CN103469104B - A kind of boracic duplex stainless steel and boron alloyed smelting process thereof - Google Patents
A kind of boracic duplex stainless steel and boron alloyed smelting process thereof Download PDFInfo
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- 229910052796 boron Inorganic materials 0.000 title claims abstract description 103
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 title claims abstract description 68
- 229910001039 duplex stainless steel Inorganic materials 0.000 title claims abstract description 48
- 238000000034 method Methods 0.000 title claims abstract description 36
- 238000003723 Smelting Methods 0.000 title claims abstract description 19
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 181
- 239000010959 steel Substances 0.000 claims abstract description 181
- 239000002893 slag Substances 0.000 claims abstract description 73
- 239000000203 mixture Substances 0.000 claims abstract description 60
- 229910021538 borax Inorganic materials 0.000 claims abstract description 46
- 239000004328 sodium tetraborate Substances 0.000 claims abstract description 46
- 235000010339 sodium tetraborate Nutrition 0.000 claims abstract description 46
- 239000000126 substance Substances 0.000 claims abstract description 46
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 43
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 43
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 39
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 36
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 36
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 36
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 28
- 238000007670 refining Methods 0.000 claims abstract description 28
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 23
- 238000009749 continuous casting Methods 0.000 claims abstract description 17
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 15
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 15
- 239000001301 oxygen Substances 0.000 claims abstract description 15
- 238000010079 rubber tapping Methods 0.000 claims abstract description 13
- 239000000463 material Substances 0.000 claims abstract description 10
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 96
- 229910052782 aluminium Inorganic materials 0.000 claims description 59
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 52
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 50
- 229910052786 argon Inorganic materials 0.000 claims description 48
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 43
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 31
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 31
- 239000004571 lime Substances 0.000 claims description 31
- 238000007664 blowing Methods 0.000 claims description 22
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims description 22
- OSMSIOKMMFKNIL-UHFFFAOYSA-N calcium;silicon Chemical compound [Ca]=[Si] OSMSIOKMMFKNIL-UHFFFAOYSA-N 0.000 claims description 22
- 239000010436 fluorite Substances 0.000 claims description 22
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 20
- 238000003756 stirring Methods 0.000 claims description 19
- 229910000519 Ferrosilicon Inorganic materials 0.000 claims description 17
- 229910000720 Silicomanganese Inorganic materials 0.000 claims description 17
- 229910052742 iron Inorganic materials 0.000 claims description 17
- 229910000604 Ferrochrome Inorganic materials 0.000 claims description 14
- 238000005261 decarburization Methods 0.000 claims description 14
- 230000000694 effects Effects 0.000 claims description 11
- 108010038629 Molybdoferredoxin Proteins 0.000 claims description 8
- HBELESVMOSDEOV-UHFFFAOYSA-N [Fe].[Mo] Chemical compound [Fe].[Mo] HBELESVMOSDEOV-UHFFFAOYSA-N 0.000 claims description 8
- 238000006243 chemical reaction Methods 0.000 claims description 8
- 238000009792 diffusion process Methods 0.000 claims description 8
- 239000007789 gas Substances 0.000 claims description 8
- 239000010439 graphite Substances 0.000 claims description 8
- 229910002804 graphite Inorganic materials 0.000 claims description 8
- 238000009533 lab test Methods 0.000 claims description 8
- 239000007788 liquid Substances 0.000 claims description 8
- 239000000155 melt Substances 0.000 claims description 8
- 238000005070 sampling Methods 0.000 claims description 8
- 229910052799 carbon Inorganic materials 0.000 abstract description 19
- 238000004519 manufacturing process Methods 0.000 abstract description 9
- 230000002378 acidificating effect Effects 0.000 abstract description 8
- 239000003795 chemical substances by application Substances 0.000 abstract description 5
- 230000004048 modification Effects 0.000 abstract description 5
- 238000012986 modification Methods 0.000 abstract description 5
- 238000005275 alloying Methods 0.000 abstract description 3
- 241000209094 Oryza Species 0.000 description 12
- 235000007164 Oryza sativa Nutrition 0.000 description 12
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- 239000004411 aluminium Substances 0.000 description 9
- 239000013078 crystal Substances 0.000 description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 6
- 238000006477 desulfuration reaction Methods 0.000 description 6
- 230000023556 desulfurization Effects 0.000 description 6
- 238000001514 detection method Methods 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 239000002994 raw material Substances 0.000 description 4
- 229910001220 stainless steel Inorganic materials 0.000 description 4
- 239000010935 stainless steel Substances 0.000 description 4
- 229910004261 CaF 2 Inorganic materials 0.000 description 3
- 208000037656 Respiratory Sounds Diseases 0.000 description 3
- 229910004298 SiO 2 Inorganic materials 0.000 description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 3
- 239000005864 Sulphur Substances 0.000 description 3
- 230000002308 calcification Effects 0.000 description 3
- 229910052791 calcium Inorganic materials 0.000 description 3
- 239000011575 calcium Substances 0.000 description 3
- 229910052681 coesite Inorganic materials 0.000 description 3
- 229910052906 cristobalite Inorganic materials 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- UQGFMSUEHSUPRD-UHFFFAOYSA-N disodium;3,7-dioxido-2,4,6,8,9-pentaoxa-1,3,5,7-tetraborabicyclo[3.3.1]nonane Chemical compound [Na+].[Na+].O1B([O-])OB2OB([O-])OB1O2 UQGFMSUEHSUPRD-UHFFFAOYSA-N 0.000 description 3
- 238000007667 floating Methods 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 239000000377 silicon dioxide Substances 0.000 description 3
- 235000012239 silicon dioxide Nutrition 0.000 description 3
- 239000011734 sodium Substances 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 238000004611 spectroscopical analysis Methods 0.000 description 3
- 229910052682 stishovite Inorganic materials 0.000 description 3
- 229910052905 tridymite Inorganic materials 0.000 description 3
- 238000007796 conventional method Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
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- 238000010899 nucleation Methods 0.000 description 1
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- 238000007254 oxidation reaction Methods 0.000 description 1
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- 238000005204 segregation Methods 0.000 description 1
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- 230000008023 solidification Effects 0.000 description 1
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- 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
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Abstract
The invention discloses a kind of boracic duplex stainless steel and smelting process thereof, boracic duplex stainless steel, according to the chemical composition of mass percent be, C:0.018 ~ 0.025%, Si:0.48 ~ 0.54%, Mn:1.15 ~ 1.20%, P≤0.025%, S≤0.0005%, Cr:22.20 ~ 22.30%, Ni:5.20 ~ 5.25%, Mo:3.08 ~ 3.12%, N:0.174 ~ 0.184%, B:0.0028 ~ 0.0035%, other is Fe and relict element.The boron alloyed smelting process of described boracic duplex stainless steel, skims after comprising AOD refining, AOD tapping, LF refining and continuous casting, in LF refining process, add borax.This smelting process, adds borax under the prerequisite reducing entire oxygen content in the steel content, ensures the acid-soluble boron that stable acquisition is appropriate.The borax added is for containing acidic oxide B
2o
3slag former, borax wide material sources, low price.Production technique is simple and easy, and borax is except as the modification agent of slag, can also complete the alloying of boron.
