CN103805836A - Cerium-ferrum alloy for producing rare earth steel - Google Patents
Cerium-ferrum alloy for producing rare earth steel Download PDFInfo
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- CN103805836A CN103805836A CN201310600912.8A CN201310600912A CN103805836A CN 103805836 A CN103805836 A CN 103805836A CN 201310600912 A CN201310600912 A CN 201310600912A CN 103805836 A CN103805836 A CN 103805836A
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Abstract
The invention discloses a cerium-ferrum alloy for producing rare earth steel. The cerium-ferrum alloy comprises chemical components in percentage by weight: 8-12% of cerium, less than or equal to 0.05% of carbon, less than or equal to 0.010% of phosphorous, less than or equal to 0.005% of sulfur, and the balance of Fe and impurities. When the cerium-ferrum alloy is used for melting high-quality rare earth steel, the specific weight is close to that of steel, the cerium-ferrum alloy can be fast molten into the steel in refining process, the yield of rare earth can be increased, the content of rare earth in the steel can be accurately controlled, and the cost of the rare earth can be lowered; the chemical reaction between the rare earth and harmful elements O, S, N, P and the like in the steel can be accelerated, entrainment in the steel can be more favorably floated and eliminated so as to realize the deep purification of molten steel, the plasticity, cold bending and stamping properties, the thickness direction performance and low-temperature impact toughness of the steel can be further enhanced through the effective action of rare earth microalloying.
Description
Technical field
The present invention relates to metal material field, specifically, relate to a kind of cerium-iron alloy of producing for rare earth steel.
Background technology
At present, the additive that rare earth adopts as steel-making is widely used, rare earth in steel mainly contains three effects greatly: cleaning action, metamorphism and Microalloying Effect, rare earth adds in molten steel can play desulfurization, deoxidation, change inclusion morphology, plasticity, punching performance, low-temperature impact toughness, wear resisting property, the corrosion resistance nature of steel can be improved, the welding property of steel can also be improved.
In STEELMAKING PRODUCTION, add now rare earth the most frequently used have two kinds of methods:
The one, rare earth alloy, rare earth alloy is made bulk or powdery alloy, and block rare earth alloy drops into for large bag, and powdery rare earth alloy is generally adopted in large bag the method such as dust, die casting feed trumpet dusts and is added in steel.
The 2nd, norium.Rare earth metal is made thread or bar-shaped, and thread rare earth metal, for ladle, feed trumpet or continuous cast mold, uses in wire feeder feeding steel; Bar-shaped rare earth metal adopts the method for hanging in mould to fuse in steel.Because rare earth metal is active strong, proportion is lower than steel, rare earth metal is difficult to join in 1600 ℃ of above molten steel, rare earth metal scaling loss is serious, recovery rate is very low.
In addition, although rare earth metal has very strong desulfurization, deoxidizing capacity, if but when rare earth metal is directly dropped into molten steel, due to produce rare earth-oxygen-sulphur be mingled with fusing point high, than great, be difficult to assemble and float and get rid of, thereby in the process of removal of impurities, can, because getting rid of the purity that has reduced not to the utmost molten steel, affect quality product simultaneously.
Vacuum induction melting furnace is used for melting refractory alloy, magneticalloy, electrical alloy and high-strength steel etc., and the feature of this type of furnace is that the control ratio of furnace temperature, vacuum tightness and smelting time etc. in fusion process is easier to, so the degassed of furnace charge can be very abundant.In addition, the addition of alloy material also can accurately be controlled, so be that melting contains the active refractory alloy of element such as aluminium, titanium and the more suitable stove of Precise Alloy.
Chinese patent CN1570178A discloses a kind of ferrocolumbium that contains for making steel, chemical composition proportioning is: Si:2～70%, Nb:0.5～20%, all the other are Mn:2～70%, Sr:1～10%, B:2～20%, Al:2～20%, Ca:1～15%, one or more in RE:1～10%, the requirement of energy all promising policy deoxidation in steel making and alloying, weak point is the not mentioned impact on inclusion.
Chinese patent CN1807657A discloses a kind of liquid steel refining alterant for making steel, chemical composition proportioning is: Si:30～60%, Ba:5～25%, RE:1～15%, Ca:1～15%, Al:1～15%, Ti:1～6%, all the other are Sr:0.1～3%, Nb:0.1～3%, Mg:0.1～3%, one or more in Mn:1～15%, weak point is not mentioned rare earth recovery rate and the impact on inclusion.
