CN113025780A - Production method of ultrahigh nitrogen tin plate - Google Patents
Production method of ultrahigh nitrogen tin plate Download PDFInfo
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- CN113025780A CN113025780A CN202110208673.6A CN202110208673A CN113025780A CN 113025780 A CN113025780 A CN 113025780A CN 202110208673 A CN202110208673 A CN 202110208673A CN 113025780 A CN113025780 A CN 113025780A
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- 239000005028 tinplate Substances 0.000 title claims abstract description 38
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 21
- CMLMFNACXHHYRY-UHFFFAOYSA-N azanylidynetin Chemical compound [N].[Sn] CMLMFNACXHHYRY-UHFFFAOYSA-N 0.000 title claims abstract description 20
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 229
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 118
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 64
- 239000010959 steel Substances 0.000 claims abstract description 64
- 238000007664 blowing Methods 0.000 claims abstract description 55
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 claims abstract description 53
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 41
- 239000000956 alloy Substances 0.000 claims abstract description 41
- 238000003723 Smelting Methods 0.000 claims abstract description 25
- 230000001965 increasing effect Effects 0.000 claims abstract description 20
- 238000007670 refining Methods 0.000 claims abstract description 18
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 12
- 238000009749 continuous casting Methods 0.000 claims abstract description 12
- 238000005275 alloying Methods 0.000 claims abstract description 9
- 238000005266 casting Methods 0.000 claims abstract description 6
- 229910052742 iron Inorganic materials 0.000 claims abstract description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 25
- 239000001301 oxygen Substances 0.000 claims description 25
- 229910052760 oxygen Inorganic materials 0.000 claims description 25
- 238000000034 method Methods 0.000 claims description 14
- 229910000604 Ferrochrome Inorganic materials 0.000 claims description 4
- 229910000616 Ferromanganese Inorganic materials 0.000 claims description 4
- 229910000519 Ferrosilicon Inorganic materials 0.000 claims description 4
- 229910000628 Ferrovanadium Inorganic materials 0.000 claims description 4
- 229910052799 carbon Inorganic materials 0.000 claims description 4
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 claims description 4
- PNXOJQQRXBVKEX-UHFFFAOYSA-N iron vanadium Chemical compound [V].[Fe] PNXOJQQRXBVKEX-UHFFFAOYSA-N 0.000 claims description 4
- 230000001914 calming effect Effects 0.000 claims 1
- 230000000052 comparative effect Effects 0.000 description 11
- 230000003749 cleanliness Effects 0.000 description 6
- 230000009286 beneficial effect Effects 0.000 description 5
- 238000012986 modification Methods 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- 230000000630 rising effect Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 206010039897 Sedation Diseases 0.000 description 2
- 229910001566 austenite Inorganic materials 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 230000036280 sedation Effects 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000004040 coloring Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 229910000734 martensite Inorganic materials 0.000 description 1
- CSJDCSCTVDEHRN-UHFFFAOYSA-N methane;molecular oxygen Chemical compound C.O=O CSJDCSCTVDEHRN-UHFFFAOYSA-N 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 239000005022 packaging material Substances 0.000 description 1
- 229910001562 pearlite Inorganic materials 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
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Classifications
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- 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
-
- 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
- C21C7/10—Handling in a vacuum
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The embodiment of the invention discloses a production method of an ultrahigh nitrogen tin plate, which comprises the following steps of smelting molten iron to obtain molten steel; refining the molten steel, blowing nitrogen in the refining, vacuumizing until the vacuum degree is controlled to be 2-15 KPa, adding a nitrogen-containing alloy for alloying, and breaking the air after circulation to obtain refined molten steel; and (3) after the refined molten steel is calmed, carrying out continuous casting to obtain a tin plate casting blank with the nitrogen content being more than or equal to 150 ppm. According to the embodiment of the invention, the high-nitrogen tin plate product with high purity is produced at low cost under the conditions of nitrogen blowing, nitrogen increasing, nitrogen-containing alloy adding and reasonable converter, refining and continuous casting smelting.
