CN103114236A - CeFeSiCa alloy added into steel and manufacturing method thereof - Google Patents
CeFeSiCa alloy added into steel and manufacturing method thereof Download PDFInfo
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- CN103114236A CN103114236A CN201310059063XA CN201310059063A CN103114236A CN 103114236 A CN103114236 A CN 103114236A CN 201310059063X A CN201310059063X A CN 201310059063XA CN 201310059063 A CN201310059063 A CN 201310059063A CN 103114236 A CN103114236 A CN 103114236A
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Abstract
The invention relates to a CeFeSiCa alloy added into steel and a manufacturing method thereof and belongs to the technical field of ferrous metallurgy. The CeFeSiCa alloy is prepared from the following raw materials: pure iron, single rare earth cerium, a SiCa alloy and auxiliary materials. The raw materials are prepared and weighed in percentage by weight as required, firstly the pure iron is placed into a crucible of a vacuum medium frequency induction furnace, and vacuum melting is carried out; full deoxidization is carried out with silicon-barium-calcium, the single rare earth metal cerium prepared and weighed in percentage by weight as required is added into pure iron molten steel in the crucible, after the single rare earth metal cerium added into molten steel is molten, uniformly mixing is carried out, then uniformly mixed molten CeFeSiCa intermediate alloy molten steel is poured into an assembled ingot mould to be completely cooled, demoulding is carried out after a mould is opened, namely a CeFeSiCa intermediate alloy block is formed, granularity is 5-30mm, and a CeFeSiCa intermediate alloy product in the specification of 5-25kg/bag is packaged by utilizing a double-layer tectorial membrane.
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 a kind of steel-making continuous casting production middle-weight rare earths and add with CeFeSiCa master alloy and manufacture method thereof.
Two, background technology
China is the Rare Earth Production 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 its plasticity and anti-lamellar tearing performance.The production for many years of domestic and international many steel mills facts have proved, adds rare earth in steel, is 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 is but day by day 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.
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 in the continuous casting production later stage, 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 CeFeSiCa master alloy and manufacture method thereof.
The technical solution used in the present invention is as described below for achieving the above object.
CeFeSiCa master alloy of the present invention is comprised of the starting material of following weight percent: pure iron 65%～90%, single rare earth metallic cerium 30%～5%, SiCa alloy and subsidiary material 5%.
Continuous casting production steel middle-weight rare earths of the present invention adds with the CeFeSiCa master alloy to be 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≤60Pa.with the abundant deoxidation of silicon barium calcium, when temperature reaches 1550 ℃～1650 ℃, add weight percent as requested to be equipped with the single rare earth metallic cerium of weighing in pure iron molten steel in the crucible, add the fusing after the single rare earth metallic cerium, mixing time is 1～10 minute, then melt-blended uniform CeFeSiCa master alloy molten steel being poured in the combination ingot mold makes it fully cooling, after die sinking, the demoulding namely becomes the CeFeSiCa master alloy of Granular forms, granularity is 5mm～30mm, utilize double-deck overlay film packing to become the CeFeSiCa master alloy product of 5 kilograms～25 kilograms/bag.
The chemical composition of product of the present invention and weight percentage:
Chemical composition: Fe, single rare earth metallic cerium, SiCa alloy and subsidiary material.
Described starting material and technical parameter:
Pure Fe 〉=98%, single rare earth metallic cerium 〉=95%
Pure iron chemical composition (%): C≤0.03, Si≤0.25, Mn≤0.25, P≤0.01, S≤0.007, Fe 〉=98, other (summary).
Single rare earth metallic cerium chemical composition (%): Ce 〉=98.
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 CeFeSiCa master alloy product particle.
