... Steel PipeSpiral Welded Steel Pipe, Hot-rolling Seamless Pipe, Cold-rolling Seamless PipeStandardASTM, DIN, GB, BS, JIS, ASME, API, AISI,, ANSIGradeA106 GR B,A53GR B , API 5L GR B ... ,T22,T23,T91;Q235, Q195, Q345, 20#, A53(A,B), 10#, 16Mn, A106(B,C), 45#, API J55, API K55, St52, Q215, API ...