CN115198189B - Method for shortening smelting time of producing duplex stainless steel by AOD furnace - Google Patents
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- 238000003723 Smelting Methods 0.000 title claims abstract description 33
- 229910001039 duplex stainless steel Inorganic materials 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000004904 shortening Methods 0.000 title claims description 12
- 238000007664 blowing Methods 0.000 claims abstract description 74
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 72
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 66
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 59
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 59
- 239000001301 oxygen Substances 0.000 claims abstract description 59
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 50
- 239000010959 steel Substances 0.000 claims abstract description 50
- 229910052786 argon Inorganic materials 0.000 claims abstract description 36
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 34
- 238000005261 decarburization Methods 0.000 claims abstract description 23
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 18
- 238000005275 alloying Methods 0.000 claims abstract description 11
- 238000004886 process control Methods 0.000 claims abstract description 9
- 239000000203 mixture Substances 0.000 claims abstract description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 12
- 238000005070 sampling Methods 0.000 claims description 11
- 229910000519 Ferrosilicon Inorganic materials 0.000 claims description 6
- 229910052748 manganese Inorganic materials 0.000 claims description 6
- 239000012535 impurity Substances 0.000 claims description 5
- 239000000126 substance Substances 0.000 claims description 5
- 230000003247 decreasing effect Effects 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 14
- 238000004458 analytical method Methods 0.000 description 10
- 239000011651 chromium Substances 0.000 description 10
- 238000010079 rubber tapping Methods 0.000 description 5
- 229910052804 chromium Inorganic materials 0.000 description 4
- 229910001873 dinitrogen Inorganic materials 0.000 description 4
- 239000002893 slag Substances 0.000 description 4
- 238000003756 stirring Methods 0.000 description 4
- 238000009529 body temperature measurement Methods 0.000 description 3
- 229910052750 molybdenum Inorganic materials 0.000 description 3
- 229910052759 nickel Inorganic materials 0.000 description 3
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000006477 desulfuration reaction Methods 0.000 description 2
- 230000023556 desulfurization Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 229910000604 Ferrochrome Inorganic materials 0.000 description 1
- 229910000616 Ferromanganese Inorganic materials 0.000 description 1
- 229910001309 Ferromolybdenum Inorganic materials 0.000 description 1
- 229910000863 Ferronickel Inorganic materials 0.000 description 1
- 241001062472 Stokellia anisodon Species 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910000963 austenitic stainless steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010612 desalination reaction Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
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- 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
- 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
- C21C5/005—Manufacture of stainless steel
-
- 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
- C21C7/068—Decarburising
- C21C7/0685—Decarburising of stainless steel
-
- 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
- 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
- C22C38/04—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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
-
- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
Abstract
The invention relates to an AOD smelting method of duplex stainless steel 2205, which shortens the smelting time of producing duplex stainless steel by an AOD furnace and comprises the following steps: step one: controlling the composition C, cr, si, mn of molten steel entering the furnace; step two: oxygen blowing decarburization process control; step three: and (3) controlling nitrogen alloying process of argon blowing and nitrogen removal. The smelting of the duplex stainless steel 2205 can shorten the AOD smelting time by more than 55 minutes, improve the production efficiency and reduce the production cost.
Description
Technical Field
The invention relates to an AOD smelting method of duplex stainless steel 2205, in particular to a method for shortening smelting time of producing duplex stainless steel 2205 by an AOD furnace.
Background
2205 is the most predominant steel grade of duplex stainless steel. Compared with austenitic stainless steel of the same grade, the material has high strength, good stress corrosion resistance, spot corrosion resistance and welding performance while greatly reducing the Ni content, and can be widely applied to industries such as petrochemical industry, shipbuilding, sea water desalination and the like.
But the duplex stainless steel 2205 belongs to ultra-low carbon stainless steel, and meanwhile, the chromium content in the steel is high, so that decarburization is difficult; in addition, the content of nitrogen in the duplex stainless steel 2205 is higher, and the difficulty of accurately controlling the content of nitrogen is high, so that the smelting time of the duplex stainless steel 2205 in an AOD furnace is long, and the production cost and the production efficiency are affected due to the fact that one furnace steel is usually longer than 170 minutes.
The method for shortening the smelting time of producing the duplex stainless steel 2205 by the AOD furnace mainly optimizes the proportion of raw materials fed into the furnace by the AOD furnace, optimizes the AOD decarburization, and precisely controls the measure of nitrogen content in the steel, shortens the time of smelting the duplex stainless steel 2205 by the AOD furnace, and improves the AOD production efficiency.
