A raised spot on only one surface of the metal whose origin is between the cladding and core in clad products. Bond blisters are caused by expansion of gas from a localized incomplete bond.
A raised spot on the surface (one or both sides) of rolled metal. Core blisters, caused by expansion of gas contained in the core of the product, have a detrimental effect on mechanical and physical properties.
A thin ridge of roughness left by a cutting operation such as slitting, trimming, shearing, blanking or sawing.
CORROSION, WATER STAIN—
(Condensation Stain, Water Stain) Superficial oxidation of the surface with a water film in the absence of circulating air, held between closely adjacent metal surfaces such as between wraps of a coil or sheets of a stack. The appearance varies from iridescent in mild cases to white, gray, or black in more severe instances.
(Broken Surface, Cross Hatching, Reticulation,Transverse Cracks) A macroscopic effect of numerous surface tears, transverse to the rolling direction, which can occur when the entry angle into the cold mill work rolls is large.