CN103131935A - REFeSiCa alloy used to be added in steel, and manufacturing method thereof - Google Patents
REFeSiCa alloy used to be added in steel, and manufacturing method thereof Download PDFInfo
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- CN103131935A CN103131935A CN2013100597982A CN201310059798A CN103131935A CN 103131935 A CN103131935 A CN 103131935A CN 2013100597982 A CN2013100597982 A CN 2013100597982A CN 201310059798 A CN201310059798 A CN 201310059798A CN 103131935 A CN103131935 A CN 103131935A
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Abstract
The invention relates to a REFeSiCa alloy used to be added in steel, and a manufacturing method thereof. The invention belongs to the technical field of steel metallurgy. The alloy is processed by using the raw materials of, by weight, 65-90% of pure iron, 30-5% of mixed rare earth metal, and 5% of SiCa alloy and auxiliary materials. The raw materials are weighed according to the requirement by the weight percentages; the pure iron is placed in a vacuum medium-frequency induction furnace crucible and is subjected to vacuum smelting; silicon-barium-calcium is used for sufficiently deoxidizing; the weighed mixed rare earth metal is added into the molten steel in the crucible; the mixture are molten and well mixed; the obtained REFeSiCa alloy molten steel is cast into a combined ingot mold and is completely cooled; mold-opening and de-molding are carried out, such that REFeSiCa intermediate alloy with a particle size of 5-30mm is obtained; and the product is packaged into REFeSiCa intermediate alloy products with a specification of 5-25kg/package by using double-layer film.
Description
One, affiliated technical field
The invention belongs to the steel-making continuous casting production technology, namely technical field of ferrous metallurgy, be specifically related to the REFeSiCa master alloy and the manufacture method thereof that add rare earth to use in a kind of steel-making continuous casting production.
Two, background technology
China is the rare earth big country of global rare earth resource and rare earth output first, it is again rare earth consumption big country, be also the big steel country of output of steel first, but the rolling shapes quality compares with Foreign Advanced Lerel and also have sizable gap, still have a considerable amount of steel to need import.Rare earth in steel has cleaning molten steel, make inclusion modification and Microalloying Effect, the transverse impact toughness of heavy rail, steel plate, weldless steel tube, bar is significantly improved, and resistance to oxidation and corrosion resistance 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 steel, are one of effective measure that improve steel, Developing New Variety.
Since nineteen fifties, carried out the research work of a large amount of relevant rare earth in steel effects both at home and abroad, obtain very important achievement, monograph, patent of invention;
After twentieth century 70, the eighties, rare earth steel enters China Steel product list as matured product, and the sheet material kind in rare earth steel accounts for the overwhelming majority;
The effect of RE in steel is summarized as purification, rotten and microalloying three acts on greatly; The cleaning action of RE Elements on Steel, but the degree of depth reduces the content of oxygen and sulphur; The metamorphism of inclusion in RE Elements on Steel can change inclusion (MnS, Al
2O
3) character, form and distribution, calcium is processed and to be recognized is the comparatively economically viable technical measures that obtain low impurity steel; The Microalloying Effect of RE Elements on 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 by force the local attenuation, comprehensively improve the performance of steel, improve the steel product differentiation.
Enter nineteen nineties, the alloying action of RE in steel obtains broad research, and using for rare earth in steel provides broad space more.
The late 20th century, initial stage 21st century, STEELMAKING PRODUCTION enters the sequence casting epoch, and rare earth steel production but mouth is gradually quiet---and rare earth steel output significantly descends.
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) technique, tundish feeding rare-earth wires (coating iron sheet) technique, ladle are fed rare earth (RESiCa, RECa) composite core-spun yarn technique.
Rare earth adding technology is different, and the rate of recovery of rare earth is also different.And the rate of recovery of rare earth is high, means residual many of rare earth 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 technique, is will with wire feeder
Rare earth bundle component wire (silicon calcium powder and rare-earth wires being coated with iron sheet) feeding ladle in.Steel grade without VD technique adopts at refining later stage hello rare earth (RESiCa, RECa) composite core-spun yarn, feeds rare earth (RESiCa, RECa) composite core-spun yarn through the steel grade employing of VD (RH) technique after VD (RH).
