| 摘要 |
This is an ingot alloy composition and method suitable for making a low-alloy iron having desirable magnetic characteristics suitable for electrical applications such as transformers cores. The ingot alloy has relatively high (0.012-0.020%) sulfur and thus can be prepared with reduced melting cost (as compared to ingot alloys which are to have low sulfur content). To provide for good sulfur removal during processing, however, the manganese content of the ingot alloy must be kept very low (less than 0.01%, if the final annealing is to be performed at about (800 DEG -1000 DEG C.). The ingot alloy also contains 0.1-2% silicon, 0.1-2% chromium, 0.005-0.030% carbon, less than 0.004% oxygen and the balance essentially iron. The method provides for hot-rolling the above described ingot alloy at 900 DEG -1200 DEG C., annealing for 3-10 hours at 750 DEG -900 DEG C., cold-rolling with a 50-75% reduction, annealing for 3-10 hours at 750 DEG -900 DEG C., and cold-rolling with a 50-75% reduction to final thickness. The final annealing is performed for 24-72 hours at 800 DEG to 1000 DEG C.
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