CN1098365C - Rare-earth metal wire - Google Patents
Rare-earth metal wire Download PDFInfo
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- CN1098365C CN1098365C CN00115903A CN00115903A CN1098365C CN 1098365 C CN1098365 C CN 1098365C CN 00115903 A CN00115903 A CN 00115903A CN 00115903 A CN00115903 A CN 00115903A CN 1098365 C CN1098365 C CN 1098365C
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- earth metal
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Abstract
The present invention provides a rare earth metal wire with high purity, high plasticity and high strength. Because the content of foreign substances which are contained in the rare earth metal wire and are insoluble in hydrochloric acid with the (volume) concentration of 20 to 30% is less than 0.2%(weight), the properties are achieved. The foreign substances are composed of rare earth metals, especially trivalent oxides of lanthanum, cerium, praseodymium and neodymium, and aluminosilicate substances of calcium.
Description
The present invention relates to rare-earth metal wire, especially relate to rare-earth metal wire as steel-making additive.
The application of rare-earth metal wire in steel from early stage do scavenging agent, alterant, reductor etc. develop into now do the alloying agent.Studies have shown that in a large number in recent years, rare earth metal have certain solid solubility in the matrix of steel, thereby can produce significantly influence to tissue, the performance of steel.Therefore in molten steel, add rare earth metal, will guarantee that not only predetermined amounts adds molten steel with it, and will guarantee that added rare earth metal is contained in the steel with predetermined amount, especially is solid-solubilized in the steel.Through exploration for many years,, generally acknowledge that the feeding rare-earth metal wire is the method for preferably adding rare earth metal in continuous cast mold in the art.For guaranteeing successfully rare-earth metal wire to be fed in the continuous cast mold and the rare earth metal of predetermined amount that guarantees to have contained solid solution in the steel, must guarantee that then described rare-earth metal wire has certain plasticity and intensity, so that feeding the silk described in the silk process constantly, and guarantee that added rare earth metal contains higher purity, so that it has predetermined content or solid solution capacity in steel.
ZL94108075.7 patent and CN1219600A disclose the method that improves rare earth metal plasticity and intensity.This method contains plasticity and toughness that a certain amount of magnesium and/or yttrium improve this rare earth metal by making rare earth metal.Though what this method had reached expection improves plasticity and flexible purpose, but magnesium and/or yttrium contained in this rare earth metal are not the necessary rare earth elements of some specified property that improves or reach steel, that is to say that they do not have active influence for the specified property that improves steel, because rare earth metal has been brought a certain amount of magnesium into and/or yttrium means that then the significant quantity of the rare earth metal of the technological standard defined in the steel reduces.Therefore, the present technique field is being sought plasticity, good strength always but is not being contained the rare-earth metal wire of magnesium and/or yttrium.
In the present invention, the plasticity of rare-earth metal wire and intensity are to define by 4.4 and 4.5 sections among the ferrous metallurgy industry standard YB/T010-92 of the People's Republic of China (PRC), and promptly the repeated flex of rare-earth metal wire does not fracture for three times, and tensile strength is greater than 120Mpa.
The object of the present invention is to provide the highly purified rare-earth metal wire of a kind of plasticity, good strength.
Through long-term exploration, the inventor finds: inclusion contained in the rare-earth metal wire has a significant impact for its plasticity and intensity.Studies show that further described inclusion is to be that the hydrochloric acid soln of 20%-30% (volume) dissolves the insoluble inclusion that obtains behind the rare-earth metal wire at normal temperatures with concentration.This rare-earth metal wire of the equal solubilized of the hydrochloric acid soln of different concns and obtain described insoluble inclusion, but used concentration of hydrochloric acid solution is low excessively, as be lower than 20% (volume), then dissolution time is long; And this concentration of hydrochloric acid solution is too high, as is higher than 30% (volume) and then reacts too anxious strong; Therefore, preferably use the hydrochloric acid soln of 20%-30% (volume) to dissolve described rare-earth metal wire.Learning that with the insoluble inclusion that ordinary method analyses such as power spectrum and scanning electron microscope obtain this inclusion is the oxide compound by rare earth elements such as lanthanum, cerium, praseodymium, neodymiums, mainly is trivalent and slag phase, and promptly the Aluminosilicates material of calcium constitutes.Though constituting the described trivalent rare earth oxide compound of described insoluble inclusion and the Aluminosilicates slag ratio mutually of calcium forms because of raw material, the used melting equipment and the difference of processing method and some difference, but the determinative that influences the plasticity of rare-earth metal wire and intensity is the total amount of insoluble inclusion contained in this, rather than the ratio of each component in this inclusion.Find that described inclusion major part accumulates in the centre of rare-earth metal wire when observing rare-earth metal wire under metaloscope, the centre of having assembled a large amount of described inclusiones is exactly the fracture origin of rare-earth metal wire.Under the prerequisite of uncontrollable above-mentioned aggregation tendency, have only the total amount of the described inclusion of control could reduce inclusion accumulative disadvantageous effect.
