CN104975130A - Method for controlling purity of heavy rail steel - Google Patents
Method for controlling purity of heavy rail steel Download PDFInfo
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- CN104975130A CN104975130A CN201510427600.0A CN201510427600A CN104975130A CN 104975130 A CN104975130 A CN 104975130A CN 201510427600 A CN201510427600 A CN 201510427600A CN 104975130 A CN104975130 A CN 104975130A
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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 method controlling Properties of Heavy Rail Steel By purity.
Background technology
Rail is the main building block of railroad track, in railway transport course, provides and effectively supports and guide, need bear the huge lateral pressure from wheel to locomotive.Based on China's capital construction growth requirement, transportation by railroad just with the development of swift and violent speed, and is constantly tending towards high speed, heavy loading.This proposes more harsh requirement to rail quality undoubtedly.Rail, when contacting with wheel, subjects the load that locomotive winding is reciprocal and changeable, and its purity is for fatigue endurance important.
Because steel inclusion is to the successional inhibition of steel matrix, steel is separated with inclusion in rolling processing, thermal treatment and use procedure, causes gap to produce, negative influence is produced to the index such as steel mechanics performance, erosion resistance.Especially, for the production of rail, the grading that the series of influence factors such as its aximal deformation value rolling, complicated thermal treatment process, special stress condition and climatope are mingled with rail is unfavorable, more directly creates detrimentally affect to service life.And for the control of Mechanism of Formation of The Globular Inclusions in Properties of Heavy Rail Steel By, be the object that metallargist studies always.
The patent No. is a kind of method that patent discloses Properties of Heavy Rail Steel By refining desulfurization rapidly of CN102732667A, and the method makes Properties of Heavy Rail Steel By realize reducing MnS inclusion fast in LF stove, but this patent does not consider other inclusiones.The patent No. is a kind of method that patent discloses Properties of Heavy Rail Steel By refining desulfurization rapidly of CN104313245A, while the method makes Properties of Heavy Rail Steel By realize desulfurization rapidly in LF stove, reduce the rank of Properties of Heavy Rail Steel By category-A inclusion, but this patent desulfuration efficiency is lower, only to the effect of category-A inclusion.
Summary of the invention
[technical problem that will solve]
The object of the invention is the problem solving above-mentioned prior art, a kind of method controlling Properties of Heavy Rail Steel By purity is provided.In steel prepared by the method, sulphur content is satisfied is less than or equal to 0.006%, all little≤2.0 of steel inclusion grading; And the method, while control S content, also controls the inclusion of other kinds, be applicable to production high-quality rail steel.
[technical scheme]
In order to reach above-mentioned technique effect, the present invention takes following technical scheme:
The invention provides a kind of method controlling Properties of Heavy Rail Steel By purity, the method flow process is: converter smelting → LF stove refining → RH vacuum-treat → continuous casting.The present invention adopts and use quickened lime in kiln process, the method of refining of quickened lime, silicon carbide and quartz sand slag making thereof is used in refining process, Properties of Heavy Rail Steel By continuously cast bloom sulphur content≤0.006% prepared, and in Properties of Heavy Rail Steel By the every grading of inclusion all≤2.0 grades.
