CN105385946B - The production method of 100 DEG C of low temperature seamless steel pipe steel - Google Patents
The production method of 100 DEG C of low temperature seamless steel pipe steel Download PDFInfo
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- CN105385946B CN105385946B CN201510881757.0A CN201510881757A CN105385946B CN 105385946 B CN105385946 B CN 105385946B CN 201510881757 A CN201510881757 A CN 201510881757A CN 105385946 B CN105385946 B CN 105385946B
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
-
- 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
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/52—Manufacture of steel in electric furnaces
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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
- C21C7/06—Deoxidising, e.g. killing
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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
- C21C7/072—Treatment with gases
-
- 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
- C21C7/10—Handling in a vacuum
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- 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
Abstract
The invention discloses a kind of production method of 100 DEG C of low temperature seamless steel pipe steel; first smelted using ultra high electric arc furnace; control molten steel aim carbon≤0.04% and terminal phosphorus≤0.003%; Al balls and CaBaAlSi double deoxidizer deoxidations are added during tapping, then through LF refining, is operated using big quantity of slag air-isolation; handled with Ca lines and change inclusion morphology; then VD applications of vacuum, finally using round billet continuous casting machine protective casting circular pipe blank, are directly used in tube rolling and obtain low temperature seamless steel pipe.100 DEG C of low temperature seamless steel pipe steel purity of steel produced by the invention is high, and gas content is low, and harmful element P, S content is low, and production procedure is short, and cost is low, and the market competitiveness is strong, can wide popularization and application.
Description
Technical field
Embodiments of the present invention are related to field of metallurgy, more specifically, embodiments of the present invention are related to -100 DEG C of one kind
The production method of low temperature seamless steel pipe steel.
Background technology
With China's rapid development of economy, domestic petroleum, chemical industry equal energy source industry need a large amount of cryogenic steel to manufacture
Various liquefied petroleum gas, liquefied ammonia, liquid oxygen, the production of liquid nitrogen and storage device.Planned according to China " 12 ", the coming five years will
Optimize the development of fossil energy, accelerate the exploitation of petroleum resources.This will give production of energy and storage device under low temperature service condition
The wide market of manufacturing offer and opportunity to develop, while can also promote the development of low temperature material.Used because container is special
On the way, the requirement to low temperature Steel Properties is stricter, first has to ensure have the energy of enough anti-brittle crackings at service temperatures
Power, it is desirable to which product not only has high intensity, but also to possess high low-temperature impact toughness, therefore cryotronl is pure to steel
Degree requires very high, and requires higher to the degree of purity of steel with the reduction of temperature.
CN103131963 patents of invention propose low temperature seamless steel pipe material and preparation method thereof, and steel smelt production work
Skill is：Molten iron pretreatment → converter smelting → LF refining → VD degassings → round billet continuous casting, this method is to use the long flow work of converter
Skill line is produced, and has carried out deep desulfurization pretreatment to molten iron, it is ensured that purity of steel, the production cycle is long, and cost is high, and competitiveness is poor；
And the harmful element P content of this method production is high, all more than 0.013%, is unfavorable for the low-temperature impact toughness of product；VD is true
Globular inclusion particle in silicon-calcium wire, steel is fed after sky tiny and many, it is not easy to floating removal, have a strong impact on the low-temperature impact of product
Performance.
The content of the invention
Instant invention overcomes the deficiencies in the prior art there is provided a kind of production method of -100 DEG C of low temperature seamless steel pipe steel, with
It is expected that existing -100 DEG C of low-temperature steels production cycle length, cost height can be solved, competitiveness is poor, and harmful element is high, inclusion particle
It is many, the problem of low-temperature impact toughness is low.