The term " rare-earth metal wire " that is used for the present invention comprises the rare-earth metal wire arbitrarily that lanthanum, cerium, praseodymium, neodymium mixed rare-earth metal or the single rare earth metal by any content constitutes.
Specification sheets of the present invention hereinafter reaches the insoluble inclusion described in claims and refers in particular to the hydrochloric acid soln of using 20%-30% (volume) concentration, dissolve rare-earth metal wire at normal temperatures and obtain, the inclusion that constitutes with the silico-aluminate material of the trivalent of rare earth metal and calcium.When being the dissolve with hydrochloric acid solution rare-earth metal wire of 20%-30% (volume) with concentration, obtain deriving from the insoluble metallographic phase in the raw material sometimes, precipitate as titanium metal, but they are different with the insoluble inclusion of the defined described hydrochloric acid soln of the present invention, it does not have disadvantageous effect to plasticity, the intensity of rare-earth metal wire, and these metallographic phase are easy to differentiate with metaloscope.The present invention does not do any qualification to the shape of cross section and the size of described rare-earth metal wire.
Non-specializing, per-cent hereinafter all is weight percentage.
Rare-earth metal wire provided by the present invention is wherein said, and the described inclusion content of hydrochloric acid soln that is insoluble to 20%-30% (volume) concentration at normal temperatures is less than the rare-earth metal wire of 0.2% (weight).Described inclusion is the inclusion that the Aluminosilicates material of the trivalent of rare earth element and calcium constitutes.
During inclusion content＞0.2% (weight) described in the alkene earth metals line, plasticity, the intensity of rare-earth metal wire are relatively poor.
The preparation technology of rare-earth metal wire of the present invention is as follows:
Composition requirement by the user is prepared burden with rare earth metal, melts in induction furnace then.Behind the metal fine melt, the molten metal temperature is risen to 1015-1100 ℃, had a power failure calm 1-3 minute, be cast into ingot then.
The rare earth metal that employing contains the following described inclusion of 0.15% (weight) is prepared burden.
After the molten metal temperature rises to 1050-1100 ℃, molten metal is stirred, preferably this molten metal is blown Ar by the molybdenum pipe, further specify the present invention below by embodiment.
Embodiment 1: press the specification requirement of La, Ce, Pr, Nd, prepare burden with rare-earth metal material, the total content of the described inclusion in the rare earth metal of allocating into is 0.05% (weight), confected materials is placed in the intermediate frequency furnace that capacity is 15kg carries out melting.Described intermediate frequency furnace adopts plumbago crucible.
When the metal fine melt and after reaching 1100 ℃, blew Ar2 minute by the molybdenum pipe, and then calm 1 minute, this molten metal being cast diameter at last is Φ 56mm, the ingot of substance 2kg;
The ingot of gained is squeezed into the silk of Φ 2mm with AY-32-315 four-column type universal hydraulic machine.In the silk pressing process, there is not the broken string phenomenon.
Detect:
1, this Chemical Composition is as follows:
(La+Ce+Pr+Nd)=98% (weight), Ce=49% (weight) wherein, other other rare earth element and impurity for not doing to require.
2, analyze the sample of 5 different sites taking from above-mentioned silk, with the hydrochloric acid of 20% (volume), in dissolved this sample of separating, after filtration, washing, drying, calcination weigh, the mean value of the weight of the described inclusion of gained is 0.008% (weight).
3, this sample alternating bending number of times mean value of taking from 5 different sites is 46 times.
