Interactions of a mild steel with liquid aluminium alloys have been studied in a pressure range of 0.1 to 350 MPa, and a temperature range from solid us to 750 degrees C, close to the squeeze casting process conditions. After having carried out the synthesis of previous surveys at atmospheric pressure, the influence of dipping parameters, and especially pressure, along with alloying elements on the intermetallic layer formation and on the mechanical strength of samples have been considered. These results must contribute to the improvement of the processing of steel reinforced aluminium matrix composites by squeeze casting process.