Disclosure of Invention
The invention aims at solving the problems and provides a method for shortening smelting time of producing duplex stainless steel by an AOD furnace.
The purpose of the invention is realized in the following way: a method for shortening smelting time of producing duplex stainless steel by an AOD furnace comprises the following chemical components in percentage by mass: c: less than or equal to 0.03 percent, si: less than or equal to 1.00 percent, mn: less than or equal to 2.00 percent, P: less than or equal to 0.030 percent, S: less than or equal to 0.020%, cr:21.0% -23.0%, ni:4.5% -6.5%, mo:2.50% -3.50%, N:0.08% -0.20% and the balance of Fe and unavoidable impurities.
A method for shortening smelting time of producing duplex stainless steel 2205 by an AOD furnace, which comprises the following steps: step one: control of the composition C, cr, si, mn of the molten steel charged into the furnace: the control range of the content of C is as follows: 1.5% -2.5%, the Cr content control range is: 22% -25%, the Si and Mn content control range is: si is less than or equal to 0.2 percent, mn is less than or equal to 0.2 percent; step two: oxygen blowing decarburization process control: the carbon content in the steel is 0.30-2.50%, top-bottom re-blowing oxygen is adopted for decarburization, and the top-blowing oxygen flow is 2800-3200m 3 And/h, the bottom blowing oxygen flow is 800-1200m 3 And the top-blown oxygen flow is from large to small, and the low-blown oxygen flow is from small to large; stopping top-blown oxygen when the carbon content in the steel is below 0.30%, decarburizing by adopting bottom-blown oxygen, wherein the bottom-blown oxygen supply is from 1200m 3 Gradually decreasing/h to 500m 3 /h-300m 3 And (h) when the carbon content in the steel is less than 0.02%, sampling and analyzing the C content, and when the oxygen content in the sampling and analyzing is less than 0.02%, stopping oxygen blowing, and adding ferrosilicon for reduction; step three: and (3) nitrogen alloying process control of argon blowing and nitrogen removal: when the temperature of molten steel reaches 1580-1680 ℃, argon blowing and nitrogen removal are performed by bottom argon blowing, wherein the argon blowing amount is 4.0-4.4 cubic meters per ton of steel, the argon blowing amount is controlled according to the lower limit when the temperature of molten steel is at the upper limit, and the argon blowing amount is controlled according to the upper limit when the temperature of molten steel is at the lower limit, so that the argon blowing amount is required to be completed once.
The beneficial effects of the invention are as follows: the smelting of the duplex stainless steel 2205 can shorten the AOD smelting time by more than 55 minutes, improve the production efficiency and reduce the production cost.
Detailed Description
The duplex stainless steel 2205 belongs to ultra-low carbon stainless steel, and has high chromium content in the steel, difficult decarburization, high nitrogen content in the steel and low hit rate. The invention provides a method for shortening smelting time of producing duplex stainless steel 2205 by an AOD furnace.
The concept of the invention is to analyze the reasons that the duplex stainless steel 2205 is difficult to decarbonize and the hit rate of nitrogen content is low, and to adopt a reasonable AOD smelting process, so that the smelting time of 2205 is shortened from more than 170 minutes to less than 115 minutes, and the AOD production efficiency is improved.
The duplex stainless steel 2205 comprises the following chemical components in percentage by mass:
c is less than or equal to 0.03 percent Si is less than or equal to 1.00 percent Mn is less than or equal to 2.00 percent P is less than or equal to 0.030 percent S is less than or equal to 0.020 percent Cr:21.0% -23.0% Ni:4.5 to 6.5 percent of Mo, 2.50 to 3.50 percent of N, 0.08 to 0.20 percent of Fe and unavoidable impurities.
The AOD equipment of the invention has the basic parameters that:
the smelting control method of the duplex stainless steel 2205 comprises the following steps:
control of I-charging molten steel composition C, cr, si, mn
The control range of the content of C is as follows: 1.5% -2.5%. The higher the C content is controlled, the longer the decarburization time is, the lower the C content is controlled, the insufficient heat is generated by oxygen blowing decarburization, and the temperature of molten steel is affected during decarburization, thereby affecting the decarburization time and slagging and desulfurization. Through multiple rounds of experiments, the carbon content range of AOD smelting 2205 is finally determined to be 1.5% -2.5%.
