連続焼鈍による超深絞り用冷延鋼板の製造

概要

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The Ti-stabilized steel has a uniform distribution of very fine precipitates (TiC) already in the hot rolled state. These prior precipitates are effective in developing a strong {111} recrystallization texture on annealing after cold rolling, and the slow heating up to annealing temperature such as undertaken for Al-killed steel to get effective precipitates or pre-precipitation clusters is not necessary for Ti-stabilized steel. Lowering carbon content of the steel to less than 0.01% results in great increases of the grain size and r^^- value in a very short time with the raising annealing temperature. The Ti-stabilized very low carbon steel (e.g., 0.005%C-0.1%Ti) therefore can get a very high r^^- value of above 2.0 even by applying a rapid annealing cycle with heating rates of 10^4 to 10^5℃/sec and with soaking times within a few minutes. Quench-aging does not occur at all in Ti-stabilized steel rapidly cooled from annealing temperature, as the carbon (and nitrogen) in the steel is stabilized with titanium. Then continuous-annealed Ti-stabilized steel is non-aging and very soft without over-aging treatment. The Ti-stabilized very low carbon steels is the most suitable to get a non-aging steel sheet having an extra deep drawing quality by the continuous annealing process.
社団法人日本鉄鋼協会の論文
1975-04-01