CN100507022C - Method for direct smelting of austenitic stainless steel by AOD full iron - Google Patents
Method for direct smelting of austenitic stainless steel by AOD full iron Download PDFInfo
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- CN100507022C CN100507022C CNB2006100284742A CN200610028474A CN100507022C CN 100507022 C CN100507022 C CN 100507022C CN B2006100284742 A CNB2006100284742 A CN B2006100284742A CN 200610028474 A CN200610028474 A CN 200610028474A CN 100507022 C CN100507022 C CN 100507022C
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 62
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 31
- 238000003723 Smelting Methods 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 title claims abstract description 20
- 229910000963 austenitic stainless steel Inorganic materials 0.000 title claims description 10
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 49
- 239000010959 steel Substances 0.000 claims abstract description 49
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 34
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 34
- 239000001301 oxygen Substances 0.000 claims abstract description 34
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 23
- 238000007664 blowing Methods 0.000 claims abstract description 22
- 229910000519 Ferrosilicon Inorganic materials 0.000 claims abstract description 11
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 11
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000010439 graphite Substances 0.000 claims abstract description 8
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 8
- 239000011261 inert gas Substances 0.000 claims abstract description 5
- 238000010438 heat treatment Methods 0.000 claims abstract 2
- 238000005261 decarburization Methods 0.000 claims description 25
- 239000011651 chromium Substances 0.000 claims description 20
- 238000006477 desulfuration reaction Methods 0.000 claims description 17
- 230000023556 desulfurization Effects 0.000 claims description 17
- 229910000604 Ferrochrome Inorganic materials 0.000 claims description 13
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 11
- 229910052804 chromium Inorganic materials 0.000 claims description 11
- 239000000571 coke Substances 0.000 claims description 7
- 238000004321 preservation Methods 0.000 claims 1
- 229910001220 stainless steel Inorganic materials 0.000 abstract description 17
- 239000010935 stainless steel Substances 0.000 abstract description 17
- 229910001566 austenite Inorganic materials 0.000 abstract 1
- 230000003009 desulfurizing effect Effects 0.000 abstract 1
- 239000000203 mixture Substances 0.000 description 16
- 230000003647 oxidation Effects 0.000 description 14
- 238000007254 oxidation reaction Methods 0.000 description 14
- 238000005516 engineering process Methods 0.000 description 13
- 239000012452 mother liquor Substances 0.000 description 11
- 239000007788 liquid Substances 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 8
- 238000010079 rubber tapping Methods 0.000 description 8
- 239000007789 gas Substances 0.000 description 7
- 238000007670 refining Methods 0.000 description 6
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 5
- 241001062472 Stokellia anisodon Species 0.000 description 5
- 235000011941 Tilia x europaea Nutrition 0.000 description 5
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 5
- 239000003795 chemical substances by application Substances 0.000 description 5
- 239000010436 fluorite Substances 0.000 description 5
- 239000004571 lime Substances 0.000 description 5
- 229910052748 manganese Inorganic materials 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 230000002829 reductive effect Effects 0.000 description 5
- 229910052717 sulfur Inorganic materials 0.000 description 5
- 229910052799 carbon Inorganic materials 0.000 description 4
- 229910052698 phosphorus Inorganic materials 0.000 description 4
- 238000009628 steelmaking Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 229910018619 Si-Fe Inorganic materials 0.000 description 3
- 229910008289 Si—Fe Inorganic materials 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 239000004615 ingredient Substances 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 238000005262 decarbonization Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 229910000863 Ferronickel Inorganic materials 0.000 description 1
