Method for prolonging service life of nickel-chromium electrothermal alloy
An electrothermal alloy and nickel-chromium technology, which is used in the field of improving the service life of nickel-chromium electrothermal alloys, can solve the problems of increased brittleness of the alloy, splitting the matrix, affecting the service life of the product, etc. effect of life
Active Publication Date: 2014-07-23
YANCHENG XINYANG ELECTROTHERMAL MATERIAL CO LTD
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Problems solved by technology
As we all know, the service temperature range of nickel-chromium series electric heating alloy is a uniform austenite structure, no phase transformation occurs from room temperature to high temperature, but after long-term high-temperature service, the alloy grain size becomes larger, and many different types of alloys appear in the matrix. Types of precipitates, severely split the matrix, and enhance the brittleness of the alloy, seriously affecting the service life of the product
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Embodiment Construction
[0009] Further illustrate and understand the present invention through embodiment below.
[0010] Prepare the finished alloy of the embodiment according to the following method: (1) carry out batching according to the following composition: C: 0.013%, Si: 3.2%, Mn: 0.9%, Al.5%, Cr: 18.4%, Nb: 0.7%, Hf : 1.4%, V: 3.7%, Mo: 1.2%, Ti: 2%, Ce: 0.08%, La: 0.04%, B: 1%, S≤0.0001%, P≤0.0001%, the balance is nickel and not (2) Melt the above-mentioned weighed part of the pure metal under vacuum conditions at 1700 ° C, keep it warm for 1 hour after it is completely melted, and obtain a nickel-chromium-based electrothermal alloy melt after reducing slagging and adding aluminum for deoxidation, and then Mix aluminum titanium boron powder accounting for 1% of the total molten metal with the alloy melt by punching bag method, add them to the remaining alloy melt together, adjust the composition of the alloy melt after 40 minutes, finally add rare earth Ce and rare earth La, and cast into ...
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Abstract
The invention relates to a method for prolonging service life of a nickel-chromium electrothermal alloy. The preparation method comprises the following steps: proportioning, smelting, reducing for slagging, adding aluminum for deoxidation, carrying out hot rolling to obtain a coil, carrying out stress-relief annealing, rinsing, and carrying out multi-pass drawing. A ladle flushing process is utilized to mix the aluminum-titanium-boron powder and alloy melt, so that the titanium and boron elements are uniformly distributed, and the precipitated particles are small in size and large in quantity, thereby preventing the nickel-chromium grains from growth; and the plasticity of the material is obviously improved, and the service life is prolonged by more than 35%. The element composition and proportioning are optimized to effectively enhance the mechanical properties of the alloy.
Description
Technical field: [0001] The invention relates to a nickel-chromium electrothermal alloy, in particular to a method for improving the service life of the nickel-chromium electrothermal alloy. Background technique: [0002] Electrothermal alloy materials are resistance alloys that use the resistance properties of substances to manufacture heating elements. At present, the electrothermal alloy material has become an important engineering alloy material, which is suitable for machinery, metallurgy, electronics, chemical industry and other industries, and occupies an important position in the national economy. Nickel-chromium-based electric heating alloys have the advantages of uniform and stable resistivity, high oxidation resistance, high melting point, good high-temperature strength, and hot workability. They have been widely used in electrical appliances and industrial furnaces in recent years. As far as the domestic nickel-chromium series electric heating alloy products are...
Claims
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IPC IPC(8): C22C19/05C22C1/02
Inventor 郭健郭小芳郭乃林
Owner YANCHENG XINYANG ELECTROTHERMAL MATERIAL CO LTD