CN104975130B - Method for controlling purity of heavy rail steel - Google Patents
Method for controlling purity of heavy rail steel Download PDFInfo
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- CN104975130B CN104975130B CN201510427600.0A CN201510427600A CN104975130B CN 104975130 B CN104975130 B CN 104975130B CN 201510427600 A CN201510427600 A CN 201510427600A CN 104975130 B CN104975130 B CN 104975130B
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Abstract
The invention discloses a method for controlling the purity of heavy rail steel. The method includes the following steps of converter smelting, ladle furnace (LF) refining, Ruhrstahl Heraeus (RH) vacuum treatment and continuous casting. By the adoption of the refining method that active lime is used in the process of a converter and active lime, silicon carbide and quartz sand are used for slagging in the refining process, the sulphur content of prepared heavy rail steel continuous casting billets is controlled to be equal to or smaller than 0.006%, and all grades of inclusions in the heavy rail steel are equal to or lower than 2.0. According to the method for controlling the purity of the heavy rail steel, relatively high basicity is adopted, desulphurization efficiency is high and stable, and the method can obviously reduce various inclusions in molten steel.
Description
Technical field
The present invention relates to a kind of smelting iron and steel technical field, be specifically related to a kind of side controlling Properties of Heavy Rail Steel degree of purity
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 a kind of Properties of Heavy Rail Steel degree of purity of controlling
Method.In steel prepared by the method, sulfur content meets less than or equal to 0.006%, and the grading of steel field trash is the least
≤2.0；And the method is while controlling S content, also controls other kinds of field trash, it is adaptable to raw
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 a kind of method controlling Properties of Heavy Rail Steel degree of purity, the method flow process is: converter smelting →
LF stove refine → RH application of vacuum → continuous casting.The present invention uses and uses active lime in kiln process,
In refining process, use active lime, carborundum and the method for refining of quartz sand slag making thereof, control to be prepared into
Properties of Heavy Rail Steel continuous casting billet sulfur content≤0.006% arrived, and in Properties of Heavy Rail Steel the every grading of field trash all≤2.0 grades.
A kind of method controlling Properties of Heavy Rail Steel degree of purity, it comprises the following steps:
A, converter smelting
First, in converter, add the molten iron of mass content≤0.02% of S, carry out converter smelting；Converter smelting
After refining terminates, molten steel tapping process adds calsibar alloy and carries out deoxidation, be simultaneously introduced active lime；
After tapping terminates, to one layer of Acetylenogen. of ladle top of the slag uniform fold；Then ladle bottom blowing argon is carried out at least
5min, 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 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 subsequently adding Acetylenogen. and continues refine；Refine 10min again
After, adjusting blowing argon gas flow is 100～150NL/min, is then sequentially added into quartz sand, carborundum continuation essence
Refining, when molten steel temperature is heated to 1570～1600 DEG C, the flow adjusting blowing argon gas is 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 gas flow is 1200～1500NL/min, and vacuum is less than 300Pa；When application of vacuum 15～
After 18min, keep vacuum, be subsequently adding alloy and carry out Alloying Treatment；After alloying, circular treatment
More than 5min, treats that composition is uniform, vacuum breaker；Then the bar that blowing argon gas flow is 50～80NL/min is adjusted
Carrying out more than argon bottom-blowing 5min under part, molten steel sets off；
D, continuous casting
The molten steel processing step C carries out continuous casting rolling, produces Properties of Heavy Rail Steel.
The present invention further technical scheme, the addition of the most described calsibar alloy is per ton
Molten steel adds 2.5～3.5kg；The addition of described active lime is that molten steel per ton adds 3～5kg；Described carbon
The addition changing calcium is that molten steel per ton adds 0.2～0.4kg.
The present invention further technical scheme, 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；The first time addition of described Acetylenogen. is that molten steel per ton adds 0.2～0.4kg, the
Secondary addition is that molten steel per ton adds 0.2～0.4kg；The first time addition of described carborundum is molten steel per ton
Addition 0.2～0.4kg, for the second time addition are that molten steel per ton adds 0.2～0.4kg；Adding of described quartz sand
Entering amount is that molten steel per ton adds 0.5～1kg.
Will be described in detail the present invention below.
A kind of method controlling Properties of Heavy Rail Steel degree of purity, it comprises the following steps:
A, converter smelting
First, in converter, add the molten iron of mass content≤0.02% of S, carry out converter smelting；Converter smelting
After refining terminates, molten steel tapping process adds calsibar alloy and carries out deoxidation, be simultaneously introduced active lime；
After tapping terminates, to one layer of Acetylenogen. of ladle top of the slag uniform fold；Then ladle bottom blowing argon is carried out at least
5min, the flow-control of described blowing argon gas is 50～80NL/min；
In step, use the molten iron of sulfur content≤0.02%, be the sulfur content in order to control in molten steel, protect
Card raw material sulfur content from the beginning is the most relatively low, and so control raw material basicity is 3～about 4, further,
The desulfuration efficiency of the present invention is high and stable, and can act as significantly improving to type impurity each with molten steel
Effect, and be not only to A type impurity.It addition, use active lime to be because living in kiln process
Property Calx crystal grain tiny, activity degree is high, has slagging speed fast, the metallurgy characteristics such as desulfuration, phosphorus are effective.
