CN103014239A - Production method of ER308L steel grade in 300 series stainless steel - Google Patents
Production method of ER308L steel grade in 300 series stainless steel Download PDFInfo
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- CN103014239A CN103014239A CN2012105760280A CN201210576028A CN103014239A CN 103014239 A CN103014239 A CN 103014239A CN 2012105760280 A CN2012105760280 A CN 2012105760280A CN 201210576028 A CN201210576028 A CN 201210576028A CN 103014239 A CN103014239 A CN 103014239A
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- decarburization
- oxygen
- er308l
- blown
- steel
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 22
- 239000010959 steel Substances 0.000 title claims abstract description 22
- 239000010935 stainless steel Substances 0.000 title claims abstract description 19
- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 19
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 11
- 238000005261 decarburization Methods 0.000 claims abstract description 49
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 34
- 238000000034 method Methods 0.000 claims abstract description 25
- 229910052742 iron Inorganic materials 0.000 claims abstract description 17
- 238000003723 Smelting Methods 0.000 claims abstract description 12
- 239000000203 mixture Substances 0.000 claims abstract description 10
- 239000007789 gas Substances 0.000 claims abstract description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 42
- 239000001301 oxygen Substances 0.000 claims description 42
- 229910052760 oxygen Inorganic materials 0.000 claims description 42
- 239000002893 slag Substances 0.000 claims description 25
- 238000007664 blowing Methods 0.000 claims description 21
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 11
- 229910045601 alloy Inorganic materials 0.000 claims description 11
- 239000000956 alloy Substances 0.000 claims description 11
- 229910052799 carbon Inorganic materials 0.000 claims description 11
- 229910000604 Ferrochrome Inorganic materials 0.000 claims description 10
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 10
- 238000005070 sampling Methods 0.000 claims description 9
- 238000004364 calculation method Methods 0.000 claims description 6
- 229910000519 Ferrosilicon Inorganic materials 0.000 claims description 5
- 238000005275 alloying Methods 0.000 claims description 5
- 239000004567 concrete Substances 0.000 claims description 5
- 229910052759 nickel Inorganic materials 0.000 claims description 5
- 229910000990 Ni alloy Inorganic materials 0.000 claims description 3
- UPHIPHFJVNKLMR-UHFFFAOYSA-N chromium iron Chemical compound [Cr].[Fe] UPHIPHFJVNKLMR-UHFFFAOYSA-N 0.000 claims description 3
- 238000002485 combustion reaction Methods 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 230000003647 oxidation Effects 0.000 claims description 3
- 238000007254 oxidation reaction Methods 0.000 claims description 3
- 229910052710 silicon Inorganic materials 0.000 claims description 3
- 239000010703 silicon Substances 0.000 claims description 3
- 238000005303 weighing Methods 0.000 claims description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims 10
- 229910052757 nitrogen Inorganic materials 0.000 claims 5
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims 4
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims 4
- 235000011941 Tilia x europaea Nutrition 0.000 claims 4
- 239000004571 lime Substances 0.000 claims 4
- 229910052786 argon Inorganic materials 0.000 claims 2
- 239000000463 material Substances 0.000 abstract description 3
- 229910000851 Alloy steel Inorganic materials 0.000 abstract description 2
- 238000009847 ladle furnace Methods 0.000 abstract 2
- VVTSZOCINPYFDP-UHFFFAOYSA-N [O].[Ar] Chemical compound [O].[Ar] VVTSZOCINPYFDP-UHFFFAOYSA-N 0.000 abstract 1
- 230000002860 competitive effect Effects 0.000 abstract 1
- 230000002708 enhancing effect Effects 0.000 abstract 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 239000011651 chromium Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 235000007926 Craterellus fallax Nutrition 0.000 description 1
- 240000007175 Datura inoxia Species 0.000 description 1
- 241001062472 Stokellia anisodon Species 0.000 description 1
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
Landscapes
- Treatment Of Steel In Its Molten State (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The invention relates to a production method of ER308L steel grade in 300 series stainless steel, belonging to the technical field of stainless steel smelting. The technical scheme is as follows: the production method comprises the steps of dephosphorizing station molten iron pretreatment, AOD (argon oxygen decarburization) furnace, LF (ladle furnace) and continuous caster. The smelting process is divided into seven stages, including decarburization 1, decarburization 2, decarburization 3, decarburization 4, decarburization 5, decarburization 6 and reduction; gas proportion, material addition proportion, charging rate, smelting process temperature and end point composition are controlled in every stage to implement smelting of the ER308L steel grade in 300 series stainless steel by molten iron direct addition into the AOD furnace (one-step method). The invention widens the stainless steel market, and satisfies the requirements of the customer for small batch of ER308L steel grade. On the premise of producing the ER308L steel grade without starting the electric furnace, the invention can also be popularized and used in smelting other high-alloy steel grades, thereby laying the foundation for enriching the products and enhancing the competitive power of the enterprise.
