CN109593913A - A kind of rare earth adding method and RE Steel for Heavy Rail of RE Steel for Heavy Rail - Google Patents
A kind of rare earth adding method and RE Steel for Heavy Rail of RE Steel for Heavy Rail Download PDFInfo
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- CN109593913A CN109593913A CN201811368039.3A CN201811368039A CN109593913A CN 109593913 A CN109593913 A CN 109593913A CN 201811368039 A CN201811368039 A CN 201811368039A CN 109593913 A CN109593913 A CN 109593913A
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- rare earth
- steel
- heavy rail
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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
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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
- C21C7/10—Handling in a vacuum
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
Abstract
The present invention provides the rare earth adding method and RE Steel for Heavy Rail of a kind of RE Steel for Heavy Rail, and the above method successively carries out LF refining when producing RE Steel for Heavy Rail, by the RE Steel for Heavy Rail and VD is refined to molten steel O2Under the premise of %≤10ppm, content of rare earth >=99wt% rare earth alloy is added in molten steel using the method that direct plunges into.Pass through above-mentioned Adding Way, on the one hand, guarantee that content of rare earth 99% or more, can greatly reduce the oxygen content in rare earth alloy, but also rare earth can be promoted quickly to melt in molten steel using pure rare earth, long agitation homogenization is avoided to lead to oxygenation；On the other hand, after LF+VD refining, the oxygen content in Properties of Heavy Rail Steel molten steel is reduced within 10ppm, oxidation of the dissolved oxygen in molten steel to rare earth is avoided, rare earth recovery rate thus can be improved.
Description
Technical field
The invention belongs to RE Steel for Heavy Rail preparation technical fields, and in particular to a kind of rare earth adding method of RE Steel for Heavy Rail
And RE Steel for Heavy Rail.
Background technique
The Adding Way of rare earth alloy is the alloyage process that generates along with rare earth in steel application technology, is scene
The purpose of basic methods of the most critical of realization rare earth in steel application technology in production practices, core is to improve rare earth to receive
Rate is avoided rare earth alloy from being added and aoxidizing in fusion process, promotes rare earth to be dissolved into steel with simple substance form, promote rare earth oxygen
Compound being uniformly distributed in steel realizes rare earth to the performance improvement of Properties of Heavy Rail Steel.
Existing rare earth adding method has: (1) in the form of rare earth bundle component wire, being added using silk method is fed in ladle.It should
The shortcomings that method is to need Argon to stir during feeding silk, causes slag-metal reaction violent, rare earth recovery rate is very low, generates simultaneously
Volume of smoke pollute environment；(2) it is added in crystallizer in a manner of rare-earth wires, this method is it is possible to prevente effectively from rare earth is adding
Entering leads to rare earth in steel point but by pouring temperature, the fluctuation of pulling rate and crystallizer flow field with the oxidation in fusion process
Cloth is uneven, exacerbates the anisotropic of stocking；(3) it is added in LF furnace in the form of rare earth ferroalloy, the disadvantage is that: rare earth is rear
It is a large amount of to aoxidize and entered in slag in the form of rare earth oxide, it is difficult to realize the application of rare earth in steel in the treatment process of phase.
In consideration of it, rare earth is greatly improved and receives it is an object of the invention to avoid above-mentioned shortcoming in the prior art
Rate converts actual production application by laboratory research for the application technology of rare earth in steel, realizes RE Elements on Steel matter performance
Improvement, realize mass and the industrialized development of rare earth steel.
Summary of the invention
The present invention provides the rare earth adding method and RE Steel for Heavy Rail of a kind of RE Steel for Heavy Rail, above-mentioned RE Steel for Heavy Rail it is dilute
The technical standard that native Adding Way is added by clear rare earth optimizes the Adding Way of VD refining furnace rare earth alloy, improves rare earth
Recovery rate realizes that the Metamorphism treatment of field trash in RE Elements on Steel, cleaning molten steel improve Rare-earth Rail performance.
The present invention solves the technical solution that above-mentioned technical problem uses are as follows:
First aspect present invention provides a kind of rare earth adding method of RE Steel for Heavy Rail, will when producing RE Steel for Heavy Rail
Properties of Heavy Rail Steel successively carries out LF refining and VD is refined to oxygen content≤10ppm in molten steel, using direct plungeing into method for content of rare earth
The rare earth alloy of >=99wt% is added in molten steel.
