1. Commodity: DIN1629 ST52-3 seamless honed tube2. Standard&material: DIN1629, DIN2391 ST52-33. Size range: 30mm(ID)*3mm(W. T) - 400mm(ID) * 40mm(W. T)4. Manufacture process: Cold-drawn5. Delivery condition: Cold-drawn/hard, cold-drawn/soft. Heat-treated tubes can be negotiated for production&supply.6. Roughness of internal surface: 0.125um -0.4um7. Straightness: 0.3/10008. Size tolerance: (see table)9. Packing: To be confirmed. Stadnard packing: In bundles tied with steel strips.10. Marking, oil-coating, varnish, black painting, end-protection to be confirmed.1. Heat-treating of tubes like annealing, normalizing, stress-relieving can be negotiated for supply.2. Tubes with other materials like ST52.4 can be negotiated for supply.Designation Allowed roughness of internal surfaceA b c d e fNominated value 0.125um 0.2um 0.4um 0.8um 1.6um 3.2um1. Tolerance can be +25%/-02. Roughness of internal surface of cold-drawn seamless tubes should reach " f", 3.2um-4um
