CN107099747B - A kind of production technology for controlling acid-resistant pipeline steel Large Inclusions - Google Patents

A kind of production technology for controlling acid-resistant pipeline steel Large Inclusions Download PDF

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CN107099747B
CN107099747B CN201710291477.3A CN201710291477A CN107099747B CN 107099747 B CN107099747 B CN 107099747B CN 201710291477 A CN201710291477 A CN 201710291477A CN 107099747 B CN107099747 B CN 107099747B
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steel
desulfurization
production technology
molten steel
resistant pipeline
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CN107099747A (en
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翟冬雨
徐建飞
姜金星
黄福强
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Nanjing Iron and Steel Co Ltd
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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
    • 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
    • C21C7/0006—Adding metallic additives
    • 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
    • C21C7/0037—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 by injecting powdered material
    • 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
    • C21C7/0056—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires
    • 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
    • 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
    • C21C7/064—Dephosphorising; Desulfurising
    • 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
    • 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
    • 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
    • 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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
    • 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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
    • 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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
    • 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

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Treatment Of Steel In Its Molten State (AREA)

Abstract

The invention discloses a kind of production technologies for controlling acid-resistant pipeline steel Large Inclusions, and by carrying out network analysis to BOF → RH → LF production technology pipe line steel Control and Inclusion Removals mechanism, rational to carry out composition design, pipeline steel constitution is by weight percentage：C：0.02~0.04%, Si：0.10~0.30%, Mn：1.00~1.30%, P≤0.013%, S≤0.0010%, Nb：0.030~0.070%, Ti：0.006~0.020%, Ni：0.10~0.30%, Cr：0.10~0.30%, Cu：0.10~0.30%, Al：0.015~0.050%, surplus Fe；Sulfur content is less than 10ppm in molten steel before guarantee Calcium treatment, and the quantitative Calcium treatment after LF achievees the purpose that improve Molten Steel Cleanliness, so as to promote steel internal soundness, improves economic benefit.

