CN102373360A - Fe-La intermediate alloy for rare earth addition into steel and manufacture method thereof - Google Patents
Fe-La intermediate alloy for rare earth addition into steel and manufacture method thereof Download PDFInfo
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- CN102373360A CN102373360A CN2011103513585A CN201110351358A CN102373360A CN 102373360 A CN102373360 A CN 102373360A CN 2011103513585 A CN2011103513585 A CN 2011103513585A CN 201110351358 A CN201110351358 A CN 201110351358A CN 102373360 A CN102373360 A CN 102373360A
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Abstract
The invention relates to a Fe-La intermediate alloy for rare earth addition into steel and a manufacture method thereof. The alloy is prepared from the following ingredients in percentage by weight through processing: 70 weight percent to 95 weight percent of pure iron and 5 weight percent to 30 weight percent of metallic La. The manufacture method comprises the following steps that: the vacuum smelting is carried out in a vacuum middle-frequency induction furnace crucible, the vacuum degree is lower than or equal to 0.1P, silicon, barium and calcium are used for sufficient deoxygenation, the metallic La is added into pure molten iron in the crucible when the temperature reaches 1550 DEG C to 1650 DEG C, and the smelting and mixing time is 1 to 10minutes. The Fe-La intermediate alloy has the advantages that when the Fe-La intermediate alloy is used in steel ladles, the rare earth adding effect is good, the rare earth addition form is novel and efficient, the operation is simple and convenient, the equipment and operators are not added, the yield of the rare earth is greatly improved, the distribution of the rare earth in molten steel is uniform, the addition of the rare earth is greatly reduced, the rare earth addition operation environment is effectively improved, the steel-making production efficiency is improved, the quality of the rare earth steel product is improved, and the integral cost is reduced.
Description
One, technical field:
The present invention relates to a kind of steel middle-weight rare earths and add, belong to the ferrous metallurgy field with Fe-La master alloy and method of manufacture thereof.
Two, background technology:
China is the rare earth big country of world's rare earth resources and rare earth output first, is again rare earth consumption big country, also is the big steel country of output of steel first, but the rolling shapes quality also has sizable gap with external advanced level, still has a considerable amount of steel to need import.Rare earth has cleaning molten steel in steel; Make inclusion modification and microalloying effect; The transverse impact toughness of heavy rail, steel plate, weldless steel tube, bar is significantly improved, and antioxidant and corrosive nature obviously improve, and can also improve plasticity and anti-lamellar tearing performance.Domestic and international many steel mills facts have proved for many years, add rare earth in the steel, are one of effective measure that improve steel, development new variety.
Since nineteen fifties, carried out the research work that a large amount of relevant rare earths act on both at home and abroad in steel, obtain very important achievement, monograph, patent of invention;
After twentieth century 70, the eighties, rare earth steel gets into China Steel product list as matured product, and the sheet material kind in the rare earth steel accounts for the overwhelming majority;
The effect of RE in steel reduces purification, rotten and microalloying three acts on greatly; Rare earth is to the Water purification of steel, but the degree of depth reduces the content of oxygen and sulphur; Rare earth can change inclusion (MnS, Al to the metamorphism of steel inclusion
2O
3) character, form and distribution, calcium handles to be generally acknowledged being the comparatively economically viable technical measures that obtain low impurity steel; Rare earth is to the microalloying effect of steel; Give full play to the mutual supplement with each other's advantages effect of rare earth and micro alloying element (niobium, vanadium, titanium, boron), alloying element (nickel, chromium, molybdenum, copper); Reduce the damaging effect (fragility) of low melting point metal (antimony, tin, lead, zinc, arsenic, bismuth, copper etc.) in steel; The performance trace rare-earth element suppresses the local attenuation by force, comprehensively improves the performance of steel, improves the steel product differentiation.
Get into nineteen nineties, the alloying action of RE in steel obtains broad research, and using in steel for rare earth provides broad space more.
