A kind of slab continuous casting method of electric resistance alloy cr20aly
A resistance alloy and slab continuous casting technology, which is applied in the field of resistance alloy Cr20AlY slab continuous casting, can solve the problems of easy longitudinal cracks in the slab, difficult continuous casting process control, and sensitive casting temperature.
Active Publication Date: 2016-02-17
宝武特种冶金有限公司
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Problems solved by technology
[0003] Among them, the steel grade Cr20AlY is a representative steel grade of the resistance alloy FeCrAl, which contains metal zirconium, rare earth element yttrium, and high aluminum content. At the same time, it is more sensitive to casting temperature, and the slab is prone to defects such as longitudinal cracks. It is difficult to control the continuous casting process. At present, die casting is generally used for production in China.
[0004] Since this steel type is a resistance alloy with high aluminum content, there are two main problems in the continuous casting production process: Al2O3 crystallization in the crystallizer and crack sensitivity to temperature. Major domestic manufacturers have carried out a large number of continuous casting production Trial, but no longer in production due to inability to resolve these two issues
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Embodiment Construction
[0016] The slab continuous casting method of the resistance alloy Cr20AlY of the present invention comprises an electric furnace primary smelting process, a refining process and a continuous casting process in sequence, wherein the refining process is further divided into an AOD refining process (argon-oxygen compound blowing furnace refining) and a ladle furnace refining process (bottom-blown argon furnace refining), the specific process flow is:
[0017] 1. In the primary smelting process of electric arc furnace, the low phosphating of the primary molten steel is carried out in a DC electric arc furnace of 40 tons or more. By feeding alternating current and blowing oxygen (the oxygen flow rate is controlled at 20-40 cubic meters per ton of steel), and adding lime ≤ 8 kg per ton of steel during the process, the oxidizing slag flows out intermittently to melt the charged charge It becomes molten steel in the temperature range of 1600-1620°C, and reduces the residual phosphorus...
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The invention discloses a slab continuous casting method of an electric resistance alloy Cr20AlY. The method includes an electric furnace primary smelting step, an AOD refining step, a ladle furnace refining step and a continuous casting step in sequence. By adoption of an accurate degree of superheat of molten steel, a reasonable continuous casting withdrawal speed, a reasonable cooling pattern, and other control, a continuous casting slab of the electric resistance alloy Cr20AlY, which is free of surface longitudinal cracks and other defects, is produced. On the one hand, production of electric resistance alloy plates by adoption of the slab continuous casting method can replace imported goods, lead the market and fill the gap in China, and on the other hand, difficulty caused by the specific properties of the electric resistance alloy in production is overcome, thus enhancing comprehensive competitive power of enterprises, and accumulating precious production and development experience for further production of high-chromium, high-aluminum electric resistance alloy plate products, and the like.
Description
technical field [0001] The present invention relates to the production technology of electric resistance alloy, more specifically, relates to a slab continuous casting method of electric resistance alloy Cr20AlY. Background technique [0002] The resistance alloy FeCrAl steel plate is rolled and used as a strip, mainly used for electric heating and resistance elements. In recent years, it has been used to make motor vehicle exhaust purifier carriers. According to the national environmental protection policy, truck exhaust gas purification will inevitably be launched in recent years. According to estimates, the demand for resistance alloy FeCrAl strips in industries such as truck exhaust gas purifier carriers will exceed 20,000 tons. At present, domestic resistance alloy FeCrAl strips can only produce small coils of heavy narrow strips, and the production of large coils of heavy wide bands is still blank. It is necessary to develop resistance alloy FeCrAl strips. [0003] A...
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IPC IPC(8): C22C38/18C22C33/04B22D11/00
Inventor 王大智刘军占罗辉陆建生庄伟
Owner 宝武特种冶金有限公司