... 20#,16Mn;GB/T9711.1-1997;GB/T9711.2-1999: L245~L555;EN10217-1,EN10219-1,EN10224 L235,L275,L355 ... America Technique SAW welding UsagePiling projectheat-supply project 3. conveying drinking water,drainage,coal gas,fuel gas ... Bevelled or plain ends as per buyer's request,3. Marks: as per customer's request, 4. Surface ... properties analysis,Chemical composition testing API 5L 3 layer PE coated Steel Pipe