The control range of Cr content is as follows: 22% -25%. The Cr content in the standard required steel is 21% -23%, but in order to reduce the cost, ferronickel, ferromolybdenum, ferromanganese, ferrosilicon and high-carbon ferrochrome are added in the AOD smelting process, so that the Cr content in the furnace is diluted, and the Cr content in the furnace is controlled to be 22% -25% by a plurality of tests, so that the smelting time can be shortened on the premise of not affecting the cost.
The control range of Si and Mn content is: si is less than or equal to 0.2 percent and Mn is less than or equal to 0.2 percent. Si and Mn are oxidized firstly during oxygen blowing decarburization to form a large amount of slag, so that the decarburization speed is influenced, and a large amount of SiO is formed simultaneously 2 Severely affecting desulfurization. A plurality of tests prove that Si is less than or equal to 0.2 percent and Mn is less than or equal to 0.2 percent when the furnace is charged.
II oxygen blowing decarburization process control
The carbon content in the steel is above 0.30%, and top-bottom re-blowing oxygen is adopted for decarburization. The top-blown oxygen flow is 2800-3200m 3 And/h, the bottom blowing oxygen flow is 800-1200m 3 And the top-blown oxygen flow is from large to small, and the low-blown oxygen flow is from small to large. C content is analyzed according to secondary calculation and sampling, when the carbon content in steel is below 0.30%, top-blown oxygen is stopped, bottom-blown oxygen decarburization is adopted, and the bottom-blown oxygen supply is from 1200m 3 Gradually decreasing/h to 500m 3 /h-300m 3 And/h, when the C content is less than 0.02% in the secondary calculation, sampling and analyzing the C content, and when the C content is less than 0.02% in the sampling and analyzing the oxygen content, stopping oxygen blowing, and adding ferrosilicon for reduction.
III argon blowing nitrogen removal nitrogen alloying process control
The molten steel is smelted from AOD to finish reduction, slag skimming and component adjustment, nitrogen gas stirring and nitrogen alloying are performed in the whole process, temperature measurement is performed after component adjustment, nitrogen gas stirring is continued at the moment when the temperature of the molten steel is 1580-1680 ℃, argon blowing and nitrogen removal are performed by bottom argon blowing at the moment when the temperature of the molten steel reaches 1580-1680 ℃, the argon blowing amount is 4.0-4.4 cubic meters per ton of steel, the argon blowing amount is controlled according to the lower limit when the temperature of the molten steel is at the upper limit, the argon blowing amount is controlled according to the upper limit when the temperature of the molten steel is at the lower limit, and the argon blowing amount is required to be finished at one time. Tapping immediately after argon blowing, wherein the hit rate of the finished product nitrogen content in the steel reaches 100% and is 0.14% -0.18%.
According to the invention, 45 tons of AOD furnace are adopted to smelt the duplex stainless steel 2205, and the average time of smelting the duplex stainless steel 2205 in the AOD furnace is reduced from 170 minutes to 115 minutes at present by controlling the components of molten steel C, cr, si, mn fed into the furnace and adopting an oxygen blowing decarburization process technology and an argon blowing and nitrogen removing nitrogen alloying process technology, so that the production efficiency is greatly improved and the production cost is reduced.
Specific embodiments of 45 ton AOD smelted duplex stainless steel are described in detail below with reference to examples, but the specific embodiments of the present invention are not limited to the examples described below.
Example 1
The duplex stainless steel of this example 2205, an example of shortening the production time of AOD smelting 2205, comprises the following sequential steps:
main chemical composition (in mass%) of AOD furnace 2205
C:2.1% Si:0.15% Mn:0.03% P:0.025% S:0.02% Cr:23.5% Ni:5.3 percent of Mo, 3.2 percent of Fe and unavoidable impurities in balance.
II concrete control of oxygen blowing decarburization process
After the AOD molten steel is added, top and bottom simultaneous oxygen blowing decarburization is adopted, and the top oxygen blowing flow is 3200m 3 And/h, the bottom blowing oxygen flow is 600m 3 /h。
Top-blown oxygen flow rates of 3200m respectively 3 /h、3000m 3 /h、2700m 3 And (3) carrying out sampling analysis on the C content after the corresponding time is respectively 10min, 8min and 6min and the C content is calculated to be 0.28%, and continuing oxygen blowing in the analysis process, wherein the C content analysis result is 0.26%. Stopping top blowing, decarbonizing with bottom blowing oxygen with oxygen supply of 600m 3 /h、800m 3 /h、1000m 3 And (3) carrying out sampling analysis on the C content after the corresponding time is 12min, 15min and 20min, continuing oxygen blowing in the analysis process, stopping oxygen blowing when the C content is 0.012%, and adding 1.3 tons of ferrosilicon for reduction.