Description
Technical field
The present invention relates to a kind of 300 is the production method of ER308L steel grade in the stainless steel, belongs to the stainless steel smelting technical field.
Background technology
The ER308L steel grade is under the jurisdiction of stainless steel 300 series, owing to containing higher chromium (19.50-22.00%), nickel element (9.00-11.00%) and lower carbon (＜0.03%), smelting process need to be with addition of a large amount of alloys and slag charge, most stainless steel factories uses the pattern (two-step approach) of ' electric furnace+AOD stove ' to smelt both at home and abroad, directly convert the mode that the AOD stove is smelted if use molten iron, the high carbon ferro-chrome that all need with addition of composition, the alloys such as nickel, slag charge then all adds in the AOD stove, the gross weight of its interalloy just accounts for the 40%-50% of tap, cause furnace heat damaged huge, and can only rely on the mode of chromic oxide or adding ferrosilicon to carry out temperature raising in order to remedy heat, finally can produce temperature, composition is difficult to control, smelting cycle is long, the brick of anti-material loss is serious, finishing slag basicity is low, some row of the poor grade of steel quality are produced and product quality problem.
Summary of the invention
It is the production method of ER308L steel grade in the stainless steel that the object of the invention provides a kind of 300, widen stainless steel market, satisfy the client to the demand of ER308L steel grade short run, under the prerequisite that does not start electric furnace, produce the ER308L steel grade, solve the problems referred to above that exist in the background technology.
Technical scheme of the present invention is:
A kind of 300 is the production method of ER308L steel grade in the stainless steel, comprises dephosphorizing station hot metal pre process procedures, furnaceman's AOD order, furnaceman's LF order, continuous caster operation; Concrete operations technique is:
1. be 50 ± 1 tons of calculating according to tap, the combining target composition calculates the molten iron Intake Quantity simultaneously, and its Intake Quantity is controlled at 29 ± 2 tons, and computation process is as follows:
T
The molten iron Intake Quantity=(T
The target tap-∑ T
The target tap* ω
The alloying element target component/ ω
Principal element content in the alloy) * [1-(C+Si) %
Content in the molten iron];
2. top gun gun bit is fixed on 3.0 meters, increases the secondary combustion ratio to 10%-20%, utilizes simultaneously si content to generate heat to remedy the process temperature in early stage greater than Si element oxidation more in 1.5% the high-silicon chromium iron, and it is put forward top rifle temperature and is controlled at 1670-1700 ℃;
3. the nickel plate adds in two batches, adds the 45%-50% of gross weight before converting iron, and all the other add in decarburization latter stage, with control bath temperature in latter stage;
4. open to blow after 1 minute and begin to add high carbon ferro-chrome and slag charge, its feed rate is controlled at 0.4～1.2 ton/min, prevents temperature shock;
Temperature when 5. taking a sample according to the first time is adjusted decarburization stage blowing oxygen quantity, to guarantee that decarburization temperature in latter stage is controlled at 1670-1730 ℃, concrete blowing oxygen quantity is adjusted as follows: temperature during greater than 1730 ℃ decarburization do not carry out oxygen blast and directly skip, at 50-150m3, temperature is controlled at 150-200m3 less than 1680 o'clock blowing oxygen quantities to temperature at the 1680-1730 blowing oxygen quantity.
The terminal point Composition Control:
1. determine actual molten iron Intake Quantity by the overhead traveling crane Weighing system, calculate actual needed ferrochrome and nickelalloy add-on, calculation formula is as follows:
T
The alloy amount=T
The target tap* ω
The alloying element target component/ ω
Principal element content in the alloy
2. carry out sampling operation after top rifle oxygen blast finishes, in order to calculate and to regulate the blowing oxygen quantity in decarburization stage, calculation formula is Q
Blowing oxygen quantity=T
The molten steel amount* (C
Initial content-C
Target content)/CRE, the CRE reference value is 30%-50%;
3. carry out the sampling operation second time, utilize aforesaid method to calculate the blowing oxygen quantity in latter stage, the CRE reference value is 10%-15%, to reach the purpose of accurate control end point carbon composition;
4. reduction period at first reduces and dips in slag, sampling operation behind the 4min, according to slag color, the mobile comprehensive reducing slag quality of judging; The slag color is light green, green, only needs to continue reduction 4min; Slag is brown, black, then adds the following ferrosilicon of 200Kg or the following slag charge of 300Kg when rear 4min; Aforesaid operations is called ' 4+4 ' pattern.
