cod drawn big bore seamless tube

        1. Standard&material: DIN2391-2 ST52, ST52.3, ASTM A106, API 5L

        2. Size range: 50mm*40mm - 480mm*420mm 

        3. Manufacture method: Cold rolled, cold drawn

        4. Treatment method of internal surface: Honed

        5. Delivery condition: BK, BKW, BKS, GBK, NBK.

        6. Tolerance of ID: H7, H8, H9, H10

        7. Tolerance of W. T: +/-5% 

        8. Roughness of internal surface: 0.35um max.

        9. Straightness of tubes: 0.5mm/1000mm, 0.8mm/1000mm, 1mm/1000mm according to     length of tubes required. 

       10. Packing: In bundles tied with steel strips. Slightly internal&external oil coating for anti-rust  protection. End plastic caps covering both ends.