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Stainless steel has numerous applications due to a good combination of properties such as corrosion and oxidation resistance, toughness, weldability and mechanical strength at high temperatures. However these properties and performance are strongly related to the microstructure and in the case of castings are mainly dependent of chemical composition and cooling rate. In this work the effect of these two factors was studied and the experimental results compared with theoretical models available in literature. Sixteen heats of different austenitic stainless steel were cast and their complete chemical compositions were determined. Most of analyzed heats showed the solidification mode type C. Ferrite values were found in the range from 0 to 11%. The influence of chemical composition on delta ferrite was strong while the influence of thickness was less accentuated. Among numerous tested formulas to estimate the quantity of delta ferrite two that demonstrated better results were the ones of Schneider and Schoefer, where the last one is recommended by ASTM A800 standard.