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Steel tube processing defects

Steel tube processing defects are following belows:
1,Outside diameter tolerance: steel Outer over control standards than positive tolerance of foreign economic relations become large, become little more than a negative tolerance of foreign economic relations; tolerance of plus or minus tolerance of all, through the large oval.
2,Surface pitting: steel surface showing continuity pits.
3,External scarring: regular distribution pipe outer surface scars.
4,Green line: the outer surface of the steel pipe was presented symmetric or asymmetric linear bar marks.
5,Knock deflated: the outer pipe surface depressions, which raised a wall thickness of no damage.
6,Wall thickness tolerance: pipe wall thickness was straight, tube exceeds the tolerance range, mostly thin, occurred when the rack more.
7,Elbow: head or bend steel tube occurs in large cooling bed.
8,The appearance of scratches: straight outer surface of the pipe into the groove.

construction etc.





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