Description
Technical Field
The embodiment of the invention relates to the technical field of steel making, in particular to a production method of an ultrahigh nitrogen tin plate.
Background
The tin plate (commonly called tinplate) is made up by double-side plating of pure tin on low-carbon cold-rolled sheet, and possesses high strength, good formability, excellent corrosion resistance, strong weldability, bright appearance and good printing colouring property, and its tin-plated layer is non-toxic, so that it can be extensively used in food industry and non-food industry for making various containers, punched products and packaging materials, etc.. For food safety reasons, Nb, V, Ti, etc. often cannot be added as a strengthening element to a tin plate, and the strengthening effect of N element in a tin plate is widely used. The N element can enlarge an austenite region, form a certain amount of austenite during high-temperature continuous annealing, and form a certain amount of pearlite and martensite structures during rapid cooling so as to improve the strength of the strip steel.
The western law states that: the nitrogen content in the molten steel is in direct proportion to the square root of the partial pressure of the external nitrogen, namely, the nitrogen content in the molten steel shows a rising trend along with the rising of the external nitrogen content. At present, the ultra-high nitrogen steel is mostly produced by adopting a high-pressure or normal-pressure nitrogen increasing mode, and in order to ensure the cleanliness of the ultra-high nitrogen tin plate, the technical difficulties of slow nitrogen increasing rate, difficult nitrogen increasing and the like need to be technically overcome when the ultra-high nitrogen tin plate is produced under the vacuum condition.
Therefore, how to develop a method for producing an ultra-high nitrogen tin plate with high cleanliness is a technical problem to be solved urgently.
Disclosure of Invention
The embodiment of the invention aims to provide a method for producing an ultrahigh nitrogen tin plate, which meets the control requirement of ultrahigh nitrogen components of the tin plate and has high cleanliness.
In order to achieve the above object, an embodiment of the present invention provides a method for producing an ultra-high nitrogen tin plate, including:
smelting molten iron to obtain molten steel;
refining the molten steel, blowing nitrogen in the refining, vacuumizing until the vacuum degree is controlled to be 2-15 KPa, adding a nitrogen-containing alloy for alloying, and breaking the air after circulation to obtain refined molten steel;
and (3) after the refined molten steel is calmed, carrying out continuous casting to obtain a tin plate casting blank with the nitrogen content being more than or equal to 150 ppm.
Further, when the vacuum degree is controlled to be 2-15 KPa, the nitrogen blowing amount is 20-150 ppm in parts per million concentration; and the nitrogen blowing time t is delta N/v, wherein delta N is the nitrogen blowing amount of the steel, and v is the nitrogen increasing rate of the molten steel.
Further, the nitrogenous alloy specifically comprises one of nitrogenous ferrochrome, nitrogenous ferromanganese, nitrogenous ferrovanadium and nitrogenous ferrosilicon, and the alloy addition amount is (N element target value-N element content) x molten steel amount/(the yield of the nitrogenous alloy x N element content in the nitrogenous alloy).
Further, the air breaking temperature is controlled to be 1570-1600 ℃.
Further, the sedation time is 10-50 min.
Further, in the smelting treatment, firstly oxygen blowing is carried out by a converter, then nitrogen blowing is carried out by an oxygen lance, the nitrogen blowing time of the oxygen lance is controlled to be 0.5-5 min, and the nitrogen blowing amount of the oxygen lance is controlled to be 0.2-0.8 Nm3The steel is treated by the method, wherein the lance position of the oxygen lance is controlled to be 1.4-2.0 m; the nitrogen flow of the oxygen lance is 3000-7000 Nm3/h。
Further, in the smelting treatment, nitrogen is bottom blown in the whole process, and when the nitrogen bottom blowing amount is 50% -70% of the total oxygen blowing amount, the nitrogen bottom blowing amount is adjusted to 1000-5000 Nm3/h。
Furthermore, the mass fraction of C in the low-carbon high-nitrogen molten steel is less than or equal to 0.06%, and the mass fraction of N is more than or equal to 50 ppm.
