CN108396106A - A method of reducing pipe line steel C type impurities - Google Patents
A method of reducing pipe line steel C type impurities Download PDFInfo
- Publication number
- CN108396106A CN108396106A CN201710064823.4A CN201710064823A CN108396106A CN 108396106 A CN108396106 A CN 108396106A CN 201710064823 A CN201710064823 A CN 201710064823A CN 108396106 A CN108396106 A CN 108396106A
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- Prior art keywords
- slag
- steel
- added
- argon
- alloying
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Classifications
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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
- C21C7/064—Dephosphorising; Desulfurising
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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
- C21C7/0006—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
- C21C7/04—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
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/076—Use of slags or fluxes as treating agents
-
- 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)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The present invention provides a kind of method reducing pipe line steel C type impurities, adds al-killed in converter tapping process, adds manganese class and other alloys, be not added with ferrosilicon.LF stoves are in temperature-rise period plus aluminium carries out top slag modification, and ferrosilicon strong mixing desulfurization is added when molten steel and top slag color becomes blackish green.According to molten steel sample inspection result after desulfurization, Adding Fesi, ferromanganese.The pipe line steel steel plate produced using the method for the present invention, is not found silicate C type impurities, can effectively improve the inherent quality of pipe line steel steel plate after inspection.
Description
Technical field
The invention belongs to molten steel refining technology field, more particularly to a kind of reduction pipe line steel molten steel silicate C type impurities
Method.
Background technology
Find that steel plate has silicate C type impurities, this field trash to influence the HIC of pipe line steel after the pipeline steel rolling of production
With SSC performances.Finding pipe line steel DWTT fractures by inspection, there are the Silicate inclusion objects of bulky grain.There are silicic acid for pipe line steel
Salt type impurity should be related with tapping deoxidization and top slag modification degree.If the Antaciron being added participates in deoxidation, deoxidation is generated
Product SiO2, part deoxidation products form compound C type oxides with other field trashes and are mingled with, and part deoxidation products is in molten steel
It constantly grows up, forms individual particle field trash and be trapped in steel.Deoxidation of molten steel optimization and top slag modification are carried out, by reducing silicate
Production quantity and the enhancing top slag ability that is mingled with of absorption improve the degree of purity of pipe line steel.
Invention content
The purpose of the present invention is intended to reduce pipe line steel C type impurities, improves the quality of pipe line steel.
For this purpose, the technical solution that the present invention is taken is：
A method of pipe line steel C type impurities are reduced, are produced according to the technique of LD+LF+RH+CC, specially：
(1) converter molten steel alloying
Converter molten steel alloy addition sequence is：Aluminum steel section, manganese alloy, silicon alloy and other alloys；Molten steel calmness adds aluminum amount
=tapping oxygen value × 0.0016 × Metal Weight+(250~400), wherein adding aluminum amount units/kg, tap oxygen value unit ppm, molten steel
Unit of weight t, control argon station molten steel aluminium content is 0.03~0.06%；Manganese, silicon class alloy are carried out according to 100% recovery rate of alloy
In finished product ingredient, lower limit with addition of.
(2) heating of LF stoves, top slag modification
LF stoves enter the station after 1~3min of Argon stirring, 2 batches of slag charges of addition, every batch of 450~650kg of lime, and fluxing slag 110~
140,1~3min of time interval is added per batch of material；80~90Nm of big argon gas after charging3/ h heats up after stirring 2~4min, heats up
10min slag removing samples are added aluminum steel 100~250kg of section, stir 2~4min sample examinations if slag specimen color is black；Such as steel
Coolant-temperature gage is relatively low, can not sample and continue to heat up；Subsequent temperature of continuing rising is sampled, is added in batches by first slag charge quantity in temperature-rise period
Enter slag charge, overall control is added in 1950~3000kg in slag charge；Slag specimen is taken after heating every time, slag specimen color is observed, aluminium is added to change
It is upright until slag specimen color becomes blackish green；Later stage 0~90kg of every batch of aluminium addition.
