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Contributors in Aluminum
Aluminum
Chatter mark
Metals; Aluminum
Numerous intermittent lines or grooves that are usually full width and perpendicular to the extrusion direction.
Arbour mark
Metals; Aluminum
Surface damage in the vicinity of a coil ID caused by contact with a roughened, damaged or non-circular arbour or by the end of the product.
Bearing mark
Metals; Aluminum
A depression in the extruded surface caused by a change in bearing length in the extrusion die.
Carbon mark
Metals; Aluminum
Grey or black surface marking caused by contact with carbon runout blocks.
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