Description
Technical field
The invention belongs to stainless steel smelting technical field, particularly relate to a kind of boracic duplex stainless steel and boron alloyed smelting process thereof.
Background technology
Boron is the interstitial atom that atomic radius is very little, and boron, in the segregation of duplex stainless steel crystal boundary, can improve the intensity of crystal boundary, improves hot workability.In addition, adding of boron can provide more nucleation site in molten steel solidification process, thus improves the equiaxial crystal ratio of two-phase stainless plate slab.But too much boron adds, easily form the precipitated phase of low melting point at crystal boundary, worsen hot workability.Therefore, in the process of producing duplex stainless steel, it is useful for adding the hot workability of appropriate B to steel.
When adopting AOD converter smelting → LF refinery practice to produce duplex stainless steel, conventional method in AOD tapping process or LF refining process, adds ferro-boron or boron line to complete the alloying of boron.
Patent " a kind of duplex stainless steel and manufacture method thereof " (patent No. ZL200810079771.9, publication number CN101403077, day for announcing 2009.04.08) disclose a kind of duplex stainless steel and manufacture method thereof, when AOD taps, molten steel is poured in baked ladle, when tap reaches 1/3 of total molten steel amount, disposablely in ladle, add ferro-boron 0.4 ~ 0.5kg/t.
Patent " a kind of duplex stainless steel and manufacture method thereof " (patent No. ZL200910046646.2, notification number CN101812647A, day for announcing 2010.08.25) disclose a kind of duplex stainless steel and manufacture method thereof, in ladle or crystallizer, the B of 0 ~ 0.003% is added in the mode of feeding silk.
The technique of existing boron alloyed smelting boracic duplex stainless steel, deficiency be ferro-boron and boron line cost higher, simultaneously complicated operation in the process that adds at ladle or crystallizer of ferro-boron line, easy broken string, in addition the total oxygen content in steel directly affects the rate of recovery of boron, the oxidation that oxygen causes [B], reduces the content of acid-soluble boron in molten steel.Therefore, the method for the boron alloyed smelting boracic duplex stainless steel that exploitation is a kind of easily, raw material sources is extensive, production cost is low, Boron contents is stable is necessary.
Summary of the invention
The object of the present invention is to provide a kind of boracic duplex stainless steel.
For achieving the above object, the technical scheme that the present invention takes is:
A kind of boracic duplex stainless steel, according to mass percent, chemical composition is, C:0.018 ~ 0.025%, Si:0.48 ~ 0.54%, Mn:1.15 ~ 1.20%, P≤0.025%, S≤0.0005%, Cr:22.20 ~ 22.30%, Ni:5.20 ~ 5.25%, Mo:3.08 ~ 3.12%, N:0.174 ~ 0.184%, B:0.0028 ~ 0.0035%, other is Fe and relict element.
According to mass percent, the chemical composition of described boracic duplex stainless steel is, C:0.018%, Si:0.48%, Mn:1.18%, P:0.025%, S:0.0003%, Cr:22.27%, Ni:5.25%, Mo:3.10%, N:0.184%, B:0.0035%, other is Fe and relict element.
According to mass percent, the chemical composition of described boracic duplex stainless steel is, C:0.025%, Si:0.50%, Mn:1.15%, P:0.022%, S:0.0005%, Cr:22.30%, Ni:5.20%, Mo:3.12%, N:0.178%, B:0.0028%, other is Fe and relict element.
According to mass percent, the chemical composition of described boracic duplex stainless steel is, C:0.020%, Si:0.54%, Mn:1.20%, P:0.024%, S:0.0004%, Cr:22.20%, Ni:5.24%, Mo:3.08%, N:0.174%, B:0.0030%, other is Fe and relict element.
Another object of the present invention be to provide technique simple, be easy to operate and control, the boron alloyed smelting process of production cost is low, Boron contents is stable a kind of boracic duplex stainless steel.