The late 20th century, initial stage 21st century, STEELMAKING PRODUCTION gets into continuous casting full-time generation, and rare earth steel production is but day by day quiet--and-rare earth steel output descends significantly.
The rare earth adding technology that continuous casting is produced rare earth steel mainly contains three kinds: Feeding Rare Earth Wire in Continuous Casting Mould (coating iron sheet) technology, tundish feeding rare-earth wires (coating iron sheet) technology, ladle are fed rare earth (RESiCa, RECa) composite core-spun yarn technology.
The steel middle-weight rare earths adds the comparison of technology
Rare earth adding technology is different, and the recovery of rare earth is also different.And the recovery of rare earth is high, means that rare earth is residual many in steel, and rare-earth residual amount is that the performance to rare earth steel plays a crucial factor.
Ladle is fed rare earth (RESiCa, RECa) composite core-spun yarn technology:
Ladle is fed rare earth (RESiCa, RECa) composite core-spun yarn technology, is with in rare earth bundle component wire (silicon calcium powder and rare-earth wires being coated with iron sheet) the feeding ladle of wire feeder with
.Steel grade without VD technology is employed in refining later stage hello rare earth (RESiCa, RECa) composite core-spun yarn, after the steel grade of VD (RH) technology is employed in VD (RH), feeds rare earth (RESiCa, RECa) composite core-spun yarn.
Technological advantage:
Simple to operation, rare earth is evenly distributed in molten steel.
The technology shortcoming:
Increase equipment and operator, the yield of rare earth is lower, and nozzle clogging and rare earth adding quantity problem on the low side is arranged.
Feeding Rare Earth Wire in Continuous Casting Mould (coating iron sheet) technology:
Feeding Rare Earth Wire in Continuous Casting Mould (coating iron sheet) technology is with in rare-earth wires (coating iron sheet) the feeding mold with wire feeder.To multithread bloom, little square billet, round billet continuous casting, need many wire feeders, first-class to one; To sheet billet continuous casting, need first-class to two.Need adorn many wire feeders, wire feeder is placed and is received on-the-spot restriction, also influences workman's operation.
Technological advantage:
The yield of rare earth is higher, and rare earth adding quantity can be higher, and nozzle clogging does not take place.
The technology shortcoming:
The Feeding Rare Earth Wire in Continuous Casting Mould rare-earth residual amount for a long time, most resultant of reaction remain in the steel, pollute the tendency of steel easily; RE distributes relatively also inhomogeneous on the steel billet transverse section; During the multithread continuous casting, the complicated operation of feeding rare-earth wires, inconvenience; Need adorn many wire feeders, wire feeder is placed and is received on-the-spot restriction, also influences workman's operation; Increase equipment and operator.
Tundish feeding rare-earth wires (coating iron sheet) technology
Tundish feeding rare-earth wires (coating iron sheet) technology is with rare-earth wires (coating iron sheet) feeding tundish T type mouth with wire feeder.Because the tundish feeding rare-earth wires is to add than the later stage in continuous casting production, molten steel flows to mold from tundish T type mouth has certain hour, and rare earth has than adequate time in molten steel and spreads, and rare earth is evenly distributed in steel.In addition, also created condition, played the cleaning molten steel effect for the re inclusion come-up.
Technological advantage:
Simple to operation, the yield of rare earth is higher, and rare earth is evenly distributed in molten steel.
The technology shortcoming:
Increase equipment and operator have nozzle clogging and rare earth adding quantity problem on the low side.
Rare earth steel---this has combined the iron and steel kind of china natural resources advantage, and what course to follow? The application of rare earth in steel product has been a familiar topic, but sees from the angle of rare earth resources comprehensive utilization and steel product differentiation, more should be a new topic.
