Publisher's Synopsis
Excerpt from Preparation of Light Aluminum-Copper Casting Alloys
Magnesium also is sometimes found as an impurity in No. 12 alloy, it being occasionally added to heats. So-called No. 12 pig from miscellaneous scrap may differ greatly in composition when run down; besides copper, iron, and silicon it often contains considerable zinc and manganese, with magnesium in subordinate amounts. Zinc may run up to 5 per cent and more, and manganese may be present to the extent of per cent.
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