CN104975136B - A kind of control method of inclusion in heavy rail thing - Google Patents
A kind of control method of inclusion in heavy rail thing Download PDFInfo
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- CN104975136B CN104975136B CN201510427458.XA CN201510427458A CN104975136B CN 104975136 B CN104975136 B CN 104975136B CN 201510427458 A CN201510427458 A CN 201510427458A CN 104975136 B CN104975136 B CN 104975136B
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Abstract
The invention discloses the control method of a kind of inclusion in heavy rail thing.The invention provides the control method of a kind of inclusion in heavy rail thing.The method flow process is: converter smelting → LF stove refine → RH application of vacuum → continuous casting.The present invention is by using active lime, carborundum and the method for refining of quartz sand slag making in using active lime, refining process in converter, control the mass content of S in molten steel and be reduced to less than 0.006%, and ensure that the grading of steel field trash is respectively less than or equal to 2.0 grades.The present invention uses of a relatively high basicity, and desulfuration efficiency is high and stable, and type impurity each for molten steel all serves obvious improvement result.
Description
Technical field
The present invention relates to a kind of smelting iron and steel technical field, be specifically related to the controlling party of a kind of inclusion in heavy rail thing
Method.
Background technology
Rail be railroad track mainly comprise parts, in railway transport course, locomotive is provided effectively
Support and guiding, be subjected to the huge lateral pressure from wheel.Based on China's capital construction growth requirement, ferrum
Road transport is just with swift and violent speed development, and constantly tends to high speed, heavy loading.This is undoubtedly to rail quality
Propose more harsh requirement.Rail, contacting with wheel when, subjects locomotive winding reciprocal and many
The load become, its degree of purity is for fatigue endurance important.
Due to steel inclusion inhibition successional to steel matrix so that steel rolling processing,
Heat treatment and use during separate with field trash, cause gap to produce, to steel mechanics performance,
The indexs such as corrosion resistance produce negative influence.Especially, for the production of rail, the rolling of its aximal deformation value,
Rail is mingled with by the series of influence factors such as complicated Technology for Heating Processing, special stress condition and climatic environment
Grading unfavorable, more directly service life is created harmful effect.And press from both sides for point-like in Properties of Heavy Rail Steel
Miscellaneous control, the always object of metallargist's research.
The patent of Patent No. CN102732667A discloses a kind of method of Properties of Heavy Rail Steel refine desulfurization rapidly,
The method makes Properties of Heavy Rail Steel realize quickly reducing MnS field trash in LF stove, but this patent does not accounts for
Other field trashes.The patent of Patent No. CN104313245A discloses a kind of Properties of Heavy Rail Steel refine desulfurization rapidly
Method, while the method makes Properties of Heavy Rail Steel realize desulfurization rapidly in LF stove, reduce Properties of Heavy Rail Steel A class folder
The rank of foreign material, but this patent desulfuration efficiency is relatively low, only to A type impurity effect.
Summary of the invention
[solving the technical problem that]
Present invention aim to address above-mentioned problem of the prior art, it is provided that the control of a kind of inclusion in heavy rail thing
Method.In steel prepared by the method, sulfur content meets less than or equal to 0.006%, and the method is controlling S
While content, also control other kinds of field trash, it is adaptable to produce high-quality rail steel.
[technical scheme]
In order to reach above-mentioned technique effect, the present invention takes techniques below scheme:
The invention provides the control method of a kind of inclusion in heavy rail thing.The method flow process is: converter smelting →
LF stove refine → RH application of vacuum → continuous casting.The present invention is by using active lime, refine in converter
During use active lime, carborundum and the method for refining of quartz sand slag making, control S in molten steel
Mass content be reduced to less than 0.006%, and ensure that the grading of steel field trash is respectively less than or equal to 2.0
Level.