Control a method for Properties of Heavy Rail Steel By 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; After converter smelting terminates, in molten steel tapping process, add calsibar alloy carry out deoxidation, add quickened lime simultaneously; After tapping terminates, to ladle top of the slag uniform fold one deck carbide of calcium; Then carry out ladle bottom blowing argon gas at least 5min, the flow control of described blowing argon gas is at 50 ~ 80NL/min;
The refining of B, LF stove
After the process of completing steps A, the molten steel in ladle is sent to LF stove and carries out refining; Argon bottom-blowing immediately after molten steel enters the station, the flow control of described blowing argon gas, at 150 ~ 200NL/min, when after argon bottom-blowing 2 ~ 3min, adds quickened lime successively, carbide of calcium, silicon carbide carries out refining in ladle; After refining 10min, the flow of adjustment blowing argon gas is 100 ~ 200NL/min, then adds carbide of calcium and continues refining; Again after refining 10min, adjustment blowing argon gas flow is 100 ~ 150NL/min, then adds quartz sand successively, silicon carbide continues refining, when molten steel temperature is heated to 1570 ~ 1600 DEG C, the flow of adjustment blowing argon gas is 50 ~ 80NL/min, argon bottom-blowing 6 ~ 10min under this flow, and molten steel sets off;
C, RH vacuum-treat
After the molten steel of step B process enters the station, vacuum-treat is carried out to molten steel; In vacuum treated whole process, control gas flow is 1200 ~ 1500NL/min, and vacuum tightness is less than 300Pa; When after vacuum-treat 15 ~ 18min, keep vacuum tightness, then add alloy and carry out Alloying Treatment; After alloying, more than circular treatment 5min, treats uniform composition, vacuum breaker; Then adjusting blowing argon gas flow is carry out more than argon bottom-blowing 5min under the condition of 50 ~ 80NL/min, and molten steel sets off;
D, continuous casting
Continuous casting rolling is carried out to the molten steel of step C process, production Properties of Heavy Rail Steel By.
The present invention is technical scheme further, and the add-on of described calsibar alloy is that molten steel per ton adds 2.5 ~ 3.5kg in step; The add-on of described quickened lime is that molten steel per ton adds 3 ~ 5kg; The add-on of described carbide of calcium is that molten steel per ton adds 0.2 ~ 0.4kg.
The present invention is technical scheme further, and in steps A and step B, described carbide of calcium is Ca
2the carbide of calcium that C mass content is greater than 98%.
The present invention is technical scheme further, and in stepb, the add-on of described quickened lime is that molten steel per ton adds 2 ~ 3kg; The first time add-on of described carbide of calcium is that molten steel per ton adds 0.2 ~ 0.4kg, second time add-on is that molten steel per ton adds 0.2 ~ 0.4kg; The first time add-on of described silicon carbide is that molten steel per ton adds 0.2 ~ 0.4kg, second time add-on is that molten steel per ton adds 0.2 ~ 0.4kg; The add-on of described quartz sand is that molten steel per ton adds 0.5 ~ 1kg.
The present invention will be explained below.
Control a method for Properties of Heavy Rail Steel By 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; After converter smelting terminates, in molten steel tapping process, add calsibar alloy carry out deoxidation, add quickened lime simultaneously; After tapping terminates, to ladle top of the slag uniform fold one deck carbide of calcium; Then carry out ladle bottom blowing argon gas at least 5min, the flow control of described blowing argon gas is at 50 ~ 80NL/min;
In step, use the molten iron of sulphur content≤0.02%, it is the sulphur content in order to control in molten steel, ensure that raw material sulphur content is from the beginning just lower, control raw material basicity like this is about 3 ~ 4, and further, desulfuration efficiency of the present invention is high and stable, and obvious improvement result can be played to each type impurity of molten steel, and be not only to category-A inclusion.In addition, in kiln process, use quickened lime to be that activity degree is high because quickened lime crystal grain is tiny, there is slagging speed fast, the metallurgy characteristics such as desulfuration, phosphorus are effective.This step uses compared with the molten iron of low sulfur content, and adds quickened lime again and carry out slagging desulfuration, and this is conducive to the process of the impurity elimination in later stage.The present invention adopts the deoxidation of existing calsibar alloy reductor, and it is a kind of al-free deoxidation technique, can control the inclusion in Properties of Heavy Rail Steel By further.
