CN103627847B - For the mixed rare earth of lanthanum and cerium iron alloy that rare earth steel is produced - Google Patents
For the mixed rare earth of lanthanum and cerium iron alloy that rare earth steel is produced Download PDFInfo
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- CN103627847B CN103627847B CN201310603583.2A CN201310603583A CN103627847B CN 103627847 B CN103627847 B CN 103627847B CN 201310603583 A CN201310603583 A CN 201310603583A CN 103627847 B CN103627847 B CN 103627847B
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Abstract
The invention discloses a kind of mixed rare earth of lanthanum and cerium iron alloy produced for rare earth steel, its chemical composition is according to weight percent meter, comprise: lanthanum >=4.0%, cerium >=7.5%, 0.02%≤carbon≤0.05%, 0.006%≤phosphorus≤0.010% and 0.004%≤sulphur≤0.005%, lanthanum+cerium < 20%, all the other are iron and impurity.When mixed rare earth of lanthanum and cerium iron alloy of the present invention is for smelting high-quality rare earth steel, because proportion is close to the proportion of steel, can fuse in steel fast in refining process, solve the difficult problem that long-term restriction rare earth in steel adds, also improve the recovery rate of rare earth simultaneously.
Description
Technical field
The present invention relates to metal material field, specifically, relate to a kind of mixed rare earth of lanthanum and cerium iron alloy produced for rare earth steel.
Background technology
At present, the additive that rare earth adopts as steel-making is widely used, and rare earth in steel mainly contains three and acts on greatly: cleaning action, metamorphism and Microalloying Effect.Rare earth adds in molten steel the effect playing desulfurization, deoxidation, change inclusion morphology, can improve the plasticity of steel, punching performance, low-temperature impact toughness, wear resisting property, corrosion resistance nature, can also improve the welding property of steel.Add in present STEELMAKING PRODUCTION rare earth the most frequently used have two kinds of methods:
One is rare earth alloy.The methods such as rare earth alloy makes bulk or powdery alloy, and bulk alloy is used for wrapping input greatly, and powdery alloy dusts in generally adopting and wrapping greatly, die casting feed trumpet dusts add in steel.
Two is noriums.Rare earth metal makes silk or bar-shaped, and thread rare earth metal is used 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.But because rare earth metal is active strong, proportion, lower than steel, is difficult to join in the molten steel of more than 1600 DEG C, and scaling loss is serious, and recovery rate is very low.In addition, although rare earth metal has very strong desulfurization, deoxidizing capacity, if but when rare earth metal directly being dropped into molten steel, due to produce rare earth-oxygen-sulphur be mingled with fusing point high, than great, be difficult to assemble float and get rid of, thus in the process of removal of impurities, the purity of molten steel be reduced simultaneously because getting rid of not to the utmost, affecting quality product.
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 control, so be the stove that melting contains the refractory alloy of the active element such as aluminium, titanium and the more suitable of Precise Alloy.
Chinese patent CN1570178A disclose a kind of for make steel containing ferrocolumbium, its 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, its 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 for silicon steel production and preparation method thereof, and its 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 mixed rare earth of lanthanum and cerium iron alloy produced for rare earth steel, for replacing former rare earth metal or feeding rare-earth wires as the additive adopted in steel-making, not only make use of three of rare earth in steel better to act on greatly, but also do not affect adding of other alloy content, what fundamentally solve rare earth in steel effectively adds problem, significantly improves rare earth recovery rate.
Technical scheme of the present invention is as follows:
A kind of mixed rare earth of lanthanum and cerium iron alloy produced for rare earth steel, its chemical composition is according to weight percent meter, comprise: lanthanum >=4.0%, cerium >=7.5%, 0.02%≤carbon≤0.05%, 0.006%≤phosphorus≤0.010% and 0.004%≤sulphur≤0.005%, lanthanum+cerium < 20%, all the other are iron and impurity.
Further: the content of lanthanum is 5.0%, the content of cerium is 9.3%, and the content of carbon is 0.04%, and the content of phosphorus is 0.008%, and the content of sulphur is 0.005%, and all the other are iron and impurity.
Further: the content of lanthanum is 6.5%, the content of cerium is 12.0%, and the content of carbon is 0.03%, and the content of phosphorus is 0.007%, and the content of sulphur is 0.004%, and all the other are iron and impurity.
Further: the content of lanthanum is 4.0%, the content of cerium is 7.5%, and the content of carbon is 0.02%, and the content of phosphorus is 0.006%, and the content of sulphur is 0.004%, all the other be Fe and impurity.
Technique effect of the present invention is as follows:
1, the present invention is for replacing former rare earth metal or feeding rare-earth wires as the additive adopted in steel-making, not only make use of three of rare earth in steel better and acts on greatly, but also do not affect adding of other alloy content.
2, invention increases the recovery rate of rare earth.Improve rare earth recovery rate 3 times, ton steel profit about 80 yuan.
3, when mixed rare earth of lanthanum and cerium iron alloy of the present invention is for smelting high-quality rare earth steel, because proportion is close to the proportion of steel, can fuse in steel fast in refining process, solving the difficult problem that long-term restriction rare earth in steel adds.
4, the present invention accurately can control the content of lanthanum cerium mischmetal in steel, reduces the cost of rare earth; The chemical reaction accelerating the harmful elements such as O, S, N, P in rare earth and steel can also be played, floating advantageously in steel inclusion is got rid of, realize the deep purifying to molten steel, by the useful effect of microalloying of rare earth, plasticity, punching performance, low-temperature impact toughness, the corrosion resistance nature of further raising steel, can also improve the welding property of steel.
5, product of the present invention is not easily oxidized, and stable components is conducive to prolonged storage.
