| 摘要 |
<p>A method for improving the surface quality of electromagnetically cast aluminum alloy ingot (15) includes the addition of an effective amount of calcium prior to the ingot head (19) of an ingot mold (30) of an electromagnetic casting station (7). The addition of calcium is regulated such that the aluminum alloy cast ingot (15) contains a maximum of 0.05 weight percent calcium. Addition of the calcium prior to the ingot head (19) produces a cast ingot (15) which is generally free of surface imperfections (21) on side surfaces thereof so that the cast ingot (15) can be directly worked or rolled to a desired gauge without a scalping (29) or other surface conditioning treatment. The calcium can be added during melting, alloying, filtering, degassing or transferring of the molten aluminum prior to casting. An electromagnetically cast aluminum alloy ingot (15) is produced, preferably an AA 5182 can end stock alloy, which is essentially free of surface imperfections (21) to permit direct rolling or other working of the cast ingot without a surface conditioning treatment.</p> |
