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Disadvantage of steel pipe

Disadvantages of steel pipe in production are following bellows:
Outside diameter tolerance
Foreign economic control standards than steel, more than the positive tolerance become big foreign economic relations, foreign economic relations than negative tolerances become smaller; a tolerance of plus or minus all the ultra-poor, through the large oval

Dimples
Steel surface showed continuity pits

External scarring
Scar regular distribution of steel outer faces

Green Line
The outer surface of the pipe was rendered symmetrical or asymmetrical linear bar marks

Knock deflated
The outer pipe surface depressions, which projections, no damage to the wall thickness

Wall thickness tolerance
Linear type pipe wall thickness, tube exceeds the tolerance range, mostly thin, occurs when the rack more

Bend
Steel tube bending occurs in the head or large cooling bed

Appearance of scratches
The outer surface of the pipe into a straight groove

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