Description

A kind of production technology for controlling acid-resistant pipeline steel Large Inclusions
Technical field
The invention belongs to field of metallurgy, are related to a kind of production technology for controlling acid-resistant pipeline steel Large Inclusions.
Background technology
With being continuously increased for world economy energy demand, increasing, pipe is relied on to the pipeline of oil, natural gas The Service Environment of line conveyance conduit requires increasingly harshness, base material is needed to have the acid petroleum gas of conveying antiacid anti-corrosion Performance in order to meet Antacid effectiveness, is needed in composition design using extremely low carbon, extremely low sulphur, desulfurization is resulted in steel and generated largely Aluminium system field trash, so as to cause detecting a flaw, being mingled with disqualified upon inspection, while seriously affect the performance of steel plate.
Antiacid corroded pipeline steel is mainly used to the pipeline of manufacture conveying sour natural gas, is that petroleum gas is produced in steel One kind of difficulty maximum.The steel grade has composition design, smelting technique, rolling technique and metallurgical equipment very stringent It is required that.Antiacid corroded pipeline steel on Design of Chemical Composition should with extremely low carbon, based on extremely low phosphorus, super-low sulfur and microalloying, Control stress point is to reduce harmful element sulphur, phosphorus and gas content in steel, reduce nonmetallic inclusionsin steel content in production, special It is not that the A class very harmful to the Properties of HIC resistance of steel, B classes are mingled with, and denaturation treatment is carried out to field trash.In production process by It is huge in desulfurization pressure, a large amount of Al must be generated2O3Field trash, it is the premise for manufacturing quality product that control, which reduces Large Inclusions,.
Invention content
The technical problems to be solved by the invention are, for above shortcoming of the existing technology, to propose that a kind of control is anti- The production technology of sour pipe line steel Large Inclusions so as to control B type impurities quantity in steel plate, and obtains degree of purity higher Molten steel, promote the internal soundness of molten steel.
The present invention solve more than technical problem technical solution be：
A kind of production technology for controlling acid-resistant pipeline steel Large Inclusions, includes the following steps：
(i) composition controls, and pipeline steel constitution is by weight percentage：C：0.02~0.04%, Si：0.10~0.30%, Mn： 1.00~1.30%, P≤0.013%, S≤0.0010%, Nb：0.030~0.070%, Ti：0.006~0.020%, Ni：0.10~ 0.30%, Cr：0.10~0.30%, Ca：0.0040%, Cu：0.10~0.30%, Al：0.015~0.050%, surplus is Fe and miscellaneous Matter；
(ii) desulfurization station carries out compound desulfurization using lime and magnesium powder, carries out taking off Slag treatment deeply after desulfurization, desulfurization station takes off Sulphur standard≤0.005%, converter use steel scrap, it is ensured that and converter tapping sulphur reaches≤0.010%, and converter tapping, which uses, stays oxygen to operate, It is ready for RH vacuum decarburizations；
(iii) RH application of vacuum, vacuum degree are less than 3mbar, and the pure vacuum time is more than or equal to 15 minutes, pass through vacuum processing reality Existing reaction between carbon and oxygen, molten steel realizes the state of hypoxemia, low-carbon, high-cleanness, high after vacuum processing, after vacuum processing molten steel send to LF into Row desulfurized alloyization operates；
(iv) LF carries out desulfurization operations, desulfurization to 5~8ppm, it is ensured that molten steel sulphur during Calcium treatment using the main aluminium deoxidier of lime No more than 10ppm, the generation of manganese sulfide inclusion is on the one hand prevented, on the other hand provides condition for generation CaS, CaO, through too deep de- Sulphur, the content of oxygen are extremely low in the molten steel of sulphur, but there are a large amount of Al in molten steel2O3Field trash, it is seamless into 220 meters by being simmered in molten steel Pure calcium core-spun yarn, it is ensured that the Al in the complete removal of inclusions of Calcium treatment2O3, oxygen, reaction of Salmon-Saxl in extra calcium content and molten steel, CaS, CaO are produced, finally acquisition CaO-CaS systems field trash, quiet after Calcium treatment to stir 15~20 minutes, the solid CaO- in molten steel The field trash aggregation of CaS systems is floated, and obtains clean acid-resistant pipeline steel water；
(v) continuous casting is poured into a mould using full guard.
The technical solution that further limits of the present invention is：
The production technology of aforementioned control acid-resistant pipeline steel Large Inclusions, wherein pipeline steel constitution are by weight percentage For：C：0.040%, Si 0.30%, Mn：1.30%, P：0.013%, S：0.0010%, Nb：0.070%, Ti：0.020%, Ca： 0.0040%, Al：0.050%, Cu：0.30%, Ni：0.30%, Cr：0.30%, surplus Fe.
The production technology of aforementioned control acid-resistant pipeline steel Large Inclusions, wherein pipeline steel constitution are by weight percentage For：C：0.020%, Si 0.10%, Mn：1.0%, P：0.01%, S：0.0010%, Nb：0.030%, Ti：0.006%, Ca： 0.0040%, Al：0.015%, Cu：0.10%, Ni：0.10%、Cr：0.10%, surplus Fe.
The production technology of aforementioned control acid-resistant pipeline steel Large Inclusions, it is quiet wherein after Calcium treatment to stir 20 minutes.
The production technology of aforementioned control acid-resistant pipeline steel Large Inclusions, it is quiet wherein after Calcium treatment to stir 18 minutes.
