CN1059713C - Ferrous aluminum based high electric resistance alloy for electric heating - Google Patents
Ferrous aluminum based high electric resistance alloy for electric heating Download PDFInfo
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- CN1059713C CN1059713C CN96116822A CN96116822A CN1059713C CN 1059713 C CN1059713 C CN 1059713C CN 96116822 A CN96116822 A CN 96116822A CN 96116822 A CN96116822 A CN 96116822A CN 1059713 C CN1059713 C CN 1059713C
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Abstract
The present invention relates to iron and aluminum base high resistance electric heating alloy which is electric heating materials with good anti-oxidation performance, high resistivity, favorable comprehensive mechanical property and low cost. The present invention is based on Fe3A1, and a small amount of Cr, Mn, W, Nb, Mo and micro amount of elements such as Ce or B, etc. The present invention has various prescriptions which totally have favorable process performance and higher resistivity and creep resistance performance, and the present invention can be used for electric heating elements of which the use temperature is lower than 1300 DEG C.
Description
The present invention is a novel high-resistance electrothermic alloy material.
At present the industrial electrical heating element that is used for below 1300 ℃ mainly adopts nichrome (as Cr20Ni80, Cr15Ni60) and Aludirome (as OCr25Al and OCr13Al6Mo2).Nichrome not only costs an arm and a leg, and when temperature during greater than 1000 ℃, its antioxidant property significantly descends.Though the Aludirome cost is lower than nichrome, when at high temperature using, because inner grain growth is easy to take place brittle failure.Therefore when use temperature during above 1000 ℃, the electrical heating element that is processed into above-mentioned two kinds of electrical heating alloyss can not satisfy the needs of Industrial products work-ing life well.
The purpose of this invention be to provide a kind ofly both had the good oxidation resistance energy, also have simultaneously high resistivity, be suitable for use as temperature electrical heating element below 1300 ℃, electrical heating alloys material cheaply.
The chemical ingredients of the electrical heating alloys of this invention is a fundamental element with Fe and Al, micro-rare earth element ce and a spot of Cr have been added, Mn or W, Mo, Nb etc., the particular content of invention is: Fe-(24-32) Al-(0.01-0.2) Ce-(1-6) a is a wherein: be a kind of element among Cr and the Mn or two kinds.
The effect of each alloying element is respectively in the above-mentioned alloy formula:
Al:Al is the main alloy element in this invention, and it and Fe form Fe
3The Al intermetallic compound.Compare this Fe with general iron-based electrical heating alloys
3The Al intermetallic compound has excellent high temperature oxidation resistance and very high resistivity.
Ce: the alloying of micro-Ce, it can improve the comprehensive mechanical property (room temperature yield strength and plasticity, hot strength and creep resisting ability) of alloy.The adding of Ce can also crystal grain thinning, thereby improves the processing characteristics of alloy.
Cr:Cr is at Fe
3Be solid solution in the Al intermetallic compound.It shows both ways the effect that improves alloy property: the one, and the resistivity of raising alloy; The 2nd, improve alloy at room temperature plasticity.
The effect of Mn:Mn is similar with Cr, but it can significantly improve the creep-resistant property of alloy.Because the price of Mn is far below Cr, thereby the electrical heating element not high to service requirements, can adds Mn and add Cr less.
Compare with present industrial electrical heating alloys commonly used, the major advantage of this invention is: 1) resistivity of the electrical heating alloys of this invention is higher than nickel chromium triangle electrical heating alloys and siderochrome aluminium electrical heating alloys.2) high temperature oxidation resistance of the electrical heating alloys of this invention is better than other electrical heating alloys.3) alloying element amounts such as the chromium that is added in the electrical heating alloys of this invention, molybdenum, niobium seldom, so cost is lower than other electrical heating alloys.
For the performance characteristics of this invention alloy is described, the performance index of some alloys have been listed in each following table.
Listed the composition of 3 kinds of alloys in the table 1, these three kinds of alloying constituents are respectively within three kinds of composition ranges of this invention regulation.
