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 deoxidation of liquid iron–chromium alloys. Results obtained were summarized as followsSiO2(s)=Si+2Olog KSi(=aSi · aO2/aSiO2) = –24600/T+8.40log fSiCr = –0.021[%Cr]+4.3×10–4[%Cr]2, [mass%Cr]≤25, 1823≤T≤1923 KThe 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 assesed by one of authors for Cr- and Al-deoxidation equilibria in liquid iron.