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Low-resistivity steel and manufacturing method thereof

A low-resistivity, manufacturing-method technology, applied in the field of steel and its manufacturing, can solve problems such as not being fully suitable for cathode electrodes, and achieve the effects of low manufacturing costs, low resistivity, and low expansion coefficient

Active Publication Date: 2014-06-18
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The resistivity of Q195 and Q235 at room temperature is about 15×10 -8 Ω·m, but at 900°C, its resistivity will be greater than 120×10 -8 Ω m, therefore, they are not entirely suitable as cathode electrodes working under high temperature conditions

Method used

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  • Low-resistivity steel and manufacturing method thereof
  • Low-resistivity steel and manufacturing method thereof
  • Low-resistivity steel and manufacturing method thereof

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Embodiment A1-A9 and comparative example B1-B3

[0043] Manufacture the low-resistivity steel of the present invention according to the following steps, which comprises:

[0044] (1) Smelting and vacuum degassing treatment: try not to add scrap steel or add a small amount of scrap steel during smelting, and mainly use molten iron for smelting to avoid scrap steel being brought into Cr, Ni, Mo, Ge, Se, Sn, Te, As and Sb and other harmful elements, the main purpose of smelting is to decarburize and remove harmful gases in steel, add necessary alloy elements, reduce the content of harmful elements, and control the quality and percentage distribution of chemical elements in steel as shown in Table 1;

[0045] (2) Slab: continuous casting into slab;

[0046] (3) Hot rolling: The heating temperature is 1100-1250°C, and the final rolling temperature is 750-950°C. When heating, there must be sufficient heating and holding time to ensure the homogeneity of the structure in the steel, and a higher rolling temperature is adopted. The ai...

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Abstract

The invention discloses a low-resistivity steel comprising at least one of the following chemical elements in percentage by mass: 0.001-0.010% of C, less than or equal to 0.03% of Si, 0.01-0.20% of Mn, 0.001-0.050% of Al, less than or equal to 0.010% of N, 0.001-0.015% of O, 0.001-0.05% of Nb, 0.001-0.05% of V, 0.01-2.00% of Cu and 0.001-0.05% of Ti, and the balance of Fe and other unavoidable impurities. Meanwhile, the chemical elements satisfy that 0.86*Mn+1.64*Al+4.88*O<=0.30. Accordingly, the invention also discloses a manufacturing method of the low-resistivity steel. The low-resistivity steel disclosed by the invention is low in resistivity, low in expansion coefficient and low in manufacturing cost.

Description

technical field [0001] The invention relates to a steel material and a manufacturing method thereof, in particular to a steel for electrodes and a manufacturing method thereof. Background technique [0002] In the industrial electrolysis of aluminum, it is necessary to adjust the bottom resistance and current distribution of the electrolytic tank to improve the horizontal current of the aluminum liquid. The cathode steel plate can evenly distribute the current, improve the level current of the aluminum liquid, realize low-voltage production and reduce the DC power consumption of electrolytic aluminum. Since the cathode steel plate has been in service at a high temperature of around 900°C for a long time during electrolysis of aluminum, not only is the steel plate required to have good electrical conductivity, that is, low resistivity, it is also required to have a low linear expansion coefficient and high strength. . [0003] As far as the cathode material is concerned, th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/16C22C38/14C22C38/12C22C33/04C21D8/00
Inventor 孙全社王双成张汉谦郑建忠肖桂林顾友明
Owner BAOSHAN IRON & STEEL CO LTD
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