CN106191375B - Seamless steel pipe titanium-containing austenitic stainless steel circular pipe blank continuous casting producing method - Google Patents
Seamless steel pipe titanium-containing austenitic stainless steel circular pipe blank continuous casting producing method Download PDFInfo
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- CN106191375B CN106191375B CN201610706438.0A CN201610706438A CN106191375B CN 106191375 B CN106191375 B CN 106191375B CN 201610706438 A CN201610706438 A CN 201610706438A CN 106191375 B CN106191375 B CN 106191375B
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/006—Continuous casting of metals, i.e. casting in indefinite lengths of tubes
Abstract
The invention discloses a kind of seamless steel pipe titanium-containing austenitic stainless steel circular pipe blank continuous casting producing method, comprise the following steps that：AOD is converted and is added 5 20kg/ ton steel carburant according to electric furnace steel tapping component before steel, it is ensured that AOD carbon contents at initial stage are not less than 2.0%；AOD oxygen decarburizations；Reduction and desulfurization：Add reduction by ferrosilicon and add lime and fluorite slag making desulfurization, skim after reduction and desulfurization in AOD furnace；Deep deoxidation；Tapping and Ti Alloying：Tap after deep deoxidation, ferrotianium is added with steel stream in tapping process；LF heats up；Calcium treatment：Silicon-calcium wire is fed to molten steel with wire feeder, pure calcium feed quantity is ton steel 0.2kg 0.8kg；Soft blow；Round billet continuous casting：After soft blow, ladle is moved to continuous casting station and is poured into a mould, and continuous casting circular tube blank is produced using round mold.The present invention not only realizes sequence casting, improves lumber recovery, and eliminates forging process, and production cost is low, high financial profit.
Description
Technical field
The invention belongs to the iron and steel smelting technology field of metallurgy industry, more particularly to a kind of seamless steel pipe titanium-containing austenitic
Stainless pipe base continuous casting producing method.
Background technology
At present, big cross section (Φ more than 150）Titaniferous stainless-steel seamless pipe uses the side of static ingot forging with circular pipe blank
Method produces.The method production seamless steel pipe circular pipe blank lumber recovery forged with static ingot is low, high processing costs.If directly
Seamless steel pipe continuous casting circular tube blank is produced with continuous casting process, not only improves lumber recovery, and saves forging cost, makes titaniferous not
Rust steel seamless steel tube production cost greatly reduces.
Ti is usually added into stainless steel as stabilizing element, to prevent the generation of intercrystalline corrosion.Ti is in austenite stainless
In steel Sensitized is prevented to form TiC, common product standard requires Ti/C primarily as stabilizing element>5.But Ti
There is stronger affinity with nitrogen and oxygen, easily form TiN in molten steel in smelting and casting process and TiO2 is mingled with, cause continuous casting
Nozzle clogging, as shown in Figure 1.Continuous casting sprue dross, molten steel, which can not be successfully, to be flowed into crystallizer, is caused casting process to reduce and is drawn
Speed, the mouth of a river blocks completely when serious, can only interrupt casting and melt down.At present, seamless steel pipe titaniferous stainless pipe base does not connect
Casting directly produces the report of round billet, is all to mold to produce steel ingot and be forged into circular pipe blank again.To find out its cause, because round billet section
Small, steel transportation amount is few, and the TiN and TiO2 that titaniferous stainless steel produces, which are mixed in continuous casting production process, to be easier to cause the mouth of a river completely stifled
Extremely continuous casting is caused to interrupt, casting sequence can not improve, and continuous casting cost remains high.
CN101121987A discloses a kind of titanium-containing austenitic stainless steel smelting process, in this method, in order to prevent TiN and
TiO2 is mingled with, and reduces the Ti content in molten steel, adds part Nb so that (0.5Nb+Ti)>6C, realizes Ti-Nb bistables.With
Although this method Ti-Nb bistables can avoid intercrystalline corrosion, the Ti contents in product do not reach product standard, belong to
New steel grade, when production standard steel grade and does not apply to.
102465229 A of CN disclose a kind of titaniferous stainless steel ferro-titanium method, are mixed in this method in AOD slags
Go out to after ladle, from new slag making and the strong deoxidation of aluminium is carried out again after first oxidisability clinker is extracted.Calcium treatment is used in combination after deoxidation
Ferrotianium carries out Ti Alloying.Must have special ladle slagging-off equipment with this method, for unspecial station of skimming factory simultaneously
It is inapplicable.
