... 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-fusion Welded Steel PipeSpiral Welded Steel Pipe ... ,T23,T91;Q235, Q195, Q345, 20#, A53(A,B), 10#, 16Mn, A106(B,C), 45#, API J55, API K55, St52, Q215 ...