The refining of B, LF stove
After the process of completing steps A, the molten steel in ladle is sent to LF stove and carries out refining; Argon bottom-blowing immediately after molten steel enters the station, the flow control of described blowing argon gas, at 150 ~ 200NL/min, when after argon bottom-blowing 2 ~ 3min, adds quickened lime successively, carbide of calcium, silicon carbide carries out refining in ladle; After refining 10min, the flow of adjustment blowing argon gas is 100 ~ 200NL/min, then adds carbide of calcium and continues refining; Again after refining 10min, adjustment blowing argon gas flow is 100 ~ 150NL/min, then adds quartz sand successively, silicon carbide continues refining, when molten steel temperature is heated to 1570 ~ 1600 DEG C, the flow of adjustment blowing argon gas is 50 ~ 80NL/min, argon bottom-blowing 6 ~ 10min under this flow, and molten steel sets off;
In stepb, the present invention points out, the later stage must use silicon carbide, quartz sand etc. to reduce the slag charge of ladle slag basicity, basicity is controlled in the scope of 1.5 ~ 2.0, while control MnS inclusion, also controls the inclusion of other kinds.
The present invention carries out interpolation quickened lime, carbide of calcium, silicon carbide, quartz sand in batches, in order to impurity elimination layer by layer, but the kind of impurity elimination under the stage is different, and ensure that various types of inclusion is all controlled effectively, the effect of removal of inclusions like this is better.
C, RH vacuum-treat
After the molten steel of step B process enters the station, vacuum-treat is carried out to molten steel; In vacuum treated whole process, control gas flow is 1200 ~ 1500NL/min, and vacuum tightness is less than 300Pa; When after vacuum-treat 15 ~ 18min, keep vacuum tightness, then add alloy and carry out Alloying Treatment; After alloying, more than circular treatment 5min, treats uniform composition, vacuum breaker; Then adjusting blowing argon gas flow is carry out more than argon bottom-blowing 5min under the condition of 50 ~ 80NL/min, and molten steel sets off;
D, continuous casting
Continuous casting rolling is carried out to the molten steel of step C process, production Properties of Heavy Rail Steel By.
The present invention is technical scheme further, and the add-on of described calsibar alloy is that molten steel per ton adds 2.5 ~ 3.5kg in step; The add-on of described quickened lime is that molten steel per ton adds 3 ~ 5kg; The add-on of described carbide of calcium is that molten steel per ton adds 0.2 ~ 0.4kg.
The present invention is technical scheme further, and in steps A and step B, described carbide of calcium is Ca
2the carbide of calcium that C mass content is greater than 98%.Requirement for the purity of carbide of calcium is to better control inclusion.
The present invention is technical scheme further, and in stepb, the add-on of described quickened lime is that molten steel per ton adds 2 ~ 3kg; The first time add-on of described carbide of calcium is that molten steel per ton adds 0.2 ~ 0.4kg, second time add-on is that molten steel per ton adds 0.2 ~ 0.4kg; The first time add-on of described silicon carbide is that molten steel per ton adds 0.2 ~ 0.4kg, second time add-on is that molten steel per ton adds 0.2 ~ 0.4kg; The add-on of described quartz sand is that molten steel per ton adds 0.5 ~ 1kg.
By detecting the Properties of Heavy Rail Steel By adopting method provided by the invention to obtain, adopt rail sulphur content≤0.006% of this explained hereafter, the every grading of inclusion is all less than or equal to 2.0 grades, and T [O] all≤15 × 10
-6.
In the present invention, to the number of the add-on of quickened lime, carbide of calcium, silicon carbide, quartz sand, determine the number of the removal amount of inclusion, suitable add-on can remove more inclusion as much as possible, obtains the Properties of Heavy Rail Steel By compared with high cleanliness.
[beneficial effect]
The present invention compared with prior art, has following beneficial effect:
The present invention adopts relatively high basicity, and desulfuration efficiency is high and stable, and all serves obvious improvement result for each type impurity of molten steel.
Adopt the method for the invention molten steel S content can be reduced to≤0.006% and ensure the grading of steel inclusion all≤2.0 grades.And method of the present invention is applicable to production high-quality rail steel.
Embodiment
Below in conjunction with embodiments of the invention, the invention will be further elaborated.
