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Method for producing ferrochrome nitride with microwave as heat source

A technology of ferrochromium nitride and micro-carbon ferrochromium, which is applied in the field of ferrochromium nitride production, can solve the problems of difficult control of the smelting process, poor appearance quality, long nitriding time, etc., achieve broad industrial application prospects, and short synthesis time , the effect of low synthesis temperature

Inactive Publication Date: 2011-03-30
SINOSTEEL JILIN FERROALLOYS
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Problems solved by technology

The shortcomings of the traditional method are mainly that the nitriding time is too long, the smelting temperature is high, the smelting process is not easy to control, and the appearance quality is poor. At the same time, there are disadvantages such as high smelting power consumption, high manufacturing cost, and low production efficiency.

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  • Method for producing ferrochrome nitride with microwave as heat source
  • Method for producing ferrochrome nitride with microwave as heat source

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Embodiment Construction

[0017] Now, the present invention will be further described as follows in conjunction with the accompanying drawings and specific embodiments. Lay medium-carbon ferrochrome, low-carbon ferrochrome, and micro-carbon ferrochrome particles with a particle size of ≤10mm in the push boat used in the microwave tunnel kiln, and use the push plate to continuously and automatically push the material into the microwave high-temperature microwave with a microwave frequency of 2.45GHz In the nitriding tunnel kiln, pure nitrogen with a purity of more than 99.5% is introduced. Under a nitrogen atmosphere with a pressure of 0.005-0.01MPa, preheat from the greenhouse to 900°C for 2-2.5 hours, and the microwave synthesis temperature is controlled at 900-1500°C. After 4 to 6 hours of synthesis time, the optimal nitriding heat preservation interval is 1050 to 1150 ° C. After cooling out of the kiln, the composite obtained is a finished ferrochromium nitride alloy. The nitrogen content of ferrochr...

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Abstract

The invention discloses a method for producing ferrochrome nitride with microwave as a heat source, wherein 2.45GHz microwave is used as a heat source. The method comprises the steps of: preheating medium carbon ferrochrome particles, low carbon ferrochrome particles and micro carbon ferrochrome particles, with the granularity not larger than 10mm, for 2-2.5h in an atmosphere of 0.005-0.01MPa nitrogen to raise the room temperature to 900 DEG C, then keeping the temperature to be 900-1500 DEG C for nitriding reaction and sintering densification for 4-6h, and cooling to obtain the ferrochrome nitride with the content of 3-6wt%. The microwave nitrification method for synthesizing the ferrochrome nitride favorably solves the problems of high power consumption, long smelting time, uneven material temperature field, poor product appearance quality and the like in the traditional method for smelting the ferrochrome nitride.

Description

technical field [0001] The invention relates to a method for producing ferrochrome nitride by using microwave as a heat source. Background technique [0002] The main substance in ferrochromium nitride (Fe-CrN) is chromium nitride. Chromium mainly plays the role of alloying in steelmaking. Chromium element can improve the mechanical properties of steel and make steel have special physical and chemical properties. It is an important alloying element in steel. Ferrochromium nitride is widely used in the smelting and production of stainless steel, heat-resistant steel, corrosion-resistant steel, alloy steel and other special steels. The effect of nitrogen on expanding the austenite zone is about 30 times that of nickel, which can partially replace the precious metal nickel and reduce production costs. . [0003] Nowadays, the production of traditional ferrochromium nitride is carried out in a vacuum resistance furnace, and the synthetic production is carried out by means of r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/26
Inventor 唐玉鹏刘福东孙岩铎柏森高辉高海军朱宏伟李志峰张喜瑞刘德明崔贤
Owner SINOSTEEL JILIN FERROALLOYS
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