(3) desulfurization of LF stoves, alloying, net Argon
Temperature reaches 1600~1640 DEG C, and strong mixing desulfurization 10~15min samplings ensure that top slag slag specimen is that bright color is white
Slag；If top slag does not reach requirement, it can continue to improve slag charge addition batch or extend desulfurization time；Desulfurization end temp reaches temperature
Manganese, alloying with silicon are carried out after 1630~1660 DEG C of degree；Net 2~5min of Argon after manganese, alloying with silicon forbids after manganese, alloying with silicon
It is heated up again；Net 3~8min of Argon, moves out RH Dehydroepiandrosterone derivatives after 200~800m of line feeding.
Beneficial effects of the present invention are：
After being produced using present invention process method, pipe line steel steel plate field trash is examined, does not find silicate C type impurities,
To greatly improve the inherent quality of pipe line steel steel plate.
Specific implementation mode
The present invention is produced according to the technique of LD+LF+RH+CC, using 260t ladles.
Embodiment 1：
(1), converter molten steel alloying
In converter tapping process plus al-killed, converter molten steel alloy addition sequence are：Aluminum steel section, manganese alloy, silicon alloy and
Other alloys.Tap oxygen value 600ppm, and Metal Weight 261t adds aluminum amount=600 × 0.0016 × 261+354=604kg.Argon station
Molten steel aluminium content is 0.033%.4830kg is added in low-phosphorous ferromanganese, and 490kg is added in ferrosilicon.
(2), the heating of LF stoves, top slag modification
LF stoves enter the station after Argon stirring 1min, and 2 batches of slag charges are added, and every batch of lime 500kg, fluxing slag 130kg add per batch of material
Angle of incidence interval 2min heats up after charging after big argon gas 88Nm3/h stirrings 3min, and heat up 10min slag removing samples.Aluminum steel section is added
127kg stirs 3min sample examinations；It samples subsequent temperature of continuing rising, slag is added in batches by first slag charge quantity in temperature-rise period
Total amount 2854kg is added in material, slag charge；Slag specimen is taken after heating every time, observes slag specimen color, aluminum steel section 39kg is added.
(3) desulfurization of LF stoves, alloying, net Argon
Temperature reaches 1632 DEG C, and strong mixing desulfurization 10min samplings, top slag slag specimen is bright color white slag.Desulfurization end temp
Manganese, alloying with silicon are carried out after reaching 1644 DEG C of temperature, ferromanganese 341kg, ferrosilicon 82kg is added.Net Argon after manganese, alloying with silicon
3min.Net Argon 5min, moves out RH Dehydroepiandrosterone derivatives after line feeding 800m.
Embodiment 2：
(1), converter molten steel alloying
In converter tapping process plus al-killed, converter molten steel alloy addition sequence are：Aluminum steel section, manganese alloy, silicon alloy and
Other alloys.Tap oxygen value 469ppm, and Metal Weight 245t adds aluminum amount=469 × 0.0016 × 245+325=508kg.Argon station
Molten steel aluminium content is 0.055%.Manganese alloy：Low-phosphorous ferromanganese 4290kg, mid-carbon fe-mn 890kg.Ferrosilicon 590kg.
(2), the heating of LF stoves, top slag modification
LF stoves enter the station after Argon stirring 1min, and 2 batches of slag charges are added, and every batch of lime 600kg, fluxing slag 160kg add per batch of material
Angle of incidence interval 2min heats up after charging after big argon gas 88Nm3/h stirrings 2min, and heat up 10min slag removing samples.Aluminum steel section is added
The subsequent temperature of continuing rising of 191kg, is added slag charge in temperature-rise period in batches by first slag charge quantity, and total amount 2946kg is added in slag charge；
Slag specimen is taken after heating every time, observes slag specimen color, aluminum steel section 54kg is added.
