Splee
Dead characteristics: Show irregular or regular local indentation and meat on the longitudinal surface of the steel pipe. The shapes are nuclear, strip, horizontal pressure injuries, tilted skin, fragmented, iron dumb -shaped, etc.
cause:
① The surface of the finished rack rolls of the tensor is sticky on the surface of the roller.
② Scars or other foreign bodies are pressed on the surface of the steel pipe to fall off.
③ The thermal steel pipe is injured or scratched.
④ Trocaying injuries and printed by the transverse movement or sawing device.
judge:
General tube: Wall thickness ≤8mm indentation depth does not exceed 90% of negative deviations, and wall thickness> 80% of 80% of the depth of 8mmm indentation shall not exceed 1.0mm.
Boiler tube: The maximum value of the wall thickness is 0.6mm.
Oil suite: The indentation depth must not exceed half of the wall thickness bias. The maximum value of the depth at the S≥10mm does not exceed 0.6mm, and the maximum depth of the maximum of S <<10mm does not exceed 0.5mm.