Furthermore, in the smelting treatment, the smelting end point temperature is controlled to be 1670-1700 ℃.
One or more technical solutions in the embodiments of the present invention have at least the following technical effects or advantages:
according to the production method of the ultrahigh nitrogen tin plate provided by the embodiment of the invention, molten iron is smelted to obtain molten steel; refining the molten steel, blowing nitrogen in the refining, vacuumizing until the vacuum degree is controlled to be 2-15 KPa, adding a nitrogen-containing alloy for alloying, and breaking the air after circulation to obtain refined molten steel; after the refined molten steel is calmed, continuous casting is carried out to obtain a tin plate casting blank with the nitrogen content being more than or equal to 150 ppm; the high-nitrogen tin plate product with high purity can be produced at low cost by blowing nitrogen and increasing nitrogen under the vacuum condition, adding a nitrogen-containing alloy and under the reasonable converter, refining and continuous casting smelting conditions, so that the requirements of stable control of ultrahigh nitrogen components of the tin plate are met, and the cleanliness is high.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a flow chart of a method for producing an ultra-high nitrogen tin plate according to an embodiment of the present invention.
Detailed Description
The embodiments of the present invention will be described in detail below with reference to specific embodiments and examples, and the advantages and various effects of the embodiments of the present invention will be more clearly apparent therefrom. It will be understood by those skilled in the art that the present embodiments and examples are illustrative of the present invention and are not to be construed as limiting the present invention.
Throughout the specification, unless otherwise specifically noted, terms used herein should be understood as having meanings as commonly used in the art. Accordingly, 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 embodiments of the invention belong. If there is a conflict, the present specification will control.
Unless otherwise specifically stated, various raw materials, reagents, instruments, equipment and the like used in the examples of the present invention are commercially available or can be prepared by an existing method.
In order to solve the technical problems, the embodiment of the invention provides the following general ideas:
according to an exemplary embodiment of the present invention, there is provided a method for producing an ultra-high nitrogen tin plate, as shown in fig. 1, including:
s1, smelting molten iron to obtain molten steel;
as an optional implementation mode, after the oxygen blowing of the converter is finished, the nitrogen blowing of the oxygen lance is carried out, the nitrogen blowing time is controlled to be 0.5-5 min, and the nitrogen blowing amount is controlled to be 0.1-0.5 Nm3The steel is treated by the method, wherein the position of a gun is controlled to be 1.4-2.0 m; the nitrogen flow is 3000-7000 Nm3/h。
The control of the nitrogen blowing parameter is beneficial to the nitrogen content at the end point of the converter; if the nitrogen blowing time is less than 0.5min, the lance position is too high, the nitrogen content at the end point of the converter is low, and the RH nitrogen increasing difficulty is increased; if the oxygen blowing time is more than 5min, the nitrogen blowing amount is too large, the lance position is too low, and the end point temperature of the converter is low, so that RH oxygen blowing temperature rise influences the purity of molten steel.
In the smelting treatment, nitrogen is used in the whole bottom blowing process, and when the nitrogen bottom blowing amount is 50-70% of the total oxygen blowing amount, the nitrogen bottom blowing amount is adjusted to 1000-5000 Nm3H is used as the reference value. Thus, the nitrogen removal of the molten steel caused by violent carbon-oxygen reaction in the earlier stage of smelting can be avoided, and the nitrogen content of the molten steel after smelting is improved.
As an optional embodiment, in the smelting treatment, the smelting end point temperature is controlled to be 1670-1700 ℃. The temperature range is beneficial to the stable control of the temperature of the subsequent refined molten steel, and if the smelting end point temperature is too low, RH oxygen blowing and temperature rising are not beneficial to the purity of the molten steel; if the smelting end point temperature is too high, the corrosion of refractory materials of the smelting furnace is increased.
