CN85101003B - Dephosphorization process of low-phosphorus high-chromium stainless steel and ultralow-phosphorus high-chromium stainless steel - Google Patents
Dephosphorization process of low-phosphorus high-chromium stainless steel and ultralow-phosphorus high-chromium stainless steel Download PDFInfo
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- CN85101003B CN85101003B CN85101003A CN85101003A CN85101003B CN 85101003 B CN85101003 B CN 85101003B CN 85101003 A CN85101003 A CN 85101003A CN 85101003 A CN85101003 A CN 85101003A CN 85101003 B CN85101003 B CN 85101003B
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- stainless steel
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- 239000010935 stainless steel Substances 0.000 title claims abstract description 30
- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 title claims abstract description 26
- 229910052698 phosphorus Inorganic materials 0.000 title claims abstract description 19
- 239000011574 phosphorus Substances 0.000 title claims abstract description 19
- 239000011651 chromium Substances 0.000 title claims abstract description 12
- 229910052804 chromium Inorganic materials 0.000 title abstract description 8
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 109
- 239000010959 steel Substances 0.000 claims abstract description 109
- 238000007670 refining Methods 0.000 claims abstract description 45
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 30
- 239000000843 powder Substances 0.000 claims abstract description 16
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 15
- 229910000599 Cr alloy Inorganic materials 0.000 claims abstract description 8
- 239000000788 chromium alloy Substances 0.000 claims abstract description 8
- 238000005272 metallurgy Methods 0.000 claims abstract description 7
- 239000007788 liquid Substances 0.000 claims abstract 2
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 40
- 239000002893 slag Substances 0.000 claims description 35
- 239000007789 gas Substances 0.000 claims description 25
- 239000001301 oxygen Substances 0.000 claims description 23
- 229910052760 oxygen Inorganic materials 0.000 claims description 23
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 21
- 229910052786 argon Inorganic materials 0.000 claims description 20
- 238000005516 engineering process Methods 0.000 claims description 16
- 229910004709 CaSi Inorganic materials 0.000 claims description 12
- 238000010410 dusting Methods 0.000 claims description 11
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 8
- 238000002347 injection Methods 0.000 claims description 7
- 239000007924 injection Substances 0.000 claims description 7
- 239000007921 spray Substances 0.000 claims description 7
- 229910004261 CaF 2 Inorganic materials 0.000 claims description 6
- 239000011822 basic refractory Substances 0.000 claims description 6
- 229910000975 Carbon steel Inorganic materials 0.000 claims description 5
- 239000010962 carbon steel Substances 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 5
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 claims description 5
- 230000003647 oxidation Effects 0.000 claims description 5
- 238000007254 oxidation reaction Methods 0.000 claims description 5
- 239000000395 magnesium oxide Substances 0.000 claims description 4
- 239000011572 manganese Substances 0.000 claims description 4
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 claims description 4
- 241001062472 Stokellia anisodon Species 0.000 claims description 3
- 238000002844 melting Methods 0.000 claims description 3
- 230000008018 melting Effects 0.000 claims description 3
- 230000001590 oxidative effect Effects 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 230000004907 flux Effects 0.000 claims 2
- 239000004615 ingredient Substances 0.000 claims 2
- 239000000203 mixture Substances 0.000 claims 1
- 229910052784 alkaline earth metal Inorganic materials 0.000 abstract description 10
- 230000002829 reductive effect Effects 0.000 abstract description 6
- 239000003513 alkali Substances 0.000 abstract description 5
- 150000001342 alkaline earth metals Chemical class 0.000 abstract description 5
- 229910045601 alloy Inorganic materials 0.000 abstract description 5
- 239000000956 alloy Substances 0.000 abstract description 5
- UPHIPHFJVNKLMR-UHFFFAOYSA-N chromium iron Chemical compound [Cr].[Fe] UPHIPHFJVNKLMR-UHFFFAOYSA-N 0.000 abstract 1
