CN114032356A - Low-cost composite pre-deoxidation method for molten steel - Google Patents
Low-cost composite pre-deoxidation method for molten steel Download PDFInfo
- Publication number
- CN114032356A CN114032356A CN202111356591.2A CN202111356591A CN114032356A CN 114032356 A CN114032356 A CN 114032356A CN 202111356591 A CN202111356591 A CN 202111356591A CN 114032356 A CN114032356 A CN 114032356A
- Authority
- CN
- China
- Prior art keywords
- molten steel
- slag
- coke powder
- oxygen
- refining furnace
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
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
Abstract
The invention discloses a low-cost composite pre-deoxidation method for molten steel, which comprises the following steps of: adding coke powder when the converter taps 1/3, so that the coke powder reacts with oxygen in molten steel in the tapping process, and adding deoxidized alloy 1-2min after the coke powder is added; before the molten steel reaches the processing position of the LF refining furnace, adding 20-30kg of coke powder on the slag surface, starting bottom blowing argon gas, stirring, and pre-deoxidizing oxygen in the slag; after the molten steel reaches the treatment position of the LF refining furnace, adding 20-40kg of calcium carbide on the slag surface, and deoxidizing the slag through stirring; if the slag turns black in the slagging process of the LF refining furnace, adding 20-40kg of calcium carbide again to deoxidize oxygen in the slag again; part of the materials used in the invention are coking tailings, and can partially replace deoxidized alloy; meanwhile, the deoxidation product is carbon monoxide or carbon dioxide, so that the cleanliness of molten steel can be effectively promoted, and good conditions are provided for improving the quality of products.
Description
Technical Field
The invention belongs to the technical field of steelmaking, and particularly relates to a low-cost composite pre-deoxidation method for molten steel.
Background
For the aluminum killed steel with a large proportion, aluminum alloy is generally adopted for deoxidation alloying in the converter tapping process, and aluminum particles or aluminum deoxidizer is adopted for slag deoxidation in the slagging process after molten steel after deoxidation alloying reaches refining LF. Regardless of the alloy used for deoxidation, the resulting oxide inclusions cause significant contamination of the molten steel.
The prior Chinese patent No. CN201911144136.9 discloses a refining agent and a refining process for scrap iron steelmaking, which expresses that a layer of calcium carbide is scattered on the surface of steel slag of molten steel after sampling, but the adding time and the adding amount are not explained. If the adding amount is too large, the slag in the steel ladle is excessively foamed, and the foamed slag overflows the steel ladle.
The prior refining method of the rail steel disclosed by the Chinese patent No. CN201510427243.8 has the following problems:
firstly, calcium carbide is added after tapping of the converter is finished, and at the moment, the oxygen potentials of molten steel and slag are high, so that the condition of slag overflow due to serious foaming is easy to occur;
secondly, after the molten steel reaches a refining LF furnace, calcium carbide is added under the condition that the flow of argon gas blowing is 150-200 Nl/min, the calcium carbide can be rolled into the molten steel (the oxygen content is very low after deoxidation alloying of the converter), and the predeoxidation effect and the foaming submerged arc effect of the calcium carbide on the slag are lost.
Disclosure of Invention
The invention aims to provide a low-cost composite pre-deoxidation method for molten steel.
The technical scheme adopted by the invention for solving the technical problems is as follows: a low-cost composite pre-deoxidation method for molten steel comprises the following steps: 1) adding coke powder when the converter taps 1/3, so that the coke powder reacts with oxygen in molten steel in the tapping process, and adding deoxidized alloy 1-2min after the coke powder is added;
2) before the molten steel reaches the processing position of the LF refining furnace, adding 20-30kg of coke powder on the slag surface, starting bottom blowing argon gas, stirring, and pre-deoxidizing oxygen in the slag;
3) after the molten steel reaches the treatment position of the LF refining furnace, adding 20-40kg of calcium carbide on the slag surface, and deoxidizing the slag through stirring;
4) and if the slag blackens in the slagging process of the LF refining furnace, adding 20-40kg of calcium carbide again to deoxidize the oxygen in the slag again.
Specifically, the adding amount of the coke powder in the step 1) is adjusted according to the converter end point oxygen and added according to an adding amount formula, wherein the adding amount formula is the converter end point oxygen content
OzThe unit is ppm.
