Metal treatment – Process of modifying or maintaining internal physical... – Magnetic materials
Patent
1978-04-20
1979-09-11
Rutledge, L. Dewayne
Metal treatment
Process of modifying or maintaining internal physical...
Magnetic materials
148 16, 266251, 266252, 266257, H01F 104
Patent
active
041674260
ABSTRACT:
Individual charges of silicon steel are passed through a tunnel type furnace provided with charge and discharge vestibules. The annealing takes place in a hydrogen atmosphere and the vestibules are purged with nitrogen and then with hydrogen. The hydrogen used for purging is taken from the hydrogen in the annealing atmosphere and additional new hydrogen is added to the annealing atmosphere at the same time to maintain the pressure constant.
REFERENCES:
patent: 2955062 (1960-10-01), Cullen et al.
patent: 3606289 (1971-09-01), Bloom
patent: 3778221 (1973-12-01), Bloom
Robinson Philip R.
Snyder Ralph E.
Allegheny Ludlum Industries, Inc.
Dropkin Robert F.
Gioia Vincent G.
O'Rourke, Jr. William J.
Rutledge L. Dewayne
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