CN114990285A - Nitrogen increasing method for low-alloy high-strength steel - Google Patents
Nitrogen increasing method for low-alloy high-strength steel Download PDFInfo
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- CN114990285A CN114990285A CN202210679963.3A CN202210679963A CN114990285A CN 114990285 A CN114990285 A CN 114990285A CN 202210679963 A CN202210679963 A CN 202210679963A CN 114990285 A CN114990285 A CN 114990285A
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- nitrogen
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- strength steel
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- steel
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 110
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 74
- 239000010959 steel Substances 0.000 title claims abstract description 74
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 55
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 46
- 239000000956 alloy Substances 0.000 title claims abstract description 46
- 238000000034 method Methods 0.000 title claims abstract description 35
- 230000001965 increasing effect Effects 0.000 title claims abstract description 24
- 239000000843 powder Substances 0.000 claims abstract description 24
- 238000010079 rubber tapping Methods 0.000 claims abstract description 21
- 230000008569 process Effects 0.000 claims abstract description 18
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000002893 slag Substances 0.000 claims abstract description 17
- 238000005406 washing Methods 0.000 claims abstract description 14
- 238000007670 refining Methods 0.000 claims description 5
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 3
- 238000003723 Smelting Methods 0.000 abstract description 7
- 238000009851 ferrous metallurgy Methods 0.000 abstract 1
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 10
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 8
- 229910001199 N alloy Inorganic materials 0.000 description 7
- SKKMWRVAJNPLFY-UHFFFAOYSA-N azanylidynevanadium Chemical compound [V]#N SKKMWRVAJNPLFY-UHFFFAOYSA-N 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 7
- 238000007664 blowing Methods 0.000 description 6
- 229910052786 argon Inorganic materials 0.000 description 5
- 238000009749 continuous casting Methods 0.000 description 5
- 238000005096 rolling process Methods 0.000 description 5
- 229910052742 iron Inorganic materials 0.000 description 4
- 229910052720 vanadium Inorganic materials 0.000 description 4
- 238000005275 alloying Methods 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 238000009628 steelmaking Methods 0.000 description 3
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- RRZKHZBOZDIQJG-UHFFFAOYSA-N azane;manganese Chemical compound N.[Mn] RRZKHZBOZDIQJG-UHFFFAOYSA-N 0.000 description 2
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 229910001021 Ferroalloy Inorganic materials 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- YYXHRUSBEPGBCD-UHFFFAOYSA-N azanylidyneiron Chemical compound [N].[Fe] YYXHRUSBEPGBCD-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 239000010436 fluorite Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 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
- C21C7/0006—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
- 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
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/52—Manufacture of steel in electric furnaces
-
- 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
- C21C7/0075—Treating in a ladle furnace, e.g. up-/reheating of molten steel within the ladle
-
- 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
- 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
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention discloses a nitrogen increasing method for low-alloy high-strength steel, and belongs to the technical field of ferrous metallurgy. And smelting the low-alloy high-strength steel by adopting a duplex mode of adding AD powder for increasing nitrogen in a slag washing mode and subsequently adding a nitrogen-containing alloy for increasing nitrogen in the tapping process of a converter or an electric furnace. The method solves the problem of high alloy nitrogen increasing cost in the current general smelting process, and can stably control the nitrogen content in the low-alloy high-strength steel to be 80-150 ppm.
Description
Technical Field
The invention relates to the technical field of steel smelting, in particular to a nitrogen increasing method for low-alloy high-strength steel.
Background
Nitrogen is generally considered to be one of the harmful impurities in steel. Although the solubility of nitrogen in liquid steel is low at normal pressure, these small amounts of nitrogen can cause age embrittlement of the steel, and various secondary refining techniques for reducing nitrogen in liquid steel have been developed and are being continuously improved. However, nitrogen as an alloying element may interact with other alloying elements in the steel (e.g., Mn, Cr, V, Nb, Ti, etc.) to impart many superior properties to the steel. For example, the stability of austenite is improved, the mechanical properties of steel are greatly improved, the corrosion resistance of steel is improved, and the like.
In order to improve the strength and reduce the alloy cost, most of low-alloy high-strength steel adopts a process of increasing nitrogen and reducing vanadium, and the key of the process of increasing nitrogen and reducing vanadium is to ensure the stability of nitrogen content. Most domestic steel mills adopt a mode of adding nitrogen-containing ferroalloy to increase nitrogen, and alloys such as vanadium and nitrogen are expensive, so that the profit margin of low-alloy high-strength steel is extruded, and the market competitiveness of the low-alloy high-strength steel is reduced. And in some steel mills, nitrogen is increased by blowing nitrogen, but the recovery rate of nitrogen is unstable. Therefore, the key to expand market share and improve benefit of the low-alloy high-strength steel is that the nitrogen alloying can be realized and the production cost can be reduced.