S2, refining the molten steel, blowing nitrogen in the refining, vacuumizing until the vacuum degree is controlled to be 2-15 KPa, adding a nitrogen-containing alloy for alloying, and breaking the air after circulation to obtain refined molten steel;
when the vacuum degree is 2-15 KPa, the reason for adding the nitrogen-containing alloy is as follows: the nitrogen increasing amount of the nitrogen-containing alloy used alone cannot meet the nitrogen increasing requirement, the molten steel has a nitrogen removal phenomenon after the alloy is added, and nitrogen blowing is needed to pre-increase nitrogen in the early stage of refining. When the vacuum degree is less than 2KPa, nitrogen is blown, the nitrogen increasing rate is reduced, and the nitrogen is not increased in the molten steel and even the nitrogen removal phenomenon occurs; when the vacuum degree is more than 15KPa for nitrogen blowing, the lifting height of the molten steel treated by RH is insufficient, the molten steel can not circulate in a ladle and an RH vacuum chamber, and the nitrogen increasing effect can not be achieved; and after nitrogen blowing is finished, adding a nitrogen-containing alloy for alloying, so that the molten steel can be rapidly subjected to nitrogen increase to the target nitrogen content.
When the vacuum degree is controlled to be 2-15 KPa, the nitrogen blowing amount is 20-150 ppm in parts per million concentration; the nitrogen blowing amount is 20-150 ppm, the nitrogen content of the molten steel before alloying is favorably improved, the nitrogen increasing amount of the nitrogen-containing alloy is reduced, and the nitrogen content of the refined molten steel is improved.
And the nitrogen blowing time t is delta N/v, wherein delta N is the nitrogen blowing amount (ppm) of the steel, and v is the nitrogen increasing rate (ppm/min, range of 0.5-3ppm/min) of the molten steel.
As an alternative embodiment, the nitrogen-containing alloy specifically includes one of nitrogen-containing ferrochrome, nitrogen-containing ferromanganese, nitrogen-containing ferrovanadium, and nitrogen-containing ferrosilicon, and the addition amount of the nitrogen-containing alloy is (target value of N element-content of N element before the nitrogen-containing alloy is added) x amount of molten steel/(yield of the nitrogen-containing alloy x content of N element in the nitrogen-containing alloy); in general, the amount of the nitrogen-containing alloy added may be ± 400kg from the theoretical value calculated by the formula, that is, the amount of the nitrogen-containing alloy added may deviate from the theoretical value calculated by the formula by ± 400 kg. If the amount of the nitrogen-containing alloy is more than +400kg of the theoretical value calculated by the formula, the vacuum denitrification phenomenon is serious, and the influence of unstable nitrogen increase exists; if the nitrogen content is less than the theoretical value of-400 kg calculated by the formula, the influence that the content of the finished nitrogen cannot meet the target requirement exists;
wherein the nitrogen content of the nitrogen-containing alloy is 2-10%. Not only is beneficial to ensuring the requirement of nitrogen increasing amount of the molten steel, but also is beneficial to controlling the alloy cost.
As an optional implementation mode, aluminum is not added in the RH treatment, oxygen blowing and temperature rising are carried out, air breaking is carried out after circulation is carried out for 3-8 min, and the air breaking temperature is controlled within the range of 1570-1600 ℃. The temperature range is favorable for smooth pouring of continuous casting, and if the air breaking temperature is too low, the tundish temperature is low and continuous casting frozen flow hidden danger exists; if the temperature of the broken cavity is too high, the continuous casting blank shell is thin, and the risk of steel leakage exists.
And S3, after the refined molten steel is calmed, carrying out continuous casting to obtain a tin plate casting blank with the nitrogen content being more than or equal to 150 ppm.
As an alternative embodiment, the sedation time is controlled within 10-50 min; is favorable for removing the inclusion in the molten steel.
According to the production method of the ultrahigh nitrogen tin plate, provided by the embodiment of the invention, vacuumizing treatment is carried out in refining, the vacuum degree after vacuumizing treatment is measured, the vacuum degree is 2-15 KPa, nitrogen is blown by taking nitrogen as lifting gas, then nitrogen-containing alloy is added for alloying, and after circulation, the air is broken to obtain refined molten steel, so that the ultrahigh nitrogen component control requirement of the tin plate is met, and the cleanliness is high.