In today that the smelting control techniques and the steel cleanliness factor of steel improves constantly, the effect of REE in steel is can be more effective controlled and better obtain performance; In the today that faces the dog-eat-dog competition of steel product market, REE can more effectively obtain comprehensive utilization in steel; Improve the differentiation of steel product, the market competitiveness of enhancing steel product with this strategic element of rare earth; Be converted into the species the advantage and the economic advantages of steel product to the resources advantage of rare earth, make rare earth its unique effect of performance in the differentiation that improves steel product.
Three, summary of the invention:
The objective of the invention is to add technological problems to the invar middle-weight rare earths causes the rare earth can not widespread use in steel; For overcoming defective and the deficiency that existing steel middle-weight rare earths adds technology and rare earth material form thereof, provide a kind of steel-making continuous casting to produce the steel middle-weight rare earths and add with Fe-La master alloy and method of manufacture thereof.
Fe-La master alloy of the present invention is to be processed into by the starting material process of following weight percent: pure iron 70wt%～95wt%, metal La 5wt%～30wt%.
The chemical ingredients of product of the present invention and weight percentage:
Chemical ingredients: Fe, metal La
Said raw-material technical parameter:
Pure iron, among Fe >=98wt%, the metal La, La >=95wt%.
(wt%): C≤0.03 in the chemical ingredients of pure iron, Si≤0.25, Mn≤0.25, P≤0.01, S≤0.007, Fe>=98.
Continuous casting of the present invention is produced the adding of steel middle-weight rare earths and is processed according to following method with Fe-RE (mixing) master alloy:
Weight percent as requested is equipped with the weighing pure iron; Put into the vacuum medium frequency induction furnace crucible, carry out vacuum melting, vacuum tightness≤0.1Pa; With the abundant deoxidation of silicon barium calcium; When treating that temperature reaches 1550 ℃～1650 ℃, the pure iron molten steel adds the metal La of weight percent outfit weighing as requested in crucible, and fusing, the time of mixing behind the adding metal La are 1～10 minute; Then the uniform Fe-La master alloy of melt-blended molten steel is poured into combination and it is cooled off fully in the ingot mold, the demoulding promptly becomes the Fe-La master alloy of Granular forms after the die sinking.
The granularity of Fe-La master alloy is 5mm～30mm, utilizes double-deck overlay film packing (plastics bag) to become 5 kilograms～25 kilograms/bag Fe-La master alloy product.
Product of the present invention is held three keys in the preparation process:
(1) starting material must be preferred, and raw-material content's index must meet the demands;
(2) starting material must mix under high-temperature liquid state, and are even with each chemical ingredients that guarantees Fe-La master alloy product particle.
(3) granularity of Fe-La master alloy product particle is 5mm～30mm.
Fe-La master alloy of the present invention is used for the steel middle-weight rare earths and adds, and rare earth adds effective, and rare earth adds novel form, efficient; Simple to operation, do not increase equipment and operator, the yield of rare earth increases substantially; Rare earth is evenly distributed in molten steel, and the add-on of rare earth reduces significantly, and rare earth adds operating environment effectively to be improved; STEELMAKING PRODUCTION efficient improves, and the quality of rare earth steel steel product improves, comprehensive cost reduces.