Beneficial effect of the present invention is: gas ratio model, process reinforced opportunity and feed rate, the temperature control criterion etc. of the present invention by optimizing AOD each stage of stove, realize that it is ER308L steel grade in the stainless steel that molten iron is directly converted AOD stove (single stage method) smelting 300, having widened stainless steel 300 when recessed market, demand are few is market, satisfied customer demand, simultaneously this invention also can be promoted the use of when smelting other high alloy steel grades, the horn of plenty product, establish brand names, improve enterprise competitiveness and lay the foundation.
Embodiment
The present invention will be further described by the following examples.
A kind of 300 is the production method of ER308L steel grade in the stainless steel, and technical process sequentially comprises dephosphorizing station hot metal pre process procedures, furnaceman's AOD order, furnaceman's LF order, continuous caster operation.
The present invention is divided into decarburization 1, decarburization 2, decarburization 3, decarburization 4, decarburization 5, decarburization 6, seven stages of reduction with smelting process, each stage gas mixing ratio and feeding quantity part following table:
Annotate: alloy and slag charge are for adding separately the mass percent of total amount;
Decarburization 1,2 stages of decarburization:
Top gun gun bit is fixed on 3.0 meters, increases the secondary combustion ratio to 10%-20%, utilizes simultaneously si content to generate heat to remedy the process temperature in early stage greater than Si element oxidation more in 1.5% the high-silicon chromium iron, and it is put forward top rifle temperature and is controlled at 1670-1700 ℃;
The nickel plate adds in two batches, adds the 45%-50% of gross weight before converting iron, and all the other add in decarburization latter stage, with control bath temperature in latter stage;
Open to blow after 1 minute and begin to add high carbon ferro-chrome and slag charge, its feed rate is controlled at 0.4～1.2 ton/min, prevents temperature shock.
3 stages of decarburization:
Temperature when taking a sample according to the first time is adjusted 3 stage of decarburization blowing oxygen quantity, to guarantee that decarburization temperature in latter stage is controlled at 1670-1730 ℃, concrete blowing oxygen quantity is adjusted as follows: temperature during greater than 1730 ℃ decarburization 3 do not carry out oxygen blast and directly skip, at 50-150m3, temperature is controlled at 150-200m3 less than 1680 o'clock blowing oxygen quantities to temperature at the 1680-1730 blowing oxygen quantity.
Determine actual molten iron Intake Quantity by the overhead traveling crane Weighing system, calculate actual needed ferrochrome and nickelalloy add-on, calculation formula is as follows:
T
The alloy amount=T
The target tap* ω
The alloying element target component/ ω
Principal element content in the alloy
Decarburization 4,5 stages of decarburization:
Carry out sampling operation after top rifle oxygen blast finishes, in order to calculate and to regulate decarburization 4, the blowing oxygen quantity in 5 stages of decarburization, calculation formula is Q
Blowing oxygen quantity=T
The molten steel amount* (C
Initial content-C
Target content)/CRE, the CRE reference value is 30%-50%;
Decarburization 5 finish or decarburization 6 open blow～during 10min, carry out sampling operation second time, utilize aforesaid method calculating blowing oxygen quantity in latter stage, the CRE reference value is 10%-15%, to reach the purpose of accurate control end point carbon composition;
Use the poor and poor composite accounting of chromium of oxygen to calculate the add-on of reduction ferrosilicon, guarantee reduction effect and steel quality.
Reduction phase: at first reduce and dip in slag, sampling operation behind the 4min, according to slag color, the mobile comprehensive reducing slag quality of judging; The slag color is light green, green, only needs to continue reduction 4min; Slag is brown, black, then adds the following ferrosilicon of 200Kg or the following slag charge of 300Kg when rear 4min; Aforesaid operations is called ' 4+4 ' pattern.
