Metal treatment – Compositions – Heat treating
Patent
1990-07-09
1992-01-07
Yee, Deborah
Metal treatment
Compositions
Heat treating
148111, C21D 802
Patent
active
050788086
ABSTRACT:
A process of producing regular grain oriented silicon steel having a final thickness of from 7 mils (0.18 mm) to about 18 mils (0.45 mm) including the steps of providing a silicon steel hot band, removing hot band scale, cold rolling to intermediate gauge without an anneal of the hot band, performing an intermediate anneal at a soak temperature of about 1650.degree. F. (900.degree. C.) to about 1700.degree. F. (9300.degree. C.), subjecting said annealed silicon steel to a first stage slow cooling at a rate of about 500.degree. F. (260.degree. C.) to about 1050.degree. F. (585.degree. C.) per minute down to about 1100.degree. F..+-.50.degree. F. (595.degree. C..+-.30.degree. C.), thereafter subjecting said silicon steel to a second stage fast cooling down to from about 600.degree.F. (315.degree. C.) to about 1000.degree. F. (540.degree. C.) at a cooling rate of from about 25.degree. F. (1390.degree. C.) to about 3500.degree. F. (1945.degree. C.) per minute followed by a water quench, cold rolling to final gauge, decarburizing, applying an annealing separator and final annealing.
REFERENCES:
patent: 3021237 (1962-02-01), Henke
patent: 4390378 (1983-06-01), Rastogi
Armco Inc.
Yee Deborah
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