CN113293333A - Production method of weather-resistant angle steel billet - Google Patents
Production method of weather-resistant angle steel billet Download PDFInfo
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- CN113293333A CN113293333A CN202110557416.3A CN202110557416A CN113293333A CN 113293333 A CN113293333 A CN 113293333A CN 202110557416 A CN202110557416 A CN 202110557416A CN 113293333 A CN113293333 A CN 113293333A
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- slag
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 35
- 239000010959 steel Substances 0.000 title claims abstract description 35
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 18
- 238000007670 refining Methods 0.000 claims abstract description 19
- 238000000034 method Methods 0.000 claims abstract description 15
- 238000009749 continuous casting Methods 0.000 claims abstract description 13
- 238000001816 cooling Methods 0.000 claims abstract description 6
- 238000003723 Smelting Methods 0.000 claims abstract description 5
- 238000005266 casting Methods 0.000 claims abstract description 5
- 238000004886 process control Methods 0.000 claims abstract description 3
- 239000002893 slag Substances 0.000 claims description 18
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 16
- 238000007664 blowing Methods 0.000 claims description 12
- 229910052786 argon Inorganic materials 0.000 claims description 8
- 229910052698 phosphorus Inorganic materials 0.000 claims description 8
- 239000011574 phosphorus Substances 0.000 claims description 8
- 229910000519 Ferrosilicon Inorganic materials 0.000 claims description 7
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 7
- 238000010079 rubber tapping Methods 0.000 claims description 7
- 229910052782 aluminium Inorganic materials 0.000 claims description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 5
- 239000000843 powder Substances 0.000 claims description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 4
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 4
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 4
- 229910052799 carbon Inorganic materials 0.000 claims description 3
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- 230000000694 effects Effects 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 3
- 229910052717 sulfur Inorganic materials 0.000 claims description 3
- 239000011593 sulfur Substances 0.000 claims description 3
- 229910000975 Carbon steel Inorganic materials 0.000 claims description 2
- 229910000604 Ferrochrome Inorganic materials 0.000 claims description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 2
- 239000010962 carbon steel Substances 0.000 claims description 2
- 238000010924 continuous production Methods 0.000 claims description 2
- 229910052742 iron Inorganic materials 0.000 claims description 2
- 229910052751 metal Inorganic materials 0.000 claims description 2
- 239000002184 metal Substances 0.000 claims description 2
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims 1
- 230000000903 blocking effect Effects 0.000 claims 1
- 229910052748 manganese Inorganic materials 0.000 claims 1
- 239000011572 manganese Substances 0.000 claims 1
- 238000005275 alloying Methods 0.000 abstract description 2
- 230000007797 corrosion Effects 0.000 abstract description 2
- 238000005260 corrosion Methods 0.000 abstract description 2
- 230000007547 defect Effects 0.000 abstract description 2
- 238000003860 storage Methods 0.000 abstract description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 5
- 229910052760 oxygen Inorganic materials 0.000 description 5
- 239000001301 oxygen Substances 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 4
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 2
- 235000011941 Tilia x europaea Nutrition 0.000 description 2
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 2
- 239000010436 fluorite Substances 0.000 description 2
- 239000004571 lime Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008520 organization Effects 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000012840 feeding operation Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000010903 husk Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
- C22C33/06—Making ferrous alloys by melting using master alloys
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/111—Treating the molten metal by using protecting powders
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/18—Controlling or regulating processes or operations for pouring
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/22—Controlling or regulating processes or operations for cooling cast stock or mould
-
- 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
- C21C7/0006—Adding metallic additives
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
-
- C—CHEMISTRY; METALLURGY
- 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
- C21C2007/0093—Duplex process; Two stage processes
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
A production method of weather-resistant angle steel billets comprises converter process control, LF refining furnace smelting, continuous casting control and billet cooling, wherein in the production process, the aspects of a deoxidation system, a slagging system, alloying, a continuous casting process, billet storage and the like are greatly adjusted, and the aims of finally ensuring that the corrosion resistance index I is more than 6.5, P is less than or equal to 0.015, S is less than or equal to 0.010 and the control of various defects of casting billets is less than or equal to 2.5 levels are finally ensured.
Description
Technical Field
The invention belongs to the field of steel making, and relates to a production method of weather-resistant angle steel billets.
Background
The prior art adopts the conventional process for production, adopts a converter single slag method, has lower end point control requirement, adopts the conventional deoxidation process, does not adopt aluminum deoxidation and has high production efficiency.
Disclosure of Invention
The technical scheme of the invention comprises the following steps:
1. and (3) converter process control:
1.1 charging steel materials: and (3) strictly executing a fine material policy, wherein the sulfur content of the molten iron cannot exceed 0.035%, and the phosphorus content cannot exceed 0.130%.
1.2 the converter tapping uses a slag stopping cone to stop slag, the phosphorus return amount of the converter tapping is controlled within 0.003 percent, and argon is used for the converter bottom blowing and the ladle bottom blowing.