Preferably, in the rare earth adding method of above-mentioned RE Steel for Heavy Rail, the specific investing method for direct plungeing into method are as follows:
(1) high-quality iron sheet sealed envelope is used before rare earth alloy is added, and strictly avoids iron sheet from getting rusty, is moist；
(2) before being added, ladle argon system is closed, keeps steel liquid level stabilizing；It has been hung using crane and has prepared the dilute of addition
Native alloy is opened ladle argon system, is gradually blown the clinker of molten steel surface for diameter open by the way of gradually ascending
For the region of 300~Φ of Φ 400mm；It commands crane to be directed at above-mentioned zone, rare earth alloy is quickly put into molten steel, rare earth is avoided
Alloy is contacted with clinker；
(3) after rare earth alloy is added, it is reduced rapidly argon flow, reaches soft blow effect, and keep 10min or more, guaranteed
Rare earth alloy is full and uniform to be dissolved into molten steel.
Preferably, in the rare earth adding method of above-mentioned RE Steel for Heavy Rail, the Properties of Heavy Rail Steel is U75V, U76CrRe or Baogang
Third generation rare earth rail BGRE III.
Preferably, in the rare earth adding method of above-mentioned RE Steel for Heavy Rail, the rare earth alloy is rare earth ferroalloy, rare earth aluminium
Alloy or rare-earth copper alloy.
Second aspect of the present invention provides a kind of rare earth weight that the rare earth adding method by above-mentioned RE Steel for Heavy Rail is prepared
Rail steel.
Preferably, dilute in the RE Steel for Heavy Rail that the rare earth adding method of RE Steel for Heavy Rail of the present invention is prepared
Native simple substance content is in 40wt% or more.
Above-mentioned technical proposal of the invention has the advantages that
(1) rare earth adding method of RE Steel for Heavy Rail of the present invention, when producing RE Steel for Heavy Rail, by the rare earth weight
Rail steel successively carries out LF refining and VD is refined to molten steel O2Under the premise of %≤10ppm, using direct plungeing into method for content of rare earth
The rare earth alloy of >=99wt% is added in molten steel.Pass through above-mentioned Adding Way, on the one hand, guarantee that content of rare earth exists using pure rare earth
99% or more, the oxygen content in rare earth alloy can be greatly reduced, but also rare earth can be promoted quickly to melt in molten steel, avoided
Long agitation homogenization leads to oxygenation；On the other hand, after LF+VD refining, the oxygen content in Properties of Heavy Rail Steel molten steel is reduced to
Within 10ppm, oxidation of the dissolved oxygen in molten steel to rare earth is avoided, rare earth recovery rate thus can be improved.
(2) rare earth adding method of RE Steel for Heavy Rail of the present invention, using the adding manner direct plungeed into: rare earth alloy
High-quality iron sheet sealed envelope is used before being added, and strictly avoids iron sheet from getting rusty, is moist；Before addition, ladle argon system is closed, is kept
Steel liquid level stabilizing；The rare earth alloy for preparing to be added has been hung using crane, by the way of gradually ascending, opens ladle argon
The clinker of molten steel surface is gradually blown open the region for being 300~Φ of Φ 400mm for diameter by gas system；Command crane alignment above-mentioned
Rare earth alloy is quickly put into molten steel, rare earth alloy is avoided to contact with clinker by region；After rare earth alloy is added, it is reduced rapidly
Argon flow reaches soft blow effect, and keeps 10min or more, guarantees that rare earth alloy is full and uniform and is dissolved into molten steel, thus may be used
Promote being uniformly distributed for rare earth in steel, realizes rare earth to the performance improvement of Properties of Heavy Rail Steel.
Specific embodiment
Technical solution of the present invention will be clearly and completely described below, it is clear that described embodiment is this hair
Bright a part of the embodiment, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not having
Every other embodiment obtained under the premise of creative work is made, shall fall within the protection scope of the present invention.In addition, below
Technical characteristic involved in described different embodiments of the present invention as long as they do not conflict with each other can be mutual
In conjunction with.