Disclosure of Invention
In view of the prior art, the invention aims to provide a nitrogen increasing method for low-alloy high-strength steel.
The invention provides a nitrogen increasing method for low-alloy high-strength steel, which comprises the following steps: in the process of tapping of the converter or the electric furnace, the AD powder is adopted for carrying out slag washing nitrogen increasing and adding nitrogen-containing alloy for carrying out duplex nitrogen increasing, or in the process of tapping of the converter and the electric furnace, the AD powder is adopted for carrying out slag washing nitrogen increasing and adding nitrogen-containing alloy for carrying out duplex nitrogen increasing in the later refining stage.
Preferably, AD powder, namely the steel-making promoter, is added in a slag washing mode in the tapping process, and the main component is Al 2 O 3 And part of active Al (metal Al and AlN), wherein the nitrogen content (mass percentage) is 6-12%, and the nitrogen content is divided into AD15 (containing active Al 15%), AD20 (containing active Al 20%) and the like according to the content of the active Al.
Further preferably, when the AD powder is added by slag washing, active Al contained in the AD powder rapidly reacts with oxygen in the molten steel. If the lime is added immediately after the AD powder is added, the slagging speed and the slag temperature can be rapidly improved because the heat is concentrated on the surface of the molten steel, and in addition, A1 in the AD powder 2 O 3 The substances generated by the reaction with the aluminum oxide are combined with CaO to generate calcium aluminate with low melting point, and the slag has good fluidity and does not need to be added with fluorite. Meanwhile, the oxygen content in steel and slag is reduced, and the desulfurization is facilitated. The washing of the calcium aluminate slag generated by the AD powder and the CaO has better capability of absorbing the inclusion.
4Al+3O 2 ＝＝＝＝Al 2 O 3
2CaO+S＝＝＝＝2CaS+O 2
And further preferably, the nitrogen increasing effect of the AD powder with the nitrogen content of 6-12% is obvious during tapping.
More preferably, the AD powder is added in a slag washing mode in the tapping process, and the adding amount is 2 kg/ton steel to 4 kg/ton steel.
2AlN＝＝＝＝2Al+N 2
Further preferably, the AD powder is added in a slag washing mode during tapping.
Further preferably, the AD powder is added with the steel stream at 1/3 to 1/2 of the steel tapped from the primary converter.
Further preferably, in the process without refining, an appropriate amount of nitrogen-containing alloy is added when tapping 1/2 to 2/3 from the primary smelting furnace.
Further preferably, the added nitrogen-containing alloy is a vanadium-nitrogen alloy or a conventional nitrogen-increasing alloy such as manganese nitride.
Further preferably, the AD powder has the functions of deoxidation and slagging, and the recovery rate of the nitrogen-containing alloy in the steelmaking process can be improved by adding the AD powder firstly.
The invention has the beneficial effects that:
according to the invention, the smelting of the low-alloy high-strength steel is carried out in a duplex mode of adding the AD powder in a slag washing mode and adding the nitrogen-containing alloy such as vanadium-nitrogen alloy or manganese nitride and the like in the tapping process, so that the nitrogen content of the low-alloy high-strength steel obtained by smelting is effectively ensured to be 80-150ppm, the method is an effective supplement of the existing steelmaking process, and a new thought and direction are provided for nitrogen increase of the low-alloy high-strength steel; meanwhile, the invention adopts the AD powder with low price and the nitrogen-containing alloy duplex mode to increase the nitrogen, has low cost and stable nitrogen increase of the alloy, and can effectively solve the nitrogen increase trouble of smelting low-alloy high-strength steel.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
In order to make the technical solutions of the present application more clearly understood by those skilled in the art, the technical solutions of the present application will be described in detail below with reference to specific embodiments.
The test materials used in the examples of the present invention are all conventional in the art and commercially available.
Example 1
The method is characterized in that the nitrogen-containing low-alloy high-strength steel is produced by adopting a production process of an electric furnace, argon blowing at the bottom of a steel ladle, continuous casting and steel rolling, 2 kg/ton of steel AD15 (containing 9% of nitrogen) is added in a slag washing mode when the steel tapping amount reaches 1/3-1/2 under the condition that 50% of molten iron is added in the electric furnace, 1 kg/ton of steel vanadium-nitrogen alloy VN12 is added when the steel tapping amount reaches 1/2-2/3, and the nitrogen content in the steel is measured to be 110-130 ppm according to an inert gas melting thermal conductivity method for measuring the iron-nitrogen content of steel GBT 20124 and 2006.
Example 2
The production process of converter, ladle bottom argon blowing, continuous casting and steel rolling is adopted to produce the nitrogen-containing low-alloy high-strength steel, when the steel tapping amount of the converter reaches 1/3-1/2, 4 kg/ton of steel AD15 (containing 9% of nitrogen) is added in a slag washing mode, when the steel tapping amount reaches 1/2-2/3, 1 kg/ton of steel vanadium-nitrogen alloy VN12 is added, and the nitrogen content in the steel can reach 120-150 ppm.
