关键词: VOD精炼, 不锈钢, 氩气, 氮气, 合金化

Abstract: According to 30 t VOD production data with the conditions of beginning [ C ]0. 50%-0. 60% and [Si] 0. 12% -0. 20% , beginning liquid temperature 1 640 -1 650 °C , and argon and nitrogen pressure respectively being 0. 8 x 10⁶ - 1.0 x 10⁶ Pa and 1.5 x 10⁶ - 1. 5 x 10⁶ Pa, the nitrogen content in stainless steels (0. 04% - 0. 06% N) at VOD beginning, decarburized by oxygen blown and after reduction and degassing by bottom blowing argon process and bottom blowing nitrogen process have been compared. Results show that after VOD bottom blowing argon refining the nitrogen content in Cr13 type and Cr17 type stainless liquid is respectively 260 x 10^-6 and 300 x 10^-6 , its nitrogen alloying effect is obvious, and in normal atmosphere with nitrogen stirring the average increasing rate of nitrogen in Cr13 type and Cr17 type stainless steel liquid ,is respectively 40 x 10^-6/min and 45 x 10^-6/min, and with increasing liquid temperature the increasing rate of nitrogen in liquid increases, and with decreasing oxygen content in VOD refining stainless steel liquid the nitrogen alloying effect by bottom blowing nitrogen could be increased.