Type: Seamless Grade: Gr.1, Gr.2, Gr.3, Gr.7, Gr.9, Gr.11, Gr.12 Sizes: Out Dia. 8-114mm Wall Thickness 0.5-4.5mm Length:not longer than12000mm Standard: ASTM,ASME Type: Seam-welded Grade: Gr.1, Gr.2, Gr.3, Gr.7, Gr.9, Gr.11, Gr.12 Sizes: Out Dia. 16-63 Wall Thickness 0.5-2.5 Length not longer than15000mm Standard: ASTM,ASME