The content of the invention
The present invention is in order to solve above-mentioned defect existing in the prior art and deficiency, there is provided and a kind of technology difficulty is smaller,
It is easily mastered, the seamless steel pipe titanium-containing austenitic stainless steel circular pipe blank production method that product quality is stablized.
The main difficulty of titanium-containing austenitic stainless steel circular pipe blank continuous casting is that TiN and TiO2 is mixed in continuous casting intrusive mood
Mouth of a river inner wall dross causes continuous casting to interrupt.The present invention thinking be：
(1) control AOD is blended into C content in molten steel and is taken away to ensure to produce enough CO gases in decarbonizing process in molten steel
N reduces N content, reduces TiN；
(2) AOD endpoint carbon content reduced levels are controlled, meet Ti/C>Ti is controlled in relatively low water as far as possible on the premise of 5
It is flat；
(3) plus before titanium carry out strong deoxidation with deoxidant element aluminium more stronger than titanium, prevent the generation of TiO2 field trashes, and handled with this
To be modified the alumina inclusion brought by aluminium deoxidation.By above measure 1,2, water blocking mouthh can be mingled with to avoid TiN, pass through the above
Measure 3, can be mingled with water blocking mouthh so that titaniferous stainless steel continuous casting can smoothly complete to avoid oxide.
The concrete technical scheme of the present invention is as follows：A kind of seamless steel pipe titanium-containing austenitic stainless steel circular pipe blank continuous casting
Method, its process route are electric furnace crude molten steel → AOD stoves refining → LF ladle refinings → round billet continuous casting, are comprised the following steps that：
1）AOD is converted and is added 5-20kg/ tons of steel carburants according to electric furnace steel tapping component before steel, it is ensured that AOD carbon contents at initial stage are not
Less than 2.0%, while ensure that the crude steel coolant-temperature gage for being blended into AOD stoves is more than 1470 DEG C；
2）AOD oxygen decarburizations；
3）Reduction and desulfurization：Add reduction by ferrosilicon and add lime and fluorite slag making desulfurization, in AOD furnace after reduction and desulfurization
Inside skim；
4）Deep deoxidation；
5）Tapping and Ti Alloying：Tap after deep deoxidation, ferrotianium is added with steel stream in tapping process；
6）LF heats up；
7）Calcium treatment：Silicon-calcium wire is fed to molten steel with wire feeder, pure calcium feed quantity is ton steel 0.2kg-0.8kg；
8）Soft blow；
9）Round billet continuous casting：After soft blow, ladle is moved to continuous casting station and is poured into a mould, and is produced using round mold
Continuous casting circular tube blank.
Preferably, the step 2）In, aim carbon is controlled in %C≤0.025%；The step 4）In, ton steel adds in AOD
Enter 1-5kg aluminium ingots progress deep deoxidation and ton steel adds 20-30 kg pre-melted refining slags and refined.
Preferably, the step 3）In, skim in AOD furnace thorough, remained slag volume is less than ton steel 20kg.
Preferably, the step 4）In, aluminium content is controlled between 0.01%-0.03% in molten steel after addition aluminium ingot.
Preferably, the step 5）In, determined to add Ti content according to carbon content in molten steel, titanium addition is according to following public affairs
Formula calculates：
Titanium addition=molten steel amount * 5.5* (carbon content+follow-up carbon increasing amount in molten steel)/titanium recovery rate/titanium grade；
Wherein:For titanium recovery rate according to liquid steel temperature, aluminium content in steel, remaining quantity of slag factor is set to 60%-80%；
Follow-up carbon increasing amount is set to 0.005%-0.010% according to ladle state, LF processing times and heating-up time factor；
Preferably, the step 6）In, for molten steel by electric arc heated, temperature is raised to 1580 DEG C -1600 DEG C.
Preferably, the step 8）In, after Calcium treatment, ladle bottom carries out Argon by air brick and carries out soft stir
Mix, argon flow amount is controlled between ton steel 15L/min-20L/min, processing time 8-15min.
Preferably, the step 9）In, molten steel overheat control is at 35-45 DEG C in casting process and whole implementation is protected
Cast.
Preferably, which uses magnesia carbon brick as ladle lining.
The present invention is that titaniferous stainless pipe base is directly produced by continuous casting process, with traditional molding+forging technology
Production titaniferous stainless-steel seamless pipe is compared with circular pipe blank, and lumber recovery is high, production cost is low.
The seamless steel pipe of the present invention not only realizes sequence casting with titanium-containing austenitic stainless steel circular pipe blank production method, carries
High lumber recovery, and forging process is eliminated, product quality is suitable with the conventionally produced product come out, obtains considerable
Economic benefit.