- 108010038629 Molybdoferredoxin Proteins 0.000 description 1
- 241001417490 Sillaginidae Species 0.000 description 1
- HBELESVMOSDEOV-UHFFFAOYSA-N [Fe].[Mo] Chemical compound [Fe].[Mo] HBELESVMOSDEOV-UHFFFAOYSA-N 0.000 description 1
- VVTSZOCINPYFDP-UHFFFAOYSA-N [O].[Ar] Chemical compound [O].[Ar] VVTSZOCINPYFDP-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 229910052785 arsenic Inorganic materials 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000007799 cork Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 239000003085 diluting agent Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000009847 ladle furnace Methods 0.000 description 1
- 229910052745 lead Inorganic materials 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000010970 precious metal Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
- 239000011573 trace mineral Substances 0.000 description 1
- 235000013619 trace mineral Nutrition 0.000 description 1
- 230000003245 working effect Effects 0.000 description 1
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- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention discloses a smelting method of austenite stainless steel through AOD full-molten iron directly, which comprises the following steps: putting 15-30Kg/t steel ferrosilicon and 20-40Kg/t steel graphite or char into the furnace at the beginning of converting; heating the molten pool temperature to 1600-1700 deg. c; using top-blowing oxygen gun and side blow vent to supply oxygen; controlling the oxygen flow and inert gas flow over 10: 1; adding the nickel over 90% in the stage; finishing the course when the [C] is 1.5-2.5wt%; entering the decarburizing chromine-keeping stage and reducing desulfurizing stage.
Description
Technical field
The present invention relates to the stainless steel-making process field, more particularly, relate to the method for AOD whole melted iron directly smelting austenitic stainless steel.
Background technology
At present, the processing step of common in the world AOD stove (argon oxygen decarburizing furnace) stainless steel-making process is:
In electric furnace, stainless steel refining → carry out vacuum decarburization is smelted → carried out to dephosphorization molten iron and steel scrap in the AOD stove in VOD (vacuum decarburization stove) stove and handle, or in LF/LTS (ladle furnace/ladle treatment station), handle → continuous casting.
In above-mentioned technology, existing AOD stove is mainly used in the stainless steel refining, and raw material adopts the mother liquor of stainless steel that is smelt by furnace melting steel scrap and alloy, as diluent gas, reduces Pco with argon gas, and chrome-bearing steel liquid is carried out decarburization and cr yield.
Particularly, the composition (weight percent) from the mother liquor of electric furnace is controlled to be in the AOD refinery practice: C 1.0%～3.0%, and Mn 0～0.2%, and Si 0～0.35%, and S 0～0.020%, and P 0～0.035%, and Cr 16.0%～19.0%, and Ni 0～7.5%; The mother liquor temperature: 1500～1580 ℃, 110～120 tons of mother liquor weight.
Technology by the mother liquor smelting stainless steel is divided into two main phase: decarburization and cr yield stage and reduction, desulfurization stage.The concrete operations step is as follows:
1) the electric furnace mother liquor is blended into the AOD converter, measures the mother liquor temperature, blow by oxygen supply, the air feed standard of the listed blowing pattern of table 1;
Table 1 Nm
3/ min
2) reach 2000～3000Nm at blowing oxygen quantity
3Remaining ferrochrome of Shi Peijia and ferronickel;
3) when blowing oxygen quantity reaches whole oxygen-supplying amounts and finishes decarburization (temperature is controlled at about 1700 ℃), add reductive agent ferrosilicon 20～25kg/t and carry out restoring operation;
4) reduction is carried out desulfurization operations after finishing, and the lime of adding 10～15kg/ ton steel, the fluorite of 6～10kg/ ton steel carry out desulfurization.
5) carry out molten steel component fine setting, tap after meeting ingredient standard.
The AOD molten steel component (weight percent) of tapping: C 0.012%～0.080%, and Mn 0.60%～2.0%, and Si 0.20%～0.50%, S 0.001%～0.010%, and P 0～0.035%, and Cr 15.0%～19.0%, Ni 8.0～12.0%, and Mo 0～2%, N0～1500ppm; Tapping liquid steel temperature: 1600～1650 ℃.