A kind of control method of inclusion in heavy rail thing, it comprises the following steps:
A, converter smelting
First, the mass content adding S in converter is less than or equal to the molten iron of 0.02%, carries out converter smelting；
After converter smelting terminates, tapping process adds calsibar alloy and carries out deoxidation；After tapping a period of time,
Active lime is added in ladle；After tapping terminates, to one layer of Acetylenogen. of ladle top of the slag uniform fold；Then
Carry out argon bottom-blowing 5min and more than, the flow-control of described blowing argon gas is 50～80NL/min；
B, LF stove refine
After completing the process of step A, the molten steel in ladle is sent to LF stove and carries out refine；Molten steel is vertical after entering the station
I.e. argon bottom-blowing, the flow-control of described blowing argon gas is 150～200NL/min, when argon bottom-blowing 2～3min
After, in ladle, addition active lime, Acetylenogen., carborundum carry out refine successively；After refine 10min,
The flow adjusting blowing argon gas is 100～200NL/min, is then sequentially added into Acetylenogen., carborundum continuation refine；
Again after refine 10min, adjusting blowing argon gas flow is 100～150NL/min, adds quartz sand and continues refine,
When molten steel temperature is 1570～1600 DEG C, the flow adjusting blowing argon gas is 50～80NL/min, at this flow
Lower argon bottom-blowing 6～10min, molten steel sets off；
C, RH application of vacuum
After the molten steel that step B processes enters the station, molten steel is carried out application of vacuum；In vacuum treated whole process
In, controlling lift gas flow is 1200～1500NL/min, and vacuum is less than 300Pa；Work as application of vacuum
After 15～18min, keep vacuum, be subsequently adding alloy and carry out Alloying Treatment；After alloying, at circulation
Reason more than 5min, treats that composition is uniform, vacuum breaker；Then adjusting blowing argon gas flow is 50～80NL/min
Under the conditions of carry out more than argon bottom-blowing 5min, molten steel sets off；
D, continuous casting
The molten steel processing step C carries out continuous casting.
The present invention further technical scheme, in step, the addition of described active lime is per ton
Molten steel adds 3～5kg active limes；The addition of described Acetylenogen. is that molten steel per ton adds 0.2～0.4kg carbon
Change calcium.
The present invention further technical scheme, in step, described tapping a period of time refers to when tapping
It is 90 ton hours.
The present invention further technical scheme, is in step A and step B, described Acetylenogen. is CaC2
The mass content Acetylenogen. more than 98%.
The present invention further technical scheme, in stepb, the addition of described active lime is per ton
Molten steel adds 2～3kg active limes；The first time addition of described Acetylenogen. be molten steel per ton add 0.2～
0.4kg Acetylenogen., for the second time addition are that molten steel per ton adds 0.2～0.4kg Acetylenogen.；Described carborundum
For the first time addition be molten steel per ton add 0.2～0.4kg carborundum, for the second time addition be that molten steel per ton adds
Enter 0.2～0.4kg carborundum；The addition of described quartz sand is that molten steel per ton adds 0.5～1kg quartz sand.
Will be described in detail the present invention below.
A kind of control method of inclusion in heavy rail thing, it comprises the following steps:
A, converter smelting
First, the mass content adding S in converter is less than or equal to the molten iron of 0.02%, carries out converter smelting；
After converter smelting terminates, tapping process adds calsibar alloy and carries out deoxidation；After tapping a period of time,
Active lime is added in ladle；After tapping terminates, to one layer of Acetylenogen. of ladle top of the slag uniform fold；Then
Carry out argon bottom-blowing 5min and more than, the flow-control of described blowing argon gas is 50～80NL/min；
The present invention is less than or equal to the molten iron of 0.02% in step by the mass content of S, is to improve
Rail steel molten steel cleanness, the rank of stability contorting rail field trash.
The present invention uses existing calsibar alloy deoxidizer deoxidation, and it is a kind of al-free deoxidation technique, can enter
One step controls the field trash in Properties of Heavy Rail Steel.And in step, tapping process need to ensure the stream of argon bottom-blowing
Amount controls equally 50～80NL/min.The use of active lime is the slag former as steel-making, has shortening
The duration of heat, the raising feature such as molten steel degree of purity and recovery rate.