Embodiment 1:
A, converter smelting
The molten iron entering converter is S content is 0.016%, after converter smelting terminates, start tapping, tapping process adds calsibar alloy and carries out deoxidation in ladle, add-on is that molten steel per ton adds 2.5kg Si-Ca-Ba, add steel grade other alloys required after Si-Ca-Ba has added immediately, meanwhile, in ladle, add quickened lime is that molten steel per ton adds 5kg.After tapping terminates, evenly adding carbide of calcium 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 adopts 60NLl/min.After tapping terminates, adopt the BOTTOM ARGON BLOWING flow Argon 6min of 50NL/min, then molten steel is sent to LF refining.
The refining of B, LF stove
Connect BOTTOM ARGON BLOWING after molten steel to LF station and carry out steel ladle bottom argon blowing, argon blowing rate adopts 150NL/min, after Argon 2min, in ladle, add that quickened lime molten steel per ton adds 2.0kg, carbide of calcium molten steel per ton adds 0.2kg, silicon carbide molten steel per ton adds 0.2kg successively, slag charge adds rear continuation heating refining; After refining 10min, ladle bottom blowing argon flow amount is adjusted to 150NL/min, in ladle, then adds carbide of calcium molten steel per ton add 0.4kg, after slag charge adds, proceed refining; Again after refining 10min, ladle bottom blowing argon flow amount is adjusted to 100NL/min, adds that quartz sand molten steel per ton adds 0.5kg, silicon carbide molten steel per ton adds 0.2kg in ladle, then continue to add heat refining, after refining 8min, molten steel temperature reaches 1575 DEG C.Now, ladle bottom blowing argon flow amount is adjusted to 80NL/min, sampling analysis now molten steel S content is 0.006%, and molten steel LF sets off and is sent to RH and carries out vacuum-treat.
C, RH vacuum-treat
After molten steel to RH vacuum station, setting RH tubular stinger lift gas flow is 1500NL/min, start to vacuumize, 3min final vacuum degree reaches 100Pa and is stabilized in this value and carries out vacuum-treat, when being 18min when treated, keep vacuum tightness, add carburelant 50kg, ferromanganese 100kg, after alloy adds, circular treatment 7min, make uniform composition, vacuum breaker.Then blowing argon gas 6min;
D, continuous casting
Molten steel is sent to continuous casting working procedure, is produced into 280 × 380mm bloom continuous casting base product, and continuously cast bloom product, by rolling technology, is produced into the rail steel of 60kg/m.
By detecting this rail adopting method provided by the invention to obtain, adopt sulphur content in the rail of this explained hereafter to be 0.006%, inclusion is every is rated category-A 2.0 grades, and category-B, C class, D class are 0.5 grade, T [O] average out to 12.4 × 10
-6.
Embodiment 2
A, converter smelting
The molten iron entering converter is S content is 0.020%, after converter smelting terminates, start tapping, tapping process adds calsibar alloy and carries out deoxidation in ladle, add-on is molten steel 3.5kg Si-Ca-Ba per ton, adds steel grade other alloys required after Si-Ca-Ba has added immediately.Meanwhile, in ladle, add quickened lime molten steel 5kg per ton.After tapping terminates, evenly add carbide of calcium molten steel 0.4kg per ton to the ladle top of the slag.In above-mentioned tapping process, ladle bottom blowing argon flow amount adopts 60NL/min.After tapping terminates, adopt the BOTTOM ARGON BLOWING flow Argon 6min of 50NL/min, then molten steel is sent to LF refining.
The refining of B, LF stove
Connect BOTTOM ARGON BLOWING after molten steel to LF station and carry out steel ladle bottom argon blowing, argon blowing rate adopts 150NL/min, after Argon 2min, add quickened lime molten steel per ton 3.0kg, carbide of calcium molten steel per ton 0.4kg, silicon carbide molten steel 0.4kg per ton successively in ladle, slag charge adds rear continuation heating refining; After refining 10min, ladle bottom blowing argon flow amount is adjusted to 150NL/min, in ladle, then adds carbide of calcium molten steel 0.2kg per ton, after slag charge adds, proceed refining; Again after refining 10min, ladle bottom blowing argon flow amount is adjusted to 100NL/min, in ladle, add quartz sand molten steel per ton 0.75kg, silicon carbide molten steel 0.4kg per ton, then continue to add heat refining, after refining 8min, molten steel temperature reaches 1580 DEG C.Now, ladle bottom blowing argon flow amount is adjusted to 80NL/min, sampling analysis now molten steel S content is 0.005%, and molten steel LF sets off and is sent to RH and carries out vacuum-treat.
