... 80mm 3) Manufacturing standards: GB, 4) seamless steel pipe -product name-main material-standard-usessize range(mm)stainless steel pipe 0Cr18Ni9 (304),00Cr19Ni10 (304L),00Cr17Ni14MO2 ... 14976-2002GB/T 14975-2002 -Decorative Stainless Steel 4-426×1-40 Structural Pipe 10,20,35,45,Q23516Mn Q345BGB/T8162-2008 ... - tube for boilers and overheating14-426*1.5-4.5 line pipe 5L GR.B, X52,X60 API-for petroleum, ...