Three kinds of alloy at room temperature resistivity have been listed in the table 2.For the ease of also having listed the room temperature resistivity of OCr25Al5 and Cr20Ni80 in the comparison sheet.
Table 3 has been listed three kinds of alloys at 700 ℃, and 850 ℃, 1100 ℃, 1200 ℃ oxidation susceptibility.As seen from the table, in 700 ℃ to the 1200 ℃ temperature ranges, the electrical heating alloys of this invention all has good antioxidant property.In the contrast table the listed oxidation test result of OCr25Al5 electrical heating alloys under condition of equivalent as seen, the antioxidant property of this invention alloy is better than the OCr25Al5 electrical heating alloys.
In order further to improve the resistivity of alloy, improve the creep-resistant property of alloy, just be suitable for using down at 1100～1300 ℃, the present invention can further implement by following prescription: (1) Fe-(24-32) Al-(0.01-0.2) Ce-(0.01-0.3) Zr-(1-6) a-(0.1-2) b (2) Fe-(24-32) Al-(0.01-0.2) B-(0.01-0.3) Zr-(1-6) a-(0.1-2) b
B: be W, Mo, one or more elements among the Nb.
W:W is the part solid solution in the alloy of this invention.W has the effect of intensive crystal grain thinning.The adding of W has improved the hot strength and the creep-resistant property of alloy significantly, has improved the resistivity of alloy simultaneously.
The effect of Mo:Mo in this invention is similar with W.It is not really remarkable to the effect of improving alloy property to add Mo separately, but Mo and Nb or W use simultaneously, very effective to the high-temperature behavior of improving alloy.
Nb:Nb is not solid solution in alloy of the present invention.The form that it and Fe form compound is distributed in Fe
3In the Al matrix.Nb can improve effectively alloy creep-resistant property and the antioxidant property of use temperature alloy when surpassing 1000 ℃.
Zr:Zr also has crystal grain thinning effect consumingly.When using simultaneously, Zr and Mo or Nb can further improve the mechanical behavior under high temperature of alloy.
B: the adding of micro-B helps to improve the plasticity and the processing characteristics of alloy.
The electrical heating alloys of this invention can adopt following prepared:
1), pours into the ingot casting of circle or square-section subsequently with the alloy of the induction furnace melting composition range of the present invention in vacuum induction furnace or the general atmosphere atmosphere.
2) ingot casting was at 1000 ℃ of homogenizing annealing 8-10 hours, and it is the long rod of φ 40mm (rounded section) or 40 * 40mm (square sectional) that forge hot becomes the cross section.
3) adopt the hot rolling technology method to be processed into bar or band with forging ingot.Work that to roll temperature be 1000 ℃-1100 ℃, finishing temperature is 700 ℃, and the passage deformation quantity is less than 25%.
4) bar that is processed into for hot rolling can be drawn into silk or wire rod with cold-drawing process.Every time deformation quantity is less than 15%, whenever draw two passages after, need heating anneal, annealing temperature is 800 ℃-850 ℃, annealing time is 1 hour.
The chemical ingredients of several exemplary alloy of table 1 (at%) alloy A l Cr Mn W Mo Nb Zr B Ce Fe impurity 1 26 32 0.15 surpluses＜0.052 28 5 0.5 0.5 0.1 0.05 surplus＜0.053 26 32 0.5 0.5 0.1 0.05 surplus＜0.05
Several alloy at room temperature resistivity (Ω mm of table 2
2/ m) alloy 123 OCr25Al5 Cr20Ni80 resistivity 1.82 2.06 1.99 1.4 1.10
Oxidation test result in table 3 atmospheric environment
Test temperature oxidization time oxidation weight gain alloy ℃ hour mg/cm
21 700℃ 100 0.082 700℃ 100 0.123 700℃ 100 0.121 850 100 0.102 850 100 0.143 850 100 0.151 1100 200 0.782 1100 200 0.783 1100 200 0.80OCr25Al5 1100 200 1.371 1200 500 3.72 1200 500 4.03 1200 500 3.9OCr25Al5 1200 500 4.8
Claims (3)
- One kind have good oxidation resistance can and high resistivity, be suitable for use as the ferrous aluminum based high electric resistance alloy for electric heating of temperature at electrical heating element below 1300 ℃, be fundamental element with Fe and Al, added Cr, Mn and rare earth element ce, the prescription of alloy is:Fe-(24-32at%) Al-(0.01-0.2at%) Ce-(1-6at%) a is wherein: a is one or both among Cr and the Mn.
