Abstract: Analyzed here in the paper are the mechanical properties, the chemical composition and the micro structure, etc. of the X65MOS steel plate and the Φ762 mm×22.2 mm SAWL weld pipe as made with the said plate both of which are produced by a certain domestic steel works. And both the physical and chemical properties of the said steel plate and weld pipe as to be used by a certain foreign user for low-temperature submarine service are studied so as to systematically grasp the manufacture ability of the said weld pipe. It is regarded via the analysis result that the said weld pipe as researched and developed has met applicable foreign technical requirements. Moreover the specimens of both the base metal and the weld show no cracks via the HIC test. Likely the weld proper also shows no cracks via the SSC test, which demonstrates that the steel weld pipe possesses good SSC resistance.