To solve above-mentioned technical problem, one embodiment of the present invention uses following technical scheme：
A kind of production method of -100 DEG C of low temperature seamless steel pipe steel, comprises the following steps：
(1) electric arc furnace smelting
Using steel scrap and the pig iron as raw material, just steel-making water, the first steel-making water of control are smelted using high impedance ultra high electric arc furnace
Aim carbon≤0.04% and phosphorus≤0.003%；Ni plates are added before tapping and with ladle toast reduces the hydrogen content of molten steel；Go out
Steel, is separately added into Al balls to first steel-making water during being somebody's turn to do and CaBaAlSi double deoxidizers carries out deoxidation；
(2) LF refining
When molten steel obtained by step (1) is transferred into LF refining furnace, the directly lime using 80~90% and 10~20% conjunction
Slagging mixes making foamed slag, is operated using big quantity of slag air-isolation, and the quantity of slag accounts for the 1.2~1.8% of Metal Weight, makes the LF essences
Carbon increasing amount ＜ 0.03% of the ladle and electrode of furnace to molten steel；After refining terminates, according to the addition of 0.10~0.18kg/t steel
Amount wire feeder feeds pure Ca lines to molten steel, the field trash in molten steel is changed into spherical, then using ladle bottom blowing argon gas to steel
Water is quiet to blow more than 15min, and Argon intensity makes molten steel not exposed；
(3) VD applications of vacuum
Molten steel obtained by step (2) is transferred to VD vacuum stove evacuations, 15min is remained above in vacuum ＜ 67Pa, until
Stop vacuumizing when clinker no longer foams in molten steel, open the vacuum cover of VD vacuum drying ovens, it is quiet to molten steel using ladle bottom blowing argon gas
Blow more than 18min；
(4) round billet continuous casting
By molten steel obtained by step (3) using round billet continuous casting machine casting, obtain round billet, be directly used in tube rolling, obtain low temperature without
Stitch steel pipe.
The production method of above-mentioned -100 DEG C of low temperature seamless steel pipe steel, the raw material include 55~65% steel scrap and 35~
45% pig iron.
The production method of above-mentioned -100 DEG C of low temperature seamless steel pipe steel, it is described make molten steel hydrogen content reduce specific method be：
Ni plates are added in the ladle of the electric arc furnaces by 2h according to the addition of 25~28kg/t steel before arc furnace tapping, are entered with ladle
Row baking, 800 DEG C of baking temperature ＞.
The production method of above-mentioned -100 DEG C of low temperature seamless steel pipe steel, step (1) tapping uses eccentric bottom tapping, electricity
The tapping temperature of arc stove is 1630~1650 DEG C, the addition of the Al balls and CaBaAlSi double deoxidizers is respectively 3.3~
3.8kg/t steel, 2.0~2.5kg/t steel.
The production method of above-mentioned -100 DEG C of low temperature seamless steel pipe steel, the high impedance ultra high electric arc furnace is 70 tons of high resistants
Anti- ultra high power.
The production method of above-mentioned -100 DEG C of low temperature seamless steel pipe steel, the specification of the round billet is Φ 200mm~Φ 430mm,
The gas content of the round billet is：H 0.00004~0.00007%, O 0.0012~0.0018%, N 0.0030~
0.0050%, harmful element P 0.005~0.008%, S 0.001~0.004%.
The production method of above-mentioned -100 DEG C of low temperature seamless steel pipe steel, the chemical composition of the low temperature seamless steel pipe contains by weight
Amount is calculated as：C0.06~0.10%, Si0.21~0.33%, Mn0.48~0.58%, P≤0.008%, S≤0.004%, Ni
3.4~3.7%, Al 0.03~0.06%, surplus are iron and inevitable impurity.
Technical scheme is further detailed below.
Present invention high impedance ultra high electric arc furnace smelts just steel-making water, utilizes ultra high electric arc furnace high alkalinity, low
Temperature, high oxidation iron and furnace wall coherent oxygen lance oxygen decarburization such as are stirred vigorously at the characteristic, effectively remove harmful element phosphorus in molten steel,
Hydrogen, nitrogen and non-metallic inclusion.
Al balls are added in arc furnace tapping process and composite fluxing medium is common to molten steel progress deoxidation, allow first steel-making water to be formed
Al2O3Field trash has sufficient floating interval of floating dock, while ensureing that the Al of tube blank steel contains after LF refining, VD applications of vacuum, continuous casting
Amount reaches 0.030~0.060%, while avoiding the addition Al during LF refining from aoxidizing the Al to be formed2O3Field trash is not abundant
Floating interval of floating dock, increase Ca processing after globular inclusion content.
Made steel at the beginning of electric arc furnaces and add Ni plates into ladle before water tapping, the hydrogen content in Ni plates can be removed, molten steel is reduced
Hydrogen content.Step (1) requires that the carbon content and phosphorus content of water terminal are just made steel in control, if carbon content is higher than 0.04%, it is impossible to protect
The requirement that the low-temperature steel carbon content finally given reaches 0.06~0.10% is demonstrate,proved, but in order to avoid Molten Steel over-oxidation, it is necessary to control
Electric arc furnaces furnace wall coherent oxygen lance oxygen blast intensity, to control carbon content of molten steel to be less than 0.04%.If phosphorus is more than 0.003%,
The rephosphorization for the phosphorus bearing slag taken out of during LF refining by arc furnace tapping molten steel and the addition increased phosphorus of ferroalloy, can make the phosphorus of product
Content increases harmful element content more than 0.008%, influences the low-temperature flexibility of steel.1630~1650 DEG C of arc furnace tapping temperature,
Using eccentric bottom tapping (EBT), prevent electric arc furnaces oxidizing slag from entering LF refining furnace.
