CN101705332A - Process for manufacturing stainless steel by using high-phosphorus nickel-chromium pig iron - Google Patents
Process for manufacturing stainless steel by using high-phosphorus nickel-chromium pig iron Download PDFInfo
- Publication number
- CN101705332A CN101705332A CN200810149836A CN200810149836A CN101705332A CN 101705332 A CN101705332 A CN 101705332A CN 200810149836 A CN200810149836 A CN 200810149836A CN 200810149836 A CN200810149836 A CN 200810149836A CN 101705332 A CN101705332 A CN 101705332A
- Authority
- CN
- China
- Prior art keywords
- energising
- oxygen
- amount
- blown
- molten steel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 229910052698 phosphorus Inorganic materials 0.000 title claims abstract description 55
- 229910000805 Pig iron Inorganic materials 0.000 title claims abstract description 53
- 239000011574 phosphorus Substances 0.000 title claims abstract description 53
- 229910018487 Ni—Cr Inorganic materials 0.000 title claims abstract description 52
- VNNRSPGTAMTISX-UHFFFAOYSA-N chromium nickel Chemical compound [Cr].[Ni] VNNRSPGTAMTISX-UHFFFAOYSA-N 0.000 title claims abstract description 52
- 239000010935 stainless steel Substances 0.000 title claims abstract description 19
- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 19
- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000004519 manufacturing process Methods 0.000 title abstract description 13
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 73
- 239000001301 oxygen Substances 0.000 claims abstract description 73
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 70
- 238000007670 refining Methods 0.000 claims abstract description 16
- 229910000831 Steel Inorganic materials 0.000 claims description 55
- 239000010959 steel Substances 0.000 claims description 55
- 239000002893 slag Substances 0.000 claims description 47
- 229910000975 Carbon steel Inorganic materials 0.000 claims description 24
- 239000010962 carbon steel Substances 0.000 claims description 24
- 238000005516 engineering process Methods 0.000 claims description 21
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 12
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 12
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims description 12
- 239000010436 fluorite Substances 0.000 claims description 12
- 239000004571 lime Substances 0.000 claims description 12
- 238000003756 stirring Methods 0.000 claims description 10
- 239000011651 chromium Substances 0.000 claims description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 8
- 230000002045 lasting effect Effects 0.000 claims description 4
- 229910052759 nickel Inorganic materials 0.000 claims description 4
- 150000002926 oxygen Chemical class 0.000 claims description 3
- 229910052804 chromium Inorganic materials 0.000 claims description 2
- 229910052802 copper Inorganic materials 0.000 claims description 2
- 229910052748 manganese Inorganic materials 0.000 claims description 2
- 229910052717 sulfur Inorganic materials 0.000 claims description 2
- 238000003723 Smelting Methods 0.000 abstract description 16
- 239000002994 raw material Substances 0.000 abstract description 14
- 238000007600 charging Methods 0.000 abstract description 11
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 abstract description 8
- 238000007664 blowing Methods 0.000 abstract description 5
- 238000011010 flushing procedure Methods 0.000 abstract 1
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 14
- 239000000203 mixture Substances 0.000 description 12
- 235000014347 soups Nutrition 0.000 description 11
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 6
- 241001062472 Stokellia anisodon Species 0.000 description 5
- 239000000956 alloy Substances 0.000 description 5
- 238000006477 desulfuration reaction Methods 0.000 description 5
- 229910045601 alloy Inorganic materials 0.000 description 4
- 238000005261 decarburization Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000010079 rubber tapping Methods 0.000 description 4
- 235000012255 calcium oxide Nutrition 0.000 description 3
- 239000000292 calcium oxide Substances 0.000 description 3
- 230000002950 deficient Effects 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 229910000599 Cr alloy Inorganic materials 0.000 description 1
- 229910000863 Ferronickel Inorganic materials 0.000 description 1
- 229910000990 Ni alloy Inorganic materials 0.000 description 1
- NJFMNPFATSYWHB-UHFFFAOYSA-N ac1l9hgr Chemical compound [Fe].[Fe] NJFMNPFATSYWHB-UHFFFAOYSA-N 0.000 description 1
- -1 and Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- BIJOYKCOMBZXAE-UHFFFAOYSA-N chromium iron nickel Chemical compound [Cr].[Fe].[Ni] BIJOYKCOMBZXAE-UHFFFAOYSA-N 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 235000000396 iron Nutrition 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- DPTATFGPDCLUTF-UHFFFAOYSA-N phosphanylidyneiron Chemical compound [Fe]#P DPTATFGPDCLUTF-UHFFFAOYSA-N 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
Classifications
-
- 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
Landscapes
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The invention relates to a process for manufacturing stainless steel by using high-phosphorus nickel-chromium pig iron, which comprises the steps of charging, electrification, oxygen blowing, flushing, refining and the like. By the process provided by the invention, high-phosphorus nickel-chromium pig iron is dephosphorized in an electric furnace, stainless steel is produced by smelting, the high-phosphorus nickel-chromium pig iron with low cost is adopted as a raw material, the manufacturing cost of each ton of stainless steel can be lowered by about 200 dollars, the use field of the raw material of the stainless steel can also be further expanded, and the nickel-chromium pig iron with high phosphorus content can be applied to the smelting production of the stainless steel in a large scale.