For achieving the above object, the technical scheme that the present invention takes is:
The boron alloyed smelting process of described boracic duplex stainless steel, comprises the following steps:
Step one, AOD refining: at 1500 ~ 1540 DEG C, according to mass percent, by chemical composition be: C:1.70 ~ 2.20%, Si:0.10 ~ 0.26%, Mn:0.25 ~ 0.35%, P≤0.024%, S≤0.03%, Cr:17.80 ~ 18.20%, Ni:5.00 ~ 5.40%, B:0.0004 ~ 0.0006%, other molten iron for Fe and relict element is injected in AOD furnace, carries out decarburization, reduction, desulphurization reaction;
Step 2, skims after AOD tapping: pour baked ladle at 1650 DEG C ~ 1700 DEG C from AOD furnace by molten steel, ladle baking to 700 ~ 900 DEG C; Ladle is transported to station of skimming, carries out taking off Slag treatment, staying quantity of slag slag thick is 150 ~ 200mm;
Step 3, LF refining: ladle is transported to LF stove and carry out refining, inlet temperature is 1580 DEG C ~ 1600 DEG C; Carry out Argon operation after entering the station, argon flow amount controls at 300 ~ 500NL/min;
1. feed total oxygen content≤0.002% in aluminum steel adjustment molten steel, aluminum steel feed quantity is 1.0 ~ 1.5 meters/t molten steel;
2. slag material is added: aluminum shot, lime and fluorite, add borax simultaneously; Aluminum shot add-on is 0.2 ~ 0.3kg/t molten steel, and lime adding amount is 5.0 ~ 7.0kg/t molten steel, and fluorite add-on is 3.0 ~ 5.0kg/t molten steel, and borax add-on is 0.694kg ~ 0.844kg/t molten steel;
3. adopt the energization slag of Graphite Electrodes, after slag charge melts completely, use strong bottom blowing stirring 10 ~ 20 minutes, argon flow amount controls at 700 ~ 800NL/min; Under the effect that argon gas stirs, boron enters into molten steel by diffusion from slag, exists with the form of acid-soluble boron;
4. thermometric sampling, according to result of laboratory test, by adding molybdenum-iron, ferrosilicon, silicomanganese, ferrochrome and metallic nickel, Mo, Si, Mn, Cr, Ni composition in adjustment molten steel, adjustment liquid steel temperature is to 1520 ~ 1525 DEG C;
5. feed silicon-calcium wire and carry out Control and Inclusion Removal, silicon-calcium wire feed quantity is 7.0 ~ 8.0 meters/t molten steel; Adjustment argon flow amount, weakly blow 12 ~ 20 minutes, argon bottom-blowing flow is 100 ~ 200 NL/min; The chemical composition obtaining molten steel is, C:0.018 ~ 0.025%, Si:0.48 ~ 0.54%, Mn:1.15 ~ 1.20%, P≤0.025%, S≤0.0005%, Cr:22.20 ~ 22.30%, Ni:5.20 ~ 5.25%, Mo:3.08 ~ 3.12%, N:0.174 ~ 0.184%, B:0.0028 ~ 0.0035%, other is Fe and relict element;
Step 4, continuous casting: molten steel is transported to continuous casting platform and casts, obtains described boracic two-phase stainless product made from steel.
Adopt boracic duplex stainless steel provided by the invention and smelting process thereof, the borax of interpolation is for containing acidic oxide B
2o
3slag former, borax wide material sources, aboundresources, low price; Production technique is simple and easy, and borax, except as the modification agent of slag, can also complete the alloying of boron, can ensure stably to obtain appropriate acid-soluble boron, significantly can reduce fusing point and the viscosity of slag in the smelting of boracic duplex stainless steel.This smelting process, adds borax under the prerequisite reducing entire oxygen content in the steel content, ensures the acid-soluble boron that stable acquisition is appropriate.
Accompanying drawing explanation
Fig. 1 is process flow sheet of the present invention.
Fig. 2 is the metallographic structure photo of the steel grade 2205 duplex stainless steel NO.1 plate that the embodiment of the present invention 1 is produced.
Fig. 3 is the metallographic structure photo of the steel grade 2205 duplex stainless steel NO.1 plate adopting boron line to produce with embodiment 1 the same terms.
Fig. 4 is the metallographic structure photo of the steel grade 2205 duplex stainless steel NO.1 plate that the embodiment of the present invention 2 is produced.
Fig. 5 is the metallographic structure photo of the steel grade 2205 duplex stainless steel NO.1 plate adopting boron line to produce with embodiment 2 the same terms.
Fig. 6 is the metallographic structure photo of the steel grade 2205 duplex stainless steel NO.1 plate that the embodiment of the present invention 3 is produced.
Fig. 7 is the metallographic structure photo of the steel grade 2205 duplex stainless steel NO.1 plate adopting boron line to produce with embodiment 3 the same terms.
Embodiment
Below in conjunction with specific embodiment and accompanying drawing thereof, the present invention is described in further detail, but embodiments of the present invention are not limited thereto.
A kind of boracic duplex stainless steel provided by the invention, according to mass percent, chemical composition is, C:0.018 ~ 0.025%, Si:0.48 ~ 0.54%, Mn:1.15 ~ 1.20%, P≤0.025%, S≤0.0005%, Cr:22.20 ~ 22.30%, Ni:5.20 ~ 5.25%, Mo:3.08 ~ 3.12%, N:0.174 ~ 0.184%, B:0.0028 ~ 0.0035%, other is Fe and relict element.
As shown in Figure 1, be the production scheme of this boracic duplex stainless steel.
Embodiment 1
Steel grade 2205 duplex stainless steel, according to mass percent, its chemical composition is, C:0.018%, Si:0.48%, Mn:1.18%, P:0.025%, S:0.0003%, Cr:22.27%, Ni:5.25%, Mo:3.10%, N:0.184%, B:0.0035%, other is Fe and relict element.
The boron alloyed smelting process of this boracic duplex stainless steel, comprises the following steps:
1.AOD refining: at 1530 DEG C, according to mass percent, by chemical composition be: C:1.70%, Si:0.15%, Mn:0.25%, P:0.024%, S:0.03%, Cr:17.95%, Ni:5.40%, B:0.0005%, other is that the molten iron 92.4 tons of Fe and relict element is injected in AOD furnace, carries out decarburization, reduction, desulphurization reaction.
1. decarburization: top and bottom complex blowing oxygen carries out decarburization, for adding fast response, bottom blowing nitrogen stirs.The lime of 70kg/t molten steel and the high carbon ferro-chrome of 110.2kg/t molten steel is added in carbon rejection process.Add lime 70 × 106.6=7462kg altogether, high carbon ferro-chrome 110.2 × 106.6=11750kg.
When carbon content is less than 0.01%, carry out reducing, the operation of desulfurization.
2. reduce: in AOD furnace, add the ferro-silicon of 16.0kg/t molten steel, the silicomanganese of 16.0kg/t molten steel and the aluminium block of 6.5kg/t molten steel, Cr oxidized in reduced blast furnace
2o
3.At utmost deslagging after this stage terminates.
