Depended on the product.
You have the wire rod which is coiled. On this wire you have rests of the rolling emulsion. The phenomenon is seen both on coils as rolled as when annealed where you burn off (a part) of the emulsion.
The phenomenon is also noticed on drawn wire were the wire is...
Hi all,
We are producing Al wires and are transporting them as coils and on drums. Sometimes the wire gets superficially damaged on the contact points of neighbouring Al wire. At these contact areas a black dust is found.
I believed this is caused by a form of fretting?
Can the black powder...