1.3 converter end point control: [C] less than or equal to 0.05 percent, less than or equal to 0.006 percent of [ P ], and less than or equal to 1660 ℃.
Smelting in LF refining furnace
And in the refining process, ferrosilicon powder and aluminum particles are deoxidized, a small amount of silicon carbide is used for ensuring the submerged arc effect, the white slag is refined for more than 15min, materials such as ferrosilicon, metal manganese, low-carbon ferrochrome and the like are used for finely adjusting the components, and steel is tapped after the chemical components and the temperature are proper.
And carrying out soft argon blowing after refining and tapping, strictly keeping the molten steel from being exposed, and ensuring that the soft argon blowing time is not less than 15 min.
3. Continuous casting control
3.1 the continuous casting speed fluctuation is less than +/-0.1 m/min, a stopper rod bag is used as a tundish, and full-protection pouring measures are adopted.
3.2 when the nozzle is sleeved with the hole, the pouring is started after the flow is blocked, the lower connecting piece of the crystallizer and the nozzle are burnt, and the pouring is stopped and the ladle is replaced if the pulling speed is unchanged and the pouring still cannot be carried out. If the condition of continuous production after ladle replacement is not met, molten steel is organized to be subjected to remelting treatment.
3.3 the micro-carbon steel covering slag is used for continuous casting, the Al-Ca covering agent is used in the middle package, and the carbonized rice husk is not used.
4. Cooling of steel billet
After the production of the steel billets is finished, the steel billets are stacked in a cargo space for not less than 36 hours, and hot billets are stored around the steel billets to realize the stacking cooling of the steel billets.
The invention has the advantages that: the invention relates to a production method for smelting low-carbon, low-phosphorus, low-sulfur and high-alloy steel, which greatly adjusts the aspects of deoxidation system, slagging system, alloying, continuous casting process, billet storage and the like in the production process in order to ensure that the chemical components of molten steel are qualified and the quality of billets are qualified, and finally ensures the aims of corrosion resistance index I being more than 6.5, P being less than or equal to 0.015, S being less than or equal to 0.010 and the control of various defects of casting billets being less than or equal to 2.5 grade.
Description of the drawings:
FIG. 1 is a schematic process flow diagram of the present invention.
The specific implementation mode is as follows:
1. converter endpoint control
Controlling the early-stage heating speed, and fully utilizing the early-stage low-temperature condition for dephosphorization; in the middle stage of converting, excessive drying of the slag is prevented, and phosphorus in the slag is prevented from returning to molten steel again; early slagging is required in the later stage of blowing, and even slight slag overflow can be realized in 8-10min if steel grades with phosphorus content lower than 0.010% are produced, so as to prevent the phosphorus return of high-temperature molten steel in the later stage. In the whole blowing process, the temperature of a molten pool must be controlled, the first-time temperature is preferably controlled to be 1580 ℃ of 1550-.
Smelting in LF refining furnace
2.1 refining furnace production organization
In order to ensure subsequent continuous casting, two furnaces are adopted for refining in turn, and the second furnace of the converter is used as the first furnace of the tundish for organizing production. When the second furnace is used as a first furnace of a tundish for pouring in continuous casting, the first furnace finishes component fine adjustment and temperature raising work in a refining furnace and carries out wire feeding operation. This can be controlled as a node of a subsequent production organization.
2.2 slagging and slag Regulation operations
The first power transmission of the refining furnace is to add required lime into a ladle, the average amount of the added lime is 1005kg, about 500kg of fluorite is added in the early stage, and the proper fluorite addition amount is selected according to the viscosity degree of slag.
A small amount of silicon carbide is added to carry out arc protection operation in the early stage of power transmission, the using amount of the silicon carbide is about 10kg, 60kg of ferrosilicon powder and 20kg of aluminum particles are added within 10min before power transmission to carry out slag adjustment operation, the ferrosilicon powder and the aluminum particles are mixed together, 1/4 shovels are added each time, and the most possible scattering is carried out on the slag surface.
About 40kg of ferrosilicon powder and 10kg of aluminum particles are used for slag adjustment in the second power transmission process, and the adding mode is the same as the above.
2.3 control of oxygen, Nitrogen content
1466 furnace refining for 19min, and oxygen determination result is 3.1ppm, at which time the molten steel temperature is 1618 deg.C. The temperature of the molten steel was increased to 1650 ℃ by continuing the power supply, and oxygen was again determined to verify the effect of deoxidation, and the result was 4.0 ppm. The 1467 furnace was fed with electricity for 22min, and then oxygen determination was carried out, whereby the oxygen determination result was 3.7 ppm.
In order to control the nitrogen increasing amount in the refining process, two modes of reducing the dedusting operation parameters of the refining furnace and reducing the furnace cover are mainly adopted, and the nitrogen increasing amount in the refining process is 0.0015%.