B, LF stove refine
After completing the process of step A, the molten steel in ladle is sent to LF stove and carries out refine；After molten steel enters the station
Argon bottom-blowing immediately, the flow-control of described blowing argon gas is 150～200NL/min, when argon bottom-blowing 2～3min
After, in ladle, addition active lime, Acetylenogen., carborundum carry out refine successively；After refine 10min,
The flow adjusting blowing argon gas is 100～200NL/min, is then sequentially added into Acetylenogen., carborundum continuation refine；
Again after refine 10min, adjusting blowing argon gas flow is 100～150NL/min, adds quartz sand and continues refine,
When molten steel temperature is 1570～1600 DEG C, the flow adjusting blowing argon gas is 50～80NL/min, at this flow
Lower argon bottom-blowing 6～10min, molten steel sets off；
Step B of the present invention adds the field trash that carborundum can be removed in molten steel as far as possible in batches, increases
It is prepared into the degree of purity of Properties of Heavy Rail Steel.
C, RH application of vacuum
After the molten steel that step B processes enters the station, molten steel is carried out application of vacuum；In vacuum treated whole process
In, controlling lift gas flow is 1200～1500NL/min, and vacuum is less than 300Pa；Work as application of vacuum
After 15～18min, keep vacuum, be subsequently adding alloy and carry out Alloying Treatment；After alloying, at circulation
Reason more than 5min, treats that composition is uniform, vacuum breaker；Then adjusting blowing argon gas flow is 50～80NL/min
Under the conditions of carry out more than argon bottom-blowing 5min, molten steel sets off；
D, continuous casting
The molten steel processing step C carries out continuous casting.
The present invention further technical scheme, in step, the addition of described active lime is per ton
Molten steel adds 3～5kg active limes；The addition of described Acetylenogen. is that molten steel per ton adds 0.2～0.4kg carbon
Change calcium.
The present invention add in step the purpose of active lime and Acetylenogen. be control molten steel basicity be 3～4.
The present invention further technical scheme, in step, described tapping a period of time refers to when tapping
It is 90 ton hours.
The present invention further technical scheme, is in step A and step B, described Acetylenogen. is CaC2
The mass content Acetylenogen. more than 98%.Requirement for the purity of Acetylenogen. is to preferably control to be mingled with
Thing.
The present invention further technical scheme, in stepb, the addition of described active lime is per ton
Molten steel adds 2～3kg active limes；The first time addition of described Acetylenogen. be molten steel per ton add 0.2～
0.4kg Acetylenogen., for the second time addition are that molten steel per ton adds 0.2～0.4kg Acetylenogen.；Described carborundum
For the first time addition be molten steel per ton add 0.2～0.4kg carborundum, for the second time addition be that molten steel per ton adds
Enter 0.2～0.4kg carborundum；The addition of described quartz sand is that molten steel per ton adds 0.5～1kg quartz sand.
It is to be 1.5～2 to control basicity to the refining process of step B adds materials in batches.
Detected by the rail that the method using the present invention to provide is prepared, use the steel that this technique produces
Rail sulfur content is less than or equal to 0.006%, and the every grading of field trash is respectively less than or equal to 2.0 grades, T [O] is the least
In or equal to 15 × 10-6。
[beneficial effect]
The present invention compared with prior art, has a following beneficial effect:
The present invention uses of a relatively high basicity, and desulfuration efficiency is high and stable, and is mingled with for molten steel is all kinds of
Thing all serves obvious improvement result.
Use the method for the invention molten steel S content can be reduced to less than or equal to 0.006% and be protected
Card steel field trash grading is respectively less than or equal to 2.0 grades.And the method for the present invention is applicable to produce high-quality steel
Rail steel.
Detailed description of the invention
Below in conjunction with embodiments of the invention, the invention will be further elaborated.
Embodiment 1:
A, converter smelting
Enter the molten iron of converter be S content be 0.016%, after converter smelting terminates, start tapping, tapping process
Adding calsibar alloy in ladle and carry out deoxidation, addition is that molten steel per ton adds 2.5kg Si-Ca-Ba, silico-calcium
Barium adds steel grade other alloys required immediately after having added.When tapping is 90 ton hours, add in ladle and live
Property Calx be molten steel per ton add 5kg.After tapping terminates, being uniformly added into Acetylenogen. to the ladle top of the slag is steel per ton
Liquid adds 0.2kg.In above-mentioned tapping process, ladle bottom blowing argon flow amount uses 60NL/min.After tapping terminates,
Using BOTTOM ARGON BLOWING flow Argon 6min of 50NL/min, then molten steel is sent to LF refine.
