... ,JISB,GOST,etc 4)material:mild steel 5)API,ISO,CE,etc BG API carbon steel round head pipe TypeApplicationStandardMaterialalloy steel pipeit ... ,Corrosion resistanceASTM SA335 A335P22A335P5A335P9A335P91stainless steel pipeApplies to oil, aviation, metallurgy, food, water conservancy,electric power, chemical industry,Chemical, chemical fiber, pharmaceutical ...