... , XXS 3. Welding Type: 1) Seamless Steel Pipe, 2) Seamed/Welded Steel Pipe: ERW Steel Pipe, Spiral Steel Pipe 4. Material: Carbon Steel: ASTM A106 Gr. B, ASTM A53, Gr ... drawing 7. Surface Treatment: Polishing, Pickling, Antiseptic, Abrasive blasting, HDG, Black painting, Anti-rust varnish, Anti-rust oil, 3PE coating, Epoxy ...