Description
Technical field
The present invention relates to a kind of is raw material with the high-phosphorus nickel-chromium pig iron, utilizes dephosphorizing technology to reduce phosphorus content, makes stainless processing method.
Background technology
Traditional stainless steel manufacturing process is that electric furnace utilizes stainless steel steel scrap, Ni alloy, Cr alloy etc. to fuse into molten steel to remove impurity at refining furnace, adjust composition, perhaps utilize the blast-melted alloy materials pattern that adds to smelt.
But along with constantly raising up of Ni price, new raw materials for metallurgy nickel-chromium pig iron has appearred in Chinese market, can partly replace pure nickel, ferronickel or waste stainless steel as nickeliferous stainless nickel source, makes stainless raw materials cost to reduce.But because higher without the nickel-chromium pig iron phosphorus content of dephosphorization, when being directly used in stainless steel smelting, usage quantity is subject to the upper limit requirement of phosphorus, can't large-scale application in stainless smelting.
Traditional nickel-chromium pig iron dephosphorization is mainly undertaken by oxidisability stove and reductibility stove, and at first the stream slag removes totally the phosphorus of oxidation after dephosphorization, desiliconization in the oxidisability stove, carries out desulfurization then in the reductibility stove.Make the cost much lower (200-400RMB/%Ni) of the more low-phosphorous nickel-chromium pig iron of price of high-phosphorus nickel-chromium pig iron like this.The technical scheme of some other employing high-phosphorus nickel-chromium pig iron iron and steel smelting is also disclosed at present, for example disclose the dephosphorizing method of a kind of low nickel chromium iron liquid or the pig iron in the Chinese patent application 200810054730.4, it is to adopt different dephosphorizing agents to make up to carry out dephosphorization.The disclosed technical scheme of this patent application need add more dephosphorizing agent, can increase the cost that utilizes high-phosphorus nickel-chromium pig iron to smelt to a certain extent.
Searching is carried out dephosphorization to high-phosphorus nickel-chromium pig iron, and is used for smelting the stainless Technology of manufacturing, and to save the Ni resource, reducing stainless cost is this area problem demanding prompt solution.
Summary of the invention
The technical problem to be solved in the present invention provides a kind ofly can directly use high-phosphorus nickel-chromium pig iron to carry out the technology of dephosphorization and smelting stainless steel in electric furnace, and this technology has the characteristics of comprehensive low cost of manufacture.
The invention provides a kind of use high-phosphorus nickel-chromium pig iron and make stainless technology, it may further comprise the steps:
In electric furnace, add the furnace charge that comprises high-phosphorus nickel-chromium pig iron, carbon steel and lime etc. the 1st time, the 1st Intake Quantity of furnace charge is the 50-60% of furnace capacity, wherein, the weight ratio of high-phosphorus nickel-chromium pig iron and carbon steel is (18-22): (1-4), the lime Intake Quantity accounts for the 6-15% of high-phosphorus nickel-chromium pig iron and carbon steel Intake Quantity sum; In furnace charge, high-phosphorus nickel-chromium pig iron and carbon steel are main raw material;
Carry out continuing for the 1st time energising, and be blown into oxygen the 1st time in electric furnace in continuing galvanization, it is 10-20Nm that the 1st time of oxygen is blown into total amount
3/ ton molten steel;
When the energising amount reaches 180-230KWh/ ton molten steel, stop to continue energising, this moment, the furnace charge of 60-80% melted, and helped the 2nd charging;
Continue for the 1st time after the energising end, using the furnace wall burner to be blown into oxygen in electric furnace stirs furnace charge (furnace charge of this moment substantially has been melted into molten steel), when stirring, switch on and the operation of the 1st stream slag, wherein, furnace wall burner oxygen blast and energising are for being interrupted operation, and the energising of this moment can be called the 1st time and be interrupted energising;
In electric furnace, pack into for the 2nd time and comprise the furnace charge of high-phosphorus nickel-chromium pig iron, carbon steel and lime etc., the 2nd Intake Quantity of furnace charge is the 40-50% of furnace capacity, wherein, the weight ratio of high-phosphorus nickel-chromium pig iron and carbon steel is (30-55): 1, and the 1st Intake Quantity and the 2nd Intake Quantity sum of lime are 100kg-200kg/ ton molten steel;
Carry out continuing for the 2nd time energising, can in stove, be blown into oxygen the 2nd time simultaneously, and to control the amount of oxygen that is blown into for the 1st time and the 2nd time be 45Nm earlier with middle gear energising after the starting the arc
3-75Nm
3/ ton molten steel;
After reaching 50-120KWh/ ton molten steel, the energising amount stops energising, switch on low-grade location then, using the furnace wall burner to be blown into oxygen in electric furnace stirs furnace charge (furnace charge of this moment substantially has been melted into molten steel), when stirring, switch on and flow the slag operation, wherein, furnace wall oxygen blast and energising are the interruption operation, and the energising of this moment also can be called the 2nd time and be interrupted energising;
After the P of molten steel in electric furnace content is smaller or equal to 400ppm, molten steel is skimmed, carry out refining and produce stainless steel.