C, RH vacuum-treat
After molten steel to RH vacuum station, setting RH tubular stinger lift gas flow is 1500NL/min, start to vacuumize, 3min final vacuum degree reaches 100Pa and is stabilized in this value and carries out vacuum-treat, when being 17min when treated, keep vacuum tightness, add carburelant 70kg, ferromanganese 120kg, after alloy adds, circular treatment 7min, make uniform composition, vacuum breaker.Then blowing argon gas 6min;
D, continuous casting
Molten steel is sent to continuous casting working procedure, is produced into 280 × 380mm bloom continuous casting base product, and continuously cast bloom product, by rolling technology, is produced into the rail steel of 60kg/m.
By detecting this rail adopting method provided by the invention to obtain, adopt sulphur content in the rail of this explained hereafter to be 0.005%, inclusion is every is rated category-A 1.5 grades, and category-B, C class, D class are 0.5 grade, T [O] average out to 10.6 × 10
-6.
Embodiment 3
A, converter smelting
The molten iron entering converter is S content is 0.010%, after converter smelting terminates, and start tapping, tapping process adds calsibar alloy and carries out deoxidation in ladle, and add-on is molten steel 3.0kg per ton, adds steel grade other alloys required after Si-Ca-Ba has added immediately.Meanwhile, in ladle, add quickened lime molten steel 3kg per ton.After tapping terminates, evenly add carbide of calcium molten steel 0.3kg per ton to the ladle top of the slag.In above-mentioned tapping process, ladle bottom blowing argon flow amount adopts 60NL/min.After tapping terminates, adopt the BOTTOM ARGON BLOWING flow Argon 6min of 50NL/min, then molten steel is sent to LF refining.
The refining of B, LF stove
Connect BOTTOM ARGON BLOWING after molten steel to LF station and carry out steel ladle bottom argon blowing, argon blowing rate adopts 150NL/min, after Argon 2min, add quickened lime molten steel per ton 3.0kg, carbide of calcium molten steel per ton 0.3kg successively, add silicon carbide molten steel 0.3kg per ton in ladle, slag charge adds rear continuation heating refining; After refining 10min, ladle bottom blowing argon flow amount is adjusted to 150NL/min, in ladle, then adds carbide of calcium molten steel 0.3kg per ton, after slag charge adds, proceed refining; Again after refining 10min, ladle bottom blowing argon flow amount is adjusted to 100NL/min, in ladle, add quartz sand molten steel per ton 1.0kg, silicon carbide molten steel 0.3kg per ton, then continue to add heat refining, after refining 8min, molten steel temperature reaches 1577 DEG C.Now, ladle bottom blowing argon flow amount is adjusted to 80NL/min, sampling analysis now molten steel S content is 0.005%, and molten steel LF sets off and is sent to RH and carries out vacuum-treat.
C, RH vacuum-treat
After molten steel to RH vacuum station, setting RH tubular stinger lift gas flow is 1500NL/min, start to vacuumize, 3min final vacuum degree reaches 100Pa and is stabilized in this value and carries out vacuum-treat, when being 18min when treated, keep vacuum tightness, add carburelant 30kg, ferromanganese 80kg, after alloy adds, circular treatment 8min, make uniform composition, vacuum breaker.Then blowing argon gas 6min;
D, continuous casting
Molten steel is sent to continuous casting working procedure, is produced into 280 × 380mm bloom continuous casting base product, and continuously cast bloom product, by rolling technology, is produced into the rail steel of 60kg/m.
By detecting this rail adopting method provided by the invention to obtain, adopt sulphur content in the rail of this explained hereafter to be 0.005%, inclusion is every is rated category-A 2.0 grades, and category-B, C class, D class are 0.5 grade, T [O] average out to 11.3 × 10
-6.
