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High-resistant chromium-nickel electric heating alloy and preparation process thereof

An electrothermal alloy and preparation process technology, applied in the field of nickel-chromium alloys, can solve the problems of lower lasting strength and service life than nickel-chromium electrothermal alloys, lower resistivity than iron-chromium-aluminum electrothermal alloys, unweldability, etc., and achieve excellent resistance to corrosion. Oxidation properties, increased lasting strength and service life, increased plasticity

Inactive Publication Date: 2015-07-22
JIANGSU XINHUA ALLOY ELECTRIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Electrothermal alloys are divided into two categories: nickel-chromium series electric heating alloys and iron-chromium-aluminum series electric heating alloys. These two series of electric heating alloys have different advantages and disadvantages due to different structures: nickel-chromium series electric heating alloys are single-phase austenitic structures, and their advantages It is stable without phase transition at high temperature, high high temperature strength, good plasticity, good formability, good oxidation resistance, high durable strength and high temperature service life, the disadvantage is that the resistivity is not as good as the iron-chromium-aluminum electric heating alloy; iron-chromium The aluminum-based electric heating alloy has a single-phase ferrite structure. Its advantages are that it can be used in an environment of ultra-high temperature above 1100°C, has higher resistivity, and good oxidation resistance. The disadvantages are poor plasticity, difficulty in forming, and non-weldability. Durable strength and service life are not as good as nickel-chromium heating alloys

Method used

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  • High-resistant chromium-nickel electric heating alloy and preparation process thereof
  • High-resistant chromium-nickel electric heating alloy and preparation process thereof
  • High-resistant chromium-nickel electric heating alloy and preparation process thereof

Examples

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preparation example Construction

[0040] The preparation process of the above-mentioned high-resistance electric heating alloy, its specific steps are as follows:

[0041] A. Firstly design ingredients according to the above;

[0042] B. Vacuum induction furnace smelting;

[0043] C. Forging;

[0044] D. Hot rolling;

[0045] E. The wire rod is annealed and pickled;

[0046] F, multi-pass: drawing-annealing-drawing;

[0047] G. Drawing is carried out by bicycle.

[0048] In the present invention, the refining temperature of step B is 1460-1500°C; refining time: more than 30 minutes, and the tapping temperature is 1500-1520°C. After the B step is completed, before the C step starts, the grinding process is carried out.

[0049] After the forging in step C is completed, ultrasonic testing is carried out before the hot rolling in step D starts. In step C, the forging start temperature is 1110°C-1130°C, and the final forging temperature is ≥960°C.

[0050] For step D, the hot rolling temperature is 1130°C-...

Embodiment

[0062] By adopting the three-level orthogonal table L 9 (3 4 )design experiment:

[0063] (1) Effect of Al, Si, Cr content on material resistivity

[0064] According to the existing experience and the description in the electrothermal alloy manual, the content of Al, Si, and Cr can directly affect the resistivity of the material. According to the upper and lower line principles of element design, three groups of variables of these three factors are used for implementation research. The detailed process is described in Table 1.

[0065]

[0066] Table 1 Effect of Al, Si, Cr content on resistivity

[0067] The preparation process of the above nine groups of embodiments is as follows: select pure metal materials with Ni, Cr, Mn, Fe, Si, Al, Ti, Zr content greater than 99% as raw materials for production, and control the rest of the elements in proportion.

[0068] (2) Material preparation

[0069] According to the five groups of embodiments of the present invention, th...

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Abstract

The invention discloses a high-resistant chromium-nickel electric heating alloy and a preparation process thereof. The chemical formula of the high-resistant chromium-nickel electric heating alloy is Cr20Ni80Al; the raw material formula of the high-resistant chromium-nickel electric heating alloy comprises the following components in percentage by weight: less than or equal to 0.03 percent of C, 1.40 to 1.60 percent of Si, less than or equal to 0.30 to 0.50 percent of Mn, less than or equal to 0.020 percent of P, less than or equal to 0.015 percent of S, 20.5 to 21.50 percent of Cr, less than or equal to 0.10 percent of Ti, less than or equal to 3.5 to 3.7 percent of AL, less than or equal to 1.00 percent of Fe, less than or equal to 0.2 percent of Zr, and the balance of Ni and inevitable impurities. According to the high-resistant chromium-nickel electric heating alloy, the electrical resistivity of the electric heating alloy is improved; the electrical characteristics are better; the anti-oxidation performance of an alloy material is improved; the high-temperature strength of the alloy is improved; the service life of the alloy is prolonged.

Description

technical field [0001] The invention relates to the technical field of nickel-chromium alloys, in particular to a high-resistance chromium-nickel electric heating alloy and a preparation process thereof. Background technique [0002] Electrothermal alloys are divided into two categories: nickel-chromium series electric heating alloys and iron-chromium-aluminum series electric heating alloys. These two series of electric heating alloys have different advantages and disadvantages due to different structures: nickel-chromium series electric heating alloys are single-phase austenitic structures, and their advantages It is stable without phase transition at high temperature, high high temperature strength, good plasticity, good formability, good oxidation resistance, high durable strength and high temperature service life, the disadvantage is that the resistivity is not as good as the iron-chromium-aluminum electric heating alloy; iron-chromium The aluminum-based electric heating...

Claims

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Application Information

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IPC IPC(8): C22C19/05C22F1/10
Inventor 华大凤刘威
Owner JIANGSU XINHUA ALLOY ELECTRIC
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