Add ferro-silicon 16 × 106.6=1705.6kg altogether, silicomanganese 16 × 106.6=1705.6kg, aluminium block 6.5 × 106.6=692.9kg.
Ferrosilicon composition range is, Si:72 ~ 80%, S≤0.030%, P≤0.040%.Silicomanganese composition range is, Si:20 ~ 25%, Mn:60 ~ 65%, P≤0.040%, S≤0.030%.The composition of aluminium block is: 99.5%Al, 0.4%Fe.
3. desulfurization: the lime adding 10.0kg/t molten steel, makes the basicity of slag in AOD converter be 2.3, makes AOD tapping sulphur content be less than 0.001%; Add lime 10 × 106.6=1066Kg altogether.
Skim after 2.AOD tapping: 106.6t molten steel is poured in baked ladle at 1650 DEG C from AOD furnace, ladle baking to 800 DEG C; Ladle is transported to station of skimming, carries out taking off Slag treatment, staying quantity of slag slag thick is 200mm;
3. LF refining: ladle is transported to LF stove and carry out refining, inlet temperature is 1580 DEG C.Carry out Argon operation after entering the station, argon flow amount controls at 500NL/min.
1. feed total oxygen content to 0.0020% in aluminum steel adjustment molten steel, aluminum steel feed quantity is 1.0 meters/t molten steel; 1.0 × 106.6=106.6 rice; Aluminum steel weight is 0.3kg/ rice, and chemical composition is: 98%Al, 0.4%Fe.
2. add slag material: aluminum shot, lime and fluorite, add borax simultaneously, borax is as steel slag modification agent.
Aluminum shot chemical composition is: 98%Al, 0.4%Fe.
Calcification studies and is divided into: CaO >=88.0%, P≤0.01%, S≤0.045%, and C is solid≤and 0.7%, SiO2≤3.0%, activity degree >=350ml, raw burning≤7.0%, granularity: 10 ~ 100mm >=90%.
The chemical composition of fluorite is: CaF
2>=75.0%, SiO
2>=9.0%, P≤0.01%, S≤0.045%, C
gu≤ 0.3%, granularity: 10 ~ 100mm>=90%.
Borax (Na
2b
40
710H
2o) as the boron alloyed raw material of molten steel, chemical constitution is the sodium tetraborate containing 10 water moleculess, 320 DEG C lose whole crystal water, proportion 1.73, containing acidic oxide B in melt
2o
3.The borax added is for containing acidic oxide B
2o
3slag former, significantly can reduce fusing point and the viscosity of slag, be conducive to the floating of inclusion.
Aluminum shot add-on is 0.3kg/t molten steel, and lime adding amount is 7.0kg/t molten steel, and fluorite add-on is 4.0kg/t molten steel, and borax add-on is 0.844kg/t molten steel.
Add aluminum shot 0.3 × 106.6=31.98kg altogether, lime 7.0 × 106.6=746.2kg, fluorite 4.0 × 106.6=426.4kg, borax 0.844 × 106.6=90kg.
3. adopt the energization slag of Graphite Electrodes, after slag charge melts completely, use strong bottom blowing stirring 20 minutes, argon flow amount controls at 800NL/min.Under the effect that argon gas stirs, boron enters into molten steel by diffusion from slag, exists with the form of acid-soluble boron.
4. thermometric sampling, according to result of laboratory test, by adding molybdenum-iron, ferrosilicon, silicomanganese, ferrochrome and metallic nickel, Mo, Si, Mn, Cr, Ni composition in adjustment molten steel, adjustment liquid steel temperature is to 1525 DEG C.
5. feed silicon-calcium wire and carry out Control and Inclusion Removal, silicon-calcium wire feed quantity is 8.0 meters/t molten steel; Silicon-calcium wire weight is 0.25kg/ rice, and chemical composition is, Si:55 ~ 60%, Ca >=28%, P≤0.04%, S≤0.04%; Feeding 8.0 × 106.6=852.8 rice silicon-calcium wire altogether.
Adjustment argon flow amount, weakly blow 20 minutes, argon bottom-blowing flow is 100NL/min; Obtain the satisfactory molten steel of chemical composition.
Get molten steel sample preparation, adopt direct reading spectrometry detection method, according to mass percent, detect that the chemical composition of sample is: C:0.018%, Si:0.48%, Mn:1.18%, P:0.025%, S:0.0003%, Cr:22.27%, Ni:5.25%, Mo:3.10%, N:0.184%, B:0.0035%, other is Fe and relict element.
4. continuous casting: molten steel is transported to continuous casting platform and casts, obtains boracic two-phase stainless product made from steel.
As can be seen from the detection data of direct-reading spectrometer, in product, boron meets target boron content requirement, illustrates that employing borax can reach boron level in the product adopting ferro-boron or boron line to produce.
Fig. 2 is the metallographic structure photo of the steel grade 2205 duplex stainless steel NO.1 plate that the embodiment of the present invention 1 is produced.
Fig. 3 is the metallographic structure photo of the steel grade 2205 duplex stainless steel NO.1 plate adopting boron line to produce with embodiment 1 the same terms.
Comparison diagram 2 and Fig. 3, can find out: in the stainless steel NO.1 sheet metal phase constitution produced with borax and boron line, there is not crackle.
Embodiment 2
Steel grade 2205 duplex stainless steel, according to mass percent, its chemical composition is, C:0.025%, Si:0.50%, Mn:1.15%, P:0.022%, S:0.0005%, Cr:22.30%, Ni:5.20%, Mo:3.12%, N:0.178%, B:0.0028%, other is Fe and relict element.
The boron alloyed smelting process of boracic duplex stainless steel, comprises the following steps:
1. AOD refining: at 1540 DEG C, according to mass percent, by chemical composition be: C:2.20%, Si:0.26%, Mn:0.35%, P:0.018%, S:0.013%, Cr:17.80%, Ni:5.00%, B:0.0004%, other is that 93.5 tons of molten iron of Fe and relict element are injected in AOD furnace, carries out decarburization, reduction, desulphurization reaction.