The invention has the following beneficial effects: 1) the cost is reduced, the deoxidizer used by the invention is coke powder and calcium carbide which are used for replacing part of deoxidized alloy, so that the deoxidizing cost can be effectively reduced, particularly, the coke powder is a coking tailing material, and the material turnover cost in a factory can be ignored;
2) the quality of the molten steel is improved, the pre-deoxidizer used by the invention is coke powder and calcium carbide, and products of the pre-deoxidizer after the pre-deoxidizer participates in deoxidation are carbon monoxide and carbon dioxide gas, so that the gas can escape, and the pollution of the molten steel cannot be caused;
3) the calcium carbide deoxidizer has the functions of pre-deoxidation and foaming submerged arc in the use process of refining and slagging, and can effectively inhibit secondary oxidation in the process of smelting molten steel.
Detailed Description
The present invention will now be described in further detail.
A low-cost composite pre-deoxidation method for molten steel comprises the following steps: 1) when the converter discharges 1/3 steel, adding coke powder to make the coke powder fully react with oxygen in molten steel in the process of steel discharge, adding deoxidization alloy for deoxidization alloying after the coke powder is added for 1-2min, wherein the adding amount of the coke powder is adjusted according to the end point oxygen of the converter and the adding amount is adjusted according to a formula
(in the formula OzThe oxygen content at the end of the converter, unit is) is added;
2) adding 20-30kg of coke powder on the slag surface before the molten steel reaches an LF refining furnace and reaches a treatment position, starting bottom blowing argon gas to stir, and pre-deoxidizing oxygen in slag;
3) after the molten steel reaches the treatment position of the LF refining furnace, adding 20-40kg of calcium carbide on the slag surface, deoxidizing the slag by stirring, and simultaneously foaming the calcium carbide in the deoxidation process to improve the submerged arc effect;
4) if the slag turns black in the LF slagging process, 20-40kg of calcium carbide is added again to further deoxidize oxygen in the slag.
Part of the materials used in the invention are coking tailings, and can partially replace deoxidized alloy; meanwhile, the deoxidation product is carbon monoxide or carbon dioxide, so that the cleanliness of molten steel can be effectively promoted, and good conditions are provided for improving the quality of products.
The present invention is not limited to the above embodiments, and any structural changes made under the teaching of the present invention shall fall within the scope of the present invention, which is similar or similar to the technical solutions of the present invention.
The techniques, shapes, and configurations not described in detail in the present invention are all known techniques.
Claims (2)
1. The low-cost composite pre-deoxidation method for the molten steel is characterized by comprising the following steps of:
1) adding coke powder when the converter taps 1/3, so that the coke powder reacts with oxygen in molten steel in the tapping process, and adding deoxidized alloy 1-2min after the coke powder is added;
2) before the molten steel reaches the processing position of the LF refining furnace, adding 20-30kg of coke powder on the slag surface, starting bottom blowing argon gas, stirring, and pre-deoxidizing oxygen in the slag;
3) after the molten steel reaches the treatment position of the LF refining furnace, adding 20-40kg of calcium carbide on the slag surface, and deoxidizing the slag through stirring;
4) and if the slag blackens in the slagging process of the LF refining furnace, adding 20-40kg of calcium carbide again to deoxidize the oxygen in the slag again.