B, LF stove refine
Molten steel is connected BOTTOM ARGON BLOWING after standing to LF and is carried out steel ladle bottom argon blowing, and argon blowing rate uses 150NL/min, blows
After argon 2min, in ladle, add active lime molten steel per ton successively add 2.0kg, Acetylenogen. molten steel per ton
Add 0.2kg, carborundum molten steel per ton adds 0.2kg, and slag charge continues heating refine after adding；Refine 10min
After, ladle bottom blowing argon flow amount is adjusted to 150NL/min, in ladle, then adds Acetylenogen. molten steel per ton
Adding 0.4kg, add carborundum molten steel per ton addition 0.2kg, slag charge proceeds refine after adding；Again
After refine 10min, ladle bottom blowing argon flow amount is adjusted to 100NL/min, in ladle, adds quartz sand
Molten steel per ton adds 1.0kg, then proceedes to add heat refining, and after refine 8min, molten steel temperature reaches 1575 DEG C.
Now, ladle bottom blowing argon flow amount being adjusted to 80NL/min, sample analysis now molten steel S content is 0.006%,
Molten steel LF sets off and is sent to RH and carries out application of vacuum.
C, RH application of vacuum
Molten steel to after RH vacuum station, sets RH and inserts pipe lift gas flow as 1500NL/min, start
Evacuation, 3min final vacuum degree reaches 100Pa and stable carries out application of vacuum in this value, when treated between
During for 18min, keep vacuum, add carburant 50kg, ferromanganese 100kg, after alloy adds, circulation
Process 7min, make composition uniform, vacuum breaker.Then blowing argon gas 6min；
D, continuous casting
Molten steel is sent to continuous casting working procedure, produces into 280 × 380mm bloom continuous casting base product, continuous casting billet product
By rolling mill practice, produce into the rail steel of 60kg/m.
Detected by this rail that the method using the present invention to provide is prepared, use this technique to produce
In rail, sulfur content is 0.006%, and the every A class 1.5 grades that is rated of field trash, B class, C class, D class are
0.5 grade, T [O] average out to 11.7 × 10-6。
Embodiment 2
A, converter smelting
Enter the molten iron of converter be S content be 0.020%, after converter smelting terminates, start tapping, tapping process
Adding calsibar alloy in ladle and carry out deoxidation, addition is molten steel 3.5kg Si-Ca-Ba per ton, and Si-Ca-Ba adds
Steel grade other alloys required are added immediately after having entered.When tapping is 90 ton hours, in ladle, add activity stone
Ash molten steel 5kg per ton.After tapping terminates, it is uniformly added into Acetylenogen. molten steel per ton 0.4kg to the ladle top of the slag.On
State ladle bottom blowing argon flow amount in tapping process and use 60NL/min.After tapping terminates, use 50NL/min
BOTTOM ARGON BLOWING flow Argon 6min, then molten steel is sent to LF refine.
B, LF stove refine
Molten steel is connected BOTTOM ARGON BLOWING after standing to LF and is carried out steel ladle bottom argon blowing, and argon blowing rate uses 150NL/min, blows
After argon 2min, successively in ladle add active lime molten steel per ton 3.0kg, Acetylenogen. molten steel per ton 0.4kg,
Carborundum molten steel per ton 0.4kg, slag charge continues heating refine after adding；After refine 10min, by ladle bottom blowing
Argon flow amount is adjusted to 150NL/min, then adds Acetylenogen. molten steel per ton 0.2kg in ladle, adds carbon
SiClx molten steel per ton 0.2kg, slag charge proceeds refine after adding；Again after refine 10min, by ladle bottom blowing
Argon flow amount is adjusted to 100NL/min, adds quartz sand molten steel per ton 1.0kg, then proceed to add in ladle
Heat refining, after refine 8min, molten steel temperature reaches 1580 DEG C.Now, ladle bottom blowing argon flow amount is adjusted
For 80NL/min, sample analysis now molten steel S content is 0.005%, and molten steel LF sets off and be sent to RH
Row application of vacuum.
