This paper makes a survey over the corrosion behaviour of Super 13Cr and covers SSC susceptibility, general and local corrosion performance in slightly sour conditions. During installation of pipes for Sub Sea production/transportation entrapment of seawater may occur and during commissioning period the pipes may also be pressurised with seawater. The corrosion performance under such conditions will also be presented and discussed. Both in house data as well as literature will be discussed. Keywords: sour service, SSC, general and local corrosion, martensitic SS, seawater corrosion