- One kind have good oxidation resistance can and high resistivity, be suitable for use as the ferrous aluminum based high electric resistance alloy for electric heating of temperature at electrical heating element below 1300 ℃, can also add elements such as W, Mo, Nb, alloy formula is as follows:Fe-(24-32at%) Al-(0.01-0.2at%) Ce-(0.01-0.3at%) Zr-(1-6at%) a-(0.1-2at%) b is wherein: a is one or both among Cr and the Mn,B is one or more among W, Mo, the Nb.
- 3. ferrous aluminum based high electric resistance alloy for electric heating according to claim 2 can exchange Ce for B, and alloy formula is as follows:Fe-(24-32at%) Al-(0.01-0.2at%) B-(0.01-0.3at%) Zr-(1-6at%) a-(0.1-2at%) b is wherein: a is one or both among Cr and the Mn,B is one or more among W, Mo, the Nb.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN96116822A CN1059713C (en) | 1996-01-22 | 1996-01-22 | Ferrous aluminum based high electric resistance alloy for electric heating |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN96116822A CN1059713C (en) | 1996-01-22 | 1996-01-22 | Ferrous aluminum based high electric resistance alloy for electric heating |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1155590A CN1155590A (en) | 1997-07-30 |
| CN1059713C true CN1059713C (en) | 2000-12-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN96116822A Expired - Fee Related CN1059713C (en) | 1996-01-22 | 1996-01-22 | Ferrous aluminum based high electric resistance alloy for electric heating |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101892436B (en) * | 2009-05-19 | 2011-11-23 | 朝阳力宝重工集团有限公司 | Fe-Ni-Cr-Al system electrothermal alloy and manufacturing method and application thereof |
| CN104630633B (en) * | 2013-11-07 | 2017-02-08 | 丹阳正联知识产权运营管理有限公司 | Preparation method of anti-carburizing electrothermal alloy |
| CN103725972B (en) * | 2014-01-13 | 2016-05-11 | 北京中钢控股集团有限公司 | Polynary high-resistance electrothermic alloy of low-carbon (LC) and preparation method thereof |
| CN104233065B (en) * | 2014-08-26 | 2017-08-01 | 盐城市鑫洋电热材料有限公司 | A kind of SiC reinforcement iron aluminium composite material and preparation method thereof |
| CN108468000A (en) * | 2018-07-05 | 2018-08-31 | 赵云飞 | A kind of preparation method of ferrochrome material |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1990010722A1 (en) * | 1989-03-07 | 1990-09-20 | Martin Marietta Energy Systems, Inc. | Iron aluminide alloys with improved properties for high temperature applications |
| EP0465686A1 (en) * | 1990-07-07 | 1992-01-15 | Asea Brown Boveri Ag | Oxidation- and corrosion resistant alloy for parts subjected to medium high temperatures and based on doped iron trialuminide Fe3Al |
| JPH04308065A (en) * | 1991-04-04 | 1992-10-30 | Daido Steel Co Ltd | Material having high electric resistance and production thereof |
-
1996
- 1996-01-22 CN CN96116822A patent/CN1059713C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1990010722A1 (en) * | 1989-03-07 | 1990-09-20 | Martin Marietta Energy Systems, Inc. | Iron aluminide alloys with improved properties for high temperature applications |
| EP0465686A1 (en) * | 1990-07-07 | 1992-01-15 | Asea Brown Boveri Ag | Oxidation- and corrosion resistant alloy for parts subjected to medium high temperatures and based on doped iron trialuminide Fe3Al |
| JPH04308065A (en) * | 1991-04-04 | 1992-10-30 | Daido Steel Co Ltd | Material having high electric resistance and production thereof |
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| CN1155590A (en) | 1997-07-30 |
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