C - Chemistry – Metallurgy – 22 – C
Patent
C - Chemistry, Metallurgy
22
C
C22C 38/28 (2006.01) C21D 8/02 (2006.01) C22C 1/02 (2006.01) C22C 38/18 (2006.01) C22C 38/50 (2006.01)
Patent
CA 2254564
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 x 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.
Mckague Alan R.
Yoshitake Eizo
Armco Inc.
Riches Mckenzie & Herbert Llp
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