CN104726778A - Rare-earth La containing electrothermal alloy material having excellent high-temperature oxidation resistance - Google Patents
Rare-earth La containing electrothermal alloy material having excellent high-temperature oxidation resistance Download PDFInfo
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- CN104726778A CN104726778A CN201510131653.8A CN201510131653A CN104726778A CN 104726778 A CN104726778 A CN 104726778A CN 201510131653 A CN201510131653 A CN 201510131653A CN 104726778 A CN104726778 A CN 104726778A
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Abstract
The invention discloses a rare-earth La containing electrothermal alloy material having excellent high-temperature oxidation resistance and belongs to the technical field of steel & iron alloy materials. The rare-earth La containing electrothermal alloy material is prepared from the following components in percentage by mass: less than or equal to 0.025% of C, 19.5-21.5% of Cr, 5.5-6.5% of Al, 0.1-0.15% of Zr, less than or equal to 0.02% of N, less than or equal to 0.2% of Si, less than or equal to 0.2% of Mn, less than or equal to 0.01% of P, less than or equal to 0.01% of S, 0.01-0.035% of La and the balance of Fe and inevitable impurities. The electrothermal alloy of the components within the range has excellent high-temperature oxidation resistance and is mainly applied to electrothermal elements of a powder metallurgy sintering furnace, a high-temperature heat treatment furnace and the like working within a temperature range of 1000-1300 DEG C.
Description
Technical field
The present invention relates to a kind of electrical heating alloys material with excellent high temperature oxidation resistance containing rare earth La, belong to steel alloy material technical field.
Background technology
Fe-Cr-Al electrical heating alloys is containing 13-27wt.%Cr, 3.5-7wt.%Al, and matrix has body-centered cubic structure.Conventional Fe-Cr-Al alloy material has 0Cr23Al5,0Cr21Al6 and 0Cr27Al7Mo2 etc.Fe-Cr-Al electrical heating alloys is the most widely used electrical heating alloys of China, and it has good thermotolerance, high temperature oxidation resistance, and resistivity coefficient is comparatively large, and temperature coefficient of resistance is little, power stability, generates fine and close Al in oxidizing atmosphere
2o
3and Cr
2o
3oxide film, plays a good protection, and cheap, is mainly used to manufacture various medium and high temperature heating inset.
At present, the model that the KANTHAL company of Sweden produces is that the Fe-Cr-Al alloy use temperature of Kanthal A-1 can reach 1400 ° of C, and has very high resistivity and excellent high-temperature oxidation resistance; And the use temperature as normal in 0Cr27Al7Mo2 that China produces is at 1200-1300 ° of C, compare a certain distance in addition with same kind of products at abroad.But Fe-Cr-Al electrical heating alloys hot strength is low, easily produces creep strain, after applied at elevated temperature, grain growth is remarkable, and abnormal thick crystal grain easily causes the brittle failure of heating element.At present, during the electric stove wire of Fe-Cr-Al electrical heating alloys for the manufacture of process furnace, it is too short that the subject matter of existence is exactly work-ing life.If replace Fe-Cr-Al alloy by Ni-Cr alloy, then use temperature is difficult to meet; If replace with refractory metal or non-metal electric heating body, price is expensive again.Therefore, the development of industrial furnace, in the urgent need to developing new Fe-Cr-Al electrical heating alloys, improves its hot strength, oxidation-resistance and work-ing life.
Research and develop high-end Fe-Cr-Al electrical heating alloys of new generation can improve oxidation-resistance, high temperature life and anti-heating element brittle ability by adding rare earth element.The present invention relates to a kind of electrical heating alloys material with excellent high temperature oxidation resistance containing rare earth La, not only overcome the high-temperature embrittlement of Fe-Cr-Al alloy, improve oxidation-resistance, and heat resistance have also been obtained raising, resistance to high temperature corrosion ability strengthens, and has excellent over-all properties.Add the speed that certain La can reduce the consumption of Fe-Cr-Al Aluminum in Alloy, improve the life-span.China's rare earth resources enriches, research rare earth element alloy, particularly has very strong realistic meaning and wide application prospect by the high-temperature behavior that rare earth element improves Fe-Cr-Al electrical heating alloys.
Summary of the invention
The object of the present invention is to provide a kind of electrical heating alloys material with excellent high temperature oxidation resistance containing rare earth La.Electrical heating alloys in this composition range is mainly used in the electrical heating element of working temperature at the powder metallurgy sintering furnace, high temperature heat treatment furnace etc. of 1000-1300 ° of C.
The electrical heating alloys material with excellent high temperature oxidation resistance containing rare earth La of the present invention, there is following composition and mass percent: C≤0.025, Cr:19.5-21.5, Al:5.5-6.5, Zr:0.1-0.15, N≤0.02, Si≤0.2, Mn≤0.2, P≤0.01, S≤0.01, La:0.01-0.035, surplus is Fe and inevitable impurity.
