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The defect of the outer surface and inner face of the hot expanded seamless pipe

Views:1     Author:Site Editor     Publish Time: 2021-12-10      Origin:Site

What is the defect in outer surface of the hot expanded seamless pipe?

1. An outer fold: the outer surface of the pipe presents a layered folded spiral.

2. separation: presenting a spiral shape or blocky delamination and cracking.

3. external scarring: scars on the outer surface.

4. pock surface: steel surface showed uneven pits.

5. Line: a substantially symmetrical or asymmetrical linear rolling marks.

6. Hairline: a continuous or discontinuous hairy fine lines.

7. net cracks: scaly small cracks.

8. scratches: linear or spiral-shaped groove-like defects.

9. touch deflated: the outer surface of the steel pipe rendered in a convex outer concave phenomenon, and pipe wall thickness without injury.

10. bumps: collision irregular scars.

11. straightening recess: steel spiral concave outer surface.

12. rolled off: longitudinally local or long presentation in a convex outer concave folds, the outer surface into strips depression.

13. crack:opened the rupture surface phenomenon, much produced in the thin-walled tube.


What is the defect in inner surface of the hot expanded seamless pipe?

1. An inner flap: presenting a straight line, a spiral or a semi-helical sawtooth defect on the inner surface of the steel pipe.

2. Inside scarring: scars in the steel pipe inner surface, generally easily peel off.

3. Warping: a straight line or intermittent small nail-like tilt leather. Often seen in the capillary head, and easy to peel.

4. Inside straights: a straight shape scratch with a certain width and depth.

5. Inner edge: a straight shape protrusion with a certain width and depth.

6. Inner drum kits: a super and regular protrusion and outer surface is not damaged.

7. Pull pits: a regular or non-regular pit and the outer surface without damage.

8. Internal thread (this defect produced only at Accel units): spiral traces often seen in the thin-walled tube surface, and there are obvious rugged feelings.