Carbon Capture and Storage (CCS) technology which involves capturing CO2 and injecting into geological formations is seen as a focus area for reducing CO2 emissions and sustainable future. One of the key challenges for CCS is material selection for construction of wells for injection and storage where the materials can be subjected to a complex environmental mix with various impurities present in the CO2 stream along with different phases within the well. Knowledge and understanding of corrosion and cracking performance of various materials in different environmental conditions relevant to CCS wells can provide a basis for material selection. Being a relatively new field there is an effort to build up knowledge base via testing, characterizing materials suitable for long term well service. In this study, martensitic, supermartensitic and super duplex stainless steels along with Age Hardenable (AH) Nickel Alloy were tested for both corrosion and cracking performance in different CCS type environments. The testing simulated exposure to injected fluid phase, interface between injected fluid and water phase and completely immersed in water phase. The details of testing performed results obtained along with discussions is presented so that it can provide guidance on material compatibility for some of the CCS environments.