- 239000000463 material Substances 0.000 abstract 1
- 238000007664 blowing Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 238000010079 rubber tapping Methods 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 239000000428 dust Substances 0.000 description 4
- 239000004411 aluminium Substances 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 239000012159 carrier gas Substances 0.000 description 3
- 238000010891 electric arc Methods 0.000 description 3
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 2
- 235000017491 Bambusa tulda Nutrition 0.000 description 2
- 241001330002 Bambuseae Species 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 2
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- 239000005864 Sulphur Substances 0.000 description 2
- 229910052787 antimony Inorganic materials 0.000 description 2
- WATWJIUSRGPENY-UHFFFAOYSA-N antimony atom Chemical compound [Sb] WATWJIUSRGPENY-UHFFFAOYSA-N 0.000 description 2
- 229910052785 arsenic Inorganic materials 0.000 description 2
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 description 2
- 239000011425 bamboo Substances 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 238000009834 vaporization Methods 0.000 description 2
- 230000008016 vaporization Effects 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910000604 Ferrochrome Inorganic materials 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- XCNJCXWPYFLAGR-UHFFFAOYSA-N chromium manganese Chemical compound [Cr].[Mn].[Mn].[Mn] XCNJCXWPYFLAGR-UHFFFAOYSA-N 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000005261 decarburization Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000009847 ladle furnace Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
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- Treatment Of Steel In Its Molten State (AREA)
Abstract
The research on a good dephosphorization agent adding method to improve the utilization rate is the key to improve the dephosphorization rate of the high-chromium stainless steel. The invention uses the method of jet metallurgy, and takes powder of alkali or alkaline earth metal and alloy thereof as dephosphorizing agent to be sprayed into high-chromium stainless steel liquid in a ladle or a ladle refining furnace for dephosphorization. Under industrial conditions, the dephosphorization rate reaches 71-89%, and the phosphorus content in steel can be reduced to 0.005%. The low-phosphorus or ultra-low-phosphorus high-chromium stainless steel can be produced by using the common high-chromium stainless steel return material or common iron-chromium alloy.
Description
General carbon steel and low-alloy steel grade are used oxidation style dephosphorization principle, are easy to phosphorus content in the steel is reduced to extremely low level.But oxidation style is for high chromium or Gao Meng, or the steel grade of high chromium manganese, high nitrogen-containing, then is difficult to phosphorus is removed from molten steel.In recent years, the blue principle of making the dephosphorization under reducing atmosphere of using in JSW chamber is used the method for putting, and under the condition that imports argon gas stirring molten steel at the bottom of the ladle bag, adds dephosphorizing agent CaC in batches
2Dephosphorization treatment is carried out to the molten steel of chrome content 28～45% in molten steel surface in ladle, and under the commerical test condition, dephosphorization rate reaches 42～66% (within the bamboo friend husband etc., Japanese Metallkunde can be reported, the 23rd volume, No. 4 (1984) P267).The shortcoming of this technology is: dephosphorizing agent and molten steel contact interface area are little, and effective acting time is short, and the vaporization losses of dephosphorizing agent calcium is big, and the dephosphorizing process time is long, and dephosphorization effect is relatively poor.
The objective of the invention is to: the method for using injection metallurgy, the powdery dephosphorizing agent is sprayed into high chromium-stainless steel molten steel depths in ladle or the ladle refining furnace, increase dephosphorizing agent and molten steel contact interface area, increase dephosphorizing agent and effective dephosphorizing time of molten steel, shorten the time of dephosphorization operating process, reduce the vaporization losses of dephosphorizing agent, improve dephosphorization rate.