Continuous casting of the present invention is produced the adding of steel middle-weight rare earths and is used the Fe-La master alloy, is applied to the adding of steel middle-weight rare earths and has following obvious advantage and effect:
(1) in steel, add rare earth with Fe-La master alloy form, do not increase equipment and operator, simple to operation, the shortening of rare earth adding technology running time, efficient improve, and have solved a difficult problem that adds rare earth in the steel, and rare earth adds novel form, efficient;
(2) in steel, add rare earth with Fe-La master alloy form, because of adding the simple to operation of master alloy form, the running cost that the steel middle-weight rare earths adds reduces;
(3) in steel, add rare earth with Fe-La master alloy form, because Fe-La master alloy product is a Granular forms, fusing point is higher, and the scaling loss of rare earth reduces significantly, and the yield of rare earth increases substantially, and the material cost that the steel middle-weight rare earths adds reduces;
(4) in steel, add rare earth with Fe-La master alloy form, because the yield of rare earth increases substantially, the add-on of rare earth reduces significantly, and the size of steel middle-weight rare earths inclusion reduces, quantity reduces, and the quality of steel product improves;
(5) in steel, add rare earth with Fe-La master alloy form, no molten steel splash, no flue dust produce, and the adding operational safety of rare earth is reliable, and operating environment is effectively improved;
(6) in steel, add rare earth with Fe-La master alloy form, because Fe-La master alloy product is a Granular forms, fusing point is higher, and proportion is higher, rare earth being evenly distributed in molten steel;
(7) in steel, add rare earth with Fe-La master alloy form, because of the shortening of rare earth adding technology running time, efficient improve, STEELMAKING PRODUCTION efficient improves;
(8) in steel, add rare earth with Fe-La master alloy form; Because of the rare earth adding technology running time shortens; The scaling loss of rare earth reduces significantly, and the yield of rare earth increases substantially, and the add-on of rare earth reduces significantly; The quality of steel product improves, and the comprehensive cost of rare earth steel steel product reduces.
Four, embodiment:
Fe-La master alloy of the present invention is to be processed into by the starting material process of following weight percent: pure iron 70wt%～95wt%, metal La5wt%～30wt%.
Continuous casting of the present invention is produced the adding of steel middle-weight rare earths and is processed according to following method with the Fe-La master alloy:
At first according to 100 kilograms/stove batching, weight percent as requested is equipped with the pure iron of weighing, put into 100 kilograms of vacuum medium frequency induction furnace crucibles, carry out vacuum melting, vacuum tightness≤0.1Pa.With the abundant deoxidation of silicon barium calcium; When treating that temperature reaches 1550 ℃～1650 ℃; The pure iron molten steel adds the metal La of weight percent outfit weighing as requested in crucible; Fusing, the time of mixing behind the adding metal La are 1～10 minute, then the uniform Fe-La master alloy of melt-blended molten steel are poured in the combination ingot mold it is cooled off fully, and the demoulding promptly becomes the Fe-La master alloy of Granular forms after the die sinking; Granularity is 5mm～30mm, utilizes double-deck overlay film packing to become 5 kilograms～25 kilograms/bag Fe-La master alloy product.
Embodiment 1:
Fe-La master alloy of the present invention is to be processed into by the starting material process of following weight percent: pure iron 70wt%, metal La30wt%.
Embodiment 2:
Fe-La master alloy of the present invention is to be processed into by the starting material process of following weight percent: pure iron 75wt%, metal La25wt%.
Embodiment 3:
Fe-La master alloy of the present invention is to be processed into by the starting material process of following weight percent: pure iron 80wt%, metal La20wt%.
Embodiment 4:
Fe-La master alloy of the present invention is to be processed into by the starting material process of following weight percent: pure iron: 85wt%, metal La15wt%.
Embodiment 5:
Fe-La master alloy of the present invention is to be processed into by the starting material process of following weight percent: pure iron 90wt%, metal La10wt%.
Claims (4)
1. the Fe-La master alloy is used in a steel middle-weight rare earths adding, it is characterized in that: described Fe-La master alloy is to be processed into by the starting material process of following weight percent: pure iron 70wt%～95wt%, metal La 5wt%～30wt%.
2. steel middle-weight rare earths according to claim 1 adds with Fe-mishmetal master alloy, it is characterized in that: said raw-material technical parameter: in the chemical ingredients of pure iron by weight percentage: C≤0.03, Si≤0.25; Mn≤0.25; P≤0.01, S≤0.007, Fe>=98; La>=95wt% among the metal La.
