... )API,ISO,CE,etc BG API carbon steel round head pipe TypeApplicationStandardMaterialalloy steel pipeit is used in petroleum,chemical ... A335P22A335P5A335P9A335P91stainless steel pipeApplies to oil, aviation, metallurgy, food, water conservancy,electric power, chemical industry,Chemical, chemical fiber, pharmaceutical ... industry in order to transmit the he oxygen,water and oilAPI 5LA,B,X42,X46,X52,X56, ...