This is bright with having carried out rational design to pipeline steel constitution according to Control and Inclusion Removal formation mechenism, employs a kind of hypoxemia The composition design of low-sulfur；Because calcium-aluminate deformability is good, a string-like B type impurities can be deformed into the operation of rolling, so as to It is degrading steel plate mechanics and Properties of HIC resistance；The present invention is through scientific experiment the study found that when desulfurization to 5~8ppm is carried out at strong calcium Reason, can avoid calcium-aluminate formation zone, i.e., feeding more calcium into molten steel（It is seamless pure into 220 meters by being simmered in molten steel Calcium core-spun yarn）, field trash can be changed into high-melting-point and on-deformable CaO-CaS, control B type impurity quantity in steel plate.Cause This, after LF deoxidation alloyings, obtains the ultra-low sulphur steel liquid of below 10ppm, can by feeding more calcium into molten steel Obtain CaO-CaS systems field trash.
The beneficial effects of the invention are as follows：The present invention is realized using BOF+RH+LF process routes, LF less than 10ppm super-low sulfurs It smelts, Al in field trash is thoroughly restored by quantitative Calcium treatment at this time2O3, obtain CaO-CaS systems field trash, high-melting-point and not Yielding CaO-CaS field trashes are more easy to aggregation during quiet stir and float, and so as to obtain the higher molten steel of degree of purity, are promoted The internal soundness of molten steel.The present invention is achieved the purpose that improve Molten Steel Cleanliness using a kind of mode of production of innovation, be set from composition The molten steel that sulphur is less than 10ppm is obtained after deoxidation alloying is ensured on meter, the molten steel after LF desulfurization carries out strong Calcium treatment, obtains CaO- CaS systems solid inclusions stir floating by quiet, obtain more clean acid-resistant pipeline steel water.
Specific embodiment
Embodiment 1
The present embodiment is a kind of production technology for controlling acid-resistant pipeline steel Large Inclusions, is included the following steps：
(i) the weight percent composition of pipe line steel is：C：0.040%, Si 0.30%, Mn：1.30%, P：0.013%, S： 0.0010%, Nb：0.070%, Ti：0.020%, Ca：0.0040%, Al：0.050%, Cu：0.30%, Ni：0.30%, Cr：0.30%, Surplus is Fe；
(ii) desulfurization station carries out compound desulfurization using lime and magnesium powder, skims after desulfurization clean, sulphur is less than after ensureing Converter 100ppm；
(iii) after molten steel reaches RH, vacuum degree≤3mbar carries out carbonization treatment, and carbon carries out Alloying Treatment after being less than 0.01%, Vacuum holding is carried out after alloying, is operated in vacuum process without alloying；
(iv) LF carries out desulfurization operations, desulfurization to 5~8ppm, it is ensured that molten steel sulphur during Calcium treatment using lime, aluminium deoxidier No more than 10ppm；
(v) LF desulfurized alloyizations treated molten steel carries out Calcium treatment, feeds 220 meters of seamless pure calcium core-spun yarns, after Calcium treatment Molten steel is quiet to stir 15~20min, and field trash is promoted fully to float and remove；
(vi) casting process is poured into a mould using whole process protection.
The present embodiment smelting process is specific as follows：
BOF tapping sulphur Carbon content after RH vacuum LF sulfur contents Calcium treatment amount It is quiet to stir the time
Embodiment 1 0.008% 0.007% 0.0006% 220 meters 20min
Steel plate detection case
Sulphide inculsion Alumina inclusion Silicate Inclusions Spherical oxide DS field trashes
Embodiment 1 0 0 0 0 0.5
The pipeline steel smelting of the present embodiment is mingled in molten steel by the extremely low sulphur environment high Calcium treatment after LF deoxidation alloyings Object overall quantity significantly reduces, and Molten Steel Cleanliness improves.
Embodiment 2
The present embodiment is a kind of production technology for controlling acid-resistant pipeline steel Large Inclusions, is included the following steps：
(i) the weight percent composition of pipe line steel is：C：0.020%, Si 0.10%, Mn：1.0%, P：0.01%, S： 0.0010%, Nb：0.030%, Ti：0.006%, Ca：0.0040%, Al：0.015%, Cu：0.10%, Ni：0.10%、Cr：0.10%, Surplus is Fe；
(ii) desulfurization station carries out compound desulfurization using lime and magnesium powder, skims after desulfurization clean, sulphur is less than after ensureing Converter 100ppm；
(iii) after molten steel reaches RH, vacuum degree≤3mbar carries out carbonization treatment, and carbon carries out Alloying Treatment after being less than 0.01%, Vacuum holding is carried out after alloying, is operated in vacuum process without alloying；
(iv) LF carries out desulfurization operations, desulfurization to 5~8ppm, it is ensured that molten steel sulphur during Calcium treatment using lime, aluminium deoxidier No more than 10ppm；
(v) LF desulfurized alloyizations treated molten steel carries out Calcium treatment, feeds 220 meters of seamless pure calcium core-spun yarns, after Calcium treatment Molten steel is quiet to stir 15~20min, and field trash is promoted fully to float and remove；
(vi) casting process is poured into a mould using whole process protection.
The present embodiment smelting process is specific as follows：
BOF tapping sulphur Carbon content after RH vacuum LF sulfur contents Calcium treatment amount It is quiet to stir the time
Embodiment 2 0.009% 0.006% 0.0005% 220 meters 18min
Steel plate detection case
Sulphide inculsion Alumina inclusion Silicate Inclusions Spherical oxide DS field trashes
Embodiment 2 0 0 0 0 0.5
The pipeline steel smelting of the present embodiment is mingled in molten steel by the extremely low sulphur environment high Calcium treatment after LF deoxidation alloyings Object overall quantity significantly reduces, and Molten Steel Cleanliness improves.
In addition to the implementation, the present invention can also have other embodiment.It is all to use equivalent substitution or equivalent transformation shape Into technical solution, all fall within the present invention claims protection domain.

