Influence of Vanadium and Cast Temperature on Nitrogen Solubility of Stainless Steel

Abstract

Three stainless steel grades with different vanadium content were produced in open induction furnace. The base chemical composition of investigated stainless steel has contained 18.48-18.75% Cr, 5.17-5.62% Mn, 2.47-2.58% Mo, and 6.39-6.64% Ni. The vanadium contents of the three stainless steel grades were 0.009%, 0.112%, and 0.189%. The proposed stainless steels were casted at temperatures 1753 K and 1833 K. The nitrogen contents were determined for the produced steel grades at every cast temperature. The determined nitrogen contents were compared with those calculated from the developed equation of Grigorenko and Pomarin. The influence of cast temperature and vanadium content on nitrogen solubility was investigated. Interpretation between experimental and calculated nitrogen content was carried out. Increasing vanadium content and decreasing cast temperature were found to have positive significant effect on the nitrogen solubility. There were great deviations between experimental results and those calculated by Grigorenko and Pomarin equation.

Design of New Weathering Steels through Thermodynamic Model of Nitrogen Solubility and CALPHAD

“…Thermodynamic Model for Nitrogen Solubility in Liquid. The effect of nitrogen partial pressure on activity coefficient is introduced to calculate the activity coefficient of nitrogen on the basis of previous studies [6], such as Pehlke, Elliott [7] and Chipman [8]. The thermodynamic model of nitrogen solubility in molten steel with higher interaction coefficients is as follows: 1 shows the nitrogen interaction coefficient of main alloying elements in pure iron at temperature of 1873 K.…”