1. decarburization: top and bottom complex blowing oxygen carries out decarburization, for adding fast response, bottom blowing nitrogen stirs.The lime of 70kg/t molten steel and the high carbon ferro-chrome of 116.6kg/t molten steel is added in carbon rejection process.Add lime 75 × 108.0=8100Kg altogether, high carbon ferro-chrome 116.6 × 108.0=11592.8kg.
When carbon content is less than 0.01%, carry out reducing, the operation of desulfurization.
2. reduce: in AOD furnace, add the ferro-silicon of 13.1kg/t molten steel, the silicomanganese of 14.3kg/t molten steel and the aluminium block of 7.1kg/t molten steel, Cr oxidized in reduced blast furnace
2o
3.At utmost deslagging after this stage terminates.
Add ferro-silicon 13.1 × 108.0=1414.8kg altogether, silicomanganese 14.3 × 108.0=1544.4kg, aluminium block 7.1 × 108.0=766.8kg.
Ferrosilicon composition range is, Si:72 ~ 80%, S≤0.030%, P≤0.040%.Silicomanganese composition range is, Si:20 ~ 25%, Mn:60 ~ 65%, P≤0.040% S≤0.030%.The composition of aluminium block is: 99.5%Al, 0.4%Fe.
3. desulfurization: the lime adding 10.5kg/t molten steel, makes the basicity of slag in AOD converter be 2.3, makes AOD tapping sulphur content be less than 0.001%; Add lime 10.5 × 108.0=1134kg altogether.
Skim after 2.AOD tapping: 108.0t molten steel is poured in baked ladle at 1700 DEG C from AOD furnace, ladle baking to 700 DEG C; Ladle is transported to station of skimming, carries out taking off Slag treatment, staying quantity of slag slag thick is 150mm.
3. LF refining: ladle is transported to LF stove and carry out refining, inlet temperature is 1600 DEG C; Carry out Argon operation after entering the station, argon flow amount controls at 400NL/min.
1. feed aluminum steel adjustment entire oxygen content in the steel content to 0.0015%, aluminum steel feed quantity is 1.5 meters/t molten steel; 1.5 × 108.0=162.0 rice; Aluminum steel weight is 0.3kg/ rice, and chemical composition is: 98%Al, 0.4%Fe.
2. add slag material: aluminum shot, lime and fluorite, add borax simultaneously, borax is as steel slag modification agent.
Aluminum shot chemical composition is: 98%Al, 0.4%Fe.
Calcification studies and is divided into: CaO >=88.0%, P≤0.01%, S≤0.045%, and C is solid≤and 0.7%, SiO2≤3.0%, activity degree >=350ml, raw burning≤7.0%, granularity: 10 ~ 100mm >=90%.
The chemical composition of fluorite is: CaF
2>=75.0%, SiO
2>=9.0%, P≤0.01%, S≤0.045%, C
gu≤ 0.3%, granularity: 10 ~ 100mm>=90%.
Borax (Na
2b
40
710H
2o) as the boron alloyed raw material of molten steel, chemical constitution is the sodium tetraborate containing 10 water moleculess, 320 DEG C lose whole crystal water, proportion 1.73, containing acidic oxide B in melt
2o
3.The borax added is for containing acidic oxide B
2o
3slag former, significantly can reduce fusing point and the viscosity of slag, be conducive to the floating of inclusion.
Aluminum shot add-on is 0.2kg/t molten steel, and lime adding amount is 5.0kg/t molten steel, and fluorite add-on is 5.0kg/t molten steel, and borax add-on is 0.694kg/t molten steel.
Add 0.2 × 108.0=21.6kg aluminum shot altogether, 5.0 × 108.0=540.0kg lime, 5.0 × 108.0=540.0kg fluorite and 0.694 × 108.0=75kg borax.
3. adopt the energization slag of Graphite Electrodes, after slag charge melts completely, use strong bottom blowing stirring 10 minutes, argon flow amount controls at 700NL/min.Under the effect that argon gas stirs, boron enters into molten steel by diffusion from slag, exists with the form of acid-soluble boron.
4. thermometric sampling, according to result of laboratory test, adjusts Mo, Si, Mn, Cr, Ni composition in molten steel by adding molybdenum-iron, ferrosilicon, silicomanganese, ferrochrome and metallic nickel, and adjustment liquid steel temperature is to 1520 DEG C.
5. feed silicon-calcium wire and carry out Control and Inclusion Removal, silicon-calcium wire feed quantity is 7.0 meters/t molten steel; Silicon-calcium wire weight is 0.25kg/ rice, and chemical composition is, Si:55 ~ 60%, Ca >=28%, P≤0.04%, S≤0.04%; Feeding 7.0 × 108.0=756.0 rice silicon-calcium wire altogether.
Adjustment argon flow amount, weakly blow 15 minutes, argon bottom-blowing flow is 150NL/min; Obtain the satisfactory molten steel of chemical composition.
Get molten steel sample preparation, adopt direct reading spectrometry detection method, according to mass percent, detect that the chemical composition of sample is: C:0.025%, Si:0.50%, Mn:1.15%, P:0.022%, S:0.0005%, Cr:22.30%, Ni:5.20%, Mo:3.12%, N:0.178%, B:0.0028%, other is Fe and relict element.
4. continuous casting: molten steel is transported to continuous casting platform and casts, obtains described boracic two-phase stainless product made from steel.
As can be seen from the detection data of direct-reading spectrometer, in product, boron meets target boron content requirement, illustrates that employing borax can reach boron level in the product adopting ferro-boron or boron line to produce.
Fig. 4 is the metallographic structure photo of the steel grade 2205 duplex stainless steel NO.1 plate that the embodiment of the present invention 2 is produced.
Fig. 5 is the metallographic structure photo of the steel grade 2205 duplex stainless steel NO.1 plate adopting boron line to produce with embodiment 2 the same terms.
Comparison diagram 4 and Fig. 5, can find out: in the stainless steel NO.1 sheet metal phase constitution produced with borax and boron line, there is not crackle.
Embodiment 3
Steel grade 2205 duplex stainless steel, according to mass percent, its chemical composition is, C:0.020%, Si:0.54%, Mn:1.20%, P:0.024%, S:0.0004%, Cr:22.20%, Ni:5.24%, Mo:3.08%, N:0.174%, B:0.0030%, other is Fe and relict element.
