Electrothermal alloy material with excellent high temperature oxidation resistance and preparation method thereof

A high-temperature oxidation-resistant and electrothermal alloy technology, which is applied in the field of steel alloy materials, can solve the problems of difficult to meet operating temperature and high price, and achieve the effects of overcoming high-temperature embrittlement, improving oxidation resistance, and improving thermal strength

Active Publication Date: 2017-08-25
江苏金达电热电器有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If Ni-Cr alloy is used instead of Fe-Cr-Al alloy, the service temperature is difficult to meet; if it is replaced by refractory metal or non-metal electric heating element, the price is expensive

Method used

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  • Electrothermal alloy material with excellent high temperature oxidation resistance and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] In this embodiment, the composition and mass percentage of the electrothermal alloy material with excellent high-temperature oxidation resistance are as follows:

[0016] Cr 21.23%

[0017] Al 6.03%

[0018] Co 1.33%

[0019] Zr 0.14%

[0020] Rare earth Y 0.04%

[0021] Nb 0.43%

[0022] Mn 0.23%

[0023] Si 0.18%

[0024] C 0.016%

[0025] N 0.015%

[0026] S 0.008%

[0027] P 0.009%

[0028] Fe balance

[0029] Vacuum induction smelting is adopted, after comprehensive measurement calculation and batching smelting, casting and molding, and then hot forging, hot rolling, recrystallization heat treatment, cold rolling and cold drawing, and finally obtained Zr and rare earth Y alloy elements with excellent high temperature resistance An electrothermal alloy material with oxidation performance, its oxidation weight gain is about 6.98 mg / cm after isothermal oxidation at 1300°C for 360 hours 2 , and its oxidation weight gain curve follows a parabolic law.

Embodiment 2

[0031] In this embodiment, the electrothermal alloy material does not contain Zr and rare earth Y alloy elements, and the composition and weight percentage of the electrothermal alloy material are as follows:

[0032] Cr 21.34%

[0033] Al 5.98%

[0034] Co 1.41%

[0035] Nb 0.48%

[0036] Mn 0.21%

[0037] Si 0.19%

[0038] C 0.016%

[0039] N 0.017%

[0040] S 0.009%

[0041] P 0.007%

[0042] Fe balance

[0043] Vacuum induction smelting is adopted, after comprehensive measurement calculation and batching smelting, casting and forming, and then hot forging, hot rolling, recrystallization heat treatment, cold rolling and cold drawing, and finally the electrothermal alloy material without Zr and rare earth Y alloy elements is obtained. , its oxidation weight gain is about 12.17 mg / cm after isothermal oxidation at 1300°C for 360 hours 2 , and its oxidation weight gain curve also follows the parabolic law.

[0044] see figure 1 As shown, the oxidation weight gain of...

Embodiment 3

[0046] In this embodiment, the composition and mass percentage of the electrothermal alloy material with excellent high-temperature oxidation resistance are as follows:

[0047] Cr 22.65%

[0048] Al 5.68%

[0049] Co 0.6%

[0050] Zr 0.18%

[0051] Rare earth Y 0.04%

[0052] Nb 0.12%

[0053] Mn 0.33%

[0054] Si 0.18%

[0055] C 0.029%

[0056] N 0.015%

[0057] S 0.008%

[0058] P 0.009%

[0059] Fe balance

[0060] Vacuum induction smelting is adopted, after comprehensive measurement calculation and batching smelting, casting and molding, and then hot forging, hot rolling, recrystallization heat treatment, cold rolling and cold drawing, and finally obtained Zr and rare earth Y alloy elements with excellent high temperature resistance An electrothermal alloy material with oxidation performance, its oxidation weight gain is about 7.39 mg / cm after isothermal oxidation at 1300°C for 360 hours 2 , and its oxidation weight gain curve follows a parabolic law.

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Abstract

The invention discloses an electrothermal alloy material with excellent high-temperature oxidation resistance and a preparation method thereof. The electrothermal alloy material has the following composition and mass percentage (%): C≤0.06, Cr: 19.5‑23.5, Al: 5.5‑ 6.5, N≤0.03, Si≤0.5, Mn≤0.5, P≤0.03, S≤0.03, Co: 0.5‑2.5, Nb: 0.1‑1.0, Zr: 0.1‑0.25, Y: 0.02‑0.2, the balance is Fe and unavoidable impurities; Vacuum induction melting process is adopted, cast into shape after melting, and finally made by hot forging, hot rolling, recrystallization heat treatment, cold rolling and cold drawing. The electrothermal alloy material not only overcomes the high-temperature embrittlement of the existing Fe-Cr-Al alloy, improves the oxidation resistance, but also improves the thermal strength, enhances the high-temperature corrosion resistance, and has excellent comprehensive performance.

Description

technical field [0001] The invention belongs to the technical field of iron and steel alloy materials, and in particular relates to an electrothermal alloy material and a preparation method thereof. Background technique [0002] Fe-Cr-Al electric heating alloy belongs to ultra-high temperature electric heating alloy, because the alloy contains a large amount of chromium and aluminum elements, the alloy has excellent high temperature oxidation resistance. Fe-Cr-Al electrothermal alloy is the most widely used electrothermal alloy in my country. It has good heat resistance, high temperature oxidation resistance, large resistivity coefficient, small resistance temperature coefficient, stable power, and forms dense The Al2O3 and Cr2O3 oxide films play a good protective role and are low in price. They are mainly used to manufacture various medium and high temperature electric furnace heating elements. High resistivity can effectively convert electrical energy into thermal energy, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/30C22C33/06C21D8/00
Inventor 倪高金肖学山刘青欢
Owner 江苏金达电热电器有限公司
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