Nickel-chromium series high-resistance electrothermal alloy and preparation method thereof

An electrothermal alloy, high-resistance technology, used in metal rolling, metal rolling, heat treatment equipment, etc., can solve the problems of poor thermal physical properties of materials, unsatisfactory mechanical properties, and increased production costs.

Active Publication Date: 2021-07-06
CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the addition of rare earth elements, the production cost increases
Moreover, although the existing nickel-chromium-based high-resistance electrothermal alloys can meet the requirements of the maximum service temperature of 1200°C, their mechanical properties at high temperatures are not ideal, the thermophysical properties of the material are slightly poor, and the service life needs to be improved.

Method used

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  • Nickel-chromium series high-resistance electrothermal alloy and preparation method thereof

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preparation example Construction

[0038] The present invention also provides a preparation method of the above-mentioned nickel-chromium series high-resistance electrothermal alloy, comprising the following steps:

[0039] a. Use the vacuum induction melting process to smelt the raw materials of nickel-chromium series high-resistance electrothermal alloys. The vacuum degree of smelting is less than 1.0Pa. Melt at 1500-1530°C for 30-50min, and cast into electrode rods with a diameter of 200-240mm;

[0040] b. The electrode rod is smelted by electroslag remelting process, the smelting current is 6000-8000A, the smelting voltage is 50-60V, and the electroslag ingot with a diameter of 320-360mm is obtained;

[0041] c. Heat the electroslag ingot to 1170°C~1190°C, keep it warm for 3~4h, start forging temperature ≥1080°C, final forging temperature ≥900°C, forge a billet of 140×140~150×150mm, and air cool ;

[0042] d. Carry out continuous rolling of the billet. During the continuous rolling process, the steel bille...

Embodiment 1

[0048] The chemical composition of the nickel-chromium series high-resistance electric heating alloy in this embodiment is calculated by mass percentage: C 0.025%, Si 1.30%, Mn 0.10%, P 0.005%, S 0.001%, Al 0.45%, Fe 0.32%, Cr 20.7 %, W 0.13%, Co 0.48%, Zr 0.11%, and the balance is Ni and unavoidable impurities.

[0049] The preparation method of the nickel-chromium series high-resistance electrothermal alloy of this embodiment:

[0050] a. Dosing according to the weight percentage of the alloy composition in Example 1, put the raw materials into a vacuum induction furnace for smelting, the vacuum degree is less than 1.0Pa, smelting at 1510°C for 45min, and pouring into an electrode rod with a diameter of 240mm;

[0051] b. The electrode rod is smelted by the electroslag remelting process, the smelting current is 6000-8000A, the smelting voltage is 50-60V, and an electroslag ingot with a diameter of 360mm is obtained;

[0052] c. Heat the electroslag ingot to 1180°C, keep it ...

Embodiment 2

[0057] The chemical composition of the nickel-chromium series high-resistance electric heating alloy in this embodiment is calculated by mass percentage: C 0.020%, Si 1.25%, Mn 0.010%, P 0.002%, S 0.001%, Al 0.42%, Fe 0.34%, Cr 20.5% %, W 0.20%, Co 0.31%, Zr 0.23%, and the balance is Ni and unavoidable impurities.

[0058] The preparation method of the nickel-chromium series high-resistance electrothermal alloy of this embodiment:

[0059] a. Dosing according to the weight percentage of the alloy composition in Example 2, put the raw materials into a vacuum induction furnace for melting, the vacuum degree <1.0Pa, melt at 1530° C. for 30 minutes, and pour into an electrode rod with a diameter of 240 mm;

[0060] b. The electrode rod is smelted by the electroslag remelting process, the smelting current is 6000-8000A, the smelting voltage is 50-60V, and the electroslag ingot with a diameter of Φ360mm is obtained;

[0061] c. Heat the electroslag ingot to 1190°C, keep it warm for...

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Abstract

The invention belongs to the technical field of nickel-chromium high-resistance electrothermal alloys, and particularly relates to a nickel-chromium high-resistance electrothermal alloy and a preparation method thereof. The technical problem to be solved is to provide the nickel-chromium series high-resistance electrothermal alloy which is long in service life and excellent in mechanical property under a high-temperature condition and the preparation method of the nickel-chromium series high-resistance electrothermal alloy. The nickel-chromium series high-resistance electrothermal alloy comprises the following chemical components including, by weight, less than or equal to 0.08% of C, 0.75%-1.60% of Si, less than or equal to 0.50% of Al, 20.0%-23.0% of Cr, less than or equal to 0.6% of Mn, less than or equal to 1.0% of Fe, less than or equal to 0.020% of P, less than or equal to 0.015% of S, 0.10%-0.30% of W, 0.20%-0.50% of Co, 0.10%-0.25% of Zr and the balance Ni and inevitable impurities. The nickel-chromium series high-resistance electrothermal alloy is small in expansion coefficient, good in resistance uniformity and long in service life.

Description

technical field [0001] The invention belongs to the technical field of nickel-chromium high-resistance electrothermal alloys, in particular to a nickel-chromium series high-resistance electrothermal alloy and a preparation method thereof. Background technique [0002] Electrothermal alloy is a functional electrothermal engineering alloy material that uses the resistance of the material to generate Joule heat to convert electrical energy into heat energy. It is widely used in electrothermal elements in the fields of metallurgy, machinery, petrochemical, electrical, construction, and home appliances. According to the chemical composition, electrothermal alloys are mainly divided into three categories: Ni-Cr system, Ni-Cr-Fe system and Fe-Cr-Al system alloy. [0003] Cr20Ni80 is widely used in household appliances and metallurgical industries because of its stable single-phase austenite structure, high melting point, stable resistivity, low thermal expansion coefficient, long s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C19/05C22C1/02C22F1/10C21D9/52B21B1/46B21B37/00B21B37/74
CPCC22C19/055C22C1/023C22F1/10C21D9/525B21B1/463B21B37/74B21B37/00B21B2201/06
Inventor 肖东平武雪婷张军尹凤先
Owner CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD
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