(3) desulfurization of LF stoves, alloying, net Argon
Temperature reaches 1617 DEG C, and strong mixing desulfurization 10min samplings, top slag slag specimen is bright color white slag.Desulfurization end temp
Alloying with silicon is carried out after reaching 1657 DEG C of temperature, ferrosilicon 149kg is added, manganese alloy has complied with standard, so without manganese alloy
Change.Net Argon 5min after alloying with silicon.Net Argon 5min, moves out RH Dehydroepiandrosterone derivatives after line feeding 240m.
Claims (1)
1. a kind of method reducing pipe line steel C type impurities, is produced according to the technique of LD+LF+RH+CC, it is characterised in that：
(1) converter molten steel alloying
Converter molten steel alloy addition sequence is：Aluminum steel section, manganese alloy, silicon alloy and other alloys；Molten steel calmness adds aluminum amount=go out
Steel oxygen value × 0.0016 × Metal Weight+(250~400), wherein adding aluminum amount units/kg, tap oxygen value unit ppm, Metal Weight
Unit t, control argon station molten steel aluminium content is 0.03~0.06%；Manganese, silicon class alloy carry out finished product according to 100% recovery rate of alloy
In ingredient, lower limit with addition of；
(2) heating of LF stoves, top slag modification
LF stoves enter the station after 1~3min of Argon stirring, 2 batches of slag charges of addition, every batch of 450~650kg of lime, fluxing slag 110~140,
1~3min of time interval is added per batch of material；80~90Nm of big argon gas after charging3/ h heats up after stirring 2~4min, and heat up 10min
Slag removing sample is added aluminum steel 100~250kg of section, stirs 2~4min sample examinations if slag specimen color is black；Such as liquid steel temperature
It is relatively low, it can not sample and continue to heat up；It samples subsequent temperature of continuing rising, slag is added in batches by first slag charge quantity in temperature-rise period
Overall control is added in 1950~3000kg in material, slag charge；Slag specimen is taken after heating every time, observes slag specimen color, adds aluminium modification straight
Until slag specimen color becomes blackish green；Later stage 0~90kg of every batch of aluminium addition；
(3) desulfurization of LF stoves, alloying, net Argon
Temperature reaches 1600~1640 DEG C, and strong mixing desulfurization 10~15min samplings ensure that top slag slag specimen is bright color white slag；Such as
Fruit top slag does not reach requirement, can continue to improve slag charge addition batch or extend desulfurization time；Desulfurization end temp reaches temperature
Manganese, alloying with silicon are carried out after 1630~1660 DEG C；Net 2~5min of Argon after manganese, alloying with silicon, forbid after manganese, alloying with silicon into
Row heats up again；Net 3~8min of Argon, moves out RH Dehydroepiandrosterone derivatives after 200~800m of line feeding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201710064823.4A CN108396106B (en) | 2017-02-05 | 2017-02-05 | A method of reducing pipe line steel C type impurity |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710064823.4A CN108396106B (en) | 2017-02-05 | 2017-02-05 | A method of reducing pipe line steel C type impurity |
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| CN108396106B CN108396106B (en) | 2019-08-27 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104498663A (en) * | 2014-12-27 | 2015-04-08 | 首钢总公司 | Smelting process of hydrogen-induced cracking resistant vessel steel |
| CN104630418A (en) * | 2015-01-15 | 2015-05-20 | 南京钢铁股份有限公司 | High-cleanliness pipeline steel smelting process |
| CN106222562A (en) * | 2016-09-26 | 2016-12-14 | 南京钢铁股份有限公司 | A kind of manufacture method of heavy wall large-caliber high-steel grade pipe line steel |
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- 2017-02-05 CN CN201710064823.4A patent/CN108396106B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104498663A (en) * | 2014-12-27 | 2015-04-08 | 首钢总公司 | Smelting process of hydrogen-induced cracking resistant vessel steel |
| CN104630418A (en) * | 2015-01-15 | 2015-05-20 | 南京钢铁股份有限公司 | High-cleanliness pipeline steel smelting process |
| CN106222562A (en) * | 2016-09-26 | 2016-12-14 | 南京钢铁股份有限公司 | A kind of manufacture method of heavy wall large-caliber high-steel grade pipe line steel |
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| CN108396106B (en) | 2019-08-27 |
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