Entering 29 tons of stove molten iron as example, as follows according to gas volume and the material add-on in each stage after above-mentioned the calculating:
Claims (4)
1. one kind 300 is the production method of ER308L steel grade in the stainless steel, it is characterized in that comprising dephosphorizing station hot metal pre process procedures, furnaceman's AOD order, furnaceman's LF order, continuous caster operation; Concrete operations technique is:
1. be 50 ± 1 tons of calculating according to tap, the combining target composition calculates the molten iron Intake Quantity simultaneously, and its Intake Quantity is controlled at 29 ± 2 tons, and computation process is as follows:
T
The molten iron Intake Quantity=(T
The target tap-∑ T
The target tap* ω
The alloying element target component/ ω
Principal element content in the alloy) * [1-(C+Si) %
Content in the molten iron];
2. top gun gun bit is fixed on 3.0 meters, increases the secondary combustion ratio to 10%-20%, utilizes simultaneously si content to generate heat to remedy the process temperature in early stage greater than Si element oxidation more in 1.5% the high-silicon chromium iron, and it is put forward top rifle temperature and is controlled at 1670-1700 ℃;
3. the nickel plate adds in two batches, adds the 45%-50% of gross weight before converting iron, and all the other add in decarburization latter stage, with control bath temperature in latter stage;
4. open to blow after 1 minute and begin to add high carbon ferro-chrome and slag charge, its feed rate is controlled at 0.4～1.2 ton/min;
Temperature when 5. taking a sample according to the first time is adjusted decarburization stage blowing oxygen quantity, to guarantee that decarburization temperature in latter stage is controlled at 1670-1730 ℃, concrete blowing oxygen quantity is adjusted as follows: temperature during greater than 1730 ℃ decarburization do not carry out oxygen blast and directly skip, at 50-150m3, temperature is controlled at 150-200m3 less than 1680 o'clock blowing oxygen quantities to temperature at the 1680-1730 blowing oxygen quantity.
2. according to claim 1 a kind of 300 is the production method of ER308L steel grade in the stainless steel, it is characterized in that the terminal point Composition Control:
1. determine actual molten iron Intake Quantity by the overhead traveling crane Weighing system, calculate actual needed ferrochrome and nickelalloy add-on, calculation formula is as follows:
T
The alloy amount=T
The target tap* ω
The alloying element target component/ ω
Principal element content in the alloy
2. carry out sampling operation after top rifle oxygen blast finishes, in order to calculate and to regulate the blowing oxygen quantity in decarburization stage, calculation formula is Q
Blowing oxygen quantity=T
The molten steel amount* (C
Initial content-C
Target content)/CRE, the CRE reference value is 30%-50%;
3. carry out the sampling operation second time, utilize aforesaid method to calculate the blowing oxygen quantity in latter stage, the CRE reference value is 10%-15%, to reach the purpose of accurate control end point carbon composition;
4. reduction period at first reduces and dips in slag, sampling operation behind the 4min, according to slag color, the mobile comprehensive reducing slag quality of judging; The slag color is light green, green, only needs to continue reduction 4min; Slag is brown, black, then adds the following ferrosilicon of 200Kg or the following slag charge of 300Kg when rear 4min; Aforesaid operations is called ' 4+4 ' pattern.
3. according to claim 1 and 2 a kind of 300 is the production method of ER308L steel grade in the stainless steel, it is characterized in that smelting process is divided into decarburization 1, decarburization 2, decarburization 3, decarburization 4, decarburization 5, decarburization 6, seven stages of reduction, each stage gas mixing ratio and feeding quantity part are:
1 stage of decarburization: top rifle oxygen flow 50 m3/min, side-blown oxygen flow 50m3/min, side-blown pipe core nitrogen flow 10m3/min, oxygen blast total amount 1500～1700m3, lime 30%, high carbon ferro-chrome 35%;
2 stages of decarburization: top rifle oxygen flow 50 m3/min, side-blown oxygen flow 50m3/min, side-blown pipe core nitrogen flow 10m3/min, oxygen blast total amount 1900～2100m3, lime 60%, high carbon ferro-chrome 65%;
3 stages of decarburization: side-blown oxygen flow 30m3/min, side-blown pipe core nitrogen flow 30m3/min, oxygen blast total amount 50～80m3, lime 10%;
4 stages of decarburization: side-blown oxygen flow 20m3/min, side-blown pipe core nitrogen flow 40m3/min, oxygen blast total amount 50～80m3;
5 stages of decarburization: side-blown oxygen flow 15m3/min, side-blown pipe core nitrogen flow 45m3/min, oxygen blast total amount 50～80m3;
6 stages of decarburization: side-blown oxygen flow 12m3/min, side-blown pipe core argon flow amount 48m3/min, oxygen blast total amount 200～250m3;
7 stages of decarburization: side-blown pipe core argon flow amount 45m3/min.