Chinese patent CN102002619A discloses a kind of rare-earth silicon alloy of producing for silicon steel and preparation method thereof, and chemical composition proportioning is: RE:45～60%, Si:40～55%, C≤0.5%; P≤0.002%, S≤0.002%, weak point is the production that this rare earth alloy is only applicable to silicon steel.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of cerium-iron alloy of producing for rare earth steel, after interpolation, can significantly improve rare earth recovery rate, changes inclusion morphology, improves steel plasticity and low-temperature impact toughness.
Technical scheme of the present invention is as follows:
A cerium-iron alloy of producing for rare earth steel, its chemical composition, according to weight percent meter, comprising: cerium 8～12%, carbon≤0.05%, phosphorus≤0.010%, sulphur≤0.005%, all the other are Fe and impurity.
Further: the content of cerium is 8%, the content of carbon is 0.004%, and the content of phosphorus is 0.008%, and the content of sulphur is 0.005%, and all the other are Fe and impurity.
Further: the content of cerium is 12%, the content of carbon is 0.004%, and the content of phosphorus is 0.008%, and the content of sulphur is 0.005%, and all the other are Fe and impurity.
Further: the content of cerium is 10%, the content of carbon is 0.003%, and the content of phosphorus is 0.007%, and the content of sulphur is 0.004%, and all the other are Fe and impurity.
Technique effect of the present invention is as follows:
1, the additive of this product for replacing former rare earth metal or feeding rare-earth wires to adopt as steel-making, not only better utilised three effects greatly of rare earth in steel, but also do not affect adding of other alloy content.
2, when the cerium-iron alloy that the present invention produces is used for smelting high-quality rare earth steel, proportion, close to the proportion of steel, can fuse into fast in steel in refining process, has improved the recovery rate of rare earth, and can accurately control containing in dimension of steel middle-weight rare earths, reduce the cost of rare earth.Improve 3 times of rare earth recovery rates, approximately 30 yuan of ton steel profits.
3, the cerium-iron alloy that the present invention produces can play the chemical reaction of harmful elements such as accelerating O, S, N, P in rare earth and steel, the floating that is more conducive to steel inclusion is got rid of, realize the deep purifying to molten steel, by the useful effect of microalloying of rare earth, further improve plasticity, clod wash and punching performance, thickness directional properties, the low-temperature impact toughness etc. of steel, can also improve the welding property of steel.
4, product of the present invention is not oxidizable, and stable components is conducive to prolonged storage.
Embodiment
For a more detailed description to the present invention with embodiment below.These embodiment are only the descriptions to best mode for carrying out the invention, scope of the present invention are not had to any restriction.
The cerium-iron alloy of producing for rare earth steel, its chemical composition, according to weight percent meter, comprising: cerium (Ce): 8～12%, carbon (C) :≤0.05%, phosphorus (P) :≤0.010%, sulphur (S) :≤0.005%, all the other are Fe and other inevitable impurity.
Embodiment 1
(its chemical composition is: C≤0.005% to select high-quality technically pure iron, P≤0.010%, S≤0.005%), and the cerium metal of content >=98.0% is raw material, select the vacuum induction furnace that is lined with alkaline earth metal oxide crucible as smelting apparatus, when melting, adopt the different smelting parameters such as smelting temperature, pressure according to the difference of content of rare earth.The cerium-iron alloy of producing for rare earth steel, its chemical composition, according to weight percent meter, comprising: Ce:8%, C:0.004%, P:0.008%, S:0.005%, all the other are Fe and other inevitable impurity.
This cerium iron alloy, for the production of Heavy Plate in Baotou Steel Corp. production line BT700E steel grade, has been significantly improved to unit elongation, the low-temperature impact toughness of rare earth recovery rate and steel plate, and comparing result is respectively in table 1, table 2.
Table 1 recovery rate comparing result
| Rare earth alloy kind | Ladle volume (t) | Add-on (ppm) | Detection level (ppm) | Recovery rate (%) |
| The present embodiment | 210 | 15 | 6 | 40 |
| Contrast rare earth alloy | 210 | 100 | 12 | 12 |
Table 2 low-temperature impact toughness comparing result
Embodiment 2
(its chemical composition is: C≤0.005% to select high-quality technically pure iron, P≤0.010%, S≤0.005%), the cerium metal of selecting content >=98.0% is raw material, select the vacuum induction furnace that is lined with alkaline earth metal oxide crucible as smelting apparatus, when melting, adopt the different smelting parameters such as smelting temperature, pressure according to the difference of content of rare earth.The cerium-iron alloy of producing for rare earth steel, its chemical component weight per-cent is: Ce:12%, C:0.004%, P:0.008%, S:0.005%, all the other are Fe and other inevitable impurity.
