Sulfate-reducing　Bacteria　(SRB)　corrosion　is　a　serious　threat　to　the　safety　of　marine　pipelines.To　reveal　the　influence　of　the　corrosion　behavior　of　X60　pipeline　steel　in　the　presence　of　SRB　cultured　in　seawater　and　mud　from　the　East　China　Sea　The　corrosion　behavior　of　X60　pipeline　steel　was　studied　with　weight　loss　measurements,　microstructure　and　membrane　composition　analysis,　electrochemical　measurements　The　corrosion　rate　in　sterile　seawater　is　0.11　mm/y,　whereas,　in　SRB-infested　seawater,　it　increases　by　245　%　to　0.38　mm/y.　In　sterile　sea　mud,　the　corrosion　rate　is　0.15　mm/y,　but　in　SRB-infested　sea　mud,　it　increases　by　87　%　to　0.28　mm/y.　In　the　corrosive　environment　of　seawater　and　mud　in　the　East　China　Sea,　SRB　significantly　accelerates　the　microbial　corrosion　of　X60　pipeline　steel.　These　findings　provide　theoretical　guidance　for　further　research　on　SRB　corrosion　mechanisms　and　corrosion　control　of　marine　pipelines.　©　2024　The　Authors