The following will explain in detail a method for producing an ultra-high nitrogen tin plate according to the present application with reference to examples, comparative examples and experimental data.
Step S1, smelting molten iron to obtain molten steel;
after the converter finishes oxygen blowing, carrying out oxygen lance nitrogen blowing, wherein the nitrogen blowing time is controlled to be 0.5-5 min, and the nitrogen blowing amount is controlled to be (0.2) - (0.8) Nm3The steel is/t, the gun position is controlled to be (1.4) - (2.0) m; the nitrogen flow is 3000-7000 Nm3/h。
The nitrogen is used in the whole bottom blowing process, and when the oxygen blowing amount is 50-70% of the total oxygen blowing amount, the flow of the nitrogen used in the bottom blowing of the converter is adjusted to 1000-5000 Nm3/h。
The smelting end point temperature is controlled to be 1670-1700 ℃;
the mass fraction of C in the low-carbon high-nitrogen molten steel is less than or equal to 0.06%, and the mass fraction of N is more than or equal to 50 ppm.
The process parameters for each example and each comparative example are tabulated in table 1.
TABLE 1
S2, refining the molten steel, blowing nitrogen in the refining, vacuumizing until the vacuum degree is controlled to be 2-15 KPa, adding a nitrogen-containing alloy for alloying, and breaking the air after circulation to obtain refined molten steel;
the air breaking temperature is controlled to be 1570-1600 ℃.
The nitrogenous alloy specifically comprises one of nitrogenous ferrochrome, nitrogenous ferromanganese, nitrogenous ferrovanadium and nitrogenous ferrosilicon, and the alloy addition amount is (N element target value-N element content) x molten steel amount before the nitrogenous alloy is added/(the yield of the nitrogenous alloy x N element content in the nitrogenous alloy).
TABLE 2
And step S3, performing continuous casting after the refined molten steel is calmed to obtain a tinned plate casting blank with the nitrogen content being more than or equal to 150 ppm.
The compositions of the tin plate cast slabs obtained in each example and each comparative example are shown in table 3.
TABLE 3
| Group of | C％ | Si％ | Mn％ | P％ | S％ | Alt％ | N％ |
| Example 1 | 0.06 | 0.01 | 0.37 | 0.009 | 0.005 | 0.016 | 0.0152 |
| Example 2 | 0.07 | 0.01 | 0.39 | 0.008 | 0.007 | 0.020 | 0.0197 |
| Example 3 | 0.07 | 0.01 | 0.39 | 0.007 | 0.005 | 0.018 | 0.0171 |
| Comparative example 1 | 0.06 | 0.01 | 0.33 | 0.010 | 0.008 | 0.021 | 0.0081 |
| Comparative example 2 | 0.07 | 0.02 | 0.36 | 0.005 | 0.005 | 0.028 | 0.0092 |
| Comparative example 3 | 0.06 | 0.01 | 0.33 | 0.010 | 0.008 | 0.021 | 0.0117 |
| Comparative example 4 | 0.07 | 0.02 | 0.32 | 0.007 | 0.004 | 0.012 | 0.0140 |
From the data in table 3, it can be seen that:
in the comparative example 1, the vacuum degree is too small during nitrogen blowing, so that the nitrogen increasing rate is reduced, and the molten steel does not increase nitrogen and even has the defect of nitrogen removal;
in comparative example 2, the vacuum degree was too high during nitrogen blowing, and there were disadvantages that the molten steel was not lifted up to a high degree by RH treatment and the molten steel could not be circulated in the ladle and the RH vacuum chamber.
In comparative example 3, no nitrogen-containing alloy was added during refining, and the disadvantage that the RH-finished nitrogen content was not 150ppm was observed.