The present invention and the conventional process techniques economic indicator table of comparisons
Brief description of the drawings
Fig. 1 is dross mouth of a river sectional schematic diagram.
Embodiment
With reference to embodiment, the present invention is described in further detail, but is not the limit to the scope of the present invention
System.
Embodiment 1
The steel grade that the present embodiment is smelted is 06Cr18Ni11Ti, and the capacity of AOD and LF refining furnace is 30 tons, the ladle used
For magnesia carbon brick ladle.
The percent mass proportioning of 06Cr18Ni11Ti components is in national standard：C ≤ 0.08 ； Si ≤ 1.00 ； Mn ≤
2.00 ； Cr 17.00-19.00 ；Ni 9.00-12.00 ； Ti ≥ 5*C ； P ≤ 0.045 ； S ≤ 0.030； N
≤ 0.10；
The present invention arrives the percent mass proportioning control of the component of the steel grade：
C ≤ 0.03 ； Si 0.30-0.75 ； Mn 0.80-1.50 ； Cr 17.00-18.00 ；
Ni 9.00-9.30 ； Ti 5*C-0.25 ； P ≤ 0.045 ； S ≤ 0.005； N ≤ 0.030.
Remaining is Fe and inevitable impurity.
Embodiment 2
The steel grade that the present embodiment is smelted is 0Cr18Ni9Ti, and the capacity of AOD and LF refining furnace is 30 tons, and the ladle used is
Magnesia carbon brick ladle.
The percent mass proportioning of 0Cr18Ni9Ti components is in national standard：C ≤ 0.08 ； Si ≤ 1.00 ； Mn ≤
2.00 ； Cr 17.00-19.00 ；Ni 8.00-11.00 ； Ti ≥ 5*C ； P ≤ 0.040 ； S ≤ 0.030； N
≤ 0.10；
The present invention arrives the percent mass proportioning control of the component of the steel grade：
C ≤ 0.03 ； Si 0.30-0.75 ； Mn 0.80-1.50 ； Cr 17.00-18.00 ；
Ni 8.00-8.30 ； Ti 5*C-0.25 ； P ≤ 0.040 ； S ≤ 0.005； N ≤ 0.030.
Remaining is Fe and inevitable impurity.
The titanium-containing austenitic stainless steel seamless steel pipe of Examples 1 and 2 with the specific steps of circular pipe blank continuous casting producing method such as
Under：
1）AOD converts steel and goes to addition ton steel 10kg carburants in AOD furnace, and AOD carbon contents at initial stage are 2.6%, are blended into AOD stoves
Liquid steel temperature be 1510 DEG C；
2）AOD oxygen decarburizations：By AOD air ports and top gun toward the mixed gas that oxygen and inert gas are blown into AOD furnace
Decarburization is carried out, according to the reduction of the carbon content in the AOD furnace constantly ratio of adjustment oxygen and susceptible gas, AOD terminal C contents are
0.018%；
3）Reduction and desulfurization：Add reduction by ferrosilicon and add lime and fluorite slag making desulfurization, in AOD furnace after reduction and desulfurization
Inside skim, the silicone content after reduction in molten steel is 0.32%；
4）Deep deoxidation：Ton steel adds 2kg aluminium ingots and carries out deep deoxidation and add a ton steel 30kg pre-melted refining slags progress in AOD
Refine, aluminium content is 0.023% in molten steel after addition aluminium ingot；
5）Tapping and Ti Alloying：Tap after deep deoxidation, 110kg ferrotianiums, ferrotianium are added with steel stream in tapping process
Addition calculates as follows,
Titanium addition=molten steel amount * 5.5* (carbon content+follow-up carbon increasing amount in molten steel)/titanium recovery rate/titanium grade；
Wherein, titanium recovery rate is according to liquid steel temperature, and the factor such as aluminium content, the remaining quantity of slag is set to 60% ~ 80% in steel
Follow-up carbon increasing amount is set to 0.005% ~ 0.010% according to ladle state, the factor such as LF processing times and heating-up time；
6）LF heats up：Molten steel is into energization heating after LF treating stations, and argon flow amount controls 50L/min, temperature liter during heating
To 1560 DEG C；
7）Calcium treatment：With wire feeder 80m silicon-calcium wires are fed to molten steel；
8）Soft blow：After Calcium treatment, ladle bottom carries out Argon by air brick and carries out soft stirring, argon flow amount control
In ton steel 12L/min, processing time 10min, after treatment liquid steel temperature is 1540 DEG C；
9）Round billet continuous casting：After soft blow, ladle is moved to continuous casting station and is poured into a mould, and utilizes 200 round billet continuous casting machines of Φ
Produce continuous casting circular tube blank.Whole in casting process to use non-oxidation molding casting, filling pipe end is inserted into Metal in Tundish, long water
Mouth and collector nozzle of ladle junction are protected with argon gas, and pouring basket liquid level is covered using coverture.