Dephosphorization technology for low-phosphorous high chromium-stainless steel, be used in Gao Ge ((Cr) 〉=4.0%) or Gao Meng ((Mn) 〉=2.0%), or Gao Ge, manganese, after high nitrogen-containing ((N) 〉=0.10%) series stainless steel, wear resisting steel, very low temperature steel furnace chargeization are clear, thermometric, can deoxidation when molten steel temperature is 1560～1580 ℃, remove the fusing slag.Can with 6: 2: 2, add CaO+CaC by accounting for 3～5% of molten steel weight again
2+ CaF
2Slag charge is made new slag.After changing slag, thermometric is decided oxygen, can be 1550～1580 ℃ at molten steel temperature, when oxygen level is lower than 30～100ppm, the band slag is tapped in ladle or the ladle refining furnace, and its cylinder-packing can be the basic refractory knotting and forms, and said basic refractory can be magnesia or rhombspar.In the tapping process, can in ladle or ladle refining furnace, add the additional deoxidation of 0.5 kilogram of/ton steel of aluminium.Ladle or ladle refining furnace preferably toast through careful before use.
Molten steel goes out behind ladle or ladle refining furnace, preferably seals, and inertia or restitutive protection's gas are blown in portion top, molten bath in ladle or the ladle refining furnace from it, argon gas for example, and Argon pressure can be 0.5～0.8 normal atmosphere (gauge pressure).
Thermometric is decided oxygen, and being preferably in molten steel temperature is 1500～1560 ℃, when oxygen content in steel is lower than 30～100ppm, as dephosphorizing agent, carries out the powder dephosphorization operation with the pulvis of alkali or alkaline-earth metal and alloy thereof.The pulvis of said alkali or alkaline-earth metal and alloy thereof can be CaC
2+ CaSi mixing powder, or CaC
2, or the single pulvis of CaSi.The most handy argon gas of carrier gas.Straying quatity can be controlled at 2.0～5.0%(molten steel weight percent), dusting speed can be 10～30 kilograms of/ton steel branches, powder spraying apparatus can be used known powder distributor, a consumable formula single hole spray gun or a hole and a hole above porous permanent type spray gun, and fuel regulating system.
Behind the powder dephosphorization; preferably continue sealing, under the condition of blowing argon,, injecting an a refining unit with the molten steel of handling well; but notice preventing that dephosphorized slag from entering a refining unit, this a refining unit can be ladle refining furnace or the VOD or the AOD stove of band oxygen blast system.In refining furnace, carry out oxygen decarburization and other refining procedure.
The present invention with the blue technology of making institute in chamber relatively has the dephosphorizing process time to lack, dephosphorizing agent utilization ratio height, and dephosphorization effect is good.Through commerical test, dephosphorization rate of the present invention for 18-8 type stainless steel, reaches 74～89%, for the 1Cr18Mn9Ni4Mo3Cu2N stainless steel, reaches 71～78%.Simultaneously, can also reduce the content of harmful elements such as oxygen in the steel, sulphur, nitrogen and arsenic, lead, antimony significantly.
For the dephosphorization technology of ultralow phosphorus high chromium-stainless steel, the blue institute's duplex of the using smelting method of making in JSW chamber, i.e. high-chromium alloy application reduction method dephosphorization principle, after molten steel is come out of the stove, place ladle, importing from the bag end under the condition of argon gas stirring molten steel, use the method for putting, with dephosphorizing agent CaC
2Add the molten steel ladle surface in batches, carry out dephosphorization treatment; In another electric arc furnace, smelt the carbon element molten steel,, in stove, carry out dephosphorization under oxidizing atmosphere with oxidation style dephosphorization principle.Through the high-chromium alloy molten steel of dephosphorization treatment, from ladle, inject the VOD stove, in the VOD stove, carry out vacuum-oxygen decarbonizing.Then, the carbon steel molten steel of dephosphorization treatment injects ladle refining furnace together together, is mixed into low-phosphorous high-chromium stainless steel fluid ((P)＜0.010%) in ladle refining furnace, heating, and vacuum refinement (friend husband etc. within the bamboo, Japanese Metallkunde can be reported, the 23rd volume, No. 4 (1984) P267).As previously mentioned, aforesaid method exists the high-chromium alloy molten steel dephosphorization treatment time long, and the dephosphorizing agent utilization ratio is lower, and dephosphorization effect is relatively poor, thereby is difficult to produce ultralow phosphorus high chromium-stainless steel ((P)≤0.005%).