The present invention is not added with Al deoxidations when molten steel is to LF refining furnace station, and LF refining furnace can be prevented using the operation of the big quantity of slag
The graphitic carbon that anodizing comes off during heating enters carbon content in molten steel increase steel, prevents carbon containing 17~20% magnesia carbon brick ladle
The carbon of slag line enters in molten steel, and control LF refining process ladle and electrode molten steel recarburization amount are less than 0.03%, it is ensured that products C content
The requirement of satisfaction 0.06~0.10%；Using big quantity of slag air-isolation, molten steel air-breathing and secondary oxidation are prevented.Realize LF refining
Desulfurization rapidly, deoxidation, degassing, go to be mingled with, adjust alloying component.
After LF refining terminates, feed pure Ca lines with wire feeder and denaturation treatment is carried out to the field trash in molten steel, make in molten steel
Inclusion modification to be spherical.More than ladle bottom blowing argon gas 15min, when allowing the globular inclusion in molten steel to have sufficient floating
Between, improve purity of steel, influence of the reduction globular inclusion to low-temperature impact toughness.If the pure Ca lines of feeding are less than
0.10Kg/t steel, then can not be such that field trash is denatured completely, and the pure Ca lines amount of feeding is more than 0.18Kg/t steel, and one is increase cost,
Two be feed pure Ca lines amount it is big when molten steel boiling it is violent, steel liquid fluctuating causes greatly molten steel air-breathing, produces secondary oxidation.
The purpose of ladle bottom blowing argon gas is to allow field trash after application of vacuum further to float in VD vacuum processing steps, is improved
Purity of steel.
Cast during round billet continuous casting using whole process protection, solve the problems, such as molten steel air-breathing and secondary oxidation of steel.Using Large Copacity
Tundish (for example, capacity is 20 tons) allows field trash fully to float.
The present invention, which solves low-temperature steel Gr.3 productions, to be needed to carry out molten iron deep desulfurization pretreatment, and production procedure is long, cost
Height, competitiveness is poor, influences the harmful element phosphorus content of low-temperature impact toughness high, and there is provided a kind of -100 DEG C for the problem more than field trash
The production method of low temperature seamless steel pipe Gr.3 tube blank steels, using ultra high electric arc furnace, eccentric bottom tapping, LF external refinings,
VD applications of vacuum, the low temperature seamless steel tube blank steel purity of steel height of full guard round billet continuous casting production, gas content are low, are harmful to
Element P, S content is low, and production procedure is simple, and flow is short, and cost is low, can be produced in batches, so as to widely be promoted
Using.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to embodiments, to the present invention
It is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not used to
Limit the present invention.
The technological process of production of the present invention is as follows：
High impedance ultra high electric arc furnace smelting → LF refining → VD applications of vacuum → round billet continuous casting → tube rolling.Specific steps
It is：
(1) electric arc furnaces makees raw material using steel scrap and the pig iron, wherein, steel scrap accounts for 55~65wt%, and the pig iron accounts for 35~45wt%,
With 70 tons of high impedance ultra high electric arc furnace smelting molten steels.Electric arc furnaces molten steel aim carbon≤0.04% and phosphorus≤0.003% are controlled,
Al 3.3~3.8kg/t of ball steel, CaBaAlSi 2.0~2.5kg/t of double deoxidizer steel is added during arc furnace tapping to carry out
The Ni plates of 25~28kg/t steel are added before pre-deoxidation, arc furnace tapping into ladle, are toasted with ladle, baking temperature is more than
800 DEG C, remove the hydrogen content in Ni plates.1630~1650 DEG C of arc furnace tapping temperature, using eccentric bottom tapping (EBT).
(2) when molten steel is to LF refining furnace station, Al deoxidations are not added with, using 80~90% lime and 10~20% synthetic slags
Making foamed slag is mixed, is operated using the big quantity of slag, the quantity of slag accounts for the 1.2~1.8% of Metal Weight, desulfurization rapidly, deoxidation, degassing, is gone
It is mingled with, the alloying component that adjustment steel grade needs.After LF refining terminates, the pure Ca lines of 0.10~0.20kg/t steel are fed with wire feeder
Denaturation treatment is carried out to field trash, it is spherical to make the inclusion modification in molten steel.After Ca processing, using ladle bottom blowing argon gas to steel
Water progress is quiet to blow, and quiet to blow more than time 15min, Argon intensity makes molten steel not exposed.The temperature of tapping is 1640~1660 DEG C.