Containing the preparation method with the electrical heating alloys material of excellent high temperature oxidation resistance of rare earth La, adopt vacuum induction melting technique, before during vacuum induction melting, in crucible, first put into pure Fe, ferrochrome and pure Zr; Then be evacuated to lower than 3Pa, then fill Ar gas; By the pure Fe in crucible, ferrochrome and pure Zr melting down after, power failure condensation 30 minutes; Treat molten steel surface conjunctiva after, open induction furnace, put into Al-La master alloy and pure Al, then vacuumize lower than 5Pa, fill Ar gas, slowly by Al-La master alloy and pure Al melting down; Cast molding after melting, then through forge hot, hot rolling, cold rolling and dynamic recrystallization treatment, can finally obtain.
The deflection of forge hot is 40%, and the deflection of hot rolling is 75%, and cold rolling deflection is 90%.
Dynamic recrystallization treatment: a 950-1050 ° C is incubated 5 minutes, air cooling.
Al adds with the form of pure Al and recovery rate calculates by 85%, and Zr adds with the form of pure Zr and recovery rate calculates by 90%, and Cr is added by the form of extra low carbon ferrochromium, and La adds with the form of Al-La master alloy.
Remove Al surface oxide layer before melting, during batching, the mass ratio of Al and La is 3:5, and during melting, low vacuum is in 5Pa, fills the melting of Ar gas.
Beneficial effect of the present invention: the steel within the scope of present component is after recrystallize process, and 1300 ° of C isothermal oxidations, 360 hours oxidation weight gains are lower than 2mg/cm
-2, the electrical heating alloys in this composition range has excellent high temperature oxidation resistance, main as the electrical heating element of working temperature at the powder metallurgy sintering furnace, high temperature heat treatment furnace etc. of 1000-1300 ° of C.
Mechanism of the present invention is as described below: add the formation that suitable earth La can promote protective oxide film, the weightening finish of low-alloyed isothermal oxidation is significantly fallen, improve oxide film resistance to flaking under isothermal conditions, improve the antioxidant property of alloy under harsh service condition; All right crystal grain thinning simultaneously, pinning crystal boundary, inhibiting grain growth, thus the speed slowing down the grain coarsening of Fe-Cr-Al electrical heating alloys high temperature, extend high temperature life.
Embodiment
After now specific embodiments of the invention being described in.
embodiment 1
In the present embodiment, adopt containing the composition with the electrical heating alloys material of excellent high temperature oxidation resistance of rare earth La and mass percent as follows:
Cr 19.83%
Al 6.23%
N 0.011%
Mn 0.08%
C 0.012%
Rare earth La 0.01%
Si 0.09%
Zr 0.13%
S 0.005%
P 0.007%
Fe surplus
Adopt vacuum induction melting processing method, after comprehensive metering calculating and batching melting, before casting, the rare earth intermediate alloy Al-La through vacuum arc furnace melting gained is directly dropped into, cast molding, through forge hot, hot rolling, cold rolling and dynamic recrystallization treatment, (1000 ° of C are incubated 5 minutes again, air cooling), the final obtained electrical heating alloys material with excellent high temperature oxidation resistance containing rare earth La, and 1300 ° of C isothermal oxidations, 360 hours oxidation weight gains are about 1.89mg/cm
-2.
embodiment 2
In the present embodiment, adopt containing the composition with the electrical heating alloys material of excellent high temperature oxidation resistance of rare earth La and weight percent as follows:
Cr 21.2%
Al 5.93%
N 0.013%
Mn 0.10%
C 0.023%
Rare earth La 0.03%
Si 0.06%
Zr 0.14%
S 0.004%
P 0.009%
Fe surplus
Adopt vacuum induction melting processing method, after comprehensive metering calculating and batching melting, before casting, the rare earth intermediate alloy Al-La through vacuum arc furnace melting gained is directly dropped into, cast molding, through forge hot, hot rolling, cold rolling and dynamic recrystallization treatment, (1000 ° of C are incubated 5 minutes again, air cooling), the final obtained electrical heating alloys material with excellent high temperature oxidation resistance containing rare earth La, and 1250 ° of C isothermal oxidations, 360 hours oxidation weight gains are about 1.67mg/cm
-2.
Such electrical heating alloys material with excellent high temperature oxidation resistance containing rare earth La is that the antioxidant property of Kanthal A-1 electrical heating alloys is similar in the model that 1250-1300 ° of C isothermal antioxidant property and KANTHAL company of Sweden are produced.Such electrical heating alloys material with excellent high temperature oxidation resistance containing rare earth La can be used as the electrical heating element of working temperature at the sintering oven, heat treatment furnace etc. of 1000-1300 ° of C.
Embodiment is just for the ease of understanding technical scheme of the present invention; do not form limiting the scope of the invention; every do not depart from technical solution of the present invention interior perhaps above scheme is done according to technical spirit of the present invention any simple modification, equivalent variations and modification, all still belong within scope.
