eliminate the countermeasures
control incoming, are not allowed to scratch; adjust a mechanical part of the scratch. The
may be confused with mixed or long strips of iron oxide skin defect.
eliminate the countermeasures
passive roller bearings to regular fuel, does not work properly in a timely manner to replace; the height of the guides must be less than the rolling line; Roll Wrapper, straightening machine roller speed must be synchronized with the strip speedWorld Steel Pipe .
, hot dip galvanized eraser scratch the definition and appearance of
hot dip galvanized, there is a slight protuberance, feel; hot dip after scratch: The scratch the coating damage, linear brightness.
causes before
hot galvanized scratch: the raw materials to scratch; a mechanical and strip the relative motion between the open book to the zinc pot.
Hot dip galvanized after scratch: the relative motion to the take-up of a mechanical part of the galvanized steel in the zinc pot.
identify
naked eye or metallographic examination to determine.
May the misjudgment
may be confused with the surface oxide scale inclusions or subclass deficiency. Scratch:
name: rub scratches
1, the cold eraser scratch definition and appearance
and the rolling direction parallel and was linear, punctate, and there are many single trench or deep scratches . Can be generated in any part of the strip surface. Causes of
of
passive roll like transfer without transfer; under the guides above the rolling line; Roll Wrapper, straightening machine roller speed strip speed is not synchronized.