Kang draws Qiang Du Zhuo＞120MPa
Embodiment 2
Press the specification requirement of La, Ce, Pr, Nd, prepare burden with rare earth metal, the total content of the described inclusion in the rare earth metal of allocating into is 0.14% (weight), with confected materials by embodiment 1 identical method carry out melting, ingot casting, be squeezed into Φ 2.8mm the silk.
Detect:
1, this Chemical Composition is as follows:
(La+Ce+Pr+Nd+)=98.5% (weight), La=42% (weight) wherein, other other rare earth element and impurity for not doing to require.
2, analyze the sample of 5 different sites taking from above-mentioned silk, adopt embodiment 1 identical analytical procedure to record average content=0.12% (weight) of wherein said insoluble inclusion.
3, the number of bends mean value of above-mentioned silk is 22 times, tensile strength＞120MPa.
Embodiment 3: adopt the lanthanoid metal raw material that contains the described inclusion of 0.012% (weight), prepare burden by the technical requirements of lanthanum content=99.0% (weight) in the rare-earth metal wire.With identical with embodiment 1, but the processing step that does not blow Ar obtains the silk of Φ 2.5mm.
Detect:
1, this silk contains lanthanum amount=99.0% (weight)
2, analyze the sample of 5 different sites taking from above-mentioned silk, adopt embodiment 1 identical analytical procedure to record average content=0.013% (weight) of wherein said insoluble inclusion.
3, the number of bends mean value of above-mentioned silk is 32 times, tensile strength＞120Mpa.
Claims (2)
1. a rare-earth metal wire is characterized in that in this rare-earth metal wire, and the content of inclusion of hydrochloric acid acid solution that is not deeper than 2O%-30% (volume) concentration at normal temperatures is for below 0.2% (weight) of this rare-earth metal wire gross weight.
2. rare-earth metal wire as claimed in claim 1 is characterized in that wherein said inclusion is made of the trivalent of rare earth element and the Aluminosilicates material of calcium.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN00115903A CN1098365C (en) | 2000-07-17 | 2000-07-17 | Rare-earth metal wire |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN00115903A CN1098365C (en) | 2000-07-17 | 2000-07-17 | Rare-earth metal wire |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1334355A CN1334355A (en) | 2002-02-06 |
| CN1098365C true CN1098365C (en) | 2003-01-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN00115903A Ceased CN1098365C (en) | 2000-07-17 | 2000-07-17 | Rare-earth metal wire |
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| Country | Link |
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| CN (1) | CN1098365C (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100381596C (en) * | 2003-03-19 | 2008-04-16 | 钢铁研究总院 | Method for producing rare-earth metal screw-rod |
| CN104561803B (en) * | 2015-02-10 | 2016-09-21 | 苏州科胜仓储物流设备有限公司 | A kind of high intensity shelf back of the body net aluminum bag process wiry technique |
| CN108296304A (en) * | 2018-02-01 | 2018-07-20 | 包头稀土研究院 | The manufacturing method of minor diameter La/Ce/Pr/Eu rare earth metal silk materials |
| CN108326071A (en) * | 2018-02-01 | 2018-07-27 | 包头稀土研究院 | The manufacturing method of minor diameter Gd/Dy/Tb rare earth metal silk materials |
| CN108326070A (en) * | 2018-02-01 | 2018-07-27 | 包头稀土研究院 | The manufacturing method of minor diameter Ho/Er rare earth metal silk materials |
| CN108296401A (en) * | 2018-02-01 | 2018-07-20 | 包头稀土研究院 | The manufacturing method of minor diameter Nd/Sm rare earth metal silk materials |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1099426A (en) * | 1994-08-09 | 1995-03-01 | 湖北省结晶硅厂 | Plasticity and toughness improved rare earth alloy and method for improving plasticity and toughness of rare earth alloy |
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2000
- 2000-07-17 CN CN00115903A patent/CN1098365C/en not_active Ceased
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1099426A (en) * | 1994-08-09 | 1995-03-01 | 湖北省结晶硅厂 | Plasticity and toughness improved rare earth alloy and method for improving plasticity and toughness of rare earth alloy |
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| CN1334355A (en) | 2002-02-06 |
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