In sum, existing AOD smelting technology all adopts furnace melting steel scrap, alloy and partial molten iron, enters the AOD stove then and carries out refining, though can smelt qualified stainless steel, has following defective:
1) because quite high with the smelting mother liquor of stainless steel from electric furnace power consumption, electric power consumption per ton steel is 320～360kwh, has correspondingly increased production cost;
2) electric furnace production must blowing out be carried out the refractory materials maintenance after 7～10 days, needed to stop production 10～24 hours, and the whole piece stainless steel production line must stop production 10～24 hours like this, and the production production capacity is subjected to very big influence;
3) owing to just needing to use steel scrap in the refining process, it is higher therefore to smelt the stainless steel micro impurity element content that;
4) operational path is long, and production unit occupation of land amount is big.
Summary of the invention
The objective of the invention is to save electric furnace and just refine operation, adopt blast-melted (behind the dephosphorization) and add alloy, by the control of the temperature in the AOD smelting process, blowing pattern, decarburization and cr yield technology, top rifle oxygen supply technology, the pattern of feeding intake are improved, form a kind of in the AOD stove the direct method of smelting austenitic stainless steel.
For achieving the above object, the invention provides a kind of method of AOD whole melted iron directly smelting austenitic stainless steel, this method adopts full molten iron directly to be blended in the AOD stove to smelt, being divided into three phases carries out: in the decarburization temperature rise period, promptly in stove, drop into the ferrosilicon of 15～30Kg/ ton steel and the graphite or the coke of 20～40Kg/ ton steel after the blowing beginning, make bath temperature be climbed to 1600 ℃～1700 ℃, and by top blow oxygen lance and cross air blow confession oxygen, the ratio that this moment, oxygen rifle oxygen flow added uptake oxygen flow and the flow of air port rare gas element is controlled at more than the 10:1; The nickel of required input will drop in this stage more than 90%, and [C] finishes when content controls to 1.5～2.5wt% when the molten bath; Then enter the decarburization and cr yield stage, when bath temperature reaches 1680 ℃～1720 ℃, just drop into ferrochrome with 2～3 tons/minute speed, be controlled at more than the 10:1 at the ratio of this stage oxygen flow with inert gas flow, as molten bath [C] when reaching 0.45～0.65wt%, the ratio control of oxygen and rare gas element is equal to general AOD smelting technology, and end temp is controlled at 1680 ℃～1730 ℃; Enter the reduction and desulfurization stage then, this stage is equal to general AOD smelting technology.
Main technologic parameters control is as follows:
The operational path of the full molten iron smelting austenitic stainless steel of AOD is divided into the two step method without electric furnace, and promptly the dephosphorization molten iron is directly smelted to the finished product molten steel at AOD, handles through LF stove or LTS again; With the three-step approach without electric furnace, promptly the dephosphorization molten iron is directly smelted to C content 0.15%～0.50% at AOD, handles through VOD stove vacuum decarburization again.
1) need the composition and the temperature thereof of control to see Table 2 in the full molten iron
Table 2
| C | Si | Mn | S | P | Temperature |
| ≥2.5％ | - | - | ≤0.020％ | ≤0.015％ | ≥1100℃ |
2) iron water amount: calculate by 60%～65% of tap.
3) AOD smelts step
With the full molten iron smelting austenitic stainless steel of AOD technology, be divided into three main phase:
The 1st stage: decarburization, temperature rise period;
The 2nd stage: decarburization and cr yield stage;
The 3rd stage: reduction, desulfurization stage (this stage is consistent with existing AOD technology).
