Test of laboratory and production was done Results show that starting pressure of bottom blowing Argon was 0 30～1 00 MPa,working pressure was 0 20～0 60 MPa,time of blowing Argon was 3 minutes up 20 mm diameter rod of 20MnSi steel was produced by this process Its tensile strength was 3 72 MPa up,other mechanical performance was analogous to top blowing Argon stee

According to the process of LF refining furnance bottom blowing Argon,two methods of modeling on the base of fuzzy theory were presented.

This thesis introduces the working principle ,craftwork requirement ,modeling process ,control strategies and the realization of LF refining furnance bottom blowing Argon control system.

Mathematical simulation on blowing argon at bottom of ladle on external refining;

Practice on bottom argon bubbling for 80t ladle with single permeable bricks;

Factors influencing the hit rate of ladle bottom argon bubbling are analyzed,including the anti-molten steel permeate function of the permeable brick,the anti-flag permeate function of the permeable brick,hot earthquake of the permeable brick,the tidying up and maintenance of the brick,the piping of the bottom blow,tapping operation,argon source pressure and the temperature drop of ladle.

Because the molten steel splash seriously during the bottom argon blowing in Lianyuan Steel Company\'s 100 LF, result in the molten steel\'secondary oxidation and the wall of LF\'corrosion around the slag brick line regions.

Base on the research of LF bottom argon blowing process,the present paper analyses the origin of the difficulties of argon gas flow control and in light of the characteristics of the whole controlled system a fuzzy adaptive control system with a hierarchical structure is selected to control argon gas flow.

9% aftre bottom-side blowing argon and the effect of bottom-side blowing argon is obvious better than top blowing argon.