An Elementary Outline of Mechanical Processes Giving a Brief Account of the Mat
An Elementary Outline of Mechanical Processes Giving a Brief Account of the Mat
George Washington Danforth
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(3) The sudden chilling of the surface of a hot ingot, billet, bloom, or slab when it is taken from the mould or reheating fur- nace, causing small surface cracks called snakes. These cracks, when not too numerous nor too deep, are chipped from the surface before the material is rolled or forged, as their sides do not weld together when the metal is rolled. (4) Failure to discard enough of the ends of an ingot or a billet. (5) Squeezing metal in rolling so that fins press out between the rolls,... and subsequently rolling these fins down as laminations or hard streaks. (6) Not cleaning the mill scale from the upper surface in roll- ing plates, or other wide shapes, from which scale will not readily fall away due to the movements and jolting of the rolls. Further than the defects named, rolled products should not be crooked or warped, nor should plates show undue variation of thickness across their width nor along their length. 144 MECHAXICAL PROCESSES It is a common practice to keep a record of the identity of every ingot and billet cast, as in this way many defects in finished pro- ducts may be traced back to their causes.
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