The 1st step: the 1st stage, because molten iron temperature is lower, take off the requirement that C protects Cr in order to reach, reduce the oxidation of precious metal Cr, as early as possible with the C oxidation removal, therefore the critical point temperature according to the C-Cr selective oxidation requires (more than 1560 ℃), after AOD blowing beginning, promptly drop into the ferrosilicon of 15～30Kg/ ton steel and the graphite (also can use coke) of graphite (coke) 20～40Kg/ ton steel, make bath temperature be elevated to 1600～1700 ℃ rapidly, drop into solid-state ferrochrome so again, remove ferrochrome fusing heat absorption, bath temperature is remained on more than 1560 ℃, reach the purpose that reduces the chromium oxidation.Because there is not the problem of selective oxidation in nickel, therefore, at the metallic nickel (316 be stainless steel also will add molybdenum-iron) of this stage input more than 90%, input amount is according to the nickel composition requirement of institute's steelmaking kind.
The 2nd step: the 2nd stage, when the molten bath is warmed up to 1600～1700 ℃, C 1.00%～2.00% the time, should be with slag in the stove to clean (reduce the quantity of slag in the stove, reduce the dividing potential drop of CO, thereby improve oxygen utilization rate).In the time of 1680 ℃～1720 ℃, begin to add ferrochrome, 2～3 tons/minute, the ferrochrome add-on is calculated according to institute's steelmaking kind chromium component, keeps bath temperature to be stabilized in more than 1560;
The 3rd step: when decarburization finishes, [C]=0.012%～0.05%, the critical temperature of C-Cr is about 1680 ℃, so the molten bath optimum temps is controlled at 1680～1730 ℃, low excessively Cr excessive oxidation cost is increased, and too highly makes the lining erosion aggravation, and reduce work-ing life;
The 4th step: the 3rd stage, when blowing oxygen quantity reaches whole oxygen-supplying amounts and finishes decarburization, add reductive agent ferrosilicon 5～25kg/t and carry out restoring operation, concrete input amount can be calculated according to following formula;
W
The oxygen amount of oxidation Cr=W
Total O2-(W
Take off C oxygen amount+ W
Take off Si oxygen amount)
W
The reduction ferrosilicon=W
The oxygen amount of oxidation Cr* 1.25 ÷ Si%
Ferrosilicon
The 5th step: reduction is carried out desulfurization operations after finishing, and the lime, the 6～15kg/ ton steel fluorite that add 10～20kg/ ton steel carry out desulfurization.Carry out molten steel component fine setting, tap after meeting ingredient standard.
Wherein, oxygen supply control in the described smelting process, the ratio control of oxygen and rare gas element sees Table 3 (AOD blow pattern):
Table 3
Parameter designing is set according to AOD " decarburization and cr yield " principle in the table.Oxygen and rare gas element ratio control purpose are that the oxidation of control chromium drops to minimum level, improve the recovery rate of chromium metal.In the 1st stage, do not add ferrochrome, be to avoid the selective oxidation of Cr-C, improve oxygen supply intensity to greatest extent, accelerate decarbonization rate.When bath temperature during greater than 1600 ℃, add ferrochrome again, at this moment, reduce the oxidation of chromium, the raising oxygen utilization rate because the temperature height can guarantee that oxygen combines with carbon.
AOD " decarburization and cr yield " principle is set forth: well-known, under certain temperature and CO partial pressure conditions, Cr is to O
2Avidity be better than C, make the Cr in the stainless steel molten bath that preferential C is oxidized, C to be dropped to very difficult that stainless steel target C content (0.02%～0.08%) just becomes like this.In order to realize the purpose of decarburization and cr yield, at AOD stove carbon period initial stage, O
2And Ar (N
2) mixed gas, by the nozzle of stove lower sides, part oxygen then is blown into from the top rifle.Because the present invention adopts the full molten iron smelting of AOD, is molten iron fully, therefore also there is not the problem of decarburization and cr yield in the molten bath.According to this point, we Chrome metal powder is a large amount of drop into before, consider to strengthen to the oxygen supply ratio, particularly AOD top oxygen rifle of iron bath oxygen-supplying amount, accelerate decarbonization rate.But when beginning to drop into ferrochrome, because the content of chromium heightens in the molten bath, will consider how to guarantee to reduce the oxidation of chromium, decarburization to greatest extent mainly reduces the oxidation (more than 1580 ℃) of chromium by controlled temperature.The concrete oxygen-supplying amount in each stage can calculate according to prior art.
