TiAlN films were deposited on ASTM A36 steel by RF reactive sputtering process using a TiAl (60/40%) target. Films were sputtered at two different relative pressures, 0,05 and 0,1, keeping constant the Argon pressure. The films were deposited on samples with different pretreatments: as received material, hardened and quenched, plasma-nitrided, and with initial coatings of Ti and TiN. Film deposition was conducted at 230°C. The TiAlN films showed composition Ti0.4Al0.6N with preferred orientation (200). The best properties of hardness, corrosion resistance, and wear resistance were observed at a relative pressure of 0,1 and best adherence at a relative pressure of 0,05. The highest was 2500 HK.