The molten steel ultimate constituent of embodiment 1 is
C 0.026% ； Si 0.56% ； Mn 1.28% ； Cr 17.25% ； Ni 9.06% ； Ti 0.158% ； P
0.038% ； S 0.0032%； N 0.016%.
The molten steel ultimate constituent of embodiment 2 is：
C 0.028% ； Si 0.53% ； Mn 1.18% ； Cr 17.20% ； Ni 9.05% ； Ti 0.165% ； P
0.036% ； S 0.0045%； N 0.018%.
Comparative example 1 and 2
Comparative example 1 selects the preparation method of 06Cr18Ni11Ti and the stainless steel of existing process production titaniferous stainless pipe
Base, a diameter of Φ 200 of circular pipe blank, using the technique of static ingot+forging.
Comparative example 2 selects the preparation method of 0Cr18Ni9Ti and the stainless steel of existing process production titaniferous stainless pipe
Base, a diameter of Φ 200 of circular pipe blank, using the technique of static ingot+forging.
Those skilled in the art can learn the specific steps of the preparation method production of the stainless steel of existing process, therefore not
Ao Shu again.
The 1 molten steel ultimate constituent of comparative example is
C 0.045% ； Si 0.56% ； Mn 1.28% ； Cr 17.25% ； Ni 9.06% ； Ti 0.365% ； P
0.038% ； S 0.0032%；N 0.016%,
The 2 molten steel ultimate constituent of comparative example is
C 0.038% ； Si 0.53% ； Mn 1.18% ； Cr 17.20% ； Ni 9.05% ； Ti 0.328% ； P
0.036% ； S 0.0045%；N 0.018%,
The technical-economic index contrast such as following table of embodiment 1 and 2 and comparative example 1 and 2：
| Numbering | Pouring type | Lumber recovery | Steel-making cost | Forge cost | %C | %Ti |
| Embodiment 1 | Continuous casting | 97.6% | 1200 yuan/ton | Nothing | 0.026% | 0.158% |
| Embodiment 2 | Continuous casting | 97.8% | 1200 yuan/ton | Nothing | 0.028% | 0.165% |
| Comparative example 1 | Molding | 86.2% | 1600 yuan/ton | 2000 yuan/ton | 0.045% | 0.365% |
| Comparative example 2 | Molding | 85.8% | 1600 yuan/ton | 2000 yuan/ton | 0.038% | 0328% |
In conclusion titaniferous stainless-steel seamless pipe circular pipe blank continuous casting producing method provided by the invention, can be direct
Titaniferous stainless pipe base is produced with continuous casting process, improves lumber recovery, and eliminates forging process, product quality is with passing
The product that technique productions of uniting come out is suitable, obtains considerable economic benefit.
Claims (9)
- A kind of 1. seamless steel pipe titanium-containing austenitic stainless steel circular pipe blank continuous casting producing method, it is characterised in that：Its process route For electric furnace crude molten steel → AOD stoves refining → LF ladle refinings → round billet continuous casting, comprise the following steps that：1）AOD is converted and is added 5-20kg/ tons of steel carburants according to electric furnace steel tapping component before steel, it is ensured that AOD carbon contents at initial stage are not less than 2.0%, while ensure that the crude steel coolant-temperature gage for being blended into AOD stoves is more than 1470 DEG C；2）AOD oxygen decarburizations；3）Reduction and desulfurization：Add reduction by ferrosilicon and simultaneously add lime and fluorite slag making desulfurization, after reduction and desulfurization in AOD furnace into Row is skimmed；4）Deep deoxidation；5）Tapping and Ti Alloying：Tap after deep deoxidation, ferrotianium is added with steel stream in tapping process；6）LF heats up；7）Calcium treatment：Silicon-calcium wire is fed to molten steel with wire feeder, pure calcium feed quantity is ton steel 0.2kg-0.8kg；8）Soft blow；9）Round billet continuous casting：After soft blow, ladle is moved to continuous casting station and is poured into a mould, and continuous casting is produced using round mold Circular pipe blank.
