thin wall CDS seamless carbon steel pipe/Chinese specialized manufacturer

1. thin wall CDS seamless carbon steel pipe
2. Standard&material: DIN2391-2 ST52, EN10305-1 E355, C45E, 34CrMo4, 42CrMo4, ASTM A519 SAE1020, SAE1026, SAE1045, SAE4130, SAE4140, etc.
3. Size range: 50mm*40mm - 480mm*420mm
4. Manufacture method: Cold rolled, cold drawn
5. Treatment method of internal surface: Honed
6. Delivery condition: BK, BKW, BKS, GBK, NBK.
7. Tolerance of ID: H7, H8, H9, H10
8. Tolerance of W. T: +/-5%
9. Roughness of internal surface: 0.35um max.
10.Straightness of tubes: 0.5mm/1000mm, 0.8mm/1000mm, 1mm/1000mm according to length of tubes required.
11. Packing: In bundles tied with steel strips. Slightly internal&external oil coating for anti-rust protection. End plastic caps covering both ends.