Stress corrosion cracking (SCC) susceptibility of a high strength low alloy tempered martensite tubular steel were evaluated at different temperatures from 25-175 °C and CO2 partial pressures from 500-3000 kPa in carbonate-bicarbonate environment. Constant extension rate tests coupled with a high temperature/high pressure autoclave were used. Results revealed the occurrence of SCC at temperature from 100-175 °C and CO2 partial pressure from 500-1500 kPa. However at CO2 partial pressures greater than 1500 kPa uniform corrosion was observed without cracking. Corrosion products and cracks distribution were analyzed by X-ray photoelectron spectroscopy X-ray diffraction and scanning electron microscopy. The occurrence of SCC was attributed to the formation of protective corrosion products mainly iron carbonate layer on the surface. Moreover delineation of the prior austenite grain boundaries (GBs) indicated that the majority of SCCs propagated through GBs.