- 2. a kind of seamless steel pipe according to claim 1 titanium-containing austenitic stainless steel circular pipe blank continuous casting producing method, its It is characterized in that：The step 2）In, aim carbon is controlled in %C≤0.025%；The step 4）In, ton steel adds 1- in AOD 5kg aluminium ingots carry out deep deoxidation and ton steel adds 20-30 kg pre-melted refining slags and refined.
- 3. a kind of seamless steel pipe according to claim 1 titanium-containing austenitic stainless steel circular pipe blank continuous casting producing method, its It is characterized in that：The step 3）In, skim in AOD furnace thorough, remained slag volume is less than ton steel 20kg.
- 4. a kind of seamless steel pipe according to claim 1 titanium-containing austenitic stainless steel circular pipe blank continuous casting producing method, its It is characterized in that：The step 4）In, aluminium content is controlled between 0.01%-0.03% in molten steel after addition aluminium ingot.
- 5. a kind of seamless steel pipe according to claim 1 titanium-containing austenitic stainless steel circular pipe blank continuous casting producing method, its It is characterized in that：The step 5）In, determined to add Ti content according to carbon content in molten steel, titanium addition is according to the following formula meter Calculate：Titanium addition=molten steel amount * 5.5* (carbon content+follow-up carbon increasing amount in molten steel)/titanium recovery rate/titanium grade；Wherein:For titanium recovery rate according to liquid steel temperature, aluminium content in steel, remaining quantity of slag factor is set to 60%-80%；Follow-up carbon increasing amount is set to 0.005%-0.010% according to ladle state, LF processing times and heating-up time factor.
- 6. a kind of seamless steel pipe according to claim 1 titanium-containing austenitic stainless steel circular pipe blank continuous casting producing method, its It is characterized in that：The step 6）In, for molten steel by electric arc heated, temperature is raised to 1580 DEG C -1600 DEG C.
- 7. a kind of seamless steel pipe according to claim 1 titanium-containing austenitic stainless steel circular pipe blank continuous casting producing method, its It is characterized in that：The step 8）In, after Calcium treatment, ladle bottom carries out Argon by air brick and carries out soft stirring, argon gas Flow control is between ton steel 15L/min-20L/min, processing time 8-15min.
- 8. a kind of seamless steel pipe according to claim 1 titanium-containing austenitic stainless steel circular pipe blank continuous casting producing method, its It is characterized in that：The step 9）In, molten steel overheat control is at 35-45 DEG C in casting process and whole process implements molding casting.
- 9. a kind of seamless steel pipe according to claim 1 titanium-containing austenitic stainless steel circular pipe blank continuous casting producing method, its It is characterized in that：The continuous casting producing method is using magnesia carbon brick as ladle lining.
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| CN107287387B (en) * | 2017-06-26 | 2019-04-26 | 永兴特种不锈钢股份有限公司 | A kind of smelting process and a kind of AOD furnace of the steel containing Ti |
| CN110541115A (en) * | 2019-10-08 | 2019-12-06 | 安徽富凯特材有限公司 | Method for manufacturing austenitic stainless steel 150 short-specification continuous casting round pipe blank |
| CN113528928A (en) * | 2021-07-15 | 2021-10-22 | 山西太钢不锈钢股份有限公司 | Iron-nickel base alloy continuous casting billet for precision strip steel and production method thereof |
| CN113699428B (en) * | 2021-07-19 | 2022-07-01 | 北京科技大学 | Ti alloying process for reducing TP321 stainless steel seamless tube layering defect |
| CN113699429B (en) * | 2021-07-19 | 2022-10-11 | 北京科技大学 | Smelting process for reducing TP321 stainless steel seamless tube layering defects |
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| CN105385946A (en) * | 2015-12-03 | 2016-03-09 | 攀钢集团成都钢钒有限公司 | Production method for seamless steel pipe steel at low temperature of minus 100 DEG C |
| CN105861951A (en) * | 2016-06-07 | 2016-08-17 | 东北特钢集团大连特殊钢有限责任公司 | Manufacturing method of oversized continuous casting slab of nickel stainless steel |
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| CN105385946A (en) * | 2015-12-03 | 2016-03-09 | 攀钢集团成都钢钒有限公司 | Production method for seamless steel pipe steel at low temperature of minus 100 DEG C |
| CN105861951A (en) * | 2016-06-07 | 2016-08-17 | 东北特钢集团大连特殊钢有限责任公司 | Manufacturing method of oversized continuous casting slab of nickel stainless steel |
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