Ultra high strength tubes of 7716 alloy with an actual yield strength higher than 180 ksi (1240 MPa) were produced by a special manufacturing process. These tubes are intended for sour HPHT environments at temperatures in the range from 200 to 260 °C (400-500 °F) pressures in the range from 200 to 280 MPa (30-40 ksi) for environments containing CO2 H2S Cl- with or without elemental sulphur. They were characterized in terms of mechanical properties microstructure corrosion resistance in sour environments as severe as NACE Level VII and susceptibility to hydrogen embrittlement. Results of this test programme are herein presented and discussed.