Deoxidation Equilibrium of Chromium Stainless Steel with Si at the Temperatures from 1823 to 1923 K

The deoxidation equilibrium of chromium stainless steel with silicon was studied up to 25 mass% chromium at the temperatures of 1823, 1873 and 1923 K, in order to clarify the effect of chromium on silicon de-oxidation of liquid iron-chromium alloys. Results obtained were summarized as follows SiO sub 2 (s) = Si +2O, log K sub Si (=a sub Si a sub O exp 2 /a sub SiO2 ) = -24600/T + 8.40, logf sub Si exp Cr = -0.021[%Cr] + 4.3 x 10 exp -4 [%Cr] exp 2 , [mass% Cr] < =, 1823 < = T < = 1923 K. The phase stability diagrams of Si-Al complex deoxidation was estimated at [mass% Cr] = 0, 13, 20 and 1823 K, by applying present results and recent data assessed by one of authors for Cr- and Al-deoxidation equilibria in liquid iron.