4. lime and high carbon ferro-chrome are for adding separately the mass percent of total amount.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210576028.0A CN103014239B (en) | 2012-12-27 | 2012-12-27 | Production method of ER308L steel grade in 300 series stainless steel |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210576028.0A CN103014239B (en) | 2012-12-27 | 2012-12-27 | Production method of ER308L steel grade in 300 series stainless steel |
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| CN103014239A true CN103014239A (en) | 2013-04-03 |
| CN103014239B CN103014239B (en) | 2014-07-30 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104195291A (en) * | 2014-08-14 | 2014-12-10 | 邢台钢铁有限责任公司 | One-step production method for high-manganese and high-nitrogen corrosion-resistant steel G6811 |
| CN107130188A (en) * | 2017-04-07 | 2017-09-05 | 邢台钢铁有限责任公司 | Welding ferritic stainless steel and its method for refining |
| CN107227424A (en) * | 2017-05-31 | 2017-10-03 | 中冶东方工程技术有限公司 | The smelting process of its smelting stainless steel of the smelting equipment and application of stainless steel |
| PL422666A1 (en) * | 2017-08-28 | 2019-03-11 | Instytut Metalurgii Żelaza im. Stanisława Staszica | Method for decarburization of steel |
| PL422668A1 (en) * | 2017-08-28 | 2019-03-11 | Instytut Metalurgii Żelaza im. Stanisława Staszica | Method for decarburization of steel |
| CN114752730A (en) * | 2022-05-18 | 2022-07-15 | 山西太钢不锈钢股份有限公司 | Method for improving AOD (argon oxygen decarburization) ignition success rate |
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| CN1876857A (en) * | 2005-06-11 | 2006-12-13 | 太原钢铁(集团)有限公司 | Method for smelting stainless steel using molten iron as raw material |
| CN101096723A (en) * | 2006-06-30 | 2008-01-02 | 宝山钢铁股份有限公司 | Method for AOD whole melted iron directly smelting austenitic stainless steel |
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2012
- 2012-12-27 CN CN201210576028.0A patent/CN103014239B/en not_active Expired - Fee Related
Patent Citations (3)
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| JPS56130418A (en) * | 1980-03-14 | 1981-10-13 | Nippon Steel Corp | Preventing method of molten stainless steel in aod refining from nitrogen absorption |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104195291A (en) * | 2014-08-14 | 2014-12-10 | 邢台钢铁有限责任公司 | One-step production method for high-manganese and high-nitrogen corrosion-resistant steel G6811 |
| CN104195291B (en) * | 2014-08-14 | 2016-03-02 | 邢台钢铁有限责任公司 | The method of One-step production high manganese and high nitrogen corrosion-resisting steel G6811 |
| CN107130188A (en) * | 2017-04-07 | 2017-09-05 | 邢台钢铁有限责任公司 | Welding ferritic stainless steel and its method for refining |
| CN107130188B (en) * | 2017-04-07 | 2019-02-19 | 邢台钢铁有限责任公司 | Welding ferritic stainless steel and its method for refining |
| CN107227424A (en) * | 2017-05-31 | 2017-10-03 | 中冶东方工程技术有限公司 | The smelting process of its smelting stainless steel of the smelting equipment and application of stainless steel |
| PL422666A1 (en) * | 2017-08-28 | 2019-03-11 | Instytut Metalurgii Żelaza im. Stanisława Staszica | Method for decarburization of steel |
| PL422668A1 (en) * | 2017-08-28 | 2019-03-11 | Instytut Metalurgii Żelaza im. Stanisława Staszica | Method for decarburization of steel |
| PL235191B1 (en) * | 2017-08-28 | 2020-06-01 | Inst Metalurgii Zelaza Im Stanislawa Staszica | Method for decarburization of steel |
| CN114752730A (en) * | 2022-05-18 | 2022-07-15 | 山西太钢不锈钢股份有限公司 | Method for improving AOD (argon oxygen decarburization) ignition success rate |
| CN114752730B (en) * | 2022-05-18 | 2023-03-21 | 山西太钢不锈钢股份有限公司 | Method for improving AOD (argon oxygen decarburization) ignition success rate |
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| Publication number | Publication date |
|---|---|
| CN103014239B (en) | 2014-07-30 |
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