In the comparative example 4, the addition amount of the nitrogen-containing alloy is out of the range of the embodiment of the invention, and the defects of nitrogen increase amount which can not meet the requirement, unstable nitrogen increase and the like exist;
in the embodiments 1 to 3, the high-nitrogen tin plate product with high purity is produced at low cost by blowing nitrogen and increasing nitrogen under the vacuum condition, adding the nitrogen-containing alloy and reasonably adopting converter, refining and continuous casting smelting conditions, the ultrahigh nitrogen component control requirement of the tin plate is met, and the cleanliness is high.
Finally, it should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the embodiments of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made in the embodiments of the present invention without departing from the spirit or scope of the embodiments of the invention. Thus, if such modifications and variations of the embodiments of the present invention fall within the scope of the claims of the embodiments of the present invention and their equivalents, the embodiments of the present invention are also intended to encompass such modifications and variations.
Claims (10)
1. A method for producing an ultrahigh nitrogen tin plate is characterized by comprising the following steps:
smelting molten iron to obtain molten steel;
refining the molten steel, blowing nitrogen in the refining, vacuumizing until the vacuum degree is controlled to be 2-15 KPa, adding a nitrogen-containing alloy for alloying, and breaking the air after circulation to obtain refined molten steel;
and (3) after the refined molten steel is calmed, carrying out continuous casting to obtain a tin plate casting blank with the nitrogen content being more than or equal to 150 ppm.
2. The method for producing an ultra-high nitrogen tin plate according to claim 1, wherein the nitrogen blowing amount is 20 to 150ppm in ppm concentration when the degree of vacuum is controlled to 2 to 15 KPa; and the nitrogen blowing time t is delta N/v, wherein delta N is the nitrogen blowing amount of the steel, and v is the nitrogen increasing rate of the molten steel.
3. The method of claim 1, wherein the nitrogen-containing alloy comprises one of nitrogen-containing ferrochrome, nitrogen-containing ferromanganese, nitrogen-containing ferrovanadium, and nitrogen-containing ferrosilicon.
4. The method for producing an ultra-high nitrogen tin plate according to claim 1, wherein the nitrogen-containing alloy is added in an amount of: (target value of N element-N element content before adding the nitrogen-containing alloy) x molten steel amount/(yield of the nitrogen-containing alloy x N element content in the nitrogen-containing alloy).
5. The method for producing an ultra-high nitrogen tin plate as claimed in claim 1, wherein the temperature of the air break is controlled to 1570-1600 ℃.
6. The method for producing an ultrahigh nitrogen tin-plated plate according to claim 1, wherein the calming time is 10 to 50 min.
7. The method for producing an ultrahigh nitrogen tin plate according to claim 1, wherein in the smelting treatment, oxygen is blown by a converter and then nitrogen is blown by an oxygen lance, and the oxygen lance blows nitrogenThe time is controlled to be 0.5-5 min, and the nitrogen blowing amount of the oxygen lance is controlled to be 0.2-0.8 Nm3The steel is treated by the method, wherein the lance position of the oxygen lance is controlled to be 1.4-2.0 m; the nitrogen flow of the oxygen lance is 3000-7000 Nm3/h。
8. The method for producing an ultrahigh nitrogen tin plate according to claim 1, wherein nitrogen is bottom-blown in the whole smelting process, and when the nitrogen bottom-blown amount is 50 to 70 percent of the total oxygen blown amount, the nitrogen bottom-blown amount is adjusted to 1000 to 5000Nm3/h。
9. The method for producing an ultrahigh nitrogen tin-plated plate as recited in claim 1, wherein in said smelting treatment, the temperature of the end point of smelting is controlled to 1670 ℃ to 1700 ℃.
10. The method for producing the ultrahigh-nitrogen tin plate as recited in claim 1, wherein the mass fraction of C in the low-carbon high-nitrogen molten steel is not more than 0.06%, and the mass fraction of N is not less than 50 ppm.
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| CN117587330A (en) * | 2024-01-19 | 2024-02-23 | 江苏省沙钢钢铁研究院有限公司 | High-nitrogen high-purity tinplate and production method thereof |
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