According to concrete technical scheme of the present invention, carbon steel of the present invention can be the steel scrap that reclaims, and add a certain amount of carbon steel and help the fire door oxygen gun blowing, and carbon steel can play the effect of conduction in electric furnace.
The add-on of lime is decided according to main raw material Intake Quantity and composition, and about the 6-15% of a chances are Intake Quantity of main raw material (being high-phosphorus nickel-chromium pig iron and carbon steel), this mainly is for slag making in advance, protects body of heater simultaneously, helps the carrying out of smelting technology.
According to concrete technical scheme of the present invention, the 1st oxygen blast can begin to carry out when the energising amount reaches in the scope of 90-130KWh/ ton molten steel, and, oxygen blow duration may be controlled to about 6-12 minute, the 1st oxygen blast lasts till the end of job of the 1st stream slag always, and the oxygen blast operation can adopt the oxygen blown mode of fire door to carry out.
According to concrete technical scheme of the present invention, in the 1st galvanization, continue for the 1st time to bring into use furnace wall burner oxygen blast after energising finishes, the oxygen amount of being blown into is no more than 2Nm
3/ ton molten steel, this oxygen amount of being blown into is calculated and is blown into total amount 10-20Nm the 1st time at above-mentioned oxygen
3Within/ton the molten steel.Utilizing the oxygen blown while of furnace wall burner, to switch on, and guarantee that total electric weight of the 1st energising is a 190-240KWh/ ton molten steel, this total electric weight comprises the energising amount of the 1st lasting energising and the energising amount that the 1st time is interrupted energising.
According to concrete technical scheme of the present invention, the 2nd energising can be with middle gear energising 3-10 minute after the starting the arc, the energising amount stops after reaching 50-120KWh/ ton molten steel, switch on low-grade location according to the stove internal state then, begin to stir operation simultaneously, total energising amount of the 2nd energising is controlled at 120-180KWh/ ton molten steel, comprises the energising amount of the 2nd lasting energising and the energising amount that the 2nd time is interrupted energising.
According to concrete technical scheme of the present invention, the 2nd oxygen blast carried out when the 2nd energising beginning simultaneously, and the oxygen of the 2nd fire door oxygen gun blowing is blown into total amount can be controlled at 30-40Nm
3About/ton molten steel, guarantee that the 1st oxygen blast and the 2nd oxygen blown total blowing oxygen quantity are 45Nm
3-75Nm
3/ ton molten steel; And in the 2nd galvanization, the stirring of furnace wall burner and oxygen blast operation are carried out simultaneously, and total blowing oxygen quantity of furnace wall burner had better not surpass 8Nm
3/ ton molten steel is blown into too much oxygen and corrodes excessive to the anti-material of body of heater.
Finish after the above-mentioned steps, can analyze its phosphorus content, when phosphorus content is less than or equal to 400ppm, confirm the dephosphorization success, just molten steel can be gone out soup to furnace inner sampling.
In the specific operation process of technology provided by the invention, when flowing the slag operation, should slag be flow to end, wherein, when carrying out the 1st stream slag operation, the stream quantity of slag is approximately the 5-20% of the 1st Intake Quantity of main raw material, and during the 2nd stream slag operation, the stream quantity of slag is approximately the 25-50% of the 1st Intake Quantity of main raw material.
Simultaneously, according to slag state in the stove, if desired can be by dropping into the fluorite slag, to improve the flowability of slag, being beneficial to slag is drained off only. the stove internal state mainly is meant: observe the flow state of slag in the stove, as run into mobile relatively poorly drop into maybe can't flow slag the time, the input amount of fluorite is judged according to flowability, usually, the otal investment of twice in fluorite may be controlled to 2.0 tons/below the stove; Further, can the fluorite add-on when at every turn flowing the slag operation be controlled to be 1.0 tons/below the stove.