Claims (5)

1. a kind of production technology for controlling acid-resistant pipeline steel Large Inclusions, it is characterised in that：Include the following steps：
(i) composition controls, and pipeline steel constitution is by weight percentage：C：0.02~0.04%, Si：0.10~0.30%, Mn：1.00 ~1.30%, P≤0.013%, S≤0.0010%, Nb：0.030~0.070%, Ti：0.006~0.020%, Ni：0.10~ 0.30%, Cr：0.10~0.30%, Ca：0.0040%, Cu：0.10~0.30%, Al：0.015~0.050%, surplus is Fe and miscellaneous Matter；
(ii) desulfurization station carries out compound desulfurization using lime and magnesium powder, carries out taking off Slag treatment, desulfurization station desulfurization mark deeply after desulfurization Accurate≤0.005%, converter uses steel scrap, it is ensured that converter tapping sulphur reaches≤0.010%, and converter tapping is RH using oxygen is stayed to operate Vacuum decarburization is ready；
(iii) RH application of vacuum, vacuum degree are less than 3mbar, and the pure vacuum time is more than or equal to 15 minutes, and carbon is realized by vacuum processing Oxygen reacts, and molten steel send to LF and carries out desulfurized alloy operation after vacuum processing；
(iv) LF carries out desulfurization operations, desulfurization to 5~8ppm, it is ensured that molten steel sulphur is little during Calcium treatment using the main aluminium deoxidier of lime In 10ppm；By feeding 220 meters of seamless pure calcium core-spun yarns in molten steel, it is ensured that the Al in the complete removal of inclusions of Calcium treatment2O3, it is more Oxygen, reaction of Salmon-Saxl in remaining calcium content and molten steel produce CaS, CaO, finally acquisition CaO-CaS systems field trash, quiet after Calcium treatment It stirs 15~20 minutes, the solid CaO-CaS systems field trash aggregation in molten steel is floated, and obtains clean acid-resistant pipeline steel water；
(v) continuous casting is poured into a mould using full guard.
2. the production technology of control acid-resistant pipeline steel Large Inclusions as described in claim 1, it is characterised in that：Pipe line steel into Part it is by weight percentage：C：0.040%, Si 0.30%, Mn：1.30%, P：0.013%, S：0.0010%, Nb：0.070%, Ti： 0.020%, Ca：0.0040%, Al：0.050%, Cu：0.30%, Ni：0.30%, Cr：0.30%, surplus Fe.
3. the production technology of control acid-resistant pipeline steel Large Inclusions as described in claim 1, it is characterised in that：Pipe line steel into Part it is by weight percentage：C：0.020%, Si 0.10%, Mn：1.0%, P：0.01%, S：0.0010%, Nb：0.030%, Ti： 0.006%, Ca：0.0040%, Al：0.015%, Cu：0.10%, Ni：0.10%、Cr：0.10%, surplus Fe.
4. the production technology of control acid-resistant pipeline steel Large Inclusions as described in claim 1, it is characterised in that：After Calcium treatment It is quiet to stir 20 minutes.
5. the production technology of control acid-resistant pipeline steel Large Inclusions as described in claim 1, it is characterised in that：After Calcium treatment It is quiet to stir 18 minutes.
CN201710291477.3A 2017-04-27 2017-04-27 A kind of production technology for controlling acid-resistant pipeline steel Large Inclusions Active CN107099747B (en)

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CN108998746B (en) * 2017-12-25 2020-01-07 武汉科技大学 X70 grade pipeline steel with high HIC resistance and preparation method thereof
CN109881095B (en) * 2019-03-14 2020-12-18 南京钢铁股份有限公司 grade-B acid-resistant pipeline steel plate and smelting process
CN110643884A (en) * 2019-10-10 2020-01-03 南京钢铁股份有限公司 Production method of one-steel multi-stage pipeline steel blank
CN116536588A (en) * 2023-05-31 2023-08-04 南京钢铁股份有限公司 Steel for deep sea acid-resistant pipeline and production method thereof

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CN102676725A (en) * 2012-05-29 2012-09-19 南京钢铁股份有限公司 Method for controlling nonmetal inclusions in X70 stage acidoresistant pipeline steel
CN102864378A (en) * 2012-10-15 2013-01-09 南京钢铁股份有限公司 Process for smelting low-cost X70 pipeline steel moderate-thickness plate blanks
CN104988270A (en) * 2015-07-08 2015-10-21 南京钢铁股份有限公司 Method for smelting pipeline steel with low cost

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