3. a steel middle-weight rare earths according to claim 1 adds the method for manufacture with the Fe-La master alloy; It is characterized in that: weight percent as requested is equipped with the weighing pure iron; Put into the vacuum medium frequency induction furnace crucible, carry out vacuum melting, vacuum tightness≤0.1Pa; With the abundant deoxidation of silicon barium calcium; When treating that temperature reaches 1550 ℃～1650 ℃, the pure iron molten steel adds the metal La of weight percent outfit weighing as requested in crucible, and fusing, the time of mixing behind the adding metal La are 1～10 minute; Then the uniform Fe-La master alloy of melt-blended molten steel is poured into combination and it is cooled off fully in the ingot mold, the demoulding promptly becomes the Fe-La master alloy of Granular forms after the die sinking.
4. steel middle-weight rare earths according to claim 3 adds the method for manufacture with the Fe-La master alloy, and it is characterized in that: the granularity of Fe-La master alloy is 5mm～30mm.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102732685A (en) * | 2012-06-20 | 2012-10-17 | 内蒙古包钢钢联股份有限公司 | Method for adding rare earth into RH refining furnace |
| CN103103434A (en) * | 2013-02-26 | 2013-05-15 | 内蒙古包钢钢联股份有限公司 | LaFeSiCa alloy for steel and manufacturing method thereof |
| CN103160726A (en) * | 2013-03-04 | 2013-06-19 | 内蒙古包钢钢联股份有限公司 | Carbon-iron alloy for recarburization and manufacture method thereof |
| CN103614614A (en) * | 2013-11-25 | 2014-03-05 | 内蒙古包钢钢联股份有限公司 | Lanthanum-iron alloy for rare earth steel production |
| CN103820698A (en) * | 2014-03-11 | 2014-05-28 | 包头稀土研究院 | Rare earth iron intermediate alloy and application thereof |
| CN104986373A (en) * | 2015-07-01 | 2015-10-21 | 杜先奎 | Metallurgical auxiliary material core-wrapped blocks and production device thereof |
| CN106756446A (en) * | 2016-12-16 | 2017-05-31 | 包头稀土研究院 | The hypoxemia rare earth steel preparation method of Rare-earth Iron intermediate alloy |
| CN106834851A (en) * | 2016-12-16 | 2017-06-13 | 包头稀土研究院 | Rare earth Mg-Zr alloys and preparation method thereof |
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| CN101319260A (en) * | 2008-07-17 | 2008-12-10 | 鞍钢股份有限公司 | Technique for controlling accurate addition of micro-element in steel |
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| 庄应烘等: "Fe-La系室温相关系的研究", 《中国稀土学报》 * |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102732685A (en) * | 2012-06-20 | 2012-10-17 | 内蒙古包钢钢联股份有限公司 | Method for adding rare earth into RH refining furnace |
| CN103103434A (en) * | 2013-02-26 | 2013-05-15 | 内蒙古包钢钢联股份有限公司 | LaFeSiCa alloy for steel and manufacturing method thereof |
| CN103160726A (en) * | 2013-03-04 | 2013-06-19 | 内蒙古包钢钢联股份有限公司 | Carbon-iron alloy for recarburization and manufacture method thereof |
| CN103614614A (en) * | 2013-11-25 | 2014-03-05 | 内蒙古包钢钢联股份有限公司 | Lanthanum-iron alloy for rare earth steel production |
| CN103820698A (en) * | 2014-03-11 | 2014-05-28 | 包头稀土研究院 | Rare earth iron intermediate alloy and application thereof |
| CN104986373A (en) * | 2015-07-01 | 2015-10-21 | 杜先奎 | Metallurgical auxiliary material core-wrapped blocks and production device thereof |
| CN104986373B (en) * | 2015-07-01 | 2017-10-13 | 杜先奎 | The process units of metallurgic auxiliary materials cored clamp dog |
| CN106756446A (en) * | 2016-12-16 | 2017-05-31 | 包头稀土研究院 | The hypoxemia rare earth steel preparation method of Rare-earth Iron intermediate alloy |
| CN106834851A (en) * | 2016-12-16 | 2017-06-13 | 包头稀土研究院 | Rare earth Mg-Zr alloys and preparation method thereof |
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Application publication date: 20120314 |