The boron alloyed smelting process of boracic duplex stainless steel, comprises the following steps:
1. AOD refining: at 1500 DEG C, according to mass percent, by chemical composition be: C:1.93%, Si:0.10%, Mn:0.31%, P:0.021%, S:0.020%, Cr:18.20%, Ni:5.20%, B:0.0006%, other is that the molten iron 92.5 tons of Fe and relict element is injected in AOD furnace, carries out decarburization, reduction, desulphurization reaction.
1. decarburization: top and bottom complex blowing oxygen carries out decarburization, for adding fast response, bottom blowing nitrogen stirs.The lime of 70kg/t molten steel and the high carbon ferro-chrome of 110.8kg/t molten steel is added in carbon rejection process.Add lime 80 × 105.8=8464kg altogether, high carbon ferro-chrome 110.8 × 105.8=11722.6kg.
When carbon content is less than 0.01%, carry out reducing, the operation of desulfurization.
2. reduce: in AOD furnace, add the ferro-silicon of 13.4kg/t molten steel, the silicomanganese of 15.1kg/t molten steel and the aluminium block of 5.7kg/t molten steel, Cr oxidized in reduced blast furnace
2o
3.At utmost deslagging after this stage terminates.
Add ferro-silicon 13.4 × 105.8=1417.7kg altogether, silicomanganese 15.1 × 105.8=1597.6kg, aluminium block 5.7 × 105.8=603.1kg.
Ferrosilicon composition range is, Si:72 ~ 80%, S≤0.030%, P≤0.040%.Silicomanganese composition range is, Si:20 ~ 25%, Mn:60 ~ 65%, P≤0.040%, S≤0.030%.The composition of aluminium block is: 99.5%Al, 0.4%Fe.
3. desulfurization: the lime adding 10.2kg/t molten steel, makes the basicity of slag in AOD converter be 2.3, makes AOD tapping sulphur content be less than 0.001%; Add lime 10.2 × 105.8=1079.2kg altogether.
Skim after 2.AOD tapping: 105.8t molten steel is poured in baked ladle at 1665 DEG C from AOD furnace, ladle baking to 900 DEG C; Ladle is transported to station of skimming, carries out taking off Slag treatment, staying quantity of slag slag thick is 170mm.
3.LF refining: ladle is transported to LF stove and carry out refining, inlet temperature is 1590 DEG C; Carry out Argon operation after entering the station, argon flow amount controls at 450NL/min.
1. feed aluminum steel adjustment entire oxygen content in the steel content to 0.0018%, aluminum steel feed quantity is 1.2 meters/t molten steel; 1.2 × 105.8=126.96 rice; Aluminum steel weight is 0.3kg/ rice, and chemical composition is: 98%Al, 0.4%Fe.
2. add slag material: aluminum shot, lime and fluorite, add borax simultaneously, borax as steel slag modification agent,
Aluminum shot chemical composition is: 98%Al, 0.4%Fe.
Calcification studies and is divided into: CaO >=88.0%, P≤0.01%, S≤0.045%, and C is solid≤and 0.7%, SiO2≤3.0%, activity degree >=350ml, raw burning≤7.0%, granularity: 10 ~ 100mm >=90%.
The chemical composition of fluorite is: CaF
2>=75.0%, SiO
2>=9.0%, P≤0.01%, S≤0.045%, C
gu≤ 0.3%, granularity: 10 ~ 100mm>=90%.
Borax (Na
2b
40
710H
2o) as the boron alloyed raw material of molten steel, chemical constitution is the sodium tetraborate containing 10 water moleculess, 320 DEG C lose whole crystal water, proportion 1.73, containing acidic oxide B in melt
2o
3.The borax added is for containing acidic oxide B
2o
3slag former, significantly can reduce fusing point and the viscosity of slag, be conducive to the floating of inclusion.
Aluminum shot add-on is 0.25kg/t molten steel, and lime adding amount is 6.0kg/t molten steel, and fluorite add-on is 3.0kg/t molten steel, and borax add-on is 0.709kg/t molten steel.
Add 0.25 × 105.8=26.45kg aluminum shot altogether, 6.0 × 105.8=634.8kg lime, 3.0 × 105.8=317.4kg fluorite, 0.709 × 105.8=75kg borax.
3. adopt the energization slag of Graphite Electrodes, after slag charge melts completely, use strong bottom blowing stirring 15 minutes, argon flow amount controls at 750NL/min.Under the effect that argon gas stirs, boron enters into molten steel by diffusion from slag, exists with the form of acid-soluble boron.
4. thermometric sampling, according to result of laboratory test, by adding molybdenum-iron, ferrosilicon, silicomanganese, ferrochrome and metallic nickel, Mo, Si, Mn, Cr, Ni composition in adjustment molten steel, adjustment liquid steel temperature is to 1523 DEG C.
5. feed silicon-calcium wire and carry out Control and Inclusion Removal, silicon-calcium wire feed quantity is 7.5 meters/t molten steel; Silicon-calcium wire weight is 0.25kg/ rice, and chemical composition is, Si:55 ~ 60%, Ca >=28%, P≤0.04%, S≤0.04%; Feeding 7.5 × 105.8=793.5 rice silicon-calcium wire altogether.
Adjustment argon flow amount, weakly blow 12 minutes, argon bottom-blowing flow is 200 NL/min; Obtain the satisfactory molten steel of chemical composition.
Get molten steel sample preparation, adopt direct reading spectrometry detection method, according to mass percent, detect that the chemical composition of sample is: C:0.020%, Si:0.54%, Mn:1.20%, P:0.024%, S:0.0004%, Cr:22.20%, Ni:5.24%, Mo:3.08%, N:0.174%, B:0.0030%, other is Fe and relict element.
4. continuous casting: molten steel is transported to continuous casting platform and casts, obtains described boracic two-phase stainless product made from steel.
As can be seen from the detection data of direct-reading spectrometer, in product, boron meets target boron content requirement, illustrates that employing borax can reach boron level in the product adopting ferro-boron or boron line to produce.