C, RH application of vacuum
Molten steel to after RH vacuum station, sets RH and inserts pipe lift gas flow as 1500NL/min, start
Evacuation, 3min final vacuum degree reaches 100Pa and stable carries out application of vacuum in this value, when treated between
During for 17min, keep vacuum, add carburant 70kg, ferromanganese 120kg, after alloy adds, circulation
Process 7min, make composition uniform, vacuum breaker.Then blowing argon gas 6min；
D, continuous casting
Molten steel is sent to continuous casting working procedure, produces into 280 × 380mm bloom continuous casting base product, continuous casting billet product
By rolling mill practice, produce into the rail steel of 60kg/m.
Detected by this rail that the method using the present invention to provide is prepared, use this technique to produce
In rail, sulfur content is 0.005%, and the every A class 1.0 grades that is rated of field trash, B class, C class, D class are
0.5 grade, T [O] average out to 10.2 × 10-6。
Embodiment 3
A, converter smelting
Enter the molten iron of converter be S content be 0.010%, after converter smelting terminates, start tapping, tapping process
Adding calsibar alloy in ladle and carry out deoxidation, addition is molten steel 3.0kg per ton, and Si-Ca-Ba has added
After add steel grade other alloys required immediately.When tapping is 90 ton hours, in ladle, add active lime per ton
Molten steel 3kg.After tapping terminates, it is uniformly added into Acetylenogen. molten steel per ton 0.3kg to the ladle top of the slag.Above-mentioned tapping
During ladle bottom blowing argon flow amount use 60NL/min.After tapping terminates, use the bottom blowing of 50NL/min
Argon flow Argon 6min, then molten steel is sent to LF refine.
B, LF stove refine
Molten steel is connected BOTTOM ARGON BLOWING after standing to LF and is carried out steel ladle bottom argon blowing, and argon blowing rate uses 150NL/min, blows
After argon 2min, successively in ladle add active lime molten steel per ton 3.0kg, Acetylenogen. molten steel per ton 0.3kg,
Adding carborundum molten steel per ton 0.3kg, slag charge continues heating refine after adding；After refine 10min, by ladle
Argon bottom-blowing flow is adjusted to 150NL/min, then adds Acetylenogen. molten steel per ton 0.3kg, carbon in ladle
SiClx molten steel per ton 0.3kg, slag charge proceeds refine after adding；Again after refine 10min, by ladle bottom blowing
Argon flow amount is adjusted to 100NL/min, adds quartz sand molten steel per ton 0.5kg, then proceed to add in ladle
Heat refining, after refine 8min, molten steel temperature reaches 1577 DEG C.Now, ladle bottom blowing argon flow amount is adjusted
For 80NL/min, sample analysis now molten steel S content is 0.005%, and molten steel LF sets off and be sent to RH
Row application of vacuum.
C, RH application of vacuum
Molten steel to after RH vacuum station, sets RH and inserts pipe lift gas flow as 1500NL/min, start
Evacuation, 3min final vacuum degree reaches 100Pa and stable carries out application of vacuum in this value, when treated between
During for 18min, keep vacuum, add carburant 30kg, ferromanganese 80kg, after alloy adds, at circulation
Reason 8min, makes composition uniform, vacuum breaker.Then blowing argon gas 6min；
D, continuous casting
Molten steel is sent to continuous casting working procedure, produces into 280 × 380mm bloom continuous casting base product, continuous casting billet product
By rolling mill practice, produce into the rail steel of 60kg/m.
Detected by this rail that the method using the present invention to provide is prepared, use this technique to produce
In rail, sulfur content is 0.005%, and the every A class 1.5 grades that is rated of field trash, B class, C class, D class are
0.5 grade, T [O] average out to 10.3 × 10-6。
Although reference be made herein to invention has been described for the explanatory embodiment of the present invention, and above-described embodiment is only
For the present invention preferably embodiment, embodiments of the present invention are also not restricted to the described embodiments, it should
Understanding, those skilled in the art can be designed that a lot of other amendments and embodiment, and these are revised and real
The mode of executing will fall within spirit disclosed in the present application and spirit.