Embodiment
For a more detailed description to the present invention by embodiment below.These embodiments are only the descriptions to best mode for carrying out the invention, do not have any restriction to scope of the present invention.
In the present invention, for rare earth steel produce mixed rare earth of lanthanum and cerium iron alloy according to weight percent meter, its chemical composition comprises: lanthanum (La): >=4.0%, cerium (Ce): >=7.5%, lanthanum (La)+cerium (Ce): < 20%, carbon (C) :≤0.05%, phosphorus (P) :≤0.010%, sulphur (S) :≤0.005%, all the other are iron (Fe) and other inevitable impurity.
Embodiment 1
Select high-quality technically pure iron and content be 35% lanthanum (La), 65% the mixed rare earth alloy of cerium (Ce) be raw material, select the vacuum induction furnace being lined with alkaline earth metal oxide crucible as smelting apparatus, during melting, adopt the smelting parameters such as different smelting temperatures, pressure according to the difference of content of rare earth.For the mixed rare earth of lanthanum and cerium iron alloy that rare earth steel is produced, its chemical composition, according to weight percent meter, comprising: La:5.0%, Ce:9.3%, C:0.04%, P:0.008%, S:0.005%, and all the other are Fe and other inevitable impurity.
By this mishmetal iron alloy for the production of Heavy Plate in Baotou Steel Corp. production line Q550D steel grade, significantly improve rare earth recovery rate, comparing result is in table 1.
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 | 17 | 7 | 41 |
| Contrast rare earth alloy | 210 | 100 | 11 | 11 |
Embodiment 2
Select that high-quality technically pure iron and content are 35% lanthanum, the mixed rare earth alloy of 65% cerium is raw material, select the vacuum induction furnace being lined with alkaline earth metal oxide crucible as smelting apparatus, during melting, adopt the smelting parameters such as different smelting temperatures, pressure according to the difference of content of rare earth.For the mixed rare earth of lanthanum and cerium iron alloy that rare earth steel is produced, its chemical composition, according to weight percent meter, comprising: La:6.5%, Ce:12.0%, C:0.03%, P:0.007%, S:0.004%, and all the other are Fe and other inevitable impurity.
By this mishmetal iron alloy for the production of Heavy Plate in Baotou Steel Corp. production line Q550D steel grade, significantly improve rare earth recovery rate, comparing result is in table 2.
Table 2 recovery rate comparing result
| Rare earth alloy kind | Ladle volume (t) | Add-on (ppm) | Detection level (ppm) | Recovery rate (%) |
| The present embodiment | 210 | 18 | 8 | 44 |
| Contrast rare earth alloy | 210 | 100 | 13 | 13 |
Embodiment 3
Select that high-quality technically pure iron and content are 35% lanthanum, the mixed rare earth alloy of 65% cerium is raw material, select the vacuum induction furnace being lined with alkaline earth metal oxide crucible as smelting apparatus, during melting, adopt the smelting parameters such as different smelting temperatures, pressure according to the difference of content of rare earth.For the mixed rare earth of lanthanum and cerium iron alloy that rare earth steel is produced, its chemical composition, according to weight percent meter, comprising: La:4.0%, Ce:7.5%, C:0.02%, P:0.006%, S:0.004%, and all the other are Fe and other inevitable impurity.
By this mishmetal iron alloy for the production of Heavy Plate in Baotou Steel Corp. production line Q550D steel grade, significantly improve rare earth recovery rate, 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 |
| Contrast rare earth alloy | 210 | 100 | 14 | 14 |
Claims (4)
1. the mixed rare earth of lanthanum and cerium iron alloy produced for rare earth steel, it is characterized in that, its chemical composition is according to weight percent meter, comprise: lanthanum >=4.0%, cerium >=7.5%, 0.02%≤carbon≤0.05%, 0.006%≤phosphorus≤0.010% and 0.004%≤sulphur≤0.005%, lanthanum+cerium < 20%, all the other are iron and impurity.
2., as claimed in claim 1 for the mixed rare earth of lanthanum and cerium iron alloy that rare earth steel is produced, it is characterized in that: the content of lanthanum is 5.0%, the content of cerium is 9.3%, the content of carbon is 0.04%, the content of phosphorus is 0.008%, and the content of sulphur is 0.005%, and all the other are iron and impurity.
3., as claimed in claim 1 for the mixed rare earth of lanthanum and cerium iron alloy that rare earth steel is produced, it is characterized in that: the content of lanthanum is 6.5%, the content of cerium is 12.0%, the content of carbon is 0.03%, the content of phosphorus is 0.007%, and the content of sulphur is 0.004%, and all the other are iron and impurity.
4., as claimed in claim 1 for the mixed rare earth of lanthanum and cerium iron alloy that rare earth steel is produced, it is characterized in that: the content of lanthanum is 4.0%, the content of cerium is 7.5%, the content of carbon is 0.02%, the content of phosphorus is 0.006%, and the content of sulphur is 0.004%, and all the other are Fe and impurity.
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| CN109439999A (en) * | 2018-11-29 | 2019-03-08 | 丹阳市凯鑫合金材料有限公司 | A method of improving expansion alloy cold-heading silk material yield rate |
| CN113355586A (en) * | 2021-06-08 | 2021-09-07 | 安徽工业大学 | Method for producing rare earth ferroalloy by using alloy steel waste as raw material |
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| CN1372013A (en) * | 2001-02-28 | 2002-10-02 | 山东博山腾升机械制造有限公司 | Technology for making high rareearth ferrous alloy in mine heating furnace and products thereof |
| 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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| CN1372013A (en) * | 2001-02-28 | 2002-10-02 | 山东博山腾升机械制造有限公司 | Technology for making high rareearth ferrous alloy in mine heating furnace and products thereof |
| 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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