Nitrogen can deteriorate intergranular corrosion

low temperature impact toughness

notch sensitivity and soldering properties of low carbon 400 series stainless steel. Therefore

reducing the nitrogen content under the premise of low consumption and high efficiency has become an important issue in AOD smelting. Combined the production test

by exploring the application of regression analysis in the control of argon-denitrification process and combined with the thermodynamic calculation of denitrification to analyze the production data of AOD

it is determined by the fitting equation that the switching point of nitrogen to argon is at blowing nitrogen 450 m

3

the normal blowing argon amount of 410S stainless steel in AOD is controlled at 1550m

3

and the blowing argon amount of low carbon 430 stainless steel in AOD is generally con¬trolled a

t 2050m

3

to get controlled [N

]

below 0.0090% and reduce of argon consumption.