Claims (5)
1. the control method of an inclusion in heavy rail thing, it is characterised in that it comprises the following steps:
A, converter smelting
First, the mass content adding S in converter is less than or equal to the molten iron of 0.02%, carries out converter smelting
Refining；After converter smelting terminates, tapping process adds calsibar alloy and carries out deoxidation；Tapping a period of time
After, in ladle, add active lime；After tapping terminates, to one layer of Acetylenogen. of ladle top of the slag uniform fold；
Then carry out argon bottom-blowing 5min and more than, the flow-control of described blowing argon gas is 50～80NL/min；
B, LF stove refine
After completing the process of step A, the molten steel in ladle is sent to LF stove and carries out refine；After molten steel enters the station
Argon bottom-blowing immediately, the flow-control of described blowing argon gas 150～200NL/min, when argon bottom-blowing 2～
After 3min, in ladle, addition active lime, Acetylenogen., carborundum carry out refine successively；Refine 10min
After, the flow adjusting blowing argon gas is 100～200NL/min, is then sequentially added into Acetylenogen., carborundum continues
Continuous refine；Again after refine 10min, adjusting blowing argon gas flow is 100～150NL/min, adds quartz sand
Continue refine, when molten steel temperature is 1570～1600 DEG C, adjust blowing argon gas flow be 50～
80NL/min, argon bottom-blowing 6～10min under this flow, molten steel sets off；
C, RH application of vacuum
After the molten steel that step B processes enters the station, molten steel is carried out application of vacuum；In vacuum treated whole process
In, controlling lift gas flow is 1200～1500NL/min, and vacuum is less than 300Pa；Work as application of vacuum
After 15～18min, keep vacuum, be subsequently adding alloy and carry out Alloying Treatment；After alloying, circulation
Process more than 5min, treat that composition is uniform, vacuum breaker；Then adjusting blowing argon gas flow is 50～80NL/min
Under conditions of carry out more than argon bottom-blowing 5min, molten steel sets off；
D, continuous casting
The molten steel processing step C carries out continuous casting.
The control method of inclusion in heavy rail thing the most according to claim 1, it is characterised in that in step,
The addition of described active lime is that molten steel per ton adds 3～5kg active limes；Adding of described Acetylenogen.
Entering amount is that molten steel per ton adds 0.2～0.4kg Acetylenogen..
The control method of inclusion in heavy rail thing the most according to claim 1, it is characterised in that in step,
Described tapping a period of time refers to that when tapping be 90 ton hours.
The control method of inclusion in heavy rail thing the most according to claim 1, it is characterised in that in step A and
In step B, described Acetylenogen. is CaC2The mass content Acetylenogen. more than 98%.
The control method of inclusion in heavy rail thing the most according to claim 1, it is characterised in that in stepb,
The addition of described active lime is that molten steel per ton adds 2～3kg active limes；The of described Acetylenogen.
Addition is that to add 0.2～0.4kg Acetylenogen., for the second time addition be molten steel per ton to molten steel per ton
Add 0.2～0.4kg Acetylenogen.；The first time addition of described carborundum be molten steel per ton add 0.2～
0.4kg carborundum, for the second time addition are that molten steel per ton adds 0.2～0.4kg carborundum；Described stone
The addition of sand is that molten steel per ton adds 0.5～1kg quartz sand.
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| CN108950119B (en) * | 2018-07-26 | 2020-06-02 | 攀钢集团攀枝花钢铁研究院有限公司 | Smelting method for improving cleanliness of heavy rail steel |
| CN108796173A (en) * | 2018-07-26 | 2018-11-13 | 攀钢集团攀枝花钢铁研究院有限公司 | Improve the smelting process of heavy rail steel cleanness |
| CN108796172A (en) * | 2018-07-26 | 2018-11-13 | 攀钢集团攀枝花钢铁研究院有限公司 | Improve the smelting process of heavy rail steel cleanness |
| CN113999951A (en) * | 2021-11-11 | 2022-02-01 | 攀钢集团攀枝花钢铁研究院有限公司 | Magnesium-containing cored wire for steel rail production, steel rail and production method thereof |
| CN114058932B (en) * | 2021-11-19 | 2023-02-21 | 攀钢集团攀枝花钢铁研究院有限公司 | Heavy rail steel and method for controlling silicate inclusions in production of heavy rail steel |
| CN115418443A (en) * | 2022-08-08 | 2022-12-02 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for controlling cleanliness of high manganese steel |
| CN115491457B (en) * | 2022-10-17 | 2024-04-02 | 山东钢铁股份有限公司 | Converter slagging process applied to deformed steel bar production |
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