Fig. 6 is the metallographic structure photo of the steel grade 2205 duplex stainless steel NO.1 plate that the embodiment of the present invention 3 is produced.
Fig. 7 is the metallographic structure photo of the steel grade 2205 duplex stainless steel NO.1 plate adopting boron line to produce with embodiment 3 the same terms.
Comparison diagram 6 and Fig. 7, can find out: in the stainless steel NO.1 sheet metal phase constitution produced with borax and boron line, there is not crackle.
Claims (4)
1. a boron alloyed smelting process for boracic duplex stainless steel, is characterized in that, comprise the following steps:
Step one, AOD refining: at 1500 ~ 1540 DEG C, according to mass percent, by chemical composition be: C:1.70 ~ 2.20%, Si:0.10 ~ 0.26%, Mn:0.25 ~ 0.35%, P≤0.024%, S≤0.03%, Cr:17.80 ~ 18.20%, Ni:5. 00 ~ 5.40%, B:0.0004 ~ 0.0006%, other molten iron for Fe and relict element is injected in AOD furnace, carries out decarburization, reduction, desulphurization reaction;
Step 2, skims after AOD tapping: pour baked ladle at 1650 DEG C ~ 1700 DEG C from AOD furnace by molten steel, ladle baking to 700 ~ 900 DEG C; Ladle is transported to station of skimming, carries out taking off Slag treatment, staying quantity of slag slag thick is 150 ~ 200mm;
Step 3, LF refining: ladle is transported to LF stove and carry out refining, inlet temperature is 1580 DEG C ~ 1600 DEG C; Carry out Argon operation after entering the station, argon flow amount controls at 300 ~ 500NL/min;
1. feed total oxygen content≤0.002% in aluminum steel adjustment molten steel, aluminum steel feed quantity is 1.0 ~ 1.5 meters/t molten steel;
2. slag material is added: aluminum shot, lime and fluorite, add borax simultaneously; Aluminum shot add-on is 0.2 ~ 0.3kg/t molten steel, and lime adding amount is 5.0 ~ 7.0kg/t molten steel, and fluorite add-on is 3.0 ~ 5.0kg/t molten steel, and borax add-on is 0.694kg ~ 0.844 kg/t molten steel;
3. adopt the energization slag of Graphite Electrodes, after slag charge melts completely, use strong bottom blowing stirring 10 ~ 20 minutes, argon flow amount controls at 700 ~ 800NL/min; Under the effect that argon gas stirs, boron enters into molten steel by diffusion from slag, exists with the form of acid-soluble boron;
4. thermometric sampling, according to result of laboratory test, by adding molybdenum-iron, ferrosilicon, silicomanganese, ferrochrome and metallic nickel, Mo, Si, Mn, Cr, Ni composition in adjustment molten steel, adjustment liquid steel temperature is to 1520 ~ 1525 DEG C;
5. feed silicon-calcium wire and carry out Control and Inclusion Removal, silicon-calcium wire feed quantity is 7.0 ~ 8.0 meters/t molten steel; Adjustment argon flow amount, weakly blow 12 ~ 20 minutes, argon bottom-blowing flow is 100 ~ 200 NL/min; The chemical composition obtaining molten steel is, C:0.018 ~ 0.025%, Si:0.48 ~ 0.54%, Mn:1.15 ~ 1.20%, P≤0.025%, S≤0.0005%, Cr:22.20 ~ 22.30%, Ni:5.20 ~ 5.25%, Mo:3.08 ~ 3.12%, N:0.174 ~ 0.184%, B:0.0028 ~ 0.0035%, other is Fe and relict element;
Step 4, continuous casting: molten steel is transported to continuous casting platform and casts, obtains described boracic two-phase stainless product made from steel.
2. the boracic duplex stainless steel prepared of method according to claim 1, is characterized in that,
Step one, AOD refining: at 1530 DEG C, according to mass percent, by chemical composition be: C:1.70%, Si:0.15%, Mn:0.25%, P:0.024%, S:0.03%, Cr:17.95%, Ni:5.40%, B:0.0005%, other molten iron for Fe and relict element is injected in AOD furnace, carries out decarburization, reduction, desulphurization reaction;
Step 2, skims after AOD tapping: pour baked ladle at 1650 DEG C from AOD furnace by molten steel, ladle baking to 800 DEG C; Ladle is transported to station of skimming, carries out taking off Slag treatment, staying quantity of slag slag thick is 200mm;
Step 3, LF refining: ladle is transported to LF stove and carry out refining, inlet temperature is 1580 DEG C; Carry out Argon operation after entering the station, argon flow amount controls at 500NL/min;
1. feed total oxygen content≤0.002% in aluminum steel adjustment molten steel, aluminum steel feed quantity is 1.0 meters/t molten steel;
2. slag material is added: aluminum shot, lime and fluorite, add borax simultaneously; Aluminum shot add-on is 0.3kg/t molten steel, and lime adding amount is 7.0kg/t molten steel, and fluorite add-on is 4.0kg/t molten steel, and borax add-on is 0.844 kg/t molten steel;
3. adopt the energization slag of Graphite Electrodes, after slag charge melts completely, use strong bottom blowing stirring 20 minutes, argon flow amount controls at 800NL/min; Under the effect that argon gas stirs, boron enters into molten steel by diffusion from slag, exists with the form of acid-soluble boron;
4. thermometric sampling, according to result of laboratory test, by adding molybdenum-iron, ferrosilicon, silicomanganese, ferrochrome and metallic nickel, Mo, Si, Mn, Cr, Ni composition in adjustment molten steel, adjustment liquid steel temperature is to 1525 DEG C;
5. feed silicon-calcium wire and carry out Control and Inclusion Removal, silicon-calcium wire feed quantity is 8.0 meters/t molten steel; Adjustment argon flow amount, weakly blow 20 minutes, argon bottom-blowing flow is 100NL/min; The chemical composition obtaining molten steel is, C:0.018%, Si:0.48%, Mn:1.18%, P:0.025%, S:0.0003%, Cr:22.27%, Ni:5.25%, Mo:3.10%, N:0.184%, B:0.0035%, and other is Fe and relict element;
Step 4, continuous casting: molten steel is transported to continuous casting platform and casts, obtaining chemical composition is, C:0.018%, Si:0.48%, Mn:1.18%, P:0.025%, S:0.0003%, Cr:22.27%, Ni:5.25%, Mo:3.10%, N:0.184%, B:0.0035%, other is the boracic two-phase stainless product made from steel of Fe and relict element.