After molten soup is thoroughly skimmed fast, can be blended into the AOD refining furnace and carry out refining process.Refining furnace carries out conventional decarburization, desulfuration operations and drops into various alloy irons according to the tapping target component, taps after reaching target component and temperature requirement.
In technical scheme provided by the invention, the electric furnace energising is to make galvanization melting waste steel between electrode and the steel scrap to the certain voltage of electrode, divides different gears according to the different voltages that applied among the present invention, and the scope of concrete high, medium and low gear is as follows:
Low-grade location (below 7 grades): 650-755V, middle gear (8-13 shelves): 776-897V, high tap position (more than 14 grades): 925-1099V.
When calculating the add-on of raw material and oxygen etc. among the present invention, be meant and smelt the molten steel that obtains that it is that weight sum with high-phosphorus nickel-chromium pig iron that adds and carbon steel multiply by yield and obtains as calculating molten steel that benchmark adopted.Wherein, when adopting technology provided by the invention to smelt, its recovery rate is generally 80-95%.
Above-mentioned technology provided by the present invention is applicable to that the nickel-chromium pig iron with any high content of phosphorus comes smelting stainless steel, be particularly useful for having the high-phosphorus nickel-chromium pig iron of following composition, by weight percentage, its main component comprises: Ni:3.0%-15.0%, C≤4.5%, S≤0.04%, P:0.03%-0.100%, Cu≤0.1%, Si≤4.0%, Mn≤0.5%, Cr:1.0-5.0%, surplus Fe.
Technology provided by the invention, in electric furnace, high-phosphorus nickel-chromium pig iron is carried out dephosphorization, and smelt and produce stainless steel, used the low price high-phosphorus nickel-chromium pig iron as raw material, stainless manufacturing cost per ton is descended about 200 dollars, and further expanded the use field of stainless steel raw material, make the nickel-chromium pig iron of high content of phosphorus can be applied to stainless smelting production on a large scale.
Embodiment
Below describe the present invention program's enforcement and the beneficial effect that is had in detail by specific embodiment, but but can not form any qualification to practical range of the present invention.
The heat size of the electric furnace that is adopted in the embodiments of the invention is 140 tons, and the electric quantity data among the embodiment all is the accumulative total numerical value of counting since the 1st energising.
Embodiment 1, utilize electric furnace high-phosphorus nickel-chromium pig iron to be carried out the production technique of dephosphorization and smelting stainless steel
1, pack into the main component of high-phosphorus nickel-chromium pig iron of electric furnace is as shown in table 1.
Table 1:(weight percent)
| Composition | ??C | ??Si | ??Cr | ??Ni | ??S | ??P |
| Content | ??3.22％ | ??2.65％ | ??2.85％ | ??5.09％ | ??0.082％ | ??0.078％ |
2,1 charging of electric furnace: high-phosphorus nickel-chromium pig iron 60ton, general carbon steel 9ton; In stove, drop into 7146Kg unslaked lime by high hopper in batches simultaneously.
3, for dephosphorization, the energising of electric furnace 1 defective material is converted to high tap position then and is energized to 7986KWh for 15 grades from 7 grades of beginnings of low-grade location starting the arc energising 3987KWh, rolls back 7 grades again and is energized to 18677KWh, stops energising.
4, when the energising amount probably reaches 10650KWh, begin to utilize fire door oxygen rifle to be blown into 1574Nm
3
5, energising amount reaches after the 18677KWh, according to bits state in the stove, drops into the fluorite slag, and uses burner oxygen blast pattern in furnace wall to be blown into oxygen 100Nm
3Molten steel is stirred, and the while is with 7 grades of energising 2000KWh and flow the slag operation, and the stream quantity of slag is 8.3Ton, after the end of job of stream slag, prepares 2 chargings.
6,2 chargings of electric furnace: high-phosphorus nickel-chromium pig iron 50ton, general carbon steel 1ton, and beginning drops into lime 5731kg in batches in stove.
7, be energized to 22973KWh with low-grade 7 grades of starting the arc equally, go to 15 grades then and be energized to 25432KWh, use 7 grades to be energized to 30387KWh then, stop to continue energising.
8, when beginning to switch on, step 7 utilize fire door oxygen rifle in stove, to be blown into oxygen 3257Nm
3(about 51 minutes).
9, after step 7 stops to continue energising,, drop into the flowability that fluorite (dropping into 1.8 tons in the step 5 and 9 altogether) increases slag according to bits state in the stove; And when being interrupted energising with 3 grades, (step 5 and 9 twice furnace wall burner oxygen blast are blown into oxygen 751Nm altogether to use furnace wall burner oxygen blast
3) molten steel is stirred, and flowing the slag operation, the stream quantity of slag is 18Ton, goes out soup after the end of job; Wherein, the total electric weight in the technological process is 38617KWh.