2. The low-cost composite pre-deoxidation method for molten steel of claim 1, characterized in that the coke powder addition in step 1) is adjusted according to the converter end point oxygen and added according to the addition formula,
wherein O iszThe oxygen content at the end of the converter is given in ppm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111356591.2A CN114032356A (en) | 2021-11-16 | 2021-11-16 | Low-cost composite pre-deoxidation method for molten steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111356591.2A CN114032356A (en) | 2021-11-16 | 2021-11-16 | Low-cost composite pre-deoxidation method for molten steel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114032356A true CN114032356A (en) | 2022-02-11 |
Family
ID=80144585
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111356591.2A Pending CN114032356A (en) | 2021-11-16 | 2021-11-16 | Low-cost composite pre-deoxidation method for molten steel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114032356A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114959173A (en) * | 2022-05-26 | 2022-08-30 | 湖南华菱涟源钢铁有限公司 | Use method of coke powder carburant |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102051440A (en) * | 2009-11-10 | 2011-05-11 | 攀钢集团钢铁钒钛股份有限公司 | Molten steel deoxidizing and carbureting method and steelmaking method |
| CN102321778A (en) * | 2011-09-22 | 2012-01-18 | 首钢总公司 | Method of deoxidation of medium carbon aluminum-containing steel in converter |
| CN106435084A (en) * | 2016-11-26 | 2017-02-22 | 湖南华菱湘潭钢铁有限公司 | Smelting method of ultralow-oxygen and medium-high-carbon steel |
| CN109439842A (en) * | 2018-12-29 | 2019-03-08 | 江苏利淮钢铁有限公司 | The production method of motor pawl machine AISI1006 steel |
| CN112626302A (en) * | 2020-11-26 | 2021-04-09 | 邯郸钢铁集团有限责任公司 | Smelting method of high-cleanliness microalloyed high-strength steel |
-
2021
- 2021-11-16 CN CN202111356591.2A patent/CN114032356A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102051440A (en) * | 2009-11-10 | 2011-05-11 | 攀钢集团钢铁钒钛股份有限公司 | Molten steel deoxidizing and carbureting method and steelmaking method |
| CN102321778A (en) * | 2011-09-22 | 2012-01-18 | 首钢总公司 | Method of deoxidation of medium carbon aluminum-containing steel in converter |
| CN106435084A (en) * | 2016-11-26 | 2017-02-22 | 湖南华菱湘潭钢铁有限公司 | Smelting method of ultralow-oxygen and medium-high-carbon steel |
| CN109439842A (en) * | 2018-12-29 | 2019-03-08 | 江苏利淮钢铁有限公司 | The production method of motor pawl machine AISI1006 steel |
| CN112626302A (en) * | 2020-11-26 | 2021-04-09 | 邯郸钢铁集团有限责任公司 | Smelting method of high-cleanliness microalloyed high-strength steel |
Non-Patent Citations (1)
| Title |
|---|
| 魏国立: "碳质材料脱氧技术在转炉渣的应用", 《中国冶金》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114959173A (en) * | 2022-05-26 | 2022-08-30 | 湖南华菱涟源钢铁有限公司 | Use method of coke powder carburant |
| CN114959173B (en) * | 2022-05-26 | 2024-03-22 | 湖南华菱涟源钢铁有限公司 | Use method of coke powder carburant |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102719593B (en) | Method for smelting ultra-low carbon steel | |
| CN109628705B (en) | RH refining method of low-carbon stainless steel | |
| CN110229992B (en) | Smelting production method of titanium microalloyed low-cost Q355B steel plate | |
| CN103911487B (en) | A kind of method of smelting suprelow carbon steel and the method for continuous casting ultra low-carbon steel | |
| CN102719600A (en) | Production method of ultra low carbon steel | |
| CN111041147B (en) | Method for controlling B-type inclusions in pipeline steel | |
| CN109402327B (en) | External refining production method of ultrapure high-carbon chromium bearing steel | |
| CN104004881A (en) | Method for controlling nitrogen content in process of producing aluminium deoxidation high-carbon steel | |
| CN110468257B (en) | Ladle top slag modification method suitable for low-carbon and ultra-low-carbon steel | |
| CN109252010B (en) | Smelting method for controlling oxidability of IF steel top slag | |
| CN112626302B (en) | Smelting method of high-cleanliness microalloyed high-strength steel | |
| CN113249542A (en) | Smelting process for improving purity degree and impurity plastification of spring steel and spring steel | |
| CN115595397A (en) | Accurate nitrogen control method for nitrogen-containing high-strength steel | |
| CN114032356A (en) | Low-cost composite pre-deoxidation method for molten steel | |
| CN105624367A (en) | Refining device and method for controlling nitrogen content of molten steel | |
| CN107974528B (en) | Method for reducing nitrogen content of molten steel at converter end point | |
| CN108642239B (en) | Method for alloying molten steel silicon and treating calcium by using metal-containing calcium-silicon-iron alloy | |
| CN114293101B (en) | Economical high-grade welding wire steel H04E and preparation method thereof | |
| CN114292984B (en) | LF refining slag component research [ Mn ] [ Si ] element RC process method | |
| CN111961951B (en) | Smelting method of phosphorus-containing ultra-low carbon steel | |
| CN114836593A (en) | Smelting process of low-carbon aluminum-containing cold forging steel | |
| CN114854935A (en) | Deoxidation smelting method for slab Q235 steel and slab Q235 steel | |
| CN114657323A (en) | Deep desulfurization method for LF (ladle furnace) | |
| KR20130014924A (en) | Manufacturing method of duplex stainless steel | |
| CN112680557A (en) | Dephosphorization method for smelting ultra-low phosphorus steel |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20220211 |