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Preparation method of high-resistance electrothermal alloy wire

An electrothermal alloy and high resistance technology, applied in heat treatment equipment, heat treatment process control, heat treatment furnace, etc., can solve the problems of nickel-chromium alloys with weak high-temperature oxidation resistance, short service life, and low mechanical strength, and achieve high mechanical strength, Improved high-temperature oxidation resistance and less residual impurities

Inactive Publication Date: 2015-05-20
DANYANG ZHISHENG ALLOY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002]The high-resistance electrothermal alloy wire mainly has the advantages of good high-temperature oxidation resistance, high mechanical strength under high temperature conditions, and long service life. The rare elements in the alloy can improve the high-temperature oxidation resistance, service temperature and service life of the alloy. It is widely used in heating elements and general resistance elements of household electric appliances, industrial and experimental electric furnaces, and the application number is CN201010205815.5. A nickel-chromium high-resistance electric heating alloy, the chemical composition and mass percentage are: C: 0.02-0.06, P: 0.01-0.02, S: 0.010-0.015, Mn: 0.02-0.06, Si: 1.00-1.50, C r: 20.0-20.3.0, Al: 0.10-0.20, Fe: 0.4-0.8, Ti: 0.1-0.20, Zr: 0.20-0.50, RE: 0.01-0.05, Ni is the balance, the invention is due to the metal alloy Metal zirconium and rare earth materials are added, and zirconium contacts with air to form a zirconia protective layer, which greatly improves the oxidation resistance of the surface. However, this kind of nickel-chromium alloy has weak high-temperature oxidation resistance and low mechanical strength under high temperature conditions. short life

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] (1) Preparation of billet: Select nickel-chromium alloy block and put it into a rolling mill to form a wire rod with a diameter of 5mm. The chemical composition of the nickel-chromium alloy is C: 0.03, Mn: 0.49, S: 0.01, P: 0.08, Si: 0.16, Cr: 20.07, Al: 0.20, Fe: 0.38, Ti: 0.15, Nd: 0.30, the rest is Ni;

[0016] (2) Annealing treatment: Put the nickel-chromium alloy wire rolled in step (1) into a 6m-long continuous furnace, and pass ammonia gas into the furnace as a protective gas, control the temperature in the furnace to 991°C, and control the heat preservation The time is 1.8min, and then the nickel-chromium alloy wire is cooled by a pipe with a length of 8m immersed in a water tank;

[0017] (3) Alkali cleaning: Put the nickel-chromium alloy wire after heat treatment in step (2) into the mixed solution of potassium hydroxide and potassium nitrate for alkaline cleaning, control the temperature of alkaline cleaning to 580°C, and control the alkaline cleaning time to...

Embodiment 2

[0020] Example 2: The rest is the same as Example 1, except that in the step (2), the temperature in the furnace is controlled to be 1000°C, and the holding time is controlled to be 2.5 minutes; in the step (3), the temperature of the alkali washing is controlled The temperature is 600°C, and the alkali washing time is controlled to be 59 minutes.

Embodiment 3

[0021] Embodiment 3: The rest is the same as in Embodiment 1, the difference is that in the step (2), the temperature in the furnace is controlled to be 1032°C, and the holding time is controlled to be 3min; in the step (3), the temperature of the alkali washing is controlled to 640°C, control the alkali washing time to 63min.

[0022] After the above process steps, the electrothermal alloy wire sample is taken out to be tested:

[0023] serial number Antioxidant Resistivity / Elongation / % Fast life / h Pass rate / % Example 1 excellent 1.05 28.3 181 99 Example 2 excellent 1.06 27.2 182 98 Example 3 excellent 1.08 27.5 178 98

[0024] It can be seen from the above data that the prepared electrothermal alloy wire has good oxidation resistance and elongation, and the resistivity reaches 1.0 Above, the resistivity is high, after the rapid life test, it is basically more than 175h, the service life is long, the pass rate has ...

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Abstract

The invention discloses a preparation method of a high-resistance electrothermal alloy wire, and relates to the iron chromium aluminum alloy processing and manufacturing field. The preparation method includes five technological processes of blank preparation, annealing treatment, alkali washing, cleaning and wiredrawing treatment; in the annealing treatment process in the preparation method, through strict control of the heating temperature and the holding time of a box type resistance furnace, the internal organization of a nickel-chromium alloy wire is improved, the plasticity is increased, and the subsequent drawing technology is facilitated; in the alkali washing process, through well control of the temperature and time of alkali washing, an oxidation film of the surface of the nickel-chromium alloy wire is removed relatively thoroughly, the impurity residual amount is precious little, and the surface is smooth; and the nickel-chromium alloy wire prepared by the preparation method has high-temperature oxidation resistance greatly improved, has the advantages of high electrical resistivity, high mechanical strength under high temperature conditions, long service life, simple production process, and easy realized automation production.

Description

technical field [0001] The invention relates to the field of processing and manufacturing iron-chromium-aluminum alloys, in particular to a method for preparing high-resistance electrothermal alloy wires. Background technique [0002] High-resistance electrothermal alloy wire mainly has the advantages of good high-temperature oxidation resistance, high mechanical strength and long service life under high-temperature conditions. Temperature and service life, it is widely used in heating elements and general resistance elements of household electric appliances, industrial and experimental electric furnaces, the application number is CN201010205815.5 discloses a nickel-chromium high-resistance electric heating alloy, chemical composition and mass percentage For: C: 0.02-0.06, P: 0.01-0.02, S: 0.010-0.015, Mn: 0.02-0.06, Si: 1.00-1.50, C r: 20.0-20.3.0, Al: 0.10-0.20, Fe : 0.4-0.8, Ti: 0.1-0.20, Zr: 0.20-0.50, RE: 0.01-0.05, Ni is the balance, this invention adds metal zirconiu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C19/05C22F1/10C21D1/26C21D1/74C21D9/56C21D11/00C23G1/20B21C1/00
CPCY02P10/20
Inventor 王良玉张坚刘浩方
Owner DANYANG ZHISHENG ALLOY
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