3. Continuous casting and finishing
The stopper rod is used for automatically controlling the flow, the liquid level of the crystallizer is stable, the pulling speed is stabilized at 1.7-1.8m/min during the pouring, the tundish temperature is 1550-.
According to the technological system, the steel billet needs to be slowly cooled for 36 hours, and the steel billet is completely surrounded, pressed and piled for cooling.
The invention has been described in an illustrative manner, and it is to be understood that the invention is not limited to the precise form disclosed, and that various insubstantial modifications of the inventive concepts and solutions, or their direct application to other applications without such modifications, are intended to be covered by the scope of the invention.
Claims (4)
1. The production method of the weather-resistant angle steel billet is characterized by comprising the following steps of: the method comprises the following steps:
and (3) converter process control: the method comprises the following steps of strictly executing a fine material policy on the steel material entering the furnace, wherein the sulfur content of the molten iron cannot exceed 0.035%, and the phosphorus content cannot exceed 0.130%; slag is blocked by using a slag blocking cone during converter tapping, the phosphorus return amount of the converter tapping is controlled within 0.003 percent, and argon is used for converter bottom blowing and ladle bottom blowing;
smelting in an LF refining furnace: in the refining process, ferrosilicon powder and aluminum particles are deoxidized, a small amount of silicon carbide is used to ensure the submerged arc effect, white slag refining is kept, ferrosilicon, metal manganese and low-carbon ferrochrome materials are used for fine adjustment of the components in the refining process, and steel is tapped after the chemical components and the temperature are proper; carrying out soft argon blowing after refining and tapping, strictly keeping molten steel from being exposed, and ensuring the soft argon blowing time;
(3) and (3) continuous casting control: the continuous casting drawing speed fluctuation is less than +/-0.1 m/min, a stopper rod bag is used as a tundish, and full-protection pouring measures are adopted; when the nozzle is sleeved with the hole in the continuous casting process, the casting is started after the flow is blocked, the lower connecting piece of the crystallizer and the nozzle are burnt, and if the casting speed is unchanged, the casting cannot be carried out, and the ladle is stopped; if the condition of continuous production after ladle replacement is not met, organizing molten steel to be subjected to remelting treatment: micro-carbon steel covering slag is used for continuous casting, and a medium covering agent is used for a tundish;
(4) cooling a steel billet: after the production of the steel billets is finished, the steel billets are stacked in a cargo space for not less than 36 hours, and hot billets are stored around the steel billets to realize the stacking cooling of the steel billets.
2. The method for producing a weather-resistant angle steel billet as claimed in claim 1, wherein: and (3) keeping white slag refining for 15min in the step (2).
3. The method for producing a weather-resistant angle steel billet as claimed in claim 1, wherein: and (3) performing soft argon blowing after the refined steel tapping in the step (2), and ensuring that the soft argon blowing time is not less than 20 min.
4. The method for producing a weather-resistant angle steel billet as claimed in claim 1, wherein: and (4) using an Al-Ca covering agent for the tundish in the step (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202110557416.3A CN113293333B (en) | 2021-05-21 | 2021-05-21 | Production method of weather-resistant angle steel billet |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110557416.3A CN113293333B (en) | 2021-05-21 | 2021-05-21 | Production method of weather-resistant angle steel billet |
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| CN113293333A true CN113293333A (en) | 2021-08-24 |
| CN113293333B CN113293333B (en) | 2022-05-06 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114107840A (en) * | 2021-11-09 | 2022-03-01 | 石横特钢集团有限公司 | HRB400cE chloride ion corrosion resistant steel bar and production process thereof |
| CN114134413A (en) * | 2021-11-09 | 2022-03-04 | 石横特钢集团有限公司 | HRB400FR fire-resistant steel bar and production process thereof |
| CN114293099A (en) * | 2021-12-03 | 2022-04-08 | 石横特钢集团有限公司 | High-toughness weather-resistant section steel and production process method thereof |
| CN115537501A (en) * | 2022-11-03 | 2022-12-30 | 石横特钢集团有限公司 | Slagging method for adding fluorite and refining pellets in LF (ladle furnace) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114134413A (en) * | 2021-11-09 | 2022-03-04 | 石横特钢集团有限公司 | HRB400FR fire-resistant steel bar and production process thereof |
| CN114293099A (en) * | 2021-12-03 | 2022-04-08 | 石横特钢集团有限公司 | High-toughness weather-resistant section steel and production process method thereof |
| CN115537501A (en) * | 2022-11-03 | 2022-12-30 | 石横特钢集团有限公司 | Slagging method for adding fluorite and refining pellets in LF (ladle furnace) |
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| Publication number | Publication date |
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| CN113293333B (en) | 2022-05-06 |
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Denomination of invention: A production method for weather resistant angle steel billets Effective date of registration: 20231222 Granted publication date: 20220506 Pledgee: Industrial and Commercial Bank of China Limited Feicheng sub branch Pledgor: SHIHENG SPECIAL STEEL GROUP Co.,Ltd. Registration number: Y2023980073806 |
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