10, it is as shown in table 2 to go out the main component of molten steel of soup.
Table 2 (weight percent)
| Composition | ??C | ??Si | ??Cr | ??Ni | ??S | ??P |
| Content | ??0.41％ | ??0.04％ | ??3.56％ | ??5.43％ | ??0.123％ | ??0.04％ |
The data of contrast table 1 and table 2, P content has reduced 380ppm as can be seen.
11, after molten soup is thoroughly skimmed fast, be blended into the AOD refining furnace and carry out refining process.Refining furnace carries out decarburization, desulfuration operations and drops into various alloy iron 48852Kg according to the tapping target component, taps after smelting 91min, and P content is 0.037% in the composition of the final steel that obtains.
Embodiment 2, utilize electric furnace high-phosphorus nickel-chromium pig iron to be carried out the production technique of dephosphorization and smelting stainless steel
1, pack into the main component of high-phosphorus nickel-chromium pig iron of electric furnace is as shown in table 3.
Table 3:(weight percent)
| Composition | ??C | ??Si | ??Cr | ??Ni | ??S | ??P |
| Content | ??3.15％ | ??2.32％ | ??2.22％ | ??7.55％ | ??0.172％ | ??0.062％ |
2,1 charging of electric furnace: high-phosphorus nickel-chromium pig iron 60ton, general carbon steel 8.5ton drops into 5533Kg unslaked lime by high hopper simultaneously in batches in stove.
3, for dephosphorization, the energising of electric furnace 1 defective material is converted to high tap position then and is energized to 18930KWh for 15 grades from 7 grades of beginnings of low-grade location starting the arc energising 5463KWh, rolls back 7 grades again and is energized to 18554KWh, stops energising.
4, when the energising amount probably reaches 10500KWh, begin to utilize fire door oxygen rifle to be blown into 1385Nm
3
5, energising amount reaches after the 18554KWh, according to bits state in the stove, drops into the fluorite slag, and uses burner oxygen blast pattern in furnace wall to be blown into oxygen 200Nm
3Molten steel is stirred, simultaneously with 7 grades of energising 1800KWh, and flow the slag operation, the stream quantity of slag is 9Ton, after the end of job of stream slag, prepares 2 chargings.
6,2 chargings of electric furnace: high-phosphorus nickel-chromium pig iron 50ton, general carbon steel 1ton, and beginning drops into lime 5471kg in batches in stove.
7, be energized to 23425KWh with low-grade 7 grades of starting the arc equally, go to 11 grades then and be energized to 31477KWh, stop energising.
8, when step 7 begins to switch on, utilize fire door oxygen rifle in stove, to be blown into oxygen 3858Nm
3(about 45 minutes).
9, after step 7 stops energising,, drop into the flowability that fluorite (dropping into 0.8 ton in the step 5 and 9 altogether) increases slag according to bits state in the stove; And when being interrupted energising with 7 grades, (step 5 and 9 twice furnace wall burner oxygen blast are blown into oxygen 677Nm altogether to use furnace wall burner oxygen blast
3) molten steel is stirred, and flowing the slag operation, the stream quantity of slag is 15Ton, goes out soup after the end of job; Wherein, the total electric weight in the technological process is 35866KWh.
10, it is as shown in table 4 to go out the main component of molten steel of soup.
Table 4:(weight percent)
| Composition | ??C | ??Si | ??Cr | ??Ni | ??S | ??P |
| Content | ??0.04％ | ??0.02％ | ??0.71％ | ??7.72％ | ??0.11％ | ??0.014％ |
The data of contrast table 3 and table 4 as can be seen, P content has reduced 480ppm.
11, after molten soup is thoroughly skimmed fast, be blended into the AOD refining furnace and carry out refining process.Refining furnace carries out decarburization, desulfuration operations and drops into various alloy iron 62794Kg according to the tapping target component, taps after smelting 82min, and P content is 0.016% in the composition of the final steel that obtains.
Embodiment 3, utilize electric furnace high-phosphorus nickel-chromium pig iron to be carried out the production technique of dephosphorization and smelting stainless steel
1, pack into the main component of high-phosphorus nickel-chromium pig iron of electric furnace is as shown in table 5.
Table 5:(weight percent)
| Composition | ??C | ??Si | ??Cr | ??Ni | ??S | ??P |
| Content | ??2.62％ | ??2.93％ | ??2.11％ | ??8.84％ | ??0.103％ | ??0.057％ |
2,1 charging of electric furnace: high-phosphorus nickel-chromium pig iron 60ton, general carbon steel 8ton.
