Process:Sprial Submerged-Arc Welded Steel Pipe Usage:Used for low pressure liquid delivery, such as water, gas, and oil.piling, etc. Standard:API 5L,API 5CT,ASTM A53,ASTM A252,EN10217,EN10219,DIN,JIS,BS Certificate:API 5L ISO CE Our diameter:219.1mm-3040mm(8-120 inch) Wall Thickness:5 -30mm Length:4-22m Steel Grade:API 5L GR.B,X42,X46,X56,X65,X70 ASTM A53 GRADE A,GRADE B EN:S275,S275JR,S355JRH, ...