Cold Drawn Big Bore Thick Wall Seamless Precision Pre-honed Tubes/Chinese Manufacturer

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.
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