Grain-oriented silicon steel sheet and process for production thereof
AssigneeKawasaki Steel Corporation
InventorsHiroaki Toda, Kunihiro Senda, Mitsumasa Kurosawa, Makoto Watanabe, Atsuhito Honda
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Abstract
Grain-oriented silicon steel sheet with Bi as an auxiliary inhibitor and a forsterite coating film having a Cr spinel oxide subscale of FeCr2O4 or FexMn1-xCr2O4 (0.6≦x≦1), made from a steel slab containing 0.005-0.20 wt % of Bi and 0.1-1.0 wt % of Cr.
Claims4
A grain-oriented silicon steel containing Cr and Bi as steel constituents and having a forsterite coating on its surface,
- wherein said steel and said forsterite coating combined together contain about C≦30 wtppm, Si:
- 2.0-4.5 wt %, Al:
- 0.005-0.03 wt %, N:
- 0.0015-0.006 wt %, Mn:
- 0.02-0.5 wt %, Cr:
- 0.1-1.0 wt %, and Bi:
- 0.001-0.15 wt %, and wherein the steel sheet has a magnetic flux density of B8≧1.96T.
A decarburization annealed silicon steel sheet having a chromium spinel sub-scale, wherein said sheet and sub-scale comprise about C≦30 wtppm, Si:
- 2.0-4.5 wt %, Al:
- 0.01-0.05 wt %, N:
- 0.003-0.012 wt %, Mn:
- 0.02-0.5 wt %, Cr:
- 0.1-1.0 wt %, and Bi:
- 0.005-0.20 wt %.
The steel sheet defined in cliam 2, wherein said subscale comprises 0.35 -0.95 g/m3 of oxygen.
Dependencies are inferred from the claim text.