3, for dephosphorization, electric furnace 1 defective material energising is converted to high tap position then and is energized to 17943KWh for 15 grades from 7 grades of beginnings of low-grade location starting the arc energising 5802KWh, rolls back 7 grades again and is energized to 18019KWh and stops energising.
4, when probably reaching 11000KWh, the energising amount begin to utilize fire door oxygen rifle to be blown into 1354Nm
3
In stove, drop into 5568Kg unslaked lime by high hopper in batches when 5, the starting the arc is switched on; The energising amount probably reaches after the 18019KWh, according to bits state in the stove, drops into the fluorite slag, and uses burner oxygen blast pattern in furnace wall to be blown into oxygen 197Nm
3Molten steel is stirred, and the while is with 7 grades of energising 2000KWh and flow the slag operation, and the stream quantity of slag is 11Ton, after the end of job of stream slag, prepares 2 chargings.
6,2 chargings of electric furnace: high-phosphorus nickel-chromium pig iron 50ton, general carbon steel 1.6ton, and beginning drops into lime 7426kg in batches in stove.
7, be energized to 21887KWh with low-grade 7 grades of starting the arc equally, go to 15 grades then and be energized to 25055KWh, use 3 grades to be energized to 27638KWh and to stop energising then.
8, when beginning to switch on, step 7 utilize fire door oxygen rifle in stove, to be blown into oxygen 3859Nm
3
9, after step 7 stops energising, according to bits state in the stove, dropping into fluorite (dropping into 0.8 ton in the step 5 and 9 altogether) increases the flowability of slag, and when being interrupted energising with 7 grades, (step 5 and 9 twice furnace wall burner oxygen blast are blown into oxygen 463Nm altogether to use furnace wall burner oxygen blast
3) molten steel is stirred, and flowing the slag operation, the stream quantity of slag is 20Ton, goes out soup after the end of job; Wherein, the total electric weight in the technological process is 34111KWh.
10, it is as shown in table 6 to go out the main component of molten steel of soup.
Table 6:(weight percent)
| Composition | ??C | ??Si | ??Cr | ??Ni | ??S | ??P |
| Content | ??0.07％ | ??0.01％ | ??1.05％ | ??9.68％ | ??0.1％ | ??0.014％ |
The data of contrast table 5 and table 6 as can be seen, P content has reduced 430ppm.
11, after molten soup is thoroughly skimmed fast, be blended into the AOD refining furnace and carry out refining process.Refining furnace carries out decarburization, desulfuration operations and drops into various alloy iron 48789Kg according to the tapping target component, taps after smelting 86min, and P content is 0.021% in the composition of the final steel that obtains.
In the above-described embodiments, having used at a low price, high-phosphorus nickel-chromium pig iron according to calculating, can make the manufacturing cost of molten steel per ton descend about 200 dollars as raw material.
Claims (9)
1. one kind is used high-phosphorus nickel-chromium pig iron to make stainless technology, and it may further comprise the steps:
In electric furnace, add the furnace charge that comprises high-phosphorus nickel-chromium pig iron, carbon steel and lime the 1st time, the 1st Intake Quantity of furnace charge is the 50-60% of furnace capacity, wherein, the weight ratio of high-phosphorus nickel-chromium pig iron and carbon steel is (18-22): (1-4), the 1st Intake Quantity of lime accounts for the 6-15% of high-phosphorus nickel-chromium pig iron and carbon steel Intake Quantity sum;
Carry out continuing for the 1st time energising, and be blown into oxygen the 1st time in electric furnace in continuing galvanization, it is 10-20Nm that the 1st time of oxygen is blown into total amount
3/ ton molten steel; When the energising amount reaches 180-230KWh/ ton molten steel, stop to continue energising, using the furnace wall burner to be blown into oxygen in electric furnace stirs furnace charge, when stirring, switch on and the operation of the 1st stream slag, wherein, furnace wall burner oxygen blast is the interruption operation with energising, and total energising amount of the 1st energising (comprise the energising amount of the 1st lasting energising and be interrupted the energising amount of switching on) is 190-240KWh/ ton molten steel;
In electric furnace, pack into for the 2nd time and comprise the furnace charge of high-phosphorus nickel-chromium pig iron, carbon steel and lime, the 2nd Intake Quantity of furnace charge is the 40-50% of furnace capacity, wherein, the weight ratio of high-phosphorus nickel-chromium pig iron and carbon steel is (30-55): 1, and the 1st Intake Quantity and the 2nd Intake Quantity sum of lime are 100kg-200kg/ ton molten steel;
Carry out continuing for the 2nd time energising, be blown into oxygen the 2nd time in stove simultaneously, the amount of oxygen that is blown into for the 1st time and the 2nd time is 45Nm
3-75Nm
3/ ton molten steel; When the energising amount reaches 50-120KWh/ ton molten steel, stop to continue energising, using the furnace wall burner to be blown into oxygen in electric furnace stirs furnace charge, when stirring, switch on and the operation of the 2nd stream slag, wherein, furnace wall burner oxygen blast and energising are the interruption operation, and total energising amount of the 2nd energising is a 120-180KWh/ ton molten steel, comprise the energising amount of the 2nd lasting energising and the energising amount of being interrupted energising;
After the P of molten steel in electric furnace content is smaller or equal to 400ppm, molten steel is skimmed, carry out refining and produce stainless steel.
