In　order　to　prevent　stress　corrosion　in　petrochemical　facilities,　2205　duplex　stainless　steel　was　deposited　on　the　surface　contacted　with　the　corrosive　media　in　projects.　In　order　to　explore　the　application　scope　and　feasibility　of　the　solution,　two　welding　processes　(automatic　welding　and　manual　welding),　three　kinds　of　common　corrosion　environment　(saturated　hydrogen　sulfide,　magnesium　chloride,　calcium　chloride)　were　used　to　evaluate　its　stress　corrosion　comprehensively　at　the　constant　tensile　load　based　on　the　microanalysis　of　fracture,　and　the　mathematical　model　of　stress-life　was　established　based　on　the　experimental　results.　The　results　indicate　that　the　constant　tensile　load　threshold　is　0.45　ReL　for　automatic　welding　and　0.4　ReL　for　manual　welding　in　saturated　H2S　environment,　and　there　is　an　error　of　17%　between　them.　All　the　samples　are　good　after　96　hours　in　0.9　ReL　stress　test　with　the　calcium　chloride　environment,　which　shows　the　excellent　resistance　to　chloride　stress　corrosion.　But　the　coating　cannot　be　used　in　boiling　magnesium　chloride　environment.