... GR1 Steel Pipe MaterialCarbon Steel, Stainless Steel, Alloy Steel, Nickel Alloy Steel, Duplex Steel and Super Duplex SteelSteel Pipe TypeSeamless Steel Pipe, Welded Steel Pipe, LSAW, SSAW, Galvanized Steel Pipe, Electric-resistance Welded Steel Pipe, Electric ... ,T91;Q235, Q195, Q345, 20#, A53(A,B), 10#, 16Mn, A106(B,C), 45#, API J55, API K55, St52, Q215, API ...