2. technology as claimed in claim 1 wherein, is blown into oxygen for the 1st time and begins to carry out when the energising amount that continues energising for the 1st time reaches the scope of 90-130KWh/ ton molten steel in electric furnace.
3. technology as claimed in claim 1, wherein, the oxygen blow duration when being blown into oxygen the 1st time in electric furnace is 6-12 minute.
4. technology as claimed in claim 1, wherein, the oxygen amount of being blown into when using furnace wall burner oxygen blast in the 1st galvanization is no more than 2Nm
3/ ton molten steel, this oxygen amount of being blown into is not calculated at described oxygen and is blown into total amount 10-20Nm the 1st time
3Within/ton the molten steel.
5. technology as claimed in claim 1, wherein, the oxygen amount of being blown into when using furnace wall burner oxygen blast in the 2nd galvanization is no more than 8Nm
3/ ton molten steel, this oxygen amount of being blown into is not calculated at described oxygen and is blown within the total amount for the 2nd time.
6. technology as claimed in claim 1, wherein, total energising amount of the 1st energising is a 190-240KWh/ ton molten steel, and total energising amount of the 2nd energising is a 120-180KWh/ ton molten steel, and described total energising amount comprises energising amount that continues energising and the energising amount of being interrupted energising.
7. technology as claimed in claim 1, wherein, the stream quantity of slag during the 1st stream slag is the 5-20% of the 1st Intake Quantity of high-phosphorus nickel-chromium pig iron and carbon steel, the stream quantity of slag during the 2nd stream slag is the 25-50% of the 2nd Intake Quantity of high-phosphorus nickel-chromium pig iron and carbon steel.
8. technology as claimed in claim 1 wherein, in the 1st time and the 2nd time stream slag process, drops into the fluorite slag respectively, the otal investment that fluorite is twice be 2.0 tons/below the stove.
9. technology as claimed in claim 1, wherein, the main component content of described high-phosphorus nickel-chromium pig iron is as follows, by weight percentage: C≤4.5%, Cr:1.0-5.0%, Si≤4.0%, S≤0.04%, P:0.03%-0.100%, Cu≤0.1%, Mn≤0.5%, Ni:3.0%-15.0%, surplus Fe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101498362A CN101705332B (en) | 2008-10-08 | 2008-10-08 | Process for manufacturing stainless steel by using high-phosphorus nickel-chromium pig iron |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101498362A CN101705332B (en) | 2008-10-08 | 2008-10-08 | Process for manufacturing stainless steel by using high-phosphorus nickel-chromium pig iron |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101705332A true CN101705332A (en) | 2010-05-12 |
| CN101705332B CN101705332B (en) | 2011-04-13 |
Family
ID=42375584
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008101498362A Expired - Fee Related CN101705332B (en) | 2008-10-08 | 2008-10-08 | Process for manufacturing stainless steel by using high-phosphorus nickel-chromium pig iron |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101705332B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102312033A (en) * | 2011-07-28 | 2012-01-11 | 山西太钢不锈钢股份有限公司 | Dephosphorization method of high-phosphorous chromium-nickel pig iron |
| CN104263880A (en) * | 2014-10-11 | 2015-01-07 | 中冶南方工程技术有限公司 | Stainless steel smelting method applicable to high-phosphorus raw material |
| CN107523760A (en) * | 2017-08-25 | 2017-12-29 | 张家港浦项不锈钢有限公司 | A kind of stainless steel of anti-printing and dyeing corrosion and its manufacture method and application |
| CN107587078A (en) * | 2017-08-25 | 2018-01-16 | 张家港浦项不锈钢有限公司 | A kind of corrosion-resistant 316L stainless steels and its manufacture method and application |
| CN112210639A (en) * | 2020-10-13 | 2021-01-12 | 上海电气上重铸锻有限公司 | Method for rapidly dephosphorizing by electric arc furnace |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB988617A (en) * | 1960-07-05 | 1965-04-07 | Yawata Iron & Steel Co | Production of high quality steel from nickeliferous lateritic ores |
| DE10215828B4 (en) * | 2002-04-10 | 2007-08-02 | Sms Demag Ag | Method and device for producing stainless steel, in particular chromium- or chromium-nickel-containing stainless steel |
