Metal treatment – Stock – Ferrous
Patent
1997-12-19
1999-02-09
Yee, Deborah
Metal treatment
Stock
Ferrous
148542, 148547, 148609, 148608, C21D 802, C22C 3828
Patent
active
058688757
ABSTRACT:
A ferritic non-ridging stainless steel and process therefor. A chromium alloyed steel melt is deoxidized with a sub-equilibrium amount of titanium and nitrogen and continuously cast into a strip or a slab or cast into an ingot having an as-cast fine equiaxed microstructure substantially free of columnar grains. The as-cast steel contains .ltoreq.0.010% Al, up to 0.08% C, 0.10-1.50% Mn, .ltoreq.0.05% N, .ltoreq.1.5% Si, 8-25% Cr, <2.0% Ni and is deoxidized with titanium, all percentages by weight, the balance Fe and residual elements. Preferably, the titanium is controlled so that formed from a continuously cast slab without surface grinding, may be descaled, cold reduced to a final thickness and recrystallization annealed. An anneal prior to cold reduction is not required to obtain an annealed sheet essentially free of ridging.
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McKague Alan R.
Yoshitake Eizo
Bunyard R. J.
Fillnow L. A.
Yee Deborah
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