The present invention compared with prior art, have following advantage: 1) impurity element is controlled.Adopt overall height stove molten iron smelting, avoided stainless molten steel to be subjected to the quality influence of impure steel scrap, the trace element that Cu, Ni, Sn, Pb, As etc. have a significant effect to the stainless steel quality can be controlled in the extremely low scope, even can ignore, greatly reduce the difficulty of smelting the high cleanliness austenitic stainless steel.2) [P] is effectively controlled.Because do not have the pollution of steel scrap, finished product [P] can reach below 0.025% more like a cork, contain that [P] is low to help improving stainless corrosion resistance nature, improve stainless quality product.3) cost advantage.Because the technology that adopts AOD directly to smelt, mother liquor of stainless steel that need not electrosmelting (slightly make steel water) is like this in common process, to be saved by the cost that electric furnace produces, such as electric energy saving, power shortages now, its generation be not only the direct economic benefit of enterprise just; The saving of the electric furnace liner cost of anti-the material, avoiding of consumption such as goods, materials and equipments, equipment, electrode also is a very considerable income.
Embodiment
Below be specifying of the embodiment of the invention 1-3.
Embodiment 1
The molten iron condition:
Hot metal composition: C 2.98%, Mn 0.03%, and Si 0.00%, and S 0.028%, and P 0.010%;
Molten iron temperature: 1224 ℃, weight of molten iron: 91 tons;
Converting process:
Add Si-Fe 15kg/t during the blowing beginning, graphite (coke) 40kg/t heats up;
Drop into 90% of total nickel amount in the 1st stage, the metallic nickel of about 70kg/t.
When accumulative total reaches oxygen-supplying amount 4500Nm
3The time, the 1st stage finished; Recording temperature is 1600 ℃.
Molten steel composition saw Table 1-1 when the 1st stage finished:
Table 1-1
The 2nd stage began the speed with 2 tons/minute, added ferrochrome 34000kg continuously, and dropping into the beginning temperature is 1680 ℃.
At the main blowing bundle in the 2nd stage, recording C is 0.45wt%.
Molten steel composition saw Table 1-2 when the 2nd stage dynamic 3 finished:
Table 1-2
Liquid steel temperature when decarburization finishes: 1725 ℃;
The blowing pattern sees Table 1-3
Table 1-3 Nm
3/ min
Reduction and desulfurization:
Adding reductive agent ferrosilicon 2548kg reduces;
Reduction is carried out desulfurization operations after finishing, and the lime, the 1200kg fluorite that add 1700kg carry out desulfurization.
Go out composition of steel and see Table 1-4:
Table 1-4
Tapping liquid steel temperature: 1632 ℃ of tapping molten steel weight: 132 tons
Embodiment 2
The molten iron condition:
Hot metal composition: C 2.91%, Mn 0.03%, and Si 0.00%, and S 0.0321%, and P 0.006%;
Molten iron temperature: 1243 ℃, weight of molten iron: 86.6 tons;
Converting process:
Add Si-Fe 30kg/t during the blowing beginning, graphite (coke) 20kg/t heats up;
Drop into 95% of total nickel amount in the 1st stage, the metallic nickel of about 76kg/t.
Accumulative total reaches oxygen-supplying amount 5000Nm
3The 1st stage finished; Temperature is 1700 ℃.
At the main blowing bundle in the 2nd stage, recording C is 0.56wt%.
Molten steel composition saw Table 2-1 when the 2nd stage dynamic 3 finished:
Table 2-1
The 2nd stage began the speed with 2.3 tons/minute, added ferrochrome 31000kg continuously, and dropping into the beginning temperature is 1700 ℃.