(3) LF refining molten steel is sent to VD stations and carries out vacuumize process, under conditions of vacuum is less than 67Pa, kept
Time is more than 15min, until stopping vacuumizing when clinker no longer foams, opens vacuum cover, molten steel is entered using steel ladle bottom argon blowing
Row is quiet to be blown, quiet to blow the time more than 18min.
(4) Φ 200mm~Φ 430mm specifications are cast into using round billet continuous casting machine, in casting process, using whole process protection
Casting, solves the problems, such as molten steel air-breathing and secondary oxidation of steel.Large Copacity tundish (for example, capacity is 20 ton) is used to allow field trash
Fully float.The continuous cast round billets being cast into, are directly used in tube rolling.The chemical composition of gained seamless steel pipe content by weight is calculated as：
C0.06~0.10%, Si 0.21~0.33%, Mn0.48~0.58%, P≤0.008%, S≤0.004%, Ni3.4~
3.7%th, Al0.03~0.06%, surplus are iron and inevitable impurity.
Embodiment 1~3 uses the above method, and the data implementation production seamless steel tube blank in table 1.Each reality
Apply tube blank steel harmful element and gas examination obtained by example and the results are shown in Table 2, non-metallic inclusion is shown in Table 3.
The embodiment 1 of table 1 to embodiment 3 peration data
| Embodiment 1 | Embodiment 2 | Embodiment 3 | |
| Steel scrap, pig iron weight ratio | 60%th, 40% | 55%th, 45% | 65%th, 35% |
| Al ball consumptions | 3.3kg/t steel | 3.5kg/t steel | 3.8kg/t steel |
| CaBaAlSi consumptions | 2.5kg/t steel | 2.3kg/t steel | 2.0kg/t steel |
| Ni plate consumptions | 26kg/t steel | 28kg/t steel | 25kg/t steel |
| Lime/synthetic slag | 80%th, 20% | 85%th, 15% | 90%th, 10% |
| The LF quantity of slag | 1.8% | 1.5% | 1.2% |
| Pure Ca lines amount | 0.18kg/t steel | 0.15kg/t steel | 0.10kg/t steel |
| Round billet diameter | 200mm | 280mm | 430mm |
The tube blank steel harmful element of table 2 and gas examination result
| Embodiment | P% | S% | H% | O% | N% |
| 1 | 0.005 | 0.004 | 0.00004 | 0.0014 | 0.0030 |
| 2 | 0.006 | 0.001 | 0.00005 | 0.0012 | 0.0041 |
| 3 | 0.008 | 0.002 | 0.00007 | 0.0018 | 0.0050 |
The tube blank steel examination of nonmetallic inclusion result of table 3
In terms of table 2, the gas of table 3 and field trash assay, using -100 DEG C of low temperature seamless steel pipe pipe produced by the invention
Base steel Gr.3 hydrogen contents are not more than 0.00007%, oxygen content and are not more than 0.0018%, and nitrogen content is not more than 0.0050%, are harmful to
Element P content is not more than 0.008%, S contents and is not more than 0.004%, field trash A classes be not more than 0.5 grade, B classes be not more than 0.5
Level, C classes be not more than 0.5 grade, D classes be not more than 1.0 grades, fully meet the smelting of -100 DEG C of low temperature seamless steel tube blank steel high cleanlinesses
Golden quality requirement.
Although reference be made herein to invention has been described for explanatory embodiment of the invention, however, it is to be understood that ability
Field technique personnel can be designed that a lot of other modification and embodiment, and these modifications and embodiment will fall public in the application
Within the spirit and spirit opened.More specifically, can be to the group of theme composite configuration in the range of disclosure
A variety of variations and modifications are carried out into part and/or layout.In addition to the variations and modifications carried out to building block and/or layout,
To those skilled in the art, other purposes also will be apparent.