The objective of the invention is to use the injection metallurgy method, replace the method for putting of using, add the technology of dephosphorizing agent in batches, therefore, shortened the dephosphorization treatment time, improved the utilization ratio of dephosphorizing agent, obtained higher dephosphorization effect.Not only can produce low-phosphorous ((P)＜0.010%) high chromium-stainless steel, and can produce ultralow phosphorus ((P)≤0.005%) high chromium-stainless steel.
Dephosphorization technology for ultralow phosphorus high chromium-stainless steel, be used in Gao Ge ((Cr) 〉=4.0%) or Gao Meng ((Mn) 〉=2.0%), or stainless steel, wear resisting steel, the very low temperature steel of Gao Ge, manganese, high nitrogen-containing ((N) 〉=0.10%) series, after furnace chargeization is clear, thermometric can carry out deoxidation treatment, after the deoxidation when temperature is 1560～1580 ℃, preferably remove the fusing slag, add CaO+CaC
2+ CaF
2Slag charge can be by 6: 2: 2 ratio, and add-on can be controlled in 3～5%(molten steel weight percent) make new slag.After changing slag, thermometric is decided oxygen, can be 1550～1580 ℃ of temperature, and when oxygen content in steel was lower than 30～100ppm, the band slag was tapped in ladle or the ladle refining furnace.The cylinder-packing of said ladle or ladle refining furnace can form for the basic refractory knotting, and this class basic refractory can be magnesia or rhombspar.In the tapping process, can in ladle or ladle refining furnace, add the additional deoxidation of 0.5 kilogram of/ton steel of aluminium.Ladle or ladle refining furnace preferably toast through careful before use.
Molten steel goes out behind ladle or ladle refining furnace, preferably seals, and inertia or restitutive protection's gas are blown in portion top, molten bath in ladle or the ladle refining furnace from it, argon gas for example, and Argon pressure can be controlled in 0.5～0.8 normal atmosphere (gauge pressure).
Thermometric is decided oxygen.Being preferably in molten steel temperature is 1500～1560 ℃, when oxygen level is lower than 30～100ppm, as dephosphorizing agent, carries out the powder dephosphorization operation with alkali or alkaline-earth metal and alloy powder thereof.Said alkali or alkaline-earth metal and alloy powder thereof can be CaC
2+ CaSi mixing powder, or CaC
2, or the single pulvis of CaSi.Powder spraying apparatus can be with foregoing the same, and argon gas is also preferably adopted in carrier gas.Straying quatity may be controlled to 4.0～5.5%(molten steel weight percent), dusting speed is controlled to be made as 10～30 kilograms of/ton steel branches.
Behind the powder dephosphorization, the molten steel of handling well is injected a refining unit, this a refining unit can be the ladle refining furnace of band oxygen blast system, carries out vacuum-oxygen decarbonizing therein.Inject the process of ladle refining furnace at molten steel, preferably continue to seal, blowing argon, and note preventing that dephosphorized slag from entering ladle refining furnace.
The carbon steel molten steel is founded in another steel melting furnace, can be electric arc furnace.After molten steelization is clear, thermometric.Can when temperature is 1500～1560 ℃, remove the partial melting slag, can with 8: 2 ratio, add CaO+CaF by accounting for molten steel weight 2-4%
2Slag charge is made new slag.After changing slag, thermometric is with oxidation style dephosphorization principle, with the method for injection metallurgy, toward the interior powder dephosphorization of stove.The beginning molten steel temperature that dusts can be 1500～1560 ℃, the most handy CaO+CaF of dephosphorization pulvis
2+ Fe
2O
3, its ratio can be by 6: 2: 2, and straying quatity can be by 2.0～5.0%(molten steel weight percent) control.The most handy oxidizing gas of carrier gas such as oxygen, dusting speed can be 6.0～10.0 kilograms of/ton steel branches.Behind the powder dephosphorization, molten steel is gone out in an a refining unit, through the high-chromium alloy molten steel mixing of dephosphorization, carbonization treatment, heat vacuum refinement with.This a refining unit can be a ladle refining furnace.
