Metal treatment – Stock – Ferrous
Reexamination Certificate
2005-02-15
2005-02-15
Yee, Deborah (Department: 1742)
Metal treatment
Stock
Ferrous
C148S542000, C148S547000, C148S609000, C148S608000, C420S070000
Reexamination Certificate
active
06855213
ABSTRACT:
A ferritic non-ridging stainless steel and process therefor. A chromium alloyed steel melt containing sufficient titanium and nitrogen but a controlled amount of aluminum is cast into an ingot or continuously cast into a strip or a slab having an as-cast fine equiaxed grain structure substantially free of columnar grains. The as-cast steel contains 0.08% C, at least about 8% Cr, up to 1.50% Mn, <0.020% Al, ≦0.05% N, ≦1.5% Si, <2.0% Ni, Ti≧0.10%, the ratio of (Ti×N)/Al≧0.14, all percentages by weight, the balance Fe and residual elements. Preferably, the titanium is controlled so that (Ti/48)/[(C/12)+(N/14)]>1.5. A hot processed sheet may be formed from a continuously cast slab without grinding the surfaces of the slab. The hot processed sheet may be descaled, cold reduced to a final thickness and recrystallization annealed. Annealing the hot processed sheet prior to cold reduction is not required to obtain an annealed sheet essentially free of ridging and having high formability.
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McKague Alan R.
Yoshitake Eizo
Armco Inc.
Fillnow Larry A.
Yee Deborah
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