Embodiment 1
The rare earth adding method of RE Steel for Heavy Rail provided in this embodiment includes the following steps:
U75V Properties of Heavy Rail Steel is successively carried out to LF refining and VD is refined to oxygen content≤10ppm in molten steel, using directly throwing
Enter method the rare earth ferroalloy that content of rare earth is 99wt% is added into molten steel；
The above-mentioned specific investing method for direct plungeing into method are as follows:
(1) high-quality iron sheet sealed envelope is used before rare earth ferroalloy is added, and strictly avoids iron sheet from getting rusty, is moist；
(2) before being added, ladle argon system is closed, keeps steel liquid level stabilizing；It has been hung using crane and has prepared the dilute of addition
Unmanufactured iron alloy opens ladle argon system, it is straight for gradually blowing the clinker of molten steel surface open by the way of gradually ascending
Diameter is the region of 300~Φ of Φ 350mm；It commands crane to be directed at above-mentioned zone, rare earth ferroalloy is quickly put into molten steel, is avoided
Rare earth ferroalloy is contacted with clinker；
(3) after rare earth ferroalloy is added, it is reduced rapidly argon flow, reaches soft blow effect, and keep 10min, guaranteed dilute
Unmanufactured iron alloy is full and uniform to be dissolved into molten steel.
In the present embodiment, the rare earth in rare earth ferroalloy is the mixture of lanthanum, cerium, praseodymium, neodymium, promethium, samarium and europium.
Embodiment 2
The rare earth adding method of RE Steel for Heavy Rail provided in this embodiment includes the following steps:
U76CrRe Properties of Heavy Rail Steel is successively carried out to LF refining and VD is refined to oxygen content≤10ppm in molten steel, using direct
The rare earth aluminium alloy that content of rare earth is 99.2wt% is added into molten steel throw-in play；
The above-mentioned specific investing method for direct plungeing into method are as follows:
(1) high-quality iron sheet sealed envelope is used before rare earth aluminium alloy is added, and strictly avoids iron sheet from getting rusty, is moist；
(2) before being added, ladle argon system is closed, keeps steel liquid level stabilizing；It has been hung using crane and has prepared the dilute of addition
Native aluminium alloy opens ladle argon system, it is straight for gradually blowing the clinker of molten steel surface open by the way of gradually ascending
Diameter is the region of 300~Φ of Φ 350mm；It commands crane to be directed at above-mentioned zone, rare earth aluminium alloy is quickly put into molten steel, is avoided
Rare earth aluminium alloy is contacted with clinker；
(3) after rare earth aluminium alloy is added, it is reduced rapidly argon flow, reaches soft blow effect, and keep 12min, guaranteed dilute
Native aluminium alloy is full and uniform to be dissolved into molten steel.
In the present embodiment, the rare earth in rare earth ferroalloy is the mixture of lanthanum, cerium, neodymium, samarium and europium.
Embodiment 3
The rare earth adding method of RE Steel for Heavy Rail provided in this embodiment includes the following steps:
III Properties of Heavy Rail Steel of Baogang third generation rare earth rail BGRE is successively subjected to LF refining and VD is refined to oxygen content in molten steel
≤ 10ppm uses the method for direct plungeing into that content of rare earth is added for the rare-earth copper alloy of 99.3wt% into molten steel；
The above-mentioned specific investing method for direct plungeing into method are as follows:
(1) high-quality iron sheet sealed envelope is used before rare-earth copper alloy is added, and strictly avoids iron sheet from getting rusty, is moist；
(2) before being added, ladle argon system is closed, keeps steel liquid level stabilizing；It has been hung using crane and has prepared the dilute of addition
Native copper alloy opens ladle argon system, it is straight for gradually blowing the clinker of molten steel surface open by the way of gradually ascending
Diameter is the region of 300~Φ of Φ 350mm；It commands crane to be directed at above-mentioned zone, rare-earth copper alloy is quickly put into molten steel, is avoided
Rare-earth copper alloy is contacted with clinker；
(3) after rare-earth copper alloy is added, it is reduced rapidly argon flow, reaches soft blow effect, and keep 12min, guaranteed dilute
Native copper alloy is full and uniform to be dissolved into molten steel.