The present invention is with the blue technology comparison of making institute in chamber, owing to adopt the injection metallurgy method to spray into the dephosphorization pulvis, ladle or ladle refining furnace seal, and portion is blown into argon gas from it, shortened the dephosphorization treatment time, improved the utilization ratio of dephosphorizing agent, obtained high dephosphorization effect, and the content that has reduced trace impurities such as oxygen, sulphur, nitrogen and arsenic, lead, antimony, tin significantly as previously described outside, use the present invention and can adopt common stainless steel returns and general ferrochrome exothermic, produce phosphorus content and be lower than 0.005% ultralow phosphorus high chromium-stainless steel.
Embodiment 1
The dephosphorization of 1Cr18Ni9Ti
1. charging: dress 18-8 returns in 3 tons of electric arc furnace～5 tons, 5 kilograms at adding electrode.
2. energising, fusing (the roasting ladle of slow fire behind the notice stove)
3. change clear (the roasting ladle of big fire behind the notice stove)
Get the steel sample 1.
Slag specimen 1.
The gas sample 1.
4. add reductive agent
5. thermometric T=1600 ℃, insert the Al deoxidation.
6. skim
7. add new slag charge: CaO: CaC
2: CaF
2=6: 2: 2, add-on 4%(molten steel weight percent), add in batches.
8. change slag.
9. thermometric is decided oxygen, and T=1575 ℃, (O)=12pp
m
10. get the gas sample 2.
11. tapping.Add Al0.5 kilogram/ton steel toward ladle in the tapping
12. in bag, get the steel sample 2. slag specimen 2. the gas sample is 3.
13. thermometric is decided oxygen.
14. add the ladle lid.
15. blowing argon.(argon pressure is 0.5 normal atmosphere)
16. dust.(in ladle refining furnace, add slag charge CaO: CaF simultaneously
2Press molten steel weight 2～4% at=8: 2 adds)
Pulvis: CaC
2+ CaSi, proportioning 3: 2
Straying quatity: 44.8 kilograms of/ton steel
Dusting speed: 10.7 kilograms of/ton steel branches
Tank pressure dusts: 4 normal atmosphere (gauge pressure)
Main blow pressure power: 3.7 normal atmosphere (gauge pressure)
The end 17. dust continues blowing argon, and molten steel injects ladle refining furnace, notice preventing that dephosphorized slag from injecting ladle refining furnace, and Argon pressure is 0.8 normal atmosphere (gauge pressure).
18. 3. the gas sample is 4. to get the steel sample in beam
19. in ladle, get slag specimen 3.
20. melt down complete
21. in ladle refining furnace, get the steel sample 4., slag specimen 4., the gas sample 5.
22 finish the operation of other common processing requirement in ladle refining furnace.
Dephosphorization result such as table 1
| Sequence number | Molten steel amount (ton) | Dephosphorization pulvis type | Straying quatity % | Phosphorus content % in the steel | Dephosphorization rate % | |
| Before the spray | After the spray | |||||
| 1234 | 5.55.55.55.5 | CaC 2+CaSi″″″ | 4.484.55.05.0 | 0.0380.0400.0450.039 | 0.0100.0050.0050.005 | 74888987 |
Embodiment 2
The stainless dephosphorization of 1Cr18Mn9Ni4MO3Cu2N
1. charging, this steel foundry returns and this steel steel cuttings, 5 kilograms of top electrodes.
2. energising (slow fire baking bag behind the notice stove)
3. change clear (big fire baking bag behind the notice stove)
4. get the steel sample 1., slag specimen 1., the gas sample 1.
5. add reductive agent
6. thermometric T=1480 ℃
7. insert aluminium deoxidation, add reductive agent
8. thermometric is decided oxygen, T=1520 ℃ of (O)=7ppm
9. skim
10. add new slag charge: CaO: CaC
2: CaF
2=6: 2: 2, press molten steel weight 4% and add.