Molten steel composition saw Table 2-2 when the decarburization of the 2nd stage finished:
Table 2-2
Liquid steel temperature when decarburization finishes: 1730 ℃;
The blowing pattern sees Table 2-3:
Table 2-3 Nm
3/ min
Reduction and desulfurization:
Adding reductive agent ferrosilicon 3000kg reduces;
Reduction is carried out desulfurization operations after finishing, and the lime, the 2000kg fluorite that add 2000kg carry out desulfurization.
Go out composition of steel and see Table 2-4:
Table 2-4
Tapping liquid steel temperature: 1650 ℃ of tapping molten steel weight: 125 tons
Embodiment 3
The molten iron condition:
Hot metal composition: hot metal composition: C 2.83%, Mn 0.03%, and Si 0.00%, and S 0.010%, P0.007%;
Molten iron temperature: 1154 ℃, weight of molten iron: 85 tons
Embodiment 3 converting processes:
Add Si-Fe 20kg/t during the blowing beginning, graphite (coke) 30kg/t heats up;
Drop into 100% of total nickel amount in the 1st stage, the metallic nickel of about 85kg/t.
Accumulative total reaches oxygen-supplying amount 5500Nm
3The 1st stage finished; Temperature is 1668 ℃.
At the main blowing bundle in the 2nd stage, recording C is 0.65wt%.
Molten steel composition saw Table 3-1 when the 2nd stage dynamic 3 finished:
Table 3-1
The 2nd stage began the speed with 3 tons/minute, added ferrochrome 32400kg continuously, and dropping into the beginning temperature is 1720 ℃.
Molten steel composition saw Table 3-2 when the decarburization of the 2nd stage finished:
Table 3-2
Liquid steel temperature when decarburization finishes: 1680 ℃
The blowing pattern sees Table 3-3:
Table 3-3 Nm
3/ min
Reduction and desulfurization:
Adding reductive agent ferrosilicon 3000kg reduces;
Reduction is carried out desulfurization operations after finishing, and the lime, the 1210kg fluorite that add 1528kg carry out desulfurization.
Go out composition of steel and see Table 3-4:
Table 3-4
The tapping liquid steel temperature: 1626 ℃, tapping molten steel weight: 129 tons.
As everyone knows, adopt full molten iron smelting austenitic stainless steel, its thermal equilibrium control is very difficult and since this point worldwide smelting stainless steel all adopt mother liquor of stainless steel (slightly make steel water) that steel scrap becomes certain ingredients and temperature by furnace melting to carry out the technology of Decarburising and refining to AOD again.Even adopt blast-melted (behind the dephosphorization), also must and steel scrap collocation use and in electric furnace, be fused into mother liquor of stainless steel (slightly make steel water), carry out Decarburising and refining through AOD again.
The present invention has made full use of the blast-melted C of containing height, the characteristics that chemical heat is high, and the flexible Application compensated technology, stable control bath temperature and reasonable blowing pattern in converting process is controlled at the oxidation of Cr in the small range.
Claims (1)
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| CN102021480B (en) * | 2009-09-22 | 2013-05-15 | 宝山钢铁股份有限公司 | Manufacturing method of low-chromium ferritic stainless steel |
| CN101928804A (en) * | 2010-08-31 | 2010-12-29 | 振石集团东方特钢股份有限公司 | Production method of austenitic stainless steel |
| TW201400624A (en) * | 2012-06-28 | 2014-01-01 | Yieh United Steel Corp | Method for producing austenitic stainless steel with nickel and chromium ore |
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| CN105779698B (en) * | 2016-03-17 | 2018-01-09 | 周海彬 | The smelting process of inconel containing niobium |
| CN106916919B (en) * | 2017-04-20 | 2019-06-14 | 攀钢集团攀枝花钢铁研究院有限公司 | Smelting method for controlling stainless steel inclusions |
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