Chromium-iron-aluminum alloy with surface rich in aluminum

A technology of iron-chromium-aluminum alloy and aluminum alloy, which is applied in the field of chromium-iron-aluminum alloy, can solve problems such as reduction in alloy quality and hardness, poor application of iron-chromium-aluminum alloy, and poor machining performance, so as to achieve the reduction and improvement of machining performance Use temperature, practical life, and effect of increased anti-oxidation performance

Inactive Publication Date: 2018-07-27
YANCHENG XINYANG ELECTROTHERMAL MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The existing iron-chromium-aluminum alloy is difficult to meet the iron-chromium-aluminum alloy index required by the industry. Excessively high aluminum content will reduce the quality and hardness of the alloy, and the machining performance will deteriorate, which will cause very bad problems in the application of iron-chromium-aluminum alloy. influences

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Use industrial pure iron with a mass fraction of 75%, 10% metallic chromium, and 15% aluminum nitride powder as raw materials, and put all industrial pure iron, metallic chromium, and 1 / 3 of the aluminum nitride powder into First smelting in an intermediate frequency induction furnace, the temperature is controlled at 1800°C, the slag is removed after smelting, and 1 / 3 of the aluminum nitride powder is added to the molten steel after slag removal for the second smelting, the temperature is controlled at 2000°C, and the smelting After casting into iron-chromium-aluminum alloy ingots, the iron-chromium-aluminum alloy ingots are embedded in the remaining 1 / 3 aluminum nitride powder and put into a vacuum induction furnace for three melting times. The temperature is controlled at 2100°C and the melting time is 30 minutes. Then it is rapidly cooled to 1000° C. within 10 minutes, sintered at this temperature for 30 minutes at a constant temperature, and the iron-chromium-alumin...

Embodiment 2

[0031] Use industrial pure iron with a mass fraction of 75%, 10% metallic chromium, and 15% aluminum nitride powder as raw materials, and put all industrial pure iron, metallic chromium, and 1 / 3 of the aluminum nitride powder into First smelting in an intermediate frequency induction furnace, the temperature is controlled at 2000°C, the smelting time is 1h, the slag is removed after smelting, and 1 / 3 of the aluminum nitride powder is added to the molten steel after slag removal for the second smelting, and the temperature is controlled at 2500°C, smelting time 1h, after smelting, cast iron-chromium-aluminum alloy ingots, embed the iron-chromium-aluminum alloy ingots in the remaining 1 / 3 aluminum nitride powder, put them into a vacuum induction furnace for three melting times, and control the temperature at 2300°C, the melting time is 50min, and then rapidly cooled to 1100°C within 10min, sintered at this temperature for 50min at a constant temperature, and after cooling, an iro...

Embodiment 3

[0033] Use industrial pure iron with a mass fraction of 75%, 10% metallic chromium, and 15% aluminum nitride powder as raw materials, and put all industrial pure iron, metallic chromium, and 1 / 3 of the aluminum nitride powder into First smelting in the intermediate frequency induction furnace, the temperature is controlled at 1900 °C, the smelting time is 1h, the slag is removed after smelting, and 1 / 3 of the aluminum nitride powder is added to the molten steel after the slag removal for the second smelting, and the temperature is controlled at 2250°C, smelting time 1h, after smelting, cast iron-chromium-aluminum alloy ingots, embed the iron-chromium-aluminum alloy ingots in the remaining 1 / 3 aluminum nitride powder and put them into a vacuum induction furnace for three smelting times, controlling the temperature as 2200°C, smelting time is 40min, then rapidly cooled to 1050°C within 10min, sintered at this temperature for 40min, after cooling, FeCrAl alloy with aluminum-rich s...

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Abstract

The invention relates to a chromium-iron-aluminum alloy with the surface rich in aluminum. Raw materials of the iron-chromium-aluminum alloy are ingot iron, chromium metal and aluminum nitride powder.In the preparation process of the iron-chromium-aluminum alloy, after the ingot iron, the chromium metal and 1 / 3 of aluminum nitride powder are subjected to primary smelting in a medium-frequency induction furnace, slag is removed; 1 / 3 of aluminum nitride powder is secondarily added into molten steel obtained after slag removal for secondary smelting; after smelting, an iron-chromium-aluminum alloy ingot is obtained through casting; the iron-chromium-aluminum alloy ingot is buried in the remaining 1 / 3 of aluminum nitride powder to be placed into a vacuum induction furnace for ternary smelting; the temperature is controlled to range from 2,100 DEG C to 2,300 DEG C, and the smelting time is controlled to range from 30 min to 50 min; and then fast cooling is carried out till the temperatureranges from 1,000 DEG C to 1,100 DEG C, constant-temperature sintering is carried out for 30 min to 50 min at the temperature, and the iron-chromium-aluminum alloy with the surface rich in aluminum isobtained after cooling. The quick life value of a wire made of an iron-chromium-aluminum alloy material high in aluminum content ranges from 150 h to 200 h at the temperature being 1,300 DEG C, the service life is long, and application of the iron-chromium-aluminum alloy can meet the requirements of special industries.

Description

technical field [0001] The invention relates to the field of chromium-iron-aluminum alloys, in particular to a chromium-iron-aluminum alloy whose surface is rich in aluminum. Background technique [0002] The iron-chromium-aluminum electric heating alloy has high resistivity, light specific gravity, strong anti-oxidation and anti-carburization ability, good corrosion resistance to sulfur and various hydrocarbon gases, and low price. The service temperature can reach 1100-1300 ℃. According to the provisions of GB / T1234-2012 high-resistance electrothermal alloys, the rapid life value of iron-chromium-aluminum alloy wire at a test temperature of 1300°C is not less than 80h. As the requirements for heat-resistant materials and heat-resistant structures are getting higher and higher, the required materials need to withstand higher and higher temperatures, and higher requirements are put forward for the high-temperature oxidation resistance and corrosion resistance of superalloys....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C30/00C22C38/06C22C38/18C22C33/04
CPCC22C30/00C22C33/04C22C38/001C22C38/06C22C38/18
Inventor 郭乃林郭健郭小芳
Owner YANCHENG XINYANG ELECTROTHERMAL MATERIAL CO LTD
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