... Specification of seamless steel pipe: ItemStandardGradeSize(mm)Length(mm)Low and medium pressure boiler tubeGB3087-200810,2010-530*2-404000-13500seamless pipe ... pipeGB/T17396-200920,35,45,27SiMn70-377*9-403000-13500High pressure boiler tubeGB5310-200820G,20MnG,25MnG,15MoG,20MoG,12CrMoG,15CrMoG,12Cr2MoG ...