Comparative example 1:
the production process of the nitrogen-containing low-alloy high-strength steel comprises the steps of adopting an electric furnace, argon blowing at the bottom of a steel ladle, continuous casting and steel rolling, and relates to the process parameters which are the same as those of the embodiment 1, wherein AD powder and vanadium-nitrogen alloy are not added in the tapping process under the condition that 50% of molten iron is added in the electric furnace, and the nitrogen content in the smelted low-alloy high-strength steel can reach 40-50 ppm.
Comparative example 2:
the production process of the nitrogen-containing low-alloy high-strength steel comprises the steps of adopting an electric furnace, argon blowing from the bottom of a steel ladle, continuous casting and steel rolling, and relates to the process parameters which are the same as those in the embodiment 1, wherein in the state that 50% of molten iron is added into the electric furnace, when the tapping steel amount reaches 1/3-1/2, 2 kg/ton of steel AD15 (containing 9% of nitrogen) is added in a slag washing mode, vanadium-nitrogen alloy is not added, and the nitrogen content in the steel can reach 75-90 ppm.
Comparative example 3:
the production process of producing the nitrogen-containing low-alloy high-strength steel by adopting the production process of an electric furnace, argon blowing from the bottom of a steel ladle, continuous casting and steel rolling has the same process parameters as those of the embodiment 1, AD powder is not added in the tapping process under the condition that 50% molten iron is added in the electric furnace, 1 kg/ton of steel vanadium-nitrogen alloy VN12 is added when the tapping amount reaches 1/2-2/3, and the nitrogen content in the steel can reach 80-110 ppm.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (7)
1. A nitrogen increasing method for low-alloy high-strength steel is characterized by comprising the following steps:
in the process of tapping of a converter or an electric furnace, AD powder slag washing and nitrogen-containing alloy addition are sequentially adopted for carrying out duplex nitrogen increase;
or, AD powder slag washing is adopted in the tapping process of the converter or the electric furnace, and the nitrogen-containing alloy is added in the later period of refining to carry out duplex nitrogen increasing.
2. The method of increasing nitrogen content in low-alloy high-strength steel according to claim 1, wherein the main component of the AD powder is Al 2 O 3 And active Al, wherein the nitrogen content is 6-12%.
3. The method for increasing nitrogen content in low-alloy high-strength steel according to claim 1, wherein the AD powder is added in such a manner that the tapping amount of the converter or the electric furnace reaches 1/3-1/2.
4. The method of increasing nitrogen content in a low alloy high strength steel according to claim 1, wherein the AD powder is added in an amount of 2 kg/ton to 4 kg/ton of steel.
5. The method of increasing nitrogen content in a low alloy high strength steel according to claim 1, wherein the nitrogen-containing alloy is added when the tapping amount of the primary refining furnace reaches 1/2 to 2/3 for the unrefined process.
6. A low alloy high strength steel obtained by the nitrogen increasing method of a low alloy high strength steel according to claims 1 to 5.
7. The low alloy, high strength steel of claim 6, having a nitrogen content of 80ppm to 150 ppm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210679963.3A CN114990285A (en) | 2022-06-16 | 2022-06-16 | Nitrogen increasing method for low-alloy high-strength steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210679963.3A CN114990285A (en) | 2022-06-16 | 2022-06-16 | Nitrogen increasing method for low-alloy high-strength steel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114990285A true CN114990285A (en) | 2022-09-02 |
Family
ID=83035407
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210679963.3A Pending CN114990285A (en) | 2022-06-16 | 2022-06-16 | Nitrogen increasing method for low-alloy high-strength steel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114990285A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111826498A (en) * | 2020-07-31 | 2020-10-27 | 唐山飞迪冶金材料有限公司 | Additive for increasing strength of deformed steel bar and preparation method and application thereof |
| CN111826497A (en) * | 2020-07-30 | 2020-10-27 | 张彦辉 | Microalloy nitrogen increasing agent and application thereof |
-
2022
- 2022-06-16 CN CN202210679963.3A patent/CN114990285A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111826497A (en) * | 2020-07-30 | 2020-10-27 | 张彦辉 | Microalloy nitrogen increasing agent and application thereof |
| CN111826498A (en) * | 2020-07-31 | 2020-10-27 | 唐山飞迪冶金材料有限公司 | Additive for increasing strength of deformed steel bar and preparation method and application thereof |
Non-Patent Citations (1)
| Title |
|---|
| 王文虎;李冰;孟显祖;许军民;: "工业铝灰(AD粉)在炼钢生产中应用与分析", 河南冶金, no. 06, pages 43 - 45 * |
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Application publication date: 20220902 |