... header, steam pipe, heating pipeStructure PipeASTM A53/A106, GB8162A, B, 20#, 45#, Q345, 20Mn2, 42CrMoUsed for producing mechanical parts ... 27SiMn, 20CrMo4, 30CrMo4Mining machineryOil Cracking TubeASME SA213, GB9948T5, T9, 20#, 16Mn, 12CrMo, 15CrMoUsed in petroleum cracking furnaceChemical PipeGB647920#, 16Mn, ... 25max0.25max 16Mn(Q345B)0.12-0.200.20-0.551.20-1.600.035max0.035max0.25max0.25max0.25max ...