III argon blowing nitrogen removal nitrogen alloying process control
After the molten steel is reduced by AOD, slag skimming and component adjustment are carried out, nitrogen gas stirring and nitrogen alloying are carried out in the whole process, temperature measurement is carried out after component adjustment is completed, the temperature of the molten steel is 1635 ℃, argon blowing and nitrogen removal are carried out by bottom argon blowing, the argon blowing amount is 4.2 cubic meters per ton of steel, and the argon blowing amount is completed once. Tapping immediately after argon blowing, wherein the nitrogen content of a finished product in the steel is 0.156%, and the control target is 0.14% -0.18%.
The total smelting time from the steel adding to tapping is 110min.
Example two
The duplex stainless steel of this example 2205, an example of shortening the production time of AOD smelting 2205, comprises the following sequential steps:
main chemical composition (in mass%) of AOD furnace 2205
C:2.45% Si:0.10% Mn:0.1003% P:0.022% S:0.03% Cr:23.0% Ni:5.15% Mo 3.1%, and the balance of Fe and unavoidable impurities.
II concrete control of oxygen blowing decarburization process
After the AOD molten steel is added, top and bottom simultaneous oxygen blowing decarburization is adopted, and the top oxygen blowing flow is 3200m 3 And/h, the bottom blowing oxygen flow is 600m 3 /h。
Top-blown oxygen flow rates of 3200m respectively 3 /h、2900m 3 /h、2600m 3 And (3) carrying out sampling analysis on the C content after the corresponding time is respectively 10min, 10min and 6min and the C content is calculated to be 0.30%, and continuing oxygen blowing in the analysis process, wherein the C content analysis result is 0.28%. Stopping top blowing, decarbonizing with bottom blowing oxygen with oxygen supply of 650m 3 /h、850m 3 /h、1000m 3 And (3) carrying out sampling analysis on the C content after the corresponding time is 12min, 16min and 18min, continuing oxygen blowing in the analysis process, stopping oxygen blowing when the C content is 0.010%, and adding 1.5 tons of ferrosilicon for reduction.
III argon blowing nitrogen removal nitrogen alloying process control
After the molten steel is reduced by AOD, slag skimming and component adjustment are carried out, nitrogen gas stirring and nitrogen alloying are carried out in the whole process, temperature measurement is carried out after component adjustment is completed, the temperature of the molten steel is 1660 ℃, argon blowing and nitrogen removal are carried out by bottom argon blowing, the argon blowing amount is 4.1 cubic meters per ton of steel, and the argon blowing amount is completed once. Tapping immediately after argon blowing, wherein the nitrogen content of a finished product in the steel is 0.152%, and the control target is 0.14% -0.18%.
The total smelting time from the steel adding to tapping was 113min.
According to the technical scheme, the time for smelting the duplex stainless steel 2205 by the AOD furnace is reduced from 170 minutes to 115 minutes at present by controlling the temperature of molten steel entering the furnace, the carbon content and the main alloy content of the molten steel entering the furnace, the oxygen blowing amount and oxygen blowing distribution in the decarburization process and nitrogen alloying process measures, so that the production efficiency is greatly improved. The invention can shorten the time for smelting the duplex stainless steel 2205 by an AOD furnace. Greatly improves the production efficiency.
The above embodiments are merely examples of the present invention, but the present invention is not limited to the above embodiments, and any changes or modifications within the scope of the present invention are intended to be included in the scope of the present invention.
