Defects on the outer surface of hot rolled seamless tubes
External folding: The outer surface of the pipe presents a layered folding spiral.
Separation: layered and cracked in a spiral or block shape.
External scars: There are scars on the outer surface.
Hemp surface: uneven pits appear on the steel surface.
Line: Basically symmetric or asymmetric linear scroll mark.
Hairline: continuous or discontinuous hairline.
Net cracks: small scaly cracks.
Scratches: linear or spiral groove-like defects.
Contact deflation: the outer surface of the steel pipe shows a convex and concave phenomenon, and the thickness of the pipe wall is not damaged.
Bruise: collision with irregular scars.
Straightening groove: the outer surface of steel spiral groove.
Roll-off: The longitudinal or local long-term convex and concave folds, the outer surface into a strip-shaped depression.
Cracks: Phenomenon of opening the cracked surface, which is produced in large quantities in thin-walled tubes.
Post time: Jul-08-2020