Claims (7)
1. a kind of production method of -100 DEG C of low temperature seamless steel pipe steel, it is characterised in that comprise the following steps：
(1) electric arc furnace smelting
Using steel scrap and the pig iron as raw material, just steel-making water, the first steel-making water terminal of control are smelted using high impedance ultra high electric arc furnace
Carbon≤0.04% and phosphorus≤0.003%；Ni plates are added before tapping and with ladle toast reduces the hydrogen content of molten steel；Tapping,
Al balls are separately added into first steel-making water and CaBaAlSi double deoxidizers carry out deoxidation during being somebody's turn to do；
(2) LF refining
When molten steel obtained by step (1) is transferred into LF refining furnace, directly using 80~90% lime and 10~20% synthetic slag
Making foamed slag is mixed, is operated using big quantity of slag air-isolation, the quantity of slag accounts for the 1.2~1.8% of Metal Weight, makes the LF refining furnace
Carbon increasing amount ＜ 0.03% to molten steel of ladle and electrode；After refining terminates, used according to the addition of 0.10~0.18kg/t steel
Wire feeder feeds pure Ca lines to molten steel, and the field trash in molten steel is changed into spherical, then quiet to molten steel using ladle bottom blowing argon gas
More than 15min is blown, Argon intensity makes molten steel not exposed, tapped；
(3) VD applications of vacuum
Molten steel obtained by step (2) is transferred to VD vacuum stove evacuations, 15min is remained above in vacuum ＜ 67Pa, until molten steel
Stop vacuumizing when middle clinker no longer foams, open the vacuum cover of VD vacuum drying ovens, blow big using ladle bottom blowing argon gas is quiet to molten steel
In 18min；
(4) round billet continuous casting
Molten steel obtained by step (3) is cast using round billet continuous casting machine, round billet is obtained, is directly used in tube rolling, obtain the seamless steel of low temperature
Pipe；The chemical composition content by weight of the low temperature seamless steel pipe is calculated as：C0.06~0.10%, Si 0.21~0.33%,
Mn0.48~0.58%, P≤0.008%, S≤0.004%, Ni3.4~3.7%, Al0.03~0.06%, surplus are for iron and not
Evitable impurity.
2. the production method of -100 DEG C of low temperature seamless steel pipe steel according to claim 1, it is characterised in that the raw material bag
Include 55~65% steel scrap and 35~45% pig iron.
3. the production method of -100 DEG C of low temperature seamless steel pipe steel according to claim 1, it is characterised in that described to make molten steel
Hydrogen content reduction specific method be：Ni plates are added to the electric arc furnaces by 2h according to the addition of 25~28kg/t steel before tapping
Ladle in, toasted with ladle, 800 DEG C of baking temperature ＞.
4. the production method of -100 DEG C of low temperature seamless steel pipe steel according to claim 1, it is characterised in that step (1) is described
Tapping uses eccentric bottom tapping, and the tapping temperature of electric arc furnaces is 1630~1650 DEG C, and the Al balls and CaBaAlSi are compound de-
The addition of oxygen agent is respectively 3.3~3.8kg/t steel, 2.0~2.5kg/t steel.
5. the production method of -100 DEG C of low temperature seamless steel pipe steel according to claim 1, it is characterised in that the high impedance
Ultra high electric arc furnace is 70 tons of high impedance ultra high powers.
6. the production method of -100 DEG C of low temperature seamless steel pipe steel according to claim 1, it is characterised in that step (2) is described
The temperature of tapping is 1640~1660 DEG C.
7. the production method of -100 DEG C of low temperature seamless steel pipe steel according to claim 1, it is characterised in that the round billet
Specification is Φ 200mm~Φ 430mm, and the gas content of round billet is：H 0.00004~0.00007%, O 0.0012~
0.0018%, N 0.0030~0.0050%, harmful element P 0.005~0.008%, S 0.001~0.004%.
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| CN106191375B (en) * | 2016-08-23 | 2018-04-24 | 浙江青山钢铁有限公司 | Seamless steel pipe titanium-containing austenitic stainless steel circular pipe blank continuous casting producing method |
| CN107058675A (en) * | 2017-03-29 | 2017-08-18 | 辽宁工业大学 | A kind of Industrial Process Control Methods of multivariable |
| CN109504815B (en) * | 2018-11-16 | 2021-07-09 | 山东寿光巨能特钢有限公司 | Method for controlling center porosity of low-alloy high-strength steel large round billet for large annular forging |
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| CN1807955A (en) * | 2006-01-20 | 2006-07-26 | 天津商学院 | High alloy steel seamless steel pipe and production method thereof |
| CN101643882A (en) * | 2009-08-20 | 2010-02-10 | 朝阳西姆莱斯石油铸钢管件有限公司 | Clean steel smelting method of anti-S steel oil well pipe |
| CN103131963A (en) * | 2013-03-22 | 2013-06-05 | 内蒙古包钢钢联股份有限公司 | Low-temperature seamless steel pipe material and preparation method thereof |
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