Feeding Rare Earth Wire in Continuous Casting Mould (coating iron sheet) technique is with in rare-earth wires (coating iron sheet) feeding crystallizer 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 to fill many wire feeders, wire feeder is placed and is subject to on-the-spot restriction, also affects workman's operation.
Tundish feeding rare-earth wires (coating iron sheet) technique is with T-shaped mouthful of rare-earth wires (coating iron sheet) feeding tundish 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 crystallizer from T-shaped mouthful of tundish certain hour, and rare earth has the more sufficient time to spread in molten steel, and rare earth in steel is evenly distributed.In addition, also create condition for the re inclusion floating, played the cleaning molten steel effect.
In today that smelting control techniques and the steel cleanliness factor of steel improves constantly, the effect of rare earth element in steel can obtain more effective control and better performance; In the today that faces steel product market dog-eat-dog competition, rare earth element can obtain more effective comprehensive utilization in steel; Improve the differentiation of steel product, the market competitiveness of enhancing steel product with this strategic element of rare earth, the resources advantage of rare earth is converted into species the advantage and the economic advantages of steel product, makes 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 for overcoming existing steel middle-weight rare earths defective and the deficiency of technique and rare earth material form, provide a kind of steel-making continuous casting to produce middle-weight rare earths and add with REFeSiCa master alloy and manufacture method thereof.
The technical solution used in the present invention is as described below for achieving the above object.
REFeSiCa master alloy of the present invention is comprised of the starting material of following weight percent: pure iron 65%～90%, norium 30%～5%, SiCa alloy and subsidiary material 5%.
Continuous casting production steel middle-weight rare earths of the present invention adds with the REFeSiCa master alloy to be made in accordance with the following methods:
At first according to 5～500 kilograms/stove batching, weight percent as requested is equipped with the pure iron of weighing, put into 100 kilograms of medium-frequency induction furnace vacuum crucibles, carry out vacuum melting, vacuum tightness≤60Pa.With the abundant deoxidation of silicon barium calcium, when temperature reaches 1550 ℃～1650 ℃, the pure iron molten steel adds weight percent as requested to be equipped with the norium of weighing in the crucible, adding fusing, mixing time after norium is 1～10 minute, then melt-blended uniform REFeSiCa master alloy molten steel being poured in the combination ingot mold makes it fully cooling, after die sinking, the demoulding namely becomes the REFeSiCa master alloy of Granular forms, granularity is 5mm～30mm, utilizes double-deck overlay film packing to become the REFeSiCa master alloy product of 5 kilograms～25 kilograms/bag.
The chemical composition of product of the present invention and weight percentage:
Chemical composition: pure Fe, norium, SiCa alloy and subsidiary material.
Described starting material and technical parameter:
Pure Fe 〉=98%, norium 〉=99%
Pure iron chemical composition (%): C≤0.03, Si≤0.25, Mn≤0.25, P≤0.01, S≤0.007, Fe 〉=98, other (summary).
Norium chemical composition (%): RE 〉=99.
Product of the present invention is held three keys in 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 composition that guarantees REFeSiCa master alloy product particle.
(3) granularity of REFeSiCa master alloy product particle is 5mm～30mm,
Of the present inventionly add norium with REFeSiCa master alloy form in steel, have following obvious advantage and effect:
(1) do not increase equipment and operator, simple to operation, the shortening of rare earth adding technology operating time, efficient improve, and have solved a difficult problem that adds rare earth in the steel, and rare earth adds novel form, efficient;
(2) because adding the simple to operation of master alloy form, the running cost that the steel middle-weight rare earths adds reduces;
(3) because REFeSiCa master alloy product is Granular forms, fusing point is higher, and the scaling loss of rare earth significantly reduces, and the recovery rate of rare earth increases substantially, and the material cost that the steel middle-weight rare earths adds reduces;
(4) recovery rate due to rare earth increases substantially, and the add-on of rare earth significantly reduces, and the size reduction of steel Rare Earth Inclusions, quantity reduce, and the quality of steel product improves;
(5) produce without molten steel splash, smoke dust, rare earth add operational safety reliable, operating environment is effectively improved;
(6) because REFeSiCa master alloy product is Granular forms, fusing point is higher, and proportion is higher, rare earth being evenly distributed in molten steel;
(7) because the shortening of rare earth adding technology operating time, efficient improve, STEELMAKING PRODUCTION efficient improves; Simultaneously, the scaling loss of rare earth significantly reduces, and the recovery rate of rare earth increases substantially, and the add-on of rare earth is significantly reduced, and the quality of steel product improves, and the comprehensive cost of rare earth steel steel product reduces;
Four, embodiment
Describe the present invention below in conjunction with embodiment.
