for a low-silicon hot coil Q195 is characterized by comprising the following steps:
1) the converter molten iron is directly molten iron or desulfurized molten iron, and the target end point of converter smelting is controlled: oxygen is less than or equal to 700ppm, phosphorus is less than or equal to 0.020 percent, and sulfur is less than or equal to 0.030 percent;
according to the control condition of the end point of the converter, adding high-carbon ferromanganese and a carburant to adjust the components of molten steel during the tapping of the converter, carrying out deoxidation alloying by adopting aluminum, and forbidding adding silicon-containing alloy; 1.5-2 kg of slag thickening agent per ton of steel and 2.2-3.6 kg of refined lime per ton of steel are added in the tapping process, and the total amount of slag charge is more than or equal to 3.7kg per ton of steel;
2) the molten steel enters a CAS station for temperature measurement and oxygen determination, an aluminum wire is adopted to finely adjust the aluminum content in the components, and the addition amount of the aluminum wire is less than or equal to 200 m/furnace; the argon is blown at a large flow rate, namely the argon blowing flow rate of each furnace is more than or equal to 30Nm3H, the argon blowing time is more than or equal to 3 min; adjusting the flow of bottom blowing argon according to the components and temperature of molten steel and furnace rhythm; the calcium treatment operation is not carried out, and the soft argon blowing time is more than or equal to 5 min;
3) and (4) carrying out continuous casting, wherein the continuous casting process focuses on the castability condition of molten steel, abnormal information is fed back in time, and the number of single tundish furnaces is controlled according to the furnace number less than or equal to 18.
2. The method for controlling the castability of molten steel in a low-silicon hot coil Q195 as claimed in claim 1, wherein: the low-silicon hot-rolled Q195 steel comprises the following chemical components in percentage by weight: c: 0.04-0.10%, Si: less than or equal to 0.08 percent, Mn: 0.15-0.40%, P: less than or equal to 0.035%, S: less than or equal to 0.040%, Als: 0.010-0.045%, and the balance of Fe.
3. The method for controlling the castability of molten steel in a low-silicon hot coil Q195 as claimed in claim 1, wherein: and controlling the time from the molten steel CAS to the casting to be 23 +/-2 min.
4. The method for controlling the castability of molten steel in a low-silicon hot coil Q195 as claimed in claim 1, wherein: and when the abnormal conditions that the oxygen content at the end point of the converter is high, the slag is discharged during tapping or the CAS aluminum supplement amount is large occur, oxygen is determined before the CAS comes out of the station to confirm that the molten steel is well deoxidized, the large-flow argon blowing or soft argon blowing time is prolonged for 3-5 min according to the requirement, and meanwhile, the abnormal information is reported to the next procedure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210206426.7A CN114395658A (en) | 2022-03-02 | 2022-03-02 | Low-silicon hot coil Q195 molten steel castability control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210206426.7A CN114395658A (en) | 2022-03-02 | 2022-03-02 | Low-silicon hot coil Q195 molten steel castability control method |
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| Publication Number | Publication Date |
|---|---|
| CN114395658A true CN114395658A (en) | 2022-04-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210206426.7A Pending CN114395658A (en) | 2022-03-02 | 2022-03-02 | Low-silicon hot coil Q195 molten steel castability control method |
Country Status (1)
| Country | Link |
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| CN (1) | CN114395658A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115232920A (en) * | 2022-07-27 | 2022-10-25 | 日照钢铁控股集团有限公司 | Method for improving smelting purity of weathering steel |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102268513A (en) * | 2011-06-30 | 2011-12-07 | 攀钢集团有限公司 | Method for improving castability of molten steel of medium and low carbon steel |
| CN102962411A (en) * | 2012-11-20 | 2013-03-13 | 攀钢集团攀枝花钢钒有限公司 | Production method of low-carbon and medium-carbon steel |
| CN105385811A (en) * | 2015-11-27 | 2016-03-09 | 山东钢铁股份有限公司 | Production method for steel containing aluminum |
| CN106591708A (en) * | 2016-12-21 | 2017-04-26 | 山东钢铁股份有限公司 | Production method for producing low-carbon low-silicon and aluminum-containing steel through short process |
| CN110484681A (en) * | 2018-03-27 | 2019-11-22 | 上海梅山钢铁股份有限公司 | A kind of production method of low carbon low silicon aluminium killed steel water |
| CN111440981A (en) * | 2018-01-31 | 2020-07-24 | 日照钢铁控股集团有限公司 | Low-carbon silicon-aluminum-control killed clean steel process |
| CN112961960A (en) * | 2021-02-03 | 2021-06-15 | 重庆钢铁股份有限公司 | Technological method for improving abnormal condition of tapping slag |
-
2022
- 2022-03-02 CN CN202210206426.7A patent/CN114395658A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102268513A (en) * | 2011-06-30 | 2011-12-07 | 攀钢集团有限公司 | Method for improving castability of molten steel of medium and low carbon steel |
| CN102962411A (en) * | 2012-11-20 | 2013-03-13 | 攀钢集团攀枝花钢钒有限公司 | Production method of low-carbon and medium-carbon steel |
| CN105385811A (en) * | 2015-11-27 | 2016-03-09 | 山东钢铁股份有限公司 | Production method for steel containing aluminum |
| CN106591708A (en) * | 2016-12-21 | 2017-04-26 | 山东钢铁股份有限公司 | Production method for producing low-carbon low-silicon and aluminum-containing steel through short process |
| CN111440981A (en) * | 2018-01-31 | 2020-07-24 | 日照钢铁控股集团有限公司 | Low-carbon silicon-aluminum-control killed clean steel process |
| CN110484681A (en) * | 2018-03-27 | 2019-11-22 | 上海梅山钢铁股份有限公司 | A kind of production method of low carbon low silicon aluminium killed steel water |
| CN112961960A (en) * | 2021-02-03 | 2021-06-15 | 重庆钢铁股份有限公司 | Technological method for improving abnormal condition of tapping slag |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115232920A (en) * | 2022-07-27 | 2022-10-25 | 日照钢铁控股集团有限公司 | Method for improving smelting purity of weathering steel |
| CN115232920B (en) * | 2022-07-27 | 2023-11-03 | 日照钢铁控股集团有限公司 | Method for improving smelting purity of weathering steel |
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Application publication date: 20220426 |