SHINESTAR STEEL GROUP CO., LTD

盛仕达钢铁股份有限公司

Defects on the outer surface of hot rolled seamless tubes

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

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