Embodiment 1:
REFeSiCa master alloy of the present invention is to be processed into by the starting material process of following weight percent: pure iron 70%, norium 25%, SiCa alloy and subsidiary material 5%.
The REFeSiCa master alloy is made in accordance with the following methods:
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 medium-frequency induction furnace vacuum crucibles, carry out vacuum melting, vacuum tightness≤50Pa.With the abundant deoxidation of silicon barium calcium, when temperature reaches 1630 ℃, the pure iron molten steel adds weight percent as requested to be equipped with the norium of weighing in the crucible, adding fusing, mixing time after norium is 2 minutes, then melt-blended REFeSiCa master alloy molten steel being poured in the combination ingot mold makes it fully cooling, after die sinking, the demoulding namely becomes the REFeSiCa master alloy of Granular forms, granularity is 5mm～10mm, utilizes double-deck overlay film packing to become the REFeSiCa master alloy product of 5～25 kilograms/bag.
Embodiment 2:
REFeSiCa master alloy of the present invention is to be processed into by the starting material process of following weight percent: pure iron 75%, norium 20%, SiCa alloy and subsidiary material 5%.
The REFeSiCa master alloy is made in accordance with the following methods:
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≤60Pa.With the abundant deoxidation of silicon barium calcium, when temperature reaches 1620 ℃, the pure iron molten steel adds weight percent as requested to be equipped with the norium of weighing in the crucible, adding fusing, mixing time after norium is 1.5 minutes, then melt-blended uniform REFeSiCa master alloy molten steel being poured in the combination ingot mold makes it fully cooling, after die sinking, the demoulding namely becomes the REFeSiCa master alloy of Granular forms, granularity is 5mm～15mm, utilizes double-deck overlay film packing to become the REFeSiCa master alloy product of kilogram, kilogram/bag.
Embodiment 3:
REFeSiCa master alloy of the present invention is to be processed into by the starting material process of following weight percent: pure iron 80%, norium 15%, SiCa alloy and subsidiary material 5%.
The REFeSiCa master alloy is made in accordance with the following methods:
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≤45Pa.With the abundant deoxidation of silicon barium calcium, when temperature reaches 1620 ℃～1640 ℃, the pure iron molten steel adds weight percent as requested to be equipped with the norium of weighing in the crucible, adding fusing, mixing time after norium is 2 minutes, then melt-blended uniform REFeSiCa master alloy molten steel being poured in the combination ingot mold makes it fully cooling, after die sinking, the demoulding namely becomes the REFeSiCa master alloy of Granular forms, granularity is 5mm～20mm, utilizes double-deck overlay film packing to become the REFeSiCa master alloy product of 5 kilograms～25 kilograms/bag.
Embodiment 4:
REFeSiCa master alloy of the present invention is to be processed into by the starting material process of following weight percent: pure iron: 85%, and norium 10%, SiCa alloy and subsidiary material 5%.
The REFeSiCa master alloy is made in accordance with the following methods:
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≤35Pa.With the abundant deoxidation of silicon barium calcium, when temperature reaches approximately 1625 ℃, the pure iron molten steel adds weight percent as requested to be equipped with the norium of weighing in the crucible, adding fusing, mixing time after norium is 2 minutes, then melt-blended uniform REFeSiCa master alloy molten steel being poured in the combination ingot mold makes it fully cooling, after die sinking, the demoulding namely becomes the REFeSiCa master alloy of Granular forms, granularity is 5mm～25mm, utilizes double-deck overlay film packing to become the REFeSiCa master alloy product of 5 kilograms～25 kilograms/bag.
