公开(公告)号：US4555264A

公开(公告)日：1985-11-26

申请号：US411552

申请日：1982-08-25

申请人： Takeaki Takeshita ,  Katuyuki Oba ,  Yoshiaki Shimoyama ,  Takashi Masuda

发明人： Takeaki Takeshita ,  Katuyuki Oba ,  Yoshiaki Shimoyama ,  Takashi Masuda

IPC分类号： B22D11/11 ,  C21C7/10 ,  C21C7/06

CPC分类号： B22D11/11 ,  C21C7/10

摘要： The present invention relates to a process for producing an electrical steel sheet. In order to prevent aging deterioration of the electrical steel sheet, the carbon content of the steel for the sheet should be reduced to an extremely low level, e.g., 0.0030% or less. However, when molten steel was subjected to vacuum-degassing and continuous-casting procedures to prepare steel for a electrical steel sheet in a prior art, although a desired carbon content of the molten steel was ensured at the degassing stage, the carbon content of the steel sometimes exceeded the desired level at the slab range. In the present invention, the prior art problem is solved by carrying out the degassing procedure under conditions in which the ultimate degree of vacuum in the degassing vessel is 1.0 mmHg or less, the rate of inert gas blown per gas-blowing orifice is from 30 to 150 Nl/min, and the final carbon content of the molten steel is 0.0030% or less and by using means contacting the melt during the continuous-casting procedure, the carbon content of said means being 3.0% or less.

摘要翻译： 本发明涉及电工钢板的制造方法。 为了防止电工钢板的老化劣化，应将钢板的碳含量降低至非常低的水平，例如0.0030％以下。 然而，在现有技术中，当钢水进行真空脱气和连续铸造处理以制备电工钢板时，尽管在脱气阶段确保了所需钢水的碳含量， 钢板有时在板坯范围内超出了所需的水平。 在本发明中，现有技术的问题是通过在脱气容器的最终真空度为1.0mmHg以下的条件下进行脱气处理而得到的，每个吹气孔的惰性气体的吹入速率为30 至150Nl / min，钢水的最终碳含量为0.0030％以下，通过在连续铸造工序中与熔体接触的方式，所述装置的碳含量为3.0％以下。