Claims (6)
1. containing the electrical heating alloys material with excellent high temperature oxidation resistance of rare earth La, it is characterized in that there is following composition and mass percent: C≤0.025, Cr:19.5-21.5, Al:5.5-6.5, Zr:0.1-0.15, N≤0.02, Si≤0.2, Mn≤0.2, P≤0.01, S≤0.01, La:0.01-0.035, surplus is Fe and inevitable impurity.
2., according to claim 1 containing the preparation method with the electrical heating alloys material of excellent high temperature oxidation resistance of rare earth La, adopt vacuum induction melting technique, before during vacuum induction melting, in crucible, first put into pure Fe, ferrochrome and pure Zr; Then be evacuated to lower than 3Pa, then fill Ar gas; By the pure Fe in crucible, ferrochrome and pure Zr melting down after, power failure condensation 30 minutes; Treat molten steel surface conjunctiva after, open induction furnace, put into Al-La master alloy and pure Al, then vacuumize lower than 5Pa, fill Ar gas, by Al-La master alloy and pure Al melting down; Cast molding after melting, then through forge hot, hot rolling, cold rolling and dynamic recrystallization treatment.
3., according to claim 2 containing the preparation method with the electrical heating alloys material of excellent high temperature oxidation resistance of rare earth La, it is characterized in that: the deflection of forge hot is 40%, the deflection of hot rolling is 75%, and cold rolling deflection is 90%.
4., according to claim 2 containing the preparation method with the electrical heating alloys material of excellent high temperature oxidation resistance of rare earth La, it is characterized in that: dynamic recrystallization treatment: 950-1050 ° of C is incubated 5 minutes, air cooling.
5. according to claim 2,3 or 4, contain the preparation method with the electrical heating alloys material of excellent high temperature oxidation resistance of rare earth La, Al adds with the form of pure Al and recovery rate calculates by 85%, Zr adds with the form of pure Zr and recovery rate calculates by 90%, Cr is added by the form of extra low carbon ferrochromium, and La adds with the form of Al-La master alloy.
6. according to claim 5 containing the preparation method with the electrical heating alloys material of excellent high temperature oxidation resistance of rare earth La, it is characterized in that: before melting, remove Al surface oxide layer, during batching, the mass ratio of Al and La is 3:5, and during melting, low vacuum is in 5Pa, fills the melting of Ar gas.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105039858A (en) * | 2015-08-21 | 2015-11-11 | 江苏金达电热电器有限公司 | Electrothermal alloy material with excellent high-temperature resistant grain growth behavior and manufacturing method thereof |
| CN105154776A (en) * | 2015-08-21 | 2015-12-16 | 江苏金达电热电器有限公司 | Electric heating alloy material with excellent high-temperature oxidation resistance and preparing method for material |
| CN109072384A (en) * | 2016-04-22 | 2018-12-21 | 山特维克知识产权股份有限公司 | Alfer |
| CN112647012A (en) * | 2020-11-04 | 2021-04-13 | 江苏大学 | Fe-Cr-Al-Nb-Ti-RE alloy material for catalyst carrier of exhaust gas purifier and preparation method thereof |
| CN113122778A (en) * | 2021-03-31 | 2021-07-16 | 江苏大学 | High-cleanness low-brittleness Fe-Cr-Al-Y-La alloy material and preparation method thereof |
| CN113337783A (en) * | 2021-06-01 | 2021-09-03 | 钢铁研究总院淮安有限公司 | Production method of barium-cleaned iron-chromium-aluminum alloy |
-
2015
- 2015-03-25 CN CN201510131653.8A patent/CN104726778A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105039858A (en) * | 2015-08-21 | 2015-11-11 | 江苏金达电热电器有限公司 | Electrothermal alloy material with excellent high-temperature resistant grain growth behavior and manufacturing method thereof |
| CN105154776A (en) * | 2015-08-21 | 2015-12-16 | 江苏金达电热电器有限公司 | Electric heating alloy material with excellent high-temperature oxidation resistance and preparing method for material |
| CN105154776B (en) * | 2015-08-21 | 2017-08-25 | 江苏金达电热电器有限公司 | Electrothermal alloy material with excellent high temperature oxidation resistance and preparation method thereof |
| CN109072384A (en) * | 2016-04-22 | 2018-12-21 | 山特维克知识产权股份有限公司 | Alfer |
| CN112647012A (en) * | 2020-11-04 | 2021-04-13 | 江苏大学 | Fe-Cr-Al-Nb-Ti-RE alloy material for catalyst carrier of exhaust gas purifier and preparation method thereof |
| CN113122778A (en) * | 2021-03-31 | 2021-07-16 | 江苏大学 | High-cleanness low-brittleness Fe-Cr-Al-Y-La alloy material and preparation method thereof |
| CN113337783A (en) * | 2021-06-01 | 2021-09-03 | 钢铁研究总院淮安有限公司 | Production method of barium-cleaned iron-chromium-aluminum alloy |
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Application publication date: 20150624 |