In the present embodiment, the rare earth in rare-earth copper alloy is the mixture of lanthanum, cerium, neodymium, samarium and europium.
Embodiment 4
The rare earth adding method of RE Steel for Heavy Rail provided in this embodiment includes the following steps:
III Properties of Heavy Rail Steel of Baogang third generation rare earth rail BGRE is successively subjected to LF refining and VD is refined to oxygen content in molten steel
≤ 10ppm uses the method for direct plungeing into that content of rare earth is added for the rare-earth copper alloy of 99wt% into molten steel；
The above-mentioned specific investing method for direct plungeing into method are as follows:
(1) high-quality iron sheet sealed envelope is used before rare-earth copper alloy is added, and strictly avoids iron sheet from getting rusty, is moist；
(2) before being added, ladle argon system is closed, keeps steel liquid level stabilizing；It has been hung using crane and has prepared the dilute of addition
Native copper alloy opens ladle argon system, it is straight for gradually blowing the clinker of molten steel surface open by the way of gradually ascending
Diameter is the region of 300~Φ of Φ 400mm；It commands crane to be directed at above-mentioned zone, rare-earth copper alloy is quickly put into molten steel, is avoided
Rare-earth copper alloy is contacted with clinker；
(3) after rare-earth copper alloy is added, it is reduced rapidly argon flow, reaches soft blow effect, and keep 15min, guaranteed dilute
Native copper alloy is full and uniform to be dissolved into molten steel.
In the present embodiment, the rare earth in rare-earth copper alloy is the mixture of lanthanum, cerium, neodymium, samarium, europium, thulium, ytterbium and lutetium.
Experimental example
Rare earth simple substance content in the RE Steel for Heavy Rail prepared in the measurement embodiment of the present invention 1~4, result such as following table institute
Show.
1 rare earth simple substance content (wt%) of table
| Rare earth simple substance content (wt%) | |
| Embodiment 1 | 40 |
| Embodiment 2 | 41 |
| Embodiment 3 | 40 |
| Embodiment 4 | 43 |
To sum up, the technical standard that the rare earth adding method of RE Steel for Heavy Rail provided by the invention is added by clear rare earth,
Optimize the Adding Way of VD refining furnace rare earth alloy, improve rare earth recovery rate, realizes the Metamorphism treatment of field trash in RE Elements on Steel,
Cleaning molten steel improves Rare-earth Rail performance.
Obviously, the above embodiments are merely examples for clarifying the description, and does not limit the embodiments.It is right
For those of ordinary skill in the art, can also make on the basis of the above description it is other it is various forms of variation or
It changes.There is no necessity and possibility to exhaust all the enbodiments.And it is extended from this it is obvious variation or
It changes still within the protection scope of the invention.
Claims (6)
1. a kind of rare earth adding method of RE Steel for Heavy Rail, which is characterized in that when producing RE Steel for Heavy Rail, successively by Properties of Heavy Rail Steel
It carries out LF refining and VD and is refined to oxygen content≤10ppm in molten steel, using the method that direct plunges by content of rare earth >=99wt%
Rare earth alloy is added in molten steel.
2. the rare earth adding method of RE Steel for Heavy Rail according to claim 1, which is characterized in that the method that direct plunges into
Specific investing method are as follows:
(1) high-quality iron sheet sealed envelope is used before rare earth alloy is added, and strictly avoids iron sheet from getting rusty, is moist；
(2) before being added, ladle argon system is closed, keeps steel liquid level stabilizing；The rare earth for preparing to be added has been hung using crane to close
Gold opens ladle argon system, gradually blowing the clinker of molten steel surface for diameter open is Φ by the way of gradually ascending
The region of 300~Φ 400mm；It commands crane to be directed at above-mentioned zone, rare earth alloy is quickly put into molten steel, rare earth alloy is avoided
It is contacted with clinker；
(3) after rare earth alloy is added, it is reduced rapidly argon flow, reaches soft blow effect, and keep 10min or more, guarantee rare earth
Alloy is full and uniform to be dissolved into molten steel.