(3) granularity of CeFeSiCa master alloy product particle is 5mm～30mm,
Of the present inventionly add the single rare earth metallic cerium with CeFeSiCa 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 CeFeSiCa 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 CeFeSiCa 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;
(8) because the rare earth adding technology operating time shortens, the scaling loss of rare earth significantly reduces, and the recovery rate of rare earth increases substantially, and the add-on of rare earth significantly reduces, 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:
CeFeSiCa master alloy of the present invention is to be processed into by the starting material process of following weight percent: pure iron 70%, single rare earth metallic cerium 25%, SiCa alloy and subsidiary material 5%.
The CeFeSiCa master alloy is made in accordance with the following methods:
At first according to 100 kilograms/stove batching, will require to be equipped with the pure iron of weighing according to weight percent, 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 1650 ℃, add the single rare earth metallic cerium that requires to be equipped with weighing according to weight percent in pure iron molten steel in the crucible, adding fusing, mixing time after the single rare earth metallic cerium is 2 minutes, then the CeFeSiCa master alloy molten steel that will melt, mixes pours in the combination ingot mold and makes it fully cooling, after die sinking, the demoulding namely becomes the CeFeSiCa master alloy of Granular forms, granularity is 10mm～20mm, utilizes double-deck overlay film packing to become the CeFeSiCa master alloy product of 10 kilograms/bag.
Embodiment 2:
CeFeSiCa master alloy of the present invention is to be processed into by the starting material process of following weight percent: pure iron 75%, single rare earth metallic cerium 20%, SiCa alloy and subsidiary material 5%.Then manufacture by the following method:
At first according to 100 kilograms/stove batching, will require to be equipped with the pure iron of weighing according to weight percent, put into 100 kilograms of medium-frequency induction furnace vacuum crucibles, carry out vacuum melting, vacuum tightness 58Pa.With the abundant deoxidation of silicon barium calcium, when temperature reaches 1600 ℃, add the single rare earth metallic cerium that requires to be equipped with weighing according to weight percent in pure iron molten steel in the crucible, adding fusing, mixing time after the single rare earth metallic cerium is 7 minutes, then the CeFeSiCa master alloy molten steel that will melt, mixes pours in the combination ingot mold and makes it fully cooling, after die sinking, the demoulding namely becomes the CeFeSiCa master alloy of Granular forms, granularity is 10mm～25mm, utilizes double-deck overlay film packing to become the CeFeSiCa master alloy product of 10 kilograms/bag.
Embodiment 3:
CeFeSiCa master alloy of the present invention is to be processed into by the starting material process of following weight percent: pure iron 80%, single rare earth metallic cerium 15%, SiCa alloy and subsidiary material 5%.Then manufacture by the following method:
At first according to 100 kilograms/stove batching, will require to be equipped with the pure iron of weighing according to weight percent, put into 100 kilograms of medium-frequency induction furnace vacuum crucibles, carry out vacuum melting, vacuum tightness 55Pa.With the abundant deoxidation of silicon barium calcium, when temperature reaches 1610 ℃, add the single rare earth metallic cerium that requires to be equipped with weighing according to weight percent in pure iron molten steel in the crucible, adding fusing, mixing time after the single rare earth metallic cerium is 5 minutes, then the CeFeSiCa master alloy molten steel that will melt, mixes pours in the combination ingot mold and makes it fully cooling, after die sinking, the demoulding namely becomes the CeFeSiCa master alloy of Granular forms, granularity is 10mm～30mm, utilizes double-deck overlay film packing to become the CeFeSiCa master alloy product of 15 kilograms/bag.
Embodiment 4:
CeFeSiCa master alloy of the present invention is to be processed into by the starting material process of following weight percent: pure iron: 85%, and single rare earth metallic cerium 10%, SiCa alloy and subsidiary material 5%.Then manufacture by the following method:
At first according to 100 kilograms/stove batching, will require to be equipped with the pure iron of weighing according to weight percent, put into 100 kilograms of medium-frequency induction furnace vacuum crucibles, carry out vacuum melting, vacuum tightness 55Pa.With the abundant deoxidation of silicon barium calcium, when temperature reaches 1550 ℃, add the single rare earth metallic cerium that requires to be equipped with weighing according to weight percent in pure iron molten steel in the crucible, adding fusing, mixing time after the single rare earth metallic cerium is 10 minutes, then the CeFeSiCa master alloy molten steel that will melt, mixes pours in the combination ingot mold and makes it fully cooling, after die sinking, the demoulding namely becomes the CeFeSiCa master alloy of Granular forms, granularity is 10mm～25mm, utilizes double-deck overlay film packing to become the CeFeSiCa master alloy product of 5 kilograms/bag.
