... , STD, XS, 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 ... , BS, EN, GB, API 6. Productive Technology: Hoe rolling, Cold rolling, Cold drawing 7. Surface Treatment: Polishing, Pickling, Antiseptic, Abrasive blasting, HDG ...