Although with reference to explanatory embodiment of the present invention, invention has been described here, above-described embodiment is only the present invention's preferably embodiment, embodiments of the present invention are not restricted to the described embodiments, should be appreciated that, those skilled in the art can design a lot of other amendment and embodiment, these amendments and embodiment will drop within spirit disclosed in the present application and spirit.
Claims (4)
1. control a method for Properties of Heavy Rail Steel By purity, it is characterized 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; After converter smelting terminates, in molten steel tapping process, add calsibar alloy carry out deoxidation, add quickened lime simultaneously; After tapping terminates, to ladle top of the slag uniform fold one deck carbide of calcium; Then carry out ladle bottom blowing argon gas at least 5min, the flow control of described blowing argon gas is at 50 ~ 80NL/min;
The refining of B, LF stove
After the process of completing steps A, the molten steel in ladle is sent to LF stove and carries out refining; Argon bottom-blowing immediately after molten steel enters the station, the flow control of described blowing argon gas, at 150 ~ 200NL/min, when after argon bottom-blowing 2 ~ 3min, adds quickened lime successively, carbide of calcium, silicon carbide carries out refining in ladle; After refining 10min, the flow of adjustment blowing argon gas is 100 ~ 200NL/min, then adds carbide of calcium and continues refining; Again after refining 10min, adjustment blowing argon gas flow is 100 ~ 150NL/min, then adds quartz sand successively, silicon carbide continues refining, when molten steel temperature is heated to 1570 ~ 1600 DEG C, the flow of adjustment blowing argon gas is 50 ~ 80NL/min, argon bottom-blowing 6 ~ 10min under this flow, and molten steel sets off;
C, RH vacuum-treat
After the molten steel of step B process enters the station, vacuum-treat is carried out to molten steel; In vacuum treated whole process, control gas flow is 1200 ~ 1500NL/min, and vacuum tightness is less than 300Pa; When after vacuum-treat 15 ~ 18min, keep vacuum tightness, then add alloy and carry out Alloying Treatment; After alloying, more than circular treatment 5min, treats uniform composition, vacuum breaker; Then adjusting blowing argon gas flow is carry out more than argon bottom-blowing 5min under the condition of 50 ~ 80NL/min, and molten steel sets off;
D, continuous casting
Continuous casting rolling is carried out to the molten steel of step C process, production Properties of Heavy Rail Steel By.
2. the method for control Properties of Heavy Rail Steel By purity according to claim 1, is characterized in that the add-on of described calsibar alloy is in step that molten steel per ton adds 2.5 ~ 3.5kg; The add-on of described quickened lime is that molten steel per ton adds 3 ~ 5kg; The add-on of described carbide of calcium is that molten steel per ton adds 0.2 ~ 0.4kg.
3. the method for control Properties of Heavy Rail Steel By purity according to claim 1, is characterized in that, in steps A and step B, described carbide of calcium is Ca
2the carbide of calcium that C mass content is greater than 98%.
4. the method for control Properties of Heavy Rail Steel By purity according to claim 1, is characterized in that in stepb, and the add-on of described quickened lime is that molten steel per ton adds 2 ~ 3kg; The first time add-on of described carbide of calcium is that molten steel per ton adds 0.2 ~ 0.4kg, second time add-on is that molten steel per ton adds 0.2 ~ 0.4kg; The first time add-on of described silicon carbide is that molten steel per ton adds 0.2 ~ 0.4kg, second time add-on is that molten steel per ton adds 0.2 ~ 0.4kg; The add-on of described quartz sand is that molten steel per ton adds 0.5 ~ 1kg.
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| CN109022661A (en) * | 2017-06-12 | 2018-12-18 | 鞍钢股份有限公司 | A method of it reducing Properties of Heavy Rail Steel and hurts rail rate |
| 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 |
| 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 |
| 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 |
| 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 |
| CN108950119A (en) * | 2018-07-26 | 2018-12-07 | 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 |
| 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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