Metal treatment – Process of modifying or maintaining internal physical... – Magnetic materials
Patent
1979-05-11
1981-02-17
Rutledge, L. Dewayne
Metal treatment
Process of modifying or maintaining internal physical...
Magnetic materials
148111, 148 3155, 75123L, 75126R, H01F 100
Patent
active
042512956
ABSTRACT:
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.degree.-1000.degree. 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.degree.-1200.degree. C., annealing for 3-10 hours at 750.degree.-900.degree. C., cold-rolling with a 50-75% reduction, annealing for 3-10 hours at 750.degree.-900.degree. C., and cold-rolling with a 50-75% reduction to final thickness. The final annealing is performed for 24-72 hours at 800.degree. to 1000.degree. C.
REFERENCES:
patent: 1965559 (1934-07-01), Goss
patent: 3218202 (1965-11-01), Ganz
patent: 3849212 (1974-11-01), Thornburg
patent: 3892605 (1975-07-01), Thornburg
"Development of (110) [001] Texture in Low Alloy Iron by Primary Recrystallization and Normal Grain Growth," vol. 8A, Jan. 1977, Metallurgical Trans.
"Magnetic Properties of (110) [001] Oriented Low Alloy Iron," American Institute of Physics Conference Proceedings-21st Annual Conference-Philadelphia 1975.
Foster Karl
Rauch Gary C.
Thornburg Donald R.
Rutledge L. Dewayne
Sheehan John P.
Stoltz R. A.
Westinghouse Electric Corp.
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