| CN100577840C (en) * | 2007-02-02 | 2010-01-06 | 刘光火 | Technique for directly smelting stainless steel from dephosphorization blast furnace molten iron in furnace |
-
2008
- 2008-10-08 CN CN2008101498362A patent/CN101705332B/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102312033A (en) * | 2011-07-28 | 2012-01-11 | 山西太钢不锈钢股份有限公司 | Dephosphorization method of high-phosphorous chromium-nickel pig iron |
| CN104263880A (en) * | 2014-10-11 | 2015-01-07 | 中冶南方工程技术有限公司 | Stainless steel smelting method applicable to high-phosphorus raw material |
| CN104263880B (en) * | 2014-10-11 | 2016-06-01 | 中冶南方工程技术有限公司 | A kind of stainless steel smelting method adapting to high phosphorus raw material |
| CN107523760A (en) * | 2017-08-25 | 2017-12-29 | 张家港浦项不锈钢有限公司 | A kind of stainless steel of anti-printing and dyeing corrosion and its manufacture method and application |
| CN107587078A (en) * | 2017-08-25 | 2018-01-16 | 张家港浦项不锈钢有限公司 | A kind of corrosion-resistant 316L stainless steels and its manufacture method and application |
| CN107523760B (en) * | 2017-08-25 | 2020-06-30 | 浦项(张家港)不锈钢股份有限公司 | Printing and dyeing liquid corrosion resistant stainless steel and manufacturing method and application thereof |
| CN112210639A (en) * | 2020-10-13 | 2021-01-12 | 上海电气上重铸锻有限公司 | Method for rapidly dephosphorizing by electric arc furnace |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101705332B (en) | 2011-04-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101445845B (en) | Process for directly producing austenitic stainless steel by utilizing oxide nickel | |
| CN100485062C (en) | Method for smelting stainless steel using molten iron as raw material | |
| CN101993980B (en) | Method for smelting ultralow-phosphorous steel | |
| CN102776314B (en) | Smelting method of ultra-low phosphorus steel | |
| CN101705332B (en) | Process for manufacturing stainless steel by using high-phosphorus nickel-chromium pig iron | |
| CN100363508C (en) | Electric furnace to converter steel making production process | |
| CN102776313B (en) | Method for smelting high-phosphorus steel by low-temperature low-silicon molten iron in converter | |
| CN102304606A (en) | Slag former and slagging method for semisteel steelmaking | |
| CN103194564A (en) | Process for producing ultra-low phosphorus steel | |
| CN101294230B (en) | Duplex steelmaking technique of revolving furnace | |
| CN101643815A (en) | Vulcanization method for smelting high-sulfur stainless steel | |
| JP2006233264A (en) | Method for smelting high-chromium molten steel | |
| CN104313309A (en) | Technology and system for producing stainless steel by submerged arc furnace and AOD furnace duplex process | |
| CN102808061B (en) | Method for smelting nickel-containing steel by using low-nickel pig iron in converter | |
| CN102220448A (en) | Method for smelting uniform end-point molten steel composition with converter | |
| CN101619377B (en) | Deslagging and dephosphorizing method of electric stove | |
| CN102747192A (en) | Method for smelting ultralow-sulfur steel | |
| CN107868858A (en) | Production method of low-sulfur low-phosphorus steel | |
| CN101525718A (en) | Alloying process for stably and precisely controlling molybdenum content in steel | |
| CN109280734B (en) | Smelting method of medium and high alloy ultra-low phosphorus steel | |
| EP2039788A1 (en) | Dephosphorization method in the process of smelting ni-cr pig iron from a nickel oxide ore | |
| CN104178596B (en) | The technique of electric arc furnace Returning blowing keto technique smelting stainless steel | |
| CN101550465A (en) | Manganese-based fluxing agent for converter steelmaking and preparation method thereof | |
| CN103074543A (en) | Manufacturing technology of steel containing molybdenum | |
| CN103146981B (en) | Method for smelting ferritic stainless steel by dephosphorized molten iron |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address | ||
| CP03 | Change of name, title or address |
Address after: 215625 Yangtze River Metallurgical Industrial Park, Zhangjiagang City, Suzhou City, Jiangsu Province Patentee after: Puxiang (Zhangjiagang) Stainless Steel Co., Ltd. Address before: 215636 Daxin Section of Riverside Highway in Zhangjiagang City, Jiangsu Province Patentee before: Puxiang Stainless Steel Co Ltd, Shangjiagang |
|
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110413 Termination date: 20201008 |