3. the boracic duplex stainless steel prepared of method according to claim 1, is characterized in that,
Step one, AOD refining: at 1540 DEG C, according to mass percent, by chemical composition be: C:2.20%, Si:0.26%, Mn:0.35%, P:0.018%, S:0.013%, Cr:17.80%, Ni:5.00%, B:0.0004%, other molten iron for Fe and relict element is injected in AOD furnace, carries out decarburization, reduction, desulphurization reaction;
Step 2, skims after AOD tapping: pour baked ladle at 1700 DEG C from AOD furnace by molten steel, ladle baking to 700 DEG C; Ladle is transported to station of skimming, carries out taking off Slag treatment, staying quantity of slag slag thick is 150mm;
Step 3, LF refining: ladle is transported to LF stove and carry out refining, inlet temperature is 1600 DEG C; Carry out Argon operation after entering the station, argon flow amount controls at 400NL/min;
1. feed total oxygen content≤0.002% in aluminum steel adjustment molten steel, aluminum steel feed quantity is 1.5 meters/t molten steel;
2. slag material is added: aluminum shot, lime and fluorite, add borax simultaneously; Aluminum shot add-on is 0.2kg/t molten steel, and lime adding amount is 5.0kg/t molten steel, and fluorite add-on is 5.0kg/t molten steel, and borax add-on is 0.694 kg/t molten steel;
3. adopt the energization slag of Graphite Electrodes, after slag charge melts completely, use strong bottom blowing stirring 10 minutes, argon flow amount controls at 700NL/min; Under the effect that argon gas stirs, boron enters into molten steel by diffusion from slag, exists with the form of acid-soluble boron;
4. thermometric sampling, according to result of laboratory test, by adding molybdenum-iron, ferrosilicon, silicomanganese, ferrochrome and metallic nickel, Mo, Si, Mn, Cr, Ni composition in adjustment molten steel, adjustment liquid steel temperature is to 1520 DEG C;
5. feed silicon-calcium wire and carry out Control and Inclusion Removal, silicon-calcium wire feed quantity is 7.0 meters/t molten steel; Adjustment argon flow amount, weakly blow 15 minutes, argon bottom-blowing flow is 150NL/min; The chemical composition obtaining molten steel is, C:0.025%, Si:0.50%, Mn:1.15%, P:0.022%, S:0.0005%, Cr:22.30%, Ni:5.20%, Mo:3.12%, N:0.178%, B:0.0028%, and other is Fe and relict element;
Step 4, continuous casting: molten steel is transported to continuous casting platform and casts, obtaining chemical composition is, C:0.025%, Si:0.50%, Mn:1.15%, P:0.022%, S:0.0005%, Cr:22.30%, Ni:5.20%, Mo:3.12%, N:0.178%, B:0.0028%, other is the boracic two-phase stainless product made from steel of Fe and relict element.
4. the boracic duplex stainless steel prepared of method according to claim 1, is characterized in that,
Step one, AOD refining: at 1500 DEG C, according to mass percent, by chemical composition be: C:1.93%, Si:0.10%, Mn:0.31%, P:0.021%, S:0.020%, Cr:18.20%, Ni:5.20%, B:0.0006%, other molten iron for Fe and relict element is injected in AOD furnace, carries out decarburization, reduction, desulphurization reaction;
Step 2, skims after AOD tapping: pour baked ladle at 1665 DEG C from AOD furnace by molten steel, ladle baking to 900 DEG C; Ladle is transported to station of skimming, carries out taking off Slag treatment, staying quantity of slag slag thick is 170mm;
Step 3, LF refining: ladle is transported to LF stove and carry out refining, inlet temperature is 1590 DEG C; Carry out Argon operation after entering the station, argon flow amount controls at 450NL/min;
1. feed total oxygen content≤0.002% in aluminum steel adjustment molten steel, aluminum steel feed quantity is 1.2 meters/t molten steel;
2. slag material is added: aluminum shot, lime and fluorite, add borax simultaneously; Aluminum shot add-on is 0.25kg/t molten steel, and lime adding amount is 6.0kg/t molten steel, and fluorite add-on is 3.0kg/t molten steel, and borax add-on is 0.709 kg/t molten steel;
3. adopt the energization slag of Graphite Electrodes, after slag charge melts completely, use strong bottom blowing stirring 15 minutes, argon flow amount controls at 750NL/min; Under the effect that argon gas stirs, boron enters into molten steel by diffusion from slag, exists with the form of acid-soluble boron;
4. thermometric sampling, according to result of laboratory test, by adding molybdenum-iron, ferrosilicon, silicomanganese, ferrochrome and metallic nickel, Mo, Si, Mn, Cr, Ni composition in adjustment molten steel, adjustment liquid steel temperature is to 1523 DEG C;
5. feed silicon-calcium wire and carry out Control and Inclusion Removal, silicon-calcium wire feed quantity is 7.5 meters/t molten steel; Adjustment argon flow amount, weakly blow 12 minutes, argon bottom-blowing flow is 200NL/min; The chemical composition obtaining molten steel is, C:0.020%, Si:0.54%, Mn:1.20%, P:0.024%, S:0.0004%, Cr:22.20%, Ni:5.24%, Mo:3.08%, N:0.174%, B:0.0030%, and other is Fe and relict element;
Step 4, continuous casting: molten steel is transported to continuous casting platform and casts, obtaining chemical composition is, C:0.020%, Si:0.54%, Mn:1.20%, P:0.024%, S:0.0004%, Cr:22.20%, Ni:5.24%, Mo:3.08%, N:0.174%, B:0.0030%, other is the boracic two-phase stainless product made from steel of Fe and relict element.
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