This step uses the molten iron of relatively low sulfur content, and adds active lime and carry out slagging desulfuration, and this is conducive to
The process of the roguing in later stage.The present invention uses existing calsibar alloy deoxidizer deoxidation, and it is a kind of aluminum-free
Deoxidization technique, can control the field trash in Properties of Heavy Rail Steel further.
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 subsequently adding Acetylenogen. and continues refine；Refine 10min again
After, adjusting blowing argon gas flow is 100～150NL/min, is then sequentially added into quartz sand, carborundum continuation essence
Refining, when molten steel temperature is heated to 1570～1600 DEG C, the flow adjusting blowing argon gas is 50～80NL/min,
Argon bottom-blowing 6～10min under this flow, molten steel sets off；
In stepb, the present invention points out, the later stage must use carborundum, quartz sand etc. to reduce ladle slag alkali
The slag charge of degree, controls basicity in the range of 1.5～2.0, while controlling MnS field trash, also controls
Other kinds of field trash.
The present invention carries out interpolation active lime in batches, Acetylenogen., carborundum, quartz sand, is for layer
Layer roguing, but under the stage, the kind of roguing is different, it is ensured that various types of field trashes are the most effectively controlled
System, the effect of such removal of inclusions is better.
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 gas flow is 1200～1500NL/min, and vacuum is less than 300Pa；When application of vacuum 15～
After 18min, keep vacuum, be subsequently adding alloy and carry out Alloying Treatment；After alloying, circular treatment
More than 5min, treats that composition is uniform, vacuum breaker；Then the bar that blowing argon gas flow is 50～80NL/min is adjusted
Carrying out more than argon bottom-blowing 5min under part, molten steel sets off；
D, continuous casting
The molten steel processing step C carries out continuous casting rolling, produces Properties of Heavy Rail Steel.
The present invention further technical scheme, the addition of the most described calsibar alloy is per ton
Molten steel adds 2.5～3.5kg；The addition of described active lime is that molten steel per ton adds 3～5kg；Described carbon
The addition changing calcium is that molten steel per ton adds 0.2～0.4kg.
The present invention further technical scheme, 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；The first time addition of described Acetylenogen. is that molten steel per ton adds 0.2～0.4kg, the
Secondary addition is that molten steel per ton adds 0.2～0.4kg；The first time addition of described carborundum is molten steel per ton
Addition 0.2～0.4kg, for the second time addition are that molten steel per ton adds 0.2～0.4kg；Adding of described quartz sand
Entering amount is that molten steel per ton adds 0.5～1kg.
Detected by the Properties of Heavy Rail Steel that the method using the present invention to provide is prepared, use this technique to produce
Rail sulfur content≤0.006%, the every grading of field trash is respectively less than or equal to 2.0 grades, and T [O] is all≤15 × 10-6。
In the present invention, to active lime, Acetylenogen., carborundum, quartz sand addition number, certainly
Having determined the number of the removal amount of field trash, suitable addition can be removed more field trash as far as possible, obtain
Obtain the Properties of Heavy Rail Steel of relatively high cleanliness.
[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 that molten steel S content can be reduced to≤0.006% and ensure that steel press from both sides
Foreign material grade all≤2.0 grades.And the method for the present invention is applicable to produce high-quality 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, meanwhile, it is every for adding active lime in ladle
Ton molten steel adds 5kg.After tapping terminates, being uniformly added into Acetylenogen. to the ladle top of the slag is that molten steel per ton adds
0.2kg.In above-mentioned tapping process, ladle bottom blowing argon flow amount uses 60NLl/min.After tapping terminates, use
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, slag charge proceeds refine after adding；Again after refine 10min, by ladle bottom blowing argon flow amount
It is adjusted to 100NL/min, in ladle, adds quartz sand molten steel per ton add 0.5kg, carborundum molten steel per ton
Adding 0.2kg, then proceed to add heat refining, after refine 8min, molten steel temperature reaches 1575 DEG C.Now,
Ladle bottom blowing argon flow amount is adjusted to 80NL/min, and sample analysis now molten steel S content is 0.006%, steel
Liquid 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 2.0 grades that is rated of field trash, B class, C class, D class are
0.5 grade, T [O] average out to 12.4 × 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.Meanwhile, in ladle, active lime molten steel per ton is added
5kg.After tapping terminates, it is uniformly added into Acetylenogen. molten steel per ton 0.4kg to the ladle top of the slag.Above-mentioned tapping process
Middle ladle bottom blowing argon flow amount uses 60NL/min.After tapping terminates, use the BOTTOM ARGON BLOWING stream of 50NL/min
Amount 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, and slag charge adds
Refine is proceeded after complete；Again after refine 10min, ladle bottom blowing argon flow amount is adjusted to 100NL/min,
In ladle, add quartz sand molten steel per ton 0.75kg, carborundum molten steel per ton 0.4kg, then proceed to heating essence
