Medium-high temperature resistant anti-graphitization economical electrolytic cell steel and preparation method thereof

Abstract

The invention relates to the field of engineering materials, and more particularly discloses a medium-high temperature anti-graphitization economical electrolytic cell steel and a preparation method thereof. The electrolytic cell steel comprises the following components of, by weight, less than or equal to 0.14% of C, less than or equal to 0.35% of Si + Al, less than or equal to 1.20% of Mn, lessthan or equal to 0.015% of S, less than or equal to 0.020% of P, less than or equal to 0.50% of Cr + Cu, less than or equal to 0.50% of V + Ti, and the balance Fe and impurities. According to the steel, the problems of welding seam graphitization, anti-oxidation and low lifetime during secondary maintenance of a cell shell in a high-temperature stress state of an aluminum electrolytic cell are solved, on the basis of an existing material of the aluminum electrolytic cell, the chemical components of the electrolytic cell steel are redesigned through the mutual exclusion effect of alloying elements such as the Si, the Al, the Cr and the V and the influence on high-temperature performance of a steel plate, the electrolytic cell steel has medium-high-temperature-resistant and anti-graphitization characteristics on the basis of cost control through a controlled-rolling and controlled-cooling process, and provides a low-cost high-performance special steel plate of the electrolytic cell for the electrolytic aluminum industry, a traditional aluminum electrolytic cell existing material can be replaced, and the cost is saved for the electrolytic aluminum industry.

Description

[0001] structural technology [0002] The invention belongs to the field of liquid-taking equipment, and in particular relates to a medium-high temperature-resistant and anti-graphitization economical steel for an electrolytic cell and a preparation method thereof. Background technique [0003] The steel shells and steel frames of electrolytic cells with different current intensities in the domestic electrolytic aluminum industry are all welded structural parts, and the materials used are Q235B and Q345B steel. After the channel steel shell is rectified, the refractory material can be re-roasted and used for the second time. However, under actual working conditions, the small aluminum electrolytic cell can be used for the second time, and the large-scale electrolytic cell has a large amount of deformation, tearing of the weld, and carbonization of the weld. After the steel shell is corrected, it is impossible to repair the welding again, which brings a lot of difficulties to t...

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Problems solved by technology

[0003] The steel shells and steel frames of electrolytic cells with different current intensities in the domestic electrolytic aluminum industry are all welded structural parts, and the materials used are Q235B and Q345B steel. After the channel steel shell is rectified, the refractory material can be re-roasted and used for the second time. However, under actual working conditions, the small aluminum electrolytic cell can be used for the second time, and the large-scale electrolytic cell has a large amount of deformation, tearing of the weld, and carbonization of the weld. After the steel shell is corrected, it is impossible to repair the welding again, which brings a lot of difficulties to the maintenance of the steel shell of the electrolytic tank, and even makes it impossible to repair

[0004] Especially with the green and energy-saving development of electrolytic cells in the electrolytic aluminum industry, the volume and current capacity of electrolytic cells have been enlarged, the current intensity has been upgraded from 160KA to 600KA, the current thermal effect of electrolytic cells has been continuously upgraded, the maximum working temperature has reached 400°C, and the thermal expansion load has continued to increase. Reaching 200 tons per linear meter, resulting in high-temperature oxidation and high-temperature deformation of the steel shell of the electrolytic cell, the life of the electrolytic cell is greatly reduced, and the life of the aluminum electrolytic cell in my country is generally only half of the design requirement for 500kA, and three-quarters of the design requirement for 400kA

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