11. change slag
12. thermometric T=1530 ℃ of (O)=12ppm
13. tapping adds Al0.5 kilogram/ton steel in ladle
14. get the steel sample in the ladle 2.
Slag specimen 2.
The gas sample 2.
15. add the ladle lid
16. blowing argon (Argon pressure is 0.5 normal atmosphere (gauge pressure))
(in ladle refining furnace, add slag charge CaO: CaF simultaneously 17. dust
2=8: 2, press molten steel amount 3% and add).
Pulvis: CaC
2+ CaSi, proportioning 3: 2
Straying quatity: 50 kilograms of/ton steel
Dusting speed: 11.9 kilograms of/ton steel branches
Tank pressure dusts: 4 normal atmosphere (gauge pressure)
Main blow pressure power: 3.7 normal atmosphere (gauge pressure)
The end 18. dust, molten steel injects ladle refining furnace, Argon pressure 0.8 normal atmosphere (gauge pressure).
19. 3. the gas sample is 3. to get the steel sample in beam
20. in ladle, get slag specimen 3.
21. melt down complete
22. in ladle refining furnace, get the steel sample 4., slag specimen 4., the gas sample 4.
23. thermometric
24. in ladle furnace, finish other common refining procedures.
Result sees Table 3
| Sequence number | Molten steel amount (ton) | Dephosphorization pulvis type | Straying quatity % | Phosphorus content % in the steel | Dephosphorization rate % | |
| Before dusting | After dusting | |||||
| 1 | 7.5 | CaC 2+CaSi | 4.5 | 0.045 | 0.013 | 71 |
| 2 | 5.5 | ″ | 5.0 | 0.074 | 0.014 | 78 |
Claims (6)
1, the dephosphorization technology of low-phosphorous high chromium-stainless steel is used reduction method dephosphorization principle, after molten steel is come out of the stove, places ladle, adds dephosphorizing agent in molten steel, carries out dephosphorization.Feature of the present invention is: for Gao Ge ((Cr) 〉=4.0%) or Gao Meng ((Mn) 〉=2.0%) or Gao Ge, manganese, high nitrogen-containing ((N) 〉=0.1%) series stainless steel, and wear resisting steel, the very low temperature steel carries out dephosphorization treatment.Said dephosphorization technology is the method with injection metallurgy; go out in ladle or ladle refining furnace at molten steel; under the lid flux shielding of controlling molten steel temperature, oxygen level and newly making; sealing And is blown under the condition of inertia or restitutive protection's gas from the molten steel top; as carrier, dephosphorizing agent is sprayed into the molten steel depths with rare gas element (for example argon gas), carry out dephosphorization.Said dephosphorizing agent is CaC
2+ CaSi mixing powder, or CaC
2, or the single pulvis of CaSi, said ladle or ladle refining furnace should be liner with magnesia or other basic refractories.
2, according to the dephosphorization technology of the low-phosphorous high chromium-stainless steel of claim 1, it is characterized in that Control for Oxygen Content is being lower than 30～100PPm in the preceding molten steel of the said processing of dusting, molten steel temperature is controlled at 1500～1560 ℃, when dusting, the speed control that sprays into of dephosphorizing agent is 10～30 kilograms of/ton steel branches, and the dephosphorizing agent straying quatity is that 2.0～5.0%(accounts for the molten steel weight percent).
3,, it is characterized in that the said lid slag ingredient of newly making for by accounting for 3～5% of molten steel weight, to add CaO+CaC at 6: 2: 2 according to the dephosphorization technology of the low-phosphorous high chromium-stainless steel of claim 1
2+ CaF
2Slag charge causes.
