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Delta Metal.
Оглавление—An alloy widely used for making parts of machinery, and also for artistic purposes, is the so-called Delta metal. This is a variety of brass hardened with iron; some manufacturers add small quantities of tin and lead; also, in some cases, nickel. The following analysis of Delta metal (from the factory at Düsseldorf) will show its usual composition:
| I | II | III | IV | V | |
|---|---|---|---|---|---|
| Copper | 55.94 | 55.80 | 55.82 | 54.22 | 58.65 |
| Zinc | 41.61 | 40.07 | 41.41 | 42.25 | 38.95 |
| Lead | 0.72 | 1.82 | 0.76 | 1.10 | 0.67 |
| Iron | 0.87 | 1.28 | 0.86 | 0.99 | 1.62 |
| Manganese | 0.81 | 0.96 | 1.38 | 1.09 | — |
| Nickel | traces. | traces. | 0.06 | 0.16 | 0.11 |
| Phosphorus | 0.013 | 0.011 | traces. | 0.02 | — |
I is cast, II hammered, III rolled, and IV hot-stamped metal. Delta metal is produced by heating zinc very strongly in crucibles (to about 1600° F.), and adding ferromanganese or “spiegeleisen,” producing an alloy of 95 per cent zinc and 5 per cent of iron. Copper and brass and a very small amount of copper phosphate are also added. {64}