Refining, after refine 8min, molten steel temperature reaches 1580 DEG C.Now, ladle bottom blowing argon flow amount is adjusted to
80NL/min, sample analysis now molten steel S content is 0.005%, and 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 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 1.5 grades that is rated of field trash, B class, C class, D class are
0.5 grade, T [O] average out to 10.6 × 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.Meanwhile, in ladle, active lime molten steel per ton 3kg is added.Go out
After steel terminates, it is uniformly added into Acetylenogen. molten steel per ton 0.3kg to the ladle top of the slag.Ladle Bottom in above-mentioned tapping process
Blowing argon gas flow uses 60NL/min.After tapping terminates, use 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, 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, slag in ladle
Material proceeds refine after adding；Again after refine 10min, ladle bottom blowing argon flow amount is adjusted to
100NL/min, adds quartz sand molten steel per ton 1.0kg, carborundum molten steel per ton 0.3kg, then in ladle
Continuing to add heat refining, after refine 8min, molten steel temperature reaches 1577 DEG C.Now, by steel ladle bottom argon blowing air-flow
Amount is adjusted to 80NL/min, and sample analysis now molten steel S content is 0.005%, and molten steel LF sets off and is sent to
RH 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 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 2.0 grades that is rated of field trash, B class, C class, D class are
0.5 grade, T [O] average out to 11.3 × 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 (4)
1. the method controlling Properties of Heavy Rail Steel degree of purity, it is characterised in that it comprises the following steps:
A, converter smelting
First, in converter, add the molten iron of mass content≤0.02% of S, carry out converter smelting；Converter
After smelting terminates, molten steel tapping process adds calsibar alloy and carries out deoxidation, be simultaneously introduced active lime；
After tapping terminates, to one layer of Acetylenogen. of ladle top of the slag uniform fold；Then ladle bottom blowing argon is carried out at least
5min, 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 subsequently adding Acetylenogen. and continues refine；Essence again
After refining 10min, adjusting blowing argon gas flow is 100～150NL/min, is then sequentially added into quartz sand, carbon
SiClx continue refine, when molten steel temperature is heated to 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 gas flow is 1200～1500NL/min, and vacuum is less than 300Pa；When application of vacuum 15～
After 18min, keep vacuum, be subsequently adding alloy and carry out Alloying Treatment；After alloying, circular treatment
More than 5min, treats that composition is uniform, vacuum breaker；Then the bar that blowing argon gas flow is 50～80NL/min is adjusted
Carrying out more than argon bottom-blowing 5min under part, molten steel sets off；
D, continuous casting
The molten steel processing step C carries out continuous casting rolling, produces Properties of Heavy Rail Steel.
The method of control Properties of Heavy Rail Steel degree of purity the most according to claim 1, it is characterised in that in step
The addition of described calsibar alloy is that molten steel per ton adds 2.5～3.5kg；The addition of described active lime
Amount adds 3～5kg for molten steel per ton；The addition of described Acetylenogen. be molten steel per ton add 0.2～
0.4kg。
The method of control Properties of Heavy Rail Steel degree of purity 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 method of control Properties of Heavy Rail Steel degree of purity 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；The first time of described Acetylenogen. adds
Amount is that molten steel per ton adds 0.2～0.4kg for molten steel per ton addition 0.2～0.4kg, for the second time addition；
The first time addition of described carborundum is that molten steel per ton addition 0.2～0.4kg, for the second time addition are
Molten steel per ton adds 0.2～0.4kg；The addition of described quartz sand is that molten steel per ton adds 0.5～1kg.
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| CN109022661B (en) * | 2017-06-12 | 2020-06-23 | 鞍钢股份有限公司 | Method for reducing heavy rail steel rail damage rate |
| 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 |
| CN108866276A (en) * | 2018-07-26 | 2018-11-23 | 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 |
| CN108754073A (en) * | 2018-07-26 | 2018-11-06 | 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 |
| 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 |
| CN109207669A (en) * | 2018-09-25 | 2019-01-15 | 武汉钢铁有限公司 | The method of refining of high speed heavy rail steel |
| CN112481440A (en) * | 2020-11-24 | 2021-03-12 | 攀钢集团攀枝花钢铁研究院有限公司 | Pitting-resistant steel rail and preparation method thereof |
| CN114058784A (en) * | 2021-11-11 | 2022-02-18 | 攀钢集团攀枝花钢铁研究院有限公司 | Magnesium-containing composite cored wire for steel rail production, steel rail and production method thereof |
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| CN102242241A (en) * | 2011-06-02 | 2011-11-16 | 内蒙古包钢钢联股份有限公司 | Method for controlling excessive impurity in heavy rail steel with operation speed of 350 kilometer/hour and over |
| CN102864275A (en) * | 2012-09-25 | 2013-01-09 | 鞍钢股份有限公司 | Control method of aluminum content of heavy rail steel |
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