Embodiment 5:
REFeSiCa master alloy of the present invention is to be processed into by the starting material process of following weight percent: pure iron 90%, norium 5%, SiCa alloy and subsidiary material 5%.
The REFeSiCa master alloy is made in accordance with the following methods:
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≤40Pa.with the abundant deoxidation of silicon barium calcium, when temperature reaches 1625 ℃～1635 ℃, the pure iron molten steel adds weight percent as requested to be equipped with the norium of weighing in the crucible, add the fusing after norium, mixing time is 1.5 minutes, then melt-blended uniform REFeSiCa master alloy molten steel being poured in the combination ingot mold makes it fully cooling, after die sinking, the demoulding namely becomes the REFeSiCa master alloy of Granular forms, granularity is 5mm～30mm, utilize double-deck overlay film packing to become the REFeSiCa master alloy product of 5 kilograms～25 kilograms/bag.
Claims (2)
1. add the REFeSiCa alloy of use in a steel, it is characterized in that by the following starting material that respectively account for weight percent through being processed into: pure iron 65%～90%, norium 30%～5%, SiCa alloy and subsidiary material 5%; The weight percent chemical composition of pure iron is: C≤0.03, Si≤0.25, Mn≤0.25, P≤0.01, S≤0.007, Fe 〉=98, other impurity element for detecting; The weight percent chemical composition of norium is RE 〉=98.
2. add as claimed in claim 1 the manufacture method of the REFeSiCa alloy of use in a kind of steel of feature, it is characterized in that:
first prepare burden according to 5 kilograms～500 kilograms/stove, to require to be equipped with according to weight percent the pure iron of weighing, put into 100 kilograms of vacuum medium frequency induction furnace crucibles, carry out vacuum melting, vacuum tightness≤60Pa, with the abundant deoxidation of silicon barium calcium, when temperature reaches 1550 ℃～1650 ℃, add norium in molten steel in the crucible, fusing, mixing time is 1 minute～10 minutes, then melt-blended uniform REFeSiCa alloy molten steel being poured in the combination ingot mold makes it fully cooling, after die sinking, the demoulding namely becomes the REFeSiCa master alloy of Granular forms, granularity is 5imm～30mm, utilize double-deck overlay film packing to become the REFeSiCa master alloy product of 5 kilograms～25 kilograms/bag.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105316561A (en) * | 2014-08-04 | 2016-02-10 | 陆丰市东煊实业有限公司 | Method for preparing steel additives through waste rare earth permanent magnet materials |
| CN105316562A (en) * | 2014-08-04 | 2016-02-10 | 陆丰市东煊实业有限公司 | Method for preparing steel additives through waste rare earth materials |
| CN109972026A (en) * | 2019-04-15 | 2019-07-05 | 南京浦江合金材料股份有限公司 | A kind of preparation process pouring method preparation silicon strontium inoculant using dam-type |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102383028A (en) * | 2011-11-03 | 2012-03-21 | 内蒙古包钢钢联股份有限公司 | Fe and mixed rare earth intermediate alloy for adding rare earth into steel and preparation method for Fe and mixed rare earth intermediate alloy |
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- 2013-02-26 CN CN2013100597982A patent/CN103131935A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102383028A (en) * | 2011-11-03 | 2012-03-21 | 内蒙古包钢钢联股份有限公司 | Fe and mixed rare earth intermediate alloy for adding rare earth into steel and preparation method for Fe and mixed rare earth intermediate alloy |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105316561A (en) * | 2014-08-04 | 2016-02-10 | 陆丰市东煊实业有限公司 | Method for preparing steel additives through waste rare earth permanent magnet materials |
| CN105316562A (en) * | 2014-08-04 | 2016-02-10 | 陆丰市东煊实业有限公司 | Method for preparing steel additives through waste rare earth materials |
| CN105316562B (en) * | 2014-08-04 | 2018-01-23 | 陆丰市东煊实业有限公司 | A kind of method that steel additive agent is prepared using rare earth waste |
| CN109972026A (en) * | 2019-04-15 | 2019-07-05 | 南京浦江合金材料股份有限公司 | A kind of preparation process pouring method preparation silicon strontium inoculant using dam-type |
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Application publication date: 20130605 |