Claims (1)
1. A method for shortening smelting time of producing duplex stainless steel by an AOD furnace is characterized by comprising the following steps: the duplex stainless steel 2205 comprises the following chemical components in percentage by mass: c: less than or equal to 0.03 percent, si: less than or equal to 1.00 percent, mn: less than or equal to 2.00 percent, P: less than or equal to 0.030 percent, S: less than or equal to 0.020%, cr:21.0% -23.0%, ni:4.5% -6.5%, mo:2.50% -3.50%, N:0.08% -0.20%, and the balance of Fe and unavoidable impurities;
a method for shortening smelting time of producing duplex stainless steel by an AOD furnace comprises the following steps:
step one: control of the composition C, cr, si, mn of the molten steel charged into the furnace: the control range of the content of C is as follows: 1.5% -2.5%, the Cr content control range is: 22% -25%, the Si and Mn content control range is: si is less than or equal to 0.2 percent, mn is less than or equal to 0.2 percent;
step two: oxygen blowing decarburization process control: the carbon content in the steel is 0.30-2.50%, top-bottom re-blowing oxygen is adopted for decarburization, and the top-blowing oxygen flow is 2800-3200m 3 And/h, the bottom blowing oxygen flow is 800-1200m 3 And the top-blown oxygen flow is from large to small, and the low-blown oxygen flow is from small to large; stopping top-blown oxygen when the carbon content in the steel is below 0.30%, decarburizing by adopting bottom-blown oxygen, wherein the bottom-blown oxygen supply is from 1200m 3 Gradually decreasing/h to 500m 3 /h-300m 3 And (h) when the carbon content in the steel is less than 0.02%, sampling and analyzing the C content, and when the oxygen content in the sampling and analyzing is less than 0.02%, stopping oxygen blowing, and adding ferrosilicon for reduction;
step three: and (3) nitrogen alloying process control of argon blowing and nitrogen removal: when the temperature of molten steel reaches 1580-1680 ℃, argon blowing and nitrogen removal are performed by bottom argon blowing, wherein the argon blowing amount is 4.0-4.4 cubic meters per ton of steel, the argon blowing amount is controlled according to the lower limit when the temperature of molten steel is at the upper limit, the argon blowing amount is controlled according to the upper limit when the temperature of molten steel is at the lower limit, and the argon blowing amount is required to be completed once;
the smelting time of the duplex stainless steel 2205 is shortened to be less than 115 minutes.
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1563463A (en) * | 2004-03-23 | 2005-01-12 | 宝钢集团上海五钢有限公司 | Manufactring method for smelting stainless steel containing N biphase |
| CN101671763A (en) * | 2009-10-13 | 2010-03-17 | 山西太钢不锈钢股份有限公司 | Method for increasing nitrogen for smelting high nitrogen stainless steel in argon oxygen decarburizing furnace |
| CN101876024A (en) * | 2009-04-30 | 2010-11-03 | 宝山钢铁股份有限公司 | Production method for high-chrome continuous cast billet containing N duplex stainless steel of pipe blank |
| CN102191357A (en) * | 2010-03-01 | 2011-09-21 | 长春工业大学 | Method and improved device for argonoxygen refining of low-carbon ferrochrome |
| CN106834608A (en) * | 2017-02-16 | 2017-06-13 | 山西太钢不锈钢股份有限公司 | A kind of AOD furnace CO2The method for substituting part argon gas smelting stainless steel |
| CN108642365A (en) * | 2018-05-22 | 2018-10-12 | 兰州兰石集团有限公司 | Accurately control the high-purity two phase stainless steel smelting process of N content |
| CN110541060A (en) * | 2019-10-08 | 2019-12-06 | 安徽富凯特材有限公司 | Nitrogen control method for stainless steel AOD smelting |
-
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- 2022-07-19 CN CN202210847207.7A patent/CN115198189B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1563463A (en) * | 2004-03-23 | 2005-01-12 | 宝钢集团上海五钢有限公司 | Manufactring method for smelting stainless steel containing N biphase |
| CN101876024A (en) * | 2009-04-30 | 2010-11-03 | 宝山钢铁股份有限公司 | Production method for high-chrome continuous cast billet containing N duplex stainless steel of pipe blank |
| CN101671763A (en) * | 2009-10-13 | 2010-03-17 | 山西太钢不锈钢股份有限公司 | Method for increasing nitrogen for smelting high nitrogen stainless steel in argon oxygen decarburizing furnace |
| CN102191357A (en) * | 2010-03-01 | 2011-09-21 | 长春工业大学 | Method and improved device for argonoxygen refining of low-carbon ferrochrome |
| CN106834608A (en) * | 2017-02-16 | 2017-06-13 | 山西太钢不锈钢股份有限公司 | A kind of AOD furnace CO2The method for substituting part argon gas smelting stainless steel |
| CN108642365A (en) * | 2018-05-22 | 2018-10-12 | 兰州兰石集团有限公司 | Accurately control the high-purity two phase stainless steel smelting process of N content |
| CN110541060A (en) * | 2019-10-08 | 2019-12-06 | 安徽富凯特材有限公司 | Nitrogen control method for stainless steel AOD smelting |
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