Embodiment 5:
CeFeSiCa master alloy of the present invention is to be processed into by the starting material process of following weight percent: pure iron 90%, single rare earth metallic cerium 5%, SiCa alloy and subsidiary material 5%.Then manufacture by the following method:
At first according to 100 kilograms/stove batching, will require to be equipped with the pure iron of weighing according to weight percent, put into 100 kilograms of medium-frequency induction furnace vacuum crucibles, carry out vacuum melting, vacuum tightness 45Pa.With the abundant deoxidation of silicon barium calcium, when temperature reaches 1580 ℃, add the single rare earth metallic cerium that requires to be equipped with weighing according to weight percent in pure iron molten steel in the crucible, adding fusing, mixing time after the single rare earth metallic cerium is 8 minutes, then the CeFeSiCa master alloy molten steel that will melt, mixes pours in the combination ingot mold and makes it fully cooling, after die sinking, the demoulding namely becomes the CeFeSiCa master alloy of Granular forms, granularity is 15mm～30mm, utilizes double-deck overlay film packing to become the CeFeSiCa master alloy product of 25 kilograms/bag.
Claims (2)
1. one kind is used for the CeFeSiCa alloy that steel adds, it is characterized in that described CeFeSiCa alloy is to be processed into by the starting material process of following weight percent: pure iron 65%～90%, single rare earth metallic cerium 30%～5%, SiCa alloy and subsidiary material 5%.
2. manufacture method that is used for the CeFeSiCa alloy that steel adds of feature as claimed in claim 1, it is characterized in that at first preparing burden according to 5 kilograms～500 kilograms/stove, weight percent as requested is equipped with the pure iron of weighing, put into the vacuum medium frequency induction furnace crucible, carry out vacuum melting, vacuum tightness≤60Pa, with the abundant deoxidation of silicon barium calcium, when temperature reaches 1580 ℃～1650 ℃, add weight percent as requested to be equipped with the single rare earth metallic cerium of weighing in molten steel in the crucible, then fusing, mixing time is 2 minutes～10 minutes, thereafter melt-blended uniform CeFeSiCa master alloy molten steel being poured in the combination ingot mold makes it fully cooling, after die sinking, the demoulding namely becomes the CeFeSiCa master alloy of Granular forms, granularity is 5mm～30mm, utilize double-deck overlay film packing to become the CeFeSiCa master alloy product of 5 kilograms～25 kilograms/bag.
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Cited By (2)
| 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 |
| CN114959436A (en) * | 2022-06-14 | 2022-08-30 | 浙江大学湖州研究院 | Cerium-calcium-iron alloy capable of effectively improving rare earth yield of special steel for high-end equipment |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102383029A (en) * | 2011-11-03 | 2012-03-21 | 内蒙古包钢钢联股份有限公司 | Fe-Ce intermediate alloy for adding rare earth into steel and preparation method for Fe-Ce intermediate alloy |
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- 2013-02-26 CN CN201310059063XA patent/CN103114236A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102383029A (en) * | 2011-11-03 | 2012-03-21 | 内蒙古包钢钢联股份有限公司 | Fe-Ce intermediate alloy for adding rare earth into steel and preparation method for Fe-Ce intermediate alloy |
Cited By (2)
| 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 |
| CN114959436A (en) * | 2022-06-14 | 2022-08-30 | 浙江大学湖州研究院 | Cerium-calcium-iron alloy capable of effectively improving rare earth yield of special steel for high-end equipment |
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Application publication date: 20130522 |