4, the dephosphorization technology of ultralow phosphorus high chromium-stainless steel adopts duplex to smelt method, and promptly the high-chromium alloy molten steel is used the reduction method dephosphorization, after molten steel is come out of the stove, places ladle, adds dephosphorizing agent in molten steel, carries out dephosphorization; In another steel melting furnace, smelt carbon steel ， And and use the oxidation style dephosphorization, use injection metallurgical method, the dephosphorization under oxidizing atmosphere agent is added in the molten steel in the stove, carbon steel liquid is carried out dephosphorization treatment.More than two kinds of molten steel, pour in a refining unit, mix refining.Feature of the present invention is: carry out dephosphorization treatment for Gao Ge ((Cr) 〉=4.0%) or Gao Meng ((Mn) 〉=2.0%) or Gao Ge, manganese, high nitrogen-containing ((N) 〉=0.1%) series stainless steel, wear resisting steel, very low temperature steel.Said dephosphorization technology is the method with injection metallurgy; go out in ladle or ladle refining furnace at molten steel; under the lid flux shielding of controlling molten steel temperature, oxygen level and newly making; sealing And is blown under the condition of inertia or restitutive protection's gas from the molten steel top; as carrier, dephosphorizing agent is sprayed into the molten steel depths with rare gas element (for example argon gas), carry out dephosphorization.Said dephosphorizing agent is CaC
2+ CaSi mixing powder, or CaC
2, or the single pulvis of CaSi, said ladle or ladle refining furnace should be liner with magnesia or other basic refractories.
5, according to the dephosphorization technology of the ultralow phosphorus high chromium-stainless steel of claim 4, it is characterized in that said high-chromium alloy molten steel is before the processing of dusting, Control for Oxygen Content is lower than 30～100PPm in the molten steel, molten steel temperature is controlled at 1500～1560 ℃, when dusting, the speed that sprays into of dephosphorizing agent adopts 10～30 kilograms of/ton steel branches, and the pulvis straying quatity is that 4.0～5.5%(accounts for the molten steel weight percent).
6,, it is characterized in that the lid slag ingredient of newly making of said high-chromium alloy molten steel can be by accounting for 3～5% of molten steel weight, to add CaO+CaC at 6: 2: 2 according to the dephosphorization technology of the ultralow phosphorus high chromium-stainless steel of claim 4
2+ CaF
2Slag charge causes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN85101003A CN85101003B (en) | 1985-04-01 | 1985-04-01 | Dephosphorization process of low-phosphorus high-chromium stainless steel and ultralow-phosphorus high-chromium stainless steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN85101003A CN85101003B (en) | 1985-04-01 | 1985-04-01 | Dephosphorization process of low-phosphorus high-chromium stainless steel and ultralow-phosphorus high-chromium stainless steel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN85101003A CN85101003A (en) | 1986-08-06 |
| CN85101003B true CN85101003B (en) | 1988-08-24 |
Family
ID=4791575
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN85101003A Expired CN85101003B (en) | 1985-04-01 | 1985-04-01 | Dephosphorization process of low-phosphorus high-chromium stainless steel and ultralow-phosphorus high-chromium stainless steel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN85101003B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100447271C (en) * | 2005-05-30 | 2008-12-31 | 宝山钢铁股份有限公司 | Method for smelting carbon dioxide corrosion resistant steel |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101020943A (en) | 2006-07-12 | 2007-08-22 | 刘光火 | Phosphorus reducing method for process of smelting Ni-Cr pig iron with nickel oxide ore |
| CN102643946B (en) * | 2012-04-24 | 2013-11-06 | 北京科技大学 | Converter steelmaking method through power injection dephosphorization by adopting supersonic speed oxygen lance and supersonic speed oxygen lance |
| CN102766726A (en) * | 2012-08-02 | 2012-11-07 | 山西太钢不锈钢股份有限公司 | Method for smelting stainless steel by high-chrome melt and dephosphorized pre-melt |
| CN108998616A (en) * | 2018-09-14 | 2018-12-14 | 山东国铭球墨铸管科技有限公司 | A kind of purification of the pig iron and its smelting process |
-
1985
- 1985-04-01 CN CN85101003A patent/CN85101003B/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100447271C (en) * | 2005-05-30 | 2008-12-31 | 宝山钢铁股份有限公司 | Method for smelting carbon dioxide corrosion resistant steel |
Also Published As
| Publication number | Publication date |
|---|---|
| CN85101003A (en) | 1986-08-06 |
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