... 45#, Q345, 20Mn2, 42CrMoUsed for producing mechanical parts and pipe fittingsHydraulic TubeGB1739635#, 45#, 27SiMn, 20CrMo4, 30CrMo4Mining machineryOil Cracking ... SA213, GB9948T5, T9, 20#, 16Mn, 12CrMo, 15CrMoUsed in petroleum cracking furnaceChemical PipeGB647920#, 16Mn, 12CrMo, 15CrMoHigh pressure chemical ... then finished to dimensional and wall thickness specifications in sizes from 1/8'' to 36'' OD ...