Metal treatment – Process of modifying or maintaining internal physical... – Magnetic materials
Reexamination Certificate
2006-05-19
2010-12-28
Sheehan, John P (Department: 1793)
Metal treatment
Process of modifying or maintaining internal physical...
Magnetic materials
C148S308000
Reexamination Certificate
active
07857915
ABSTRACT:
Reheating a grain-oriented electrical steel sheet slab comprising predetermined components to 1280° C. or more and a solid solution temperature of inhibitor substances or more, hot rolling, annealing, and cold rolling it, decarburization annealing it, nitriding it in a strip running state, coating an annealing separator, and finish annealing it during which making a precipitation ratio of N as AlN after hot rolling 20% or less, making a mean grain size of primary recrystallization 7 μm to less than 20 μm, and making a nitrogen increase ΔN in the nitridation within a range of Equation (1) and making nitrogen contents σN1and σN2(front and back, mass %) of a 20% thickness portion of one surface of the steel strip (sheet) within a range of Equation (2):in-line-formulae description="In-line Formulae" end="lead"?0.007−([N]−14/48×[Ti])≦ΔN≦[solAl]×14/27−([N]−14/48×[Ti])+0.0025 Equation (1)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?|σN1−σN2|/ΔN≦0.35 Equation (2).in-line-formulae description="In-line Formulae" end="tail"?
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Kumano Tomoji
Murakami Ken-ichi
Ushigami Yoshiyuki
Kenyon & Kenyon LLP
Nippon Steel Corporation
Sheehan John P
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