BT700E steel grade by this cerium iron alloy for the production of the trial-production of Heavy Plate in Baotou Steel Corp. production line, has significantly improved rare earth recovery rate, and comparing result is in table 3.
Table 3 recovery rate comparing result
| Rare earth alloy kind | Ladle volume (t) | Add-on (ppm) | Detection level (ppm) | Recovery rate (%) |
| The present embodiment | 210 | 16 | 7 | 43.75 |
| Contrast rare earth alloy | 210 | 100 | 11 | 11.00 |
Embodiment 3
(its chemical composition is: C≤0.005% to select high-quality technically pure iron, P≤0.010%, S≤0.005%), the cerium metal of selecting content >=98.0% is raw material, select the vacuum induction furnace that is lined with alkaline earth metal oxide crucible as smelting apparatus, when melting, adopt the different smelting parameters such as smelting temperature, pressure according to the difference of content of rare earth.The cerium-iron alloy of producing for rare earth steel, its chemical component weight per-cent is: Ce:10%, C:0.003%, P:0.007%, S:0.004%, all the other are Fe and other inevitable impurity.
BT700E steel grade by this cerium iron alloy for the production of the trial-production of Heavy Plate in Baotou Steel Corp. production line, has significantly improved rare earth recovery rate, and comparing result is in table 4.
Table 4 recovery rate comparing result
| Rare earth alloy kind | Ladle volume (t) | Add-on (ppm) | Detection level (ppm) | Recovery rate (%) |
| The present embodiment | 210 | 16 | 7 | 43 |
| Contrast rare earth alloy | 210 | 100 | 14 | 14 |
Claims (4)
1. a cerium-iron alloy of producing for rare earth steel, is characterized in that, its chemical composition, according to weight percent meter, comprising: cerium 8～12%, carbon≤0.05%, phosphorus≤0.010%, sulphur≤0.005%, all the other are Fe and impurity.
2. the cerium-iron alloy of producing for rare earth steel as claimed in claim 1, is characterized in that: the content of cerium is 8%, the content of carbon is 0.004%, and the content of phosphorus is 0.008%, and the content of sulphur is 0.005%, and all the other are Fe and impurity.
3. the cerium-iron alloy of producing for rare earth steel as claimed in claim 1, is characterized in that: the content of cerium is 12%, the content of carbon is 0.004%, and the content of phosphorus is 0.008%, and the content of sulphur is 0.005%, and all the other are Fe and impurity.
4. the cerium-iron alloy of producing for rare earth steel as claimed in claim 1, is characterized in that: the content of cerium is 10%, the content of carbon is 0.003%, and the content of phosphorus is 0.007%, and the content of sulphur is 0.004%, and all the other are Fe and impurity.
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| CN201310600912.8A CN103805836A (en) | 2013-11-25 | 2013-11-25 | Cerium-ferrum alloy for producing rare earth steel |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106834889A (en) * | 2016-12-16 | 2017-06-13 | 包头稀土研究院 | Cerium-iron alloy and preparation method thereof |
| CN113814360A (en) * | 2021-09-18 | 2021-12-21 | 江西理工大学 | Rare earth steel spectrum standard sample and preparation method thereof |
| CN114622130A (en) * | 2022-02-18 | 2022-06-14 | 包头钢铁（集团）有限责任公司 | Rare earth alloy suitable for bainite steel inclusion control and adding process thereof |
| 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 (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101319260A (en) * | 2008-07-17 | 2008-12-10 | 鞍钢股份有限公司 | Process method for controlling accurate addition of trace elements in steel |
| 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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- 2013-11-25 CN CN201310600912.8A patent/CN103805836A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101319260A (en) * | 2008-07-17 | 2008-12-10 | 鞍钢股份有限公司 | Process method for controlling accurate addition of trace elements in steel |
| 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 (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106834889A (en) * | 2016-12-16 | 2017-06-13 | 包头稀土研究院 | Cerium-iron alloy and preparation method thereof |
| CN113814360A (en) * | 2021-09-18 | 2021-12-21 | 江西理工大学 | Rare earth steel spectrum standard sample and preparation method thereof |
| CN113814360B (en) * | 2021-09-18 | 2023-08-11 | 江西理工大学 | Rare earth steel spectrum standard sample and preparation method thereof |
| CN114622130A (en) * | 2022-02-18 | 2022-06-14 | 包头钢铁（集团）有限责任公司 | Rare earth alloy suitable for bainite steel inclusion control and adding process thereof |
| 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: 20140521 |