3. the rare earth adding method of RE Steel for Heavy Rail according to claim 1 or 2, which is characterized in that the Properties of Heavy Rail Steel is
U75V, U76CrRe or Baogang third generation rare earth rail BGRE III.
4. the rare earth adding method of described in any item RE Steel for Heavy Rail according to claim 1~3, which is characterized in that described dilute
Native alloy is rare earth ferroalloy, rare earth aluminium alloy or rare-earth copper alloy.
5. a kind of rare earth weight that the rare earth adding method by the described in any item RE Steel for Heavy Rail of Claims 1 to 4 is prepared
Rail steel.
6. in the RE Steel for Heavy Rail that the rare earth adding method of the described in any item RE Steel for Heavy Rail of Claims 1 to 4 is prepared
Rare earth simple substance content in 40wt% or more.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811368039.3A CN109593913A (en) | 2018-11-16 | 2018-11-16 | A kind of rare earth adding method and RE Steel for Heavy Rail of RE Steel for Heavy Rail |
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| CN201811368039.3A CN109593913A (en) | 2018-11-16 | 2018-11-16 | A kind of rare earth adding method and RE Steel for Heavy Rail of RE Steel for Heavy Rail |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110438389A (en) * | 2019-09-16 | 2019-11-12 | 内蒙古工业大学 | A kind of high-purity rare earth steel production method |
| CN110629103A (en) * | 2019-10-22 | 2019-12-31 | 山东钢铁集团有限公司 | Production method and device for vacuum degassing rare earth steel |
| CN111560493A (en) * | 2020-05-12 | 2020-08-21 | 包头钢铁（集团）有限责任公司 | Control method for modified heavy rail steel composite inclusions |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1071644A1 (en) * | 1982-08-11 | 1984-02-07 | Уральский научно-исследовательский институт черных металлов | Method for making steel |
| CN103205532A (en) * | 2013-04-11 | 2013-07-17 | 内蒙古包钢钢联股份有限公司 | Method for adding rare earth to steel |
| CN105154623A (en) * | 2015-07-30 | 2015-12-16 | 达力普石油专用管有限公司 | Efficient alloying method for smelting 38CrMoAl steel |
| CN106521293A (en) * | 2016-08-04 | 2017-03-22 | 中国科学院金属研究所 | Method for adding rare earth metal into steel to improve performance |
-
2018
- 2018-11-16 CN CN201811368039.3A patent/CN109593913A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1071644A1 (en) * | 1982-08-11 | 1984-02-07 | Уральский научно-исследовательский институт черных металлов | Method for making steel |
| CN103205532A (en) * | 2013-04-11 | 2013-07-17 | 内蒙古包钢钢联股份有限公司 | Method for adding rare earth to steel |
| CN105154623A (en) * | 2015-07-30 | 2015-12-16 | 达力普石油专用管有限公司 | Efficient alloying method for smelting 38CrMoAl steel |
| CN106521293A (en) * | 2016-08-04 | 2017-03-22 | 中国科学院金属研究所 | Method for adding rare earth metal into steel to improve performance |
Non-Patent Citations (2)
| Title |
|---|
| 俞海明: "《电炉钢水的炉外精炼技术》", 31 August 2010, 冶金工业出版社 * |
| 智建国 等: "添加稀土处理钢的炼钢生产工艺研究", 《第十一届中国钢铁年会论文——S02.炼钢与连铸》 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110438389A (en) * | 2019-09-16 | 2019-11-12 | 内蒙古工业大学 | A kind of high-purity rare earth steel production method |
| CN110438389B (en) * | 2019-09-16 | 2021-03-16 | 内蒙古工业大学 | Production method of high-purity rare earth steel |
| CN110629103A (en) * | 2019-10-22 | 2019-12-31 | 山东钢铁集团有限公司 | Production method and device for vacuum degassing rare earth steel |
| CN110629103B (en) * | 2019-10-22 | 2023-12-05 | 山东钢铁集团有限公司 | Production method of vacuum degassing rare earth steel and device used by same |
| CN111560493A (en) * | 2020-05-12 | 2020-08-21